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Installation & Operation Manual
Boiler Control 284
Multi-Staging
A Flexible Solution for Commercial & Multi-Residential Heating Plants
D 284
08/14
Replaces: 04/14
The Boiler Control 284 is designed to operate up to four
boilers to accurately maintain a target water temperature.
The 284 operates both condensing & non-condensing boilers
that are either modulating, single stage or two stage to
provide a flexible, cost effective mixed boiler plant solution
with better system performance.
The target water temperature is based on outdoor temperature
reset or a fixed setpoint for space or process heating
applications. Additional loads supplied by the 284 include
domestic hot water & fixed setpoint heating. Boiler equal
run-time rotation, stand-by primary pump operation & pump
exercising all increase boiler plant reliability.
The 284 communicates with a Building Automation System
(BAS) using BACnet® IP or Modbus® for remote monitoring
& adjustment capability. tekmarNet® Thermostats or a tN4
Gateway 483 can be added to optimize system performance
& provide remote monitoring capability.
Features
•
Outdoor temperature reset
•
Programmable schedules
•
tekmarNet
•
Control up to four boilers
•
Condensing & non-condensing boiler groups
•
Modulating, single stage or two stage
•
Boiler isolation valves
•
BACnet
•
Primary pump sequencing
•
DHW priority
•
Setpoint operation
•
Combustion air damper control
•
Energy, flow & pressure monitoring
®
compatible
®
IP or Modbus® communication
A Watts Water Technologies Company
BACnet is a registered trademark of ASHRAE.
ASHRAE does not endorse, approve or test products
for compliance with ASHRAE standards. Compliance of
listed products to the requirements of ASHRAE Standard
135 is the responsibility of BACnet International (BI).
BTL is a registered trademark of BI.
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Benefi ts
•
Reduce energy costs
•
Prolong equipment life
•
Provide boiler redundancy
•
Provide primary pump redundancy
•
Remote monitoring & adjustment options
•
Combine mid & high efficiency boilers to lower
component cost
© 2014 284_D - 08/14
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Table of Contents
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Sequence of Operation .....................................................2
Boiler Setup ................................................................... 2
System Setup ................................................................ 5
Boiler Plant Operation ................................................... 7
Outdoor Temperature Reset Operation ...................... 10
Setpoint Operation ...................................................... 12
Energy Management System (EMS) Operation .......... 13
Indirect Domestic Hot Water (IDHW) Operation ..........14
Dedicated Domestic Hot Water (DDHW) Operation ....17
Building Automation System (BAS) Operation .............17
Pump Operation .......................................................... 18
C.A. Damper & DHW Recirculation ............................. 20
Setting the Schedule ................................................... 20
Time Clock ................................................................... 21
tekmarNet
Installation .......................................................................22
Installation Location ..................................................... 22
Control Wiring .............................................................. 23
Sensor Installation & Wiring ........................................ 26
EMS, Modbus
Wiring the tekmarNet
Testing the Sensor Wiring ...........................................30
®
4 Communication ...................................... 21
®
& BACnet® Connections ....................29
®
Devices ................................... 30
Testing the Control Wiring ............................................... 31
Control Settings ...............................................................33
Access Level ............................................................... 33
DIP Switch Settings ..................................................... 33
User Interface ..................................................................34
Display & Symbols....................................................... 34
Navigating the Display ................................................. 35
View Menu .................................................................. 35
Setup Menu ................................................................ 37
Source # Menu ............................................................43
BAS Menu .................................................................... 45
Monitor # Menu ............................................................ 47
Monitor Menu .............................................................. 48
Time Menu ................................................................. 50
Schedule Menu ...........................................................51
Toolbox Menu .............................................................52
Manual Override ......................................................... 54
Troubleshoot ing ...............................................................56
Error Messages ..........................................................56
Technical Data ............................................................60
Limited Warranty & Product Return Procedure...............60
Sequence of Operation
Boiler (Source (#) Menu) Setup & Operation
The 284 is able to operate up to four boilers as a heat source.
Each boiler is independently configured allowing for maximum
plant flexibility.
Boiler Enable
This setting selects whether the boiler is operational or not.
OFF
The boiler is disabled & will not be included in the plant
operation.
AUTO
The boiler is enabled & will be included in the plant
operation.
Copy Boiler 1
Many boiler installations will have multiple identical boilers.
To reduce the number of settings required, certain settings
of boiler 1 are copied to boiler 2 by setting the Boiler 2 Copy
setting to Boil1. Copy settings are also available for boiler 3
& boiler 4.
OFF
The settings from boiler 1 are not copied. This allows for
individual boiler settings.
Boil 1
The settings from boiler 1 are copied.
Condensing
This setting selects whether the boiler is condensing or noncondensing & defines what boiler group it is part of.
NO
The boiler is non-condensing & is part of the non-condensing
boiler group.
YES
The boiler is condensing & is part of the condensing boiler group.
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Boiler Type
The 284 has four different boiler types to choose from. Use
the Boil TYPE setting to select one of the following:
MOD
The modulating output operates a modulating boiler by controlling
the burner firing rate. The Stage 1 relay is also used to give
a boiler enable to allow the modulating boiler to go through
ignition sequence. The Stage 1 relay may not be required on
all modulating boilers.
1STG
The Stage 1 relay operates a single, stage boiler by cycling
the burner stage on & off.
2STG
The Stage 1 & Stage 2 relays operate a single, two stage boiler
by cycling the burner stages on & off.
EMS
The modulating output operates a boiler that interprets an
analog input signal as a target temperature. The temperature
rails (minimum and maximum) are adjustable between 50°F
(10.0°C) & 210°F (99.0°C).
VDC SIGN MIN
•
Sets the minimum analog Vdc signal which corresponds to
the minimum temperature (EMS TEMP MIN).
EMS TEMP MIN
•
Sets the temperature on the low end which corresponds to the
minimum analog signal (Vdc Min / 4 mA).
EMS TEMP MAX
•
Sets the temperature on the high end which corresponds to
the maximum analog signal (10 Vdc / 20 mA).
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Modulating Type
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The MOD TYPE setting selects the analog output signal used
for modulating (MOD) and EMS boiler types.
0-10
The modulating output is 0-10 V (dc).
4-20
The modulating output is 4-20 mA.
The 4-20 mA output can be converted to a 0 - 135 Ω output
using a 0 - 135 Ω Converter 005. Refer to the Modulating Boiler
Wiring section of the Control Wiring section.
Fire Delay
The Fire Delay sets the time it takes for the boiler to
generate flame from the time the boiler turns on.
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---------------------------------
can be set. This allows the control to properly operate the
boilers using either sequential or parallel modulation. Each
boiler typically has a rating plate that specifies the minimum
& maximum output. This information is also available in the
boiler manual.
The minimum & maximum boiler output is expressed in MBtu/h.
1 MBtu/h = 1,000 Btu / hour. The range is from 10 MBtu/h to
9,990 MBtu/h.
For example, if a boiler has a maximum output of 100,000
Btu / hr & a minimum output of 20,000 Btu / hr (turn down
ratio of 5):
Maximum Boiler Output = 100,000 = 100 MBtu/h
1,000
Boiler Contact Closed
Fire Delay
Burner On
Time
Modulation Delay
The MOD DELAY is the time that the boiler burner must hold
the modulation of the boiler at a minimum before allowing it to
modulate any further.
Boiler Mass
The Boil MASS setting selects the thermal mass characteristics
of each boiler. Operation of the boiler can become unstable if the
incorrect Boiler Mass setting is chosen. A key sign of unstable
boiler operation is that the flame will continue to increase & then
decrease in short periods of time. By choosing a lower boiler
mass setting, the boiler response will become more stable.
LOW
The LO setting is selected if the boiler that is used has a low
thermal mass. This means that the boiler has very small water
content & has very little metal in the heat exchanger. A boiler that
has a low thermal mass comes up to temperature quite rapidly
when fired. This is typical of many copper fin-tube boilers.
The Low mass setting (LO) provides a fast response to the
heating system.
MED
The MED setting is selected if the boiler that is used has a
medium thermal mass. This means that the boiler either has
a large water content & a low metal content or a low water
content & a high metal content. This is typical of many modern
residential cast iron boilers or steel tube boilers.
The Med mass setting provides a moderate response to the
heating system.
HI
The HI setting is selected if the boiler that is used has a high
thermal mass. This means that the boiler has both large water
content & a large metal content. A boiler that has a high thermal
mass is relatively slow in coming up to temperature. This is
typical of many commercial cast iron & steel tube boilers.
The Hi mass setting provides a slow response to the heating
system.
Low Fire & High Fire Boiler Output
In order to accommodate different boiler capacities in the
same system, a low fire & high fire boiler output for each boiler
A Watts Water Technologies Company
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Minimum Boiler Output = 20,000 = 20 MBtu/h
1,000
Motor Speed
The MOTOR SPD is the amount of time the boiler requires to
go from 0% modulation to 100% modulation.
Gas valve actuating motors have a design time from fully
closed to fully opened which can be found in the manufacturer’s
manual. The Motor Speed should be set to this time.
The Motor Speed setting for a Variable Frequency Drive (VFD)
is the amount of time required to go from a stopped position
to 100% fan speed. Since a VFD has a very quick response
rate, it may be necessary to increase the Motor Speed setting
in order to increase the stability of the boiler modulation.
Start Modulation
The START MOD setting is the lowest modulation output required
to obtain proper ignition. Whenever boiler operation is required,
the control outputs an analog signal corresponding to the Start
Modulation setting & closes the boiler contact to turn on the
burner. After the Fire Delay has elapsed & the burner is ignited,
the control modulates the firing rate between the Minimum
Modulation setting & the Maximum Modulation setting.
Minimum Modulation
The MIN MOD is the lowest signal the control can send to
modulate the boiler. This operates the boiler at low fire. Use the
MIN MOD setting in the Adjust Menu to select an appropriate
boiler minimum modulation.
Refer to the boiler manufacturer’s literature to determine
•
the minimum output voltage V (dc) or current (mA) that the
boiler will successfully operate at.
For 0 to 10 V (dc):
Minimum Modulation =
Boiler’s Minimum Input Signal
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OR
---------------------------------
---------------------------------------------
x 100%
10 V (dc)
For 4 to 20 mA:
Minimum Modulation =
Boiler’s Minimum Input Signal - 4mA
x 100%
16 mA
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Example:
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A boiler requires a 1.8 V (dc) signal to fire the boiler at low fire.
The boiler can be modulated to 10 V (dc) where it reaches
high fire.
Minimum Modulation = 1.8 V x 100% = 18%
10 V
10 V (dc)
Control’s
Output
Signal
Range
Minimum
Modulation
0 V (dc)
Maximum Modulation
100%
88%
18%
0%
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10 V (dc)
Boiler’s
Input
Signal
Range
1.8 V (dc)
Boiler’s
Minimum
Input
Signal
The Maximum Modulation is the highest signal the control
can send to modulate the boiler. For boilers with electronic
operators, the boiler’s input signal range may not match the
output signal range of the 284. Use the MAX MOD setting in
the Source (#) Menu to select an appropriate boiler maximum
modulation.
For 0 to 10 V (dc):
Maximum Modulation =
Boiler’s Maximum Input Signal
x 100%
10 V (dc)
Maximum Boiler Outlet
---------------------------
The control has the capability for each boiler outlet temperature
to be monitored & limited. The MAX OUT setting sets the
maximum boiler outlet temperature. For modulating boilers,
as the boiler outlet temperature approaches the boiler outlet
maximum temperature, the control will reduce the firing rate.
Once the boiler outlet temperature reaches the boiler outlet
maximum temperature less 15°F (8.0°C), firing rate reduction
will begin. Once the boiler outlet temperature reaches the boiler
outlet maximum temperature less 5°F (2.5°C), the firing rate
will be reduced to minimum modulation. If the boiler outlet
temperature reaches the boiler outlet maximum, the boiler is
turned off. In order for the boiler to be able to be turned back
on again, the boiler outlet temperature must drop 5°F (2.5°C)
below the boiler outlet maximum.
If MAX OUT is set to OFF, the control only monitors the boiler
outlet temperature.
Boiler Pump / Valve Post Purge
-----------------------------
This setting sets the amount of time the control operates the
boiler pump / valve after the boiler is turned off. This will purge
heat out of the boiler, reducing stand-by losses, & also aid in
reducing “kettling”. The amount of time for the boiler pump post
purge is adjustable between 10 seconds & 20:00 minutes. Auto
is also available in which the control automatically determines
the amount of time based on the boiler mass.
For 4 to 20 mA:
Maximum Modulation =
Boiler’s Maximum Input Signal - 4mA
x 100%
16 mA
Example:
A boiler’s input signal range is 0 to 9 V (dc). The 284 control
has an output signal range of 0 to 10 V (dc).
Maximum Modulation = 9 V x 100% = 90%
10 V
10 V (dc)
Maximum
Modulation
Control’s
Output
Signal
Range
100%
90%
0%
9 V (dc)
Boiler’s
Input
Signal
Range
0 V (dc)0 V (dc)
Boiler’s
Maximum
Input
Signal
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System Setup & Operation
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Application Mode
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There are five possible application modes that the 284 can be
configured for including:
Outdoor Temperature Reset (RSET)
•
Fixed Setpoint (SETP)
•
Dedicated Domestic Hot Water (DDHW)
•
Energy Management System (EMS)
•
Building Automation System (BAS)
•
Refer to the appropriate section of this brochure for a description
of the each of the application modes.
Boiler Minimum
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The Boil MIN is the lowest temperature that the control is allowed
to use as a boiler target temperature. During mild conditions, if
the control calculates a boiler target temperature that is below
the boiler minimum setting, the boiler target temperature is
adjusted to at least the boiler minimum setting. MIN is displayed
in the status field while viewing the boiler supply or target &
when the boiler target is boiler minimum & the boiler supply
is less than boiler minimum plus 5°F (2.5°C). Set the Boiler
Minimum setting to the boiler manufacturer’s recommended
temperature.
The Boil MIN is only applicable when at least one of the
boilers is configured for non-condensing.
Boil MIN + 5°F (2.5°C)
Boiler Differential
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Boiler Maximum
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Boil MIN
The Boil MAX is the highest temperature that the control is
allowed to use as a boiler target temperature. MAX is displayed
in the status field viewing the boiler supply or target & when the
boiler target is boiler maximum & the boiler supply is greater
than boiler maximum minus 5°F (2.5°C). Set the boiler maximum
setting below the boiler operator or aquastat temperature.
B
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Boiler Differential
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MAX
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Boil MAX
Boil MAX – 5°F (2.5°C)
Boiler Differential
Both on/off (single stage & two stage) & modulating boilers are
operated with a differential. In some cases, a modulating boiler
must be operated with a differential at low fire. This indicates
the load is smaller than the minimum modulation of the boiler.
For modulating boilers, the differential no longer applies once
operating the boiler above low fire.
The differential operates by turning on the boiler when the
boiler supply water temperature is 1/2 of the differential below
the boiler target temperature. As the boiler supply water
temperature reaches 1/2 of the differential above the boiler
target temperature, the boiler is shut off.
A Watts Water Technologies Company
Manual Differential
Differential = 10°F (6°C)
165°F (74°C)
160°F (71°C)
155°F (68°C)
Boiler
On
Boiler
On
Target + 1/2 Differential
Target – 1/2 Differential
Automatic Differential
Off
Exercising
Differential
Time
----------------------------------------
On
The control will exercise all pumps, & tN4 zones (zone valves
& zone pumps) for 10 seconds every three days of inactivity
to prevent seizure. To enable exercising, switch the Exercise
/ Off DIP to the Exercise position.
Boost
--------------------------------------------
When the control changes from the UnOccupied mode to the
Occupied mode, it enters into a boosting mode. In this mode,
the supply water temperature to the system is raised above its
normal values for a period of time to provide a faster recovery
from the setback temperature of the building. The maximum
length of the boost is selected using the BOOST setting in
the Setup menu.
Typical settings for the boost function vary between 30 minutes
& two hours for buildings that have a fast responding heating
system. For buildings that have a slow responding heating
system, a setting between four hours & eight hours is typical.
After a boost time is selected, the setback timer must be
adjusted to come out of setback some time in advance of the
desired occupied time. This time in advance is normally the
same as the BOOST setting.
If the building is not up to temperature at the correct time, the
BOOST setting should be lengthened & the setback timer should
be adjusted accordingly. If the building is up to temperature before
the required time, the BOOST setting should be shortened &
the setback timer should be adjusted accordingly. If the system
is operating near its design conditions or if the supply water
temperature is being limited by settings made in the control,
the time required to bring the building up to temperature may
be longer than expected.
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Target
Heating Load
Page 6
Flow Monitoring
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The control has the capability to monitor flow rate through the
connection of a 4-20 mA style flow sensor. Flow is measured in
either gallons per minute (gpm) or meters cubed per hour (m3/h).
The units are adjustable through the FLOW UNIT setting in the
Toolbox menu.
Varying flow rates are accommodated & the flow range of the
flow sensor being used is configured using the following items
in the Setup menu:
FLOW RATE 4 mA
•
Sets the flow rate on the low end which corresponds to
4 mA.
•
FLOW RATE 20 mA
Sets the flow rate on the high end which corresponds to
20mA.
Examples of compatible aftermarket flow sensors include the
Kele SDI series, 2200 & 3100 series and 200 series (requires
310 transmitter).
In addition to flow monitoring, the flow sensor can also be
used to prove primary pump flow. Refer to the Pump Operation
section of this brochure for additional details.
Energy Monitoring
The control has the capability to monitor Energy. The control
requires the boiler supply, boiler return sensor & the flow
sensor in order to calculate & display energy in either Therms
(THRM) or Gigajoules (GJ). The units are adjustable through
the ENERGY UNIT setting in the Toolbox menu. Select MBtu
for display in THRM and kWh for display in GJ.
Pressure Monitoring
The control has the capability to monitor system pressure
through the connection of a V(dc) style pressure sensor with a
signal range of 0.5 to 4.5 V (dc). Pressure is measured in either
psi or kPa. The units are adjustable through the PRESSURE
UNIT setting in the Toolbox menu.
The Pressure Sensor Range item in the Setup menu selects
from the available pressure ranges for the pressure sensor
to be used.
Examples of compatible aftermarket pressure sensors
include the Honeywell PX2 (AA) series and the Measurement
Specialties 7100 series.
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Vent Temperature Monitoring & Limiting
The control has the capability to measure & limit the vent
temperature. The VENT MAX setting defines the operation
of the vent sensor. If the vent temperature exceeds the VENT
MAX, the boiler plant is shut down. The boiler plan will not be
allowed to operate until the vent temperature drops 10°F (6°C)
below the VENT MAX. If OFF is selected, the vent temperature
is only monitored.
Alert Relay
The control has an Alert relay that closes whenever a control
or sensor error is detected, or when a warning or limiting
condition is detected. When the alert contact closes, refer to
the Error Messages section of this brochure to determine the
cause of the alert & how to clear the error.
Boiler Alert
If no temperature increase is detected at the boiler supply sensor
within this delay period, the Alert relay will close & the control
will display the NO HEAT error message. To clear the error,
press the CLEAR button while viewing the error message.
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Boiler Plant Operation
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The 284 is able to operate up to four boilers to maintain a boiler
target temperature. Proportional, Integral & Derivative (PID) logic
is used in order to satisfy the boiler target temperature for all
plant configurations with the exception of Dedicated Domestic
Hot Water (DDHW). Proportional (P) logic is used for DDHW.
For proper operation of the boilers, the 284 must be the only
control that determines when a boiler is to fire.
*Important: The boiler operator, or aquastat, remains in the
burner circuit & acts as a secondary upper limit on the boiler
temperature. The boiler aquastat temperature setting must be
adjusted above the 284’s boiler maximum setting in order to
prevent short cycling of the burner.
Boiler Operation
Single Stage On/Off Boiler
Once a boiler is required to operate, the control turns on the
Stage 1 relay. Once the control turns on the Stage 1 relay, it will
display the “Boiler” icon & “100%” under the respective boiler
output status in the display.
Two Stage On/Off Boiler
Once a boiler is required to operate, the control turns on the
Stage 1 relay. Once the Fire Delay time plus the Stage Delay
time has expired, the control can turn on the Stage 2 relay if it
is required. Once the control turns on the Stage 1 relay, it will
display the “Boiler” icon & “50%” under the respective boiler
output status in the display. Once the control turns on the Stage
2 relay, it will display “100%”.
Modulating Boiler
Once a boiler is required to operate, the control outputs an
analog signal corresponding to the Start Modulation setting
& then turns on the Stage 1 relay. Once the Fire Delay time
has expired, the modulating output is adjusted to the Minimum
Modulation setting. The control then holds the modulating output
at the Minimum Modulation until the Minimum Modulation Delay
time has elapsed. The control can then adjust the modulating
output from the Minimum Modulation as required. Once the
control turns on the Stage 1 relay, it will display the “Boiler”
under the respective boiler output status in the display. The
current firing rate is also displayed in the boiler output field.
EMS Boiler
Once a boiler is required to operate, the control outputs an
appropriate analog signal corresponding to the boiler target
temperature & then turns on the Stage 1 relay. Once the control
turns on the Stage 1 relay, it will display the “Boiler” under the
respective boiler output status in the display. The target water
temperature is also displayed in the boiler output field.
Boiler Target Temperature
The Boil TARG temperature is determined by the application
mode & the type of call received. The control displays the
temperature that it is currently trying to maintain at the boiler
supply sensor in the View menu. If the control does not presently
have a requirement for heat, it does not show a boiler target
temperature. Instead, “---” is displayed in the LCD.
Stage Delay
The STG DELAY is the minimum time delay between the firing
of each boiler or boiler stage. After this delay has expired the
control can fire the next boiler or boiler stage if it is required. This
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setting can be adjusted manually or set to an automatic setting.
When the automatic setting is used, the control determines the
best stage delay based on the operation of the system.
Modulation Mode
When using multiple modulating boilers, a selection must be
made regarding the sequencing of the boilers. Two modulation
mode settings are provided considering condensing & noncondensing boiler groups.
Modulation Mode is not available when the Application Mode
is configured for Dedicated Domestic Hot Water (DDHW).
•
MOD COND (Modulation Mode - Modulating, Condensing
Boiler Group)
This setting is applicable for a group at least two modulating,
condensing boilers.
•
MOD NC (Modulation Mode - Modulating, Non-Condensing
Boiler Group)
This setting is applicable for a group of at least two modulating,
non-condensing boilers.
Sequential Modulation (SEQ)
With Sequential Modulation, the control will turn on the fewest
boilers possible to meet the load. The control will bring a
boiler from its Minimum Modulation setting up to its Maximum
Modulation setting before bringing on another boiler. When
another boiler is turned on, the previous boiler will keep its
output at full fire.
100% 60% Off Off
Parallel Modulation (PAR)
With Parallel Modulation, the control will turn on the most
boilers possible to meet the load. The control will bring on
the first boiler at Minimum Modulation & does not increase its
modulation. If more boiler output is required, the second boiler
will turn on at Minimum Modulation & does not increase its
modulation. Additional boilers are turned on at their Minimum
Modulation setting until all boilers are on. If still more boiler
output is required, all boilers are modulated up in parallel until
they reach their Maximum Modulation settings.
40% 40% 40% 40%
Staging Mode Setup
When using multiple two-stage boilers, a selection must be
made regarding the staging order of the boilers. Two staging
modes are provided considering condensing & non-condensing
boiler groups.
•
STG COND (Staging Mode - Two-Stage, Condensing Boiler
Group)
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This setting is applicable for a group of at least two, two-stage
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---
condensing boilers.
STG NC (Staging Mode - Two-Stage Non-Condensing
•
Boiler Group)
This setting is applicable for a group of at least two, two-stage
non-condensing boilers.
Lo/Hi
If the Lo/Hi staging option is selected the control stages in
sequence all of the stages in a single boiler. Once all of the
stages are turned on, the control then stages in sequence all
of the stages of the next boiler in the rotation sequence.
Lo/Lo
If the Lo/Lo staging option is selected, the control stages all of the
Lo stage outputs in all of the boilers first. Once all of the boilers
are operating on their Lo stages, the control then operates the
second stage in each boiler in the same order.
Boiler Group Rotation
The control has two rotation settings including one for the
condensing boiler group & another for the non-condensing
boiler group.
ROT COND (Rotation - Condensing Boiler Group)
•
This setting is applicable for a group of at least two, two-stage
condensing boilers.
ROT NC (Rotation - Non-Condensing Boiler Group)
•
This setting is applicable for a group of at least two, two-stage
non-condensing boilers.
The Rotate feature changes the firing order of the boilers
whenever one boiler accumulates 48 hours more run time than
any other boiler. Rotation will be forced if any boiler accumulates
60 hours more run time. After each rotation, the boiler with the
least running hours is the first to fire & the boiler with the most
running hours is the last to fire. This function ensures that all of
the boilers receive equal amounts of use. When the Rotation
setting is set to Off, the firing sequence always begins with
lowest boiler to the highest boiler.
1 2
720 hours
To reset the rotation sequence, clear the Burner Run Time in
the Monitor (#) Menu.
672 hours
Boiler Run Time Monitoring
The running time of each boiler is logged in its respective Monitor
(#) menu. To reset the running time, select the appropriate
BURNER item in the Monitor (#) menu & select CLEAR until
“0” is displayed.
----------------------------
2 1
672 hours
----------------------
720 hours
Fixed Lead
When the boiler plant includes only one boiler group, either a
condensing or a non-condensing group, a selection must be
made regarding operation of the lead boiler.
ON
In some applications, it may be desirable to have the first boiler
fire first at all times while the firing sequence of the remaining boilers is changed using Equal Run Time Rotation. This
configuration is typical of installations where the boiler plant
includes similar boilers but the first boiler is required to be
the first to fire in order to establish sufficient draft for venting.
With a fixed lead rotation, the lead boiler is always turned on
first & turned off first. The Fixed Lead is always applied to the
boiler 1 output.
OFF
The lead boiler is not fixed to operate first in the firing sequence.
It is included in the rotation sequence with the other boilers.
Fixed Last
When the boiler plant includes only one boiler group, either a
condensing or a non-condensing group, a selection must be
made regarding operation of the last boiler.
ON
In some applications, it may be desirable to have the last
boiler fire last at all times while the firing sequence of the
remaining boilers is changed using Equal Run Time Rotation.
This configuration is typical of installations where the boiler
plant includes higher efficient boilers & a single lesser efficient
boiler. The lesser efficient boiler is only desired to be operated
when all other boilers in the plant are on & the load cannot be
satisfied. With a fixed last rotation, the last boiler is the last to
turn on & the first to turn off. The Fixed Last is always applied
to the boiler 4 output.
OFF
The last boiler is not fixed to operate last in the firing sequence.
It is included in the rotation sequence with the other boilers.
Condensing & Non-Condensing Boiler Groups
Operating a boiler plant that contains both condensing (high
initial cost) & non-condensing (lower initial cost) boilers allows
the boiler plant to achieve nearly the same operating efficiencies as operating all condensing boilers but at a much lower
installed cost to the building owner. High system efficiency can
be achieved as long as the condensing boilers are the first to
operate in the firing sequence. During mild weather, the lead
condensing boilers operate at lower boiler temperatures &
achieve their peak boiler efficiencies while the non-condensing
boilers are rarely operated. During very cold weather, the boiler
target temperature is often above the boiler’s condensation
point & the condensing & non-condensing boilers operate
together at roughly the same efficiency level.
When a condensing boiler is operating, it is desirable to operate
the boilers without a boiler minimum temperature being applied
to the boiler target. This allows the condensing boiler to operate
at its maximum efficiency. When a non-condensing boiler is
operating, a boiler minimum temperature should be applied to the
boiler target to prevent damage to the non-condensing boiler’s
heat exchanger from sustained flue gas condensation.
---------------------------------------
----------------------------------------
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The 284 supports operation of a condensing & a non-condensing
-------------------
boiler group. A condensing boiler group is created when at least
one boiler is selected to be condensing & a non-condensing
boiler group is created when at least one boiler is selected to
be non-condensing. The condensing boiler group is always
sequenced on first, followed by the non-condensing boiler
group.
Boiler Plant Flow (PLANT FLW)
-------------------
The control supports the option of having all boilers in the plant
to use either a pump or an isolation valve.
Boiler Pump (PUMP)
PUMP is to be selected when each boiler in the plant includes
its own circulator. This is typical of a conventional boiler plant
configuration that includes boilers that are flow sensitive.
PUMP is also to be selected when each boiler in the plant
neither includes a pump nor an isolation valve. This boiler
plant configuration could be used with boilers that are not flow
sensitive. It is expected that the primary pump provides flow
through all boilers, regardless of whether they are on or off.
Boiler Isolation Valve (VALV)
VALVE is to be selected when each boiler in the plant includes
an isolation valve. This boiler plant configuration could be used
with boilers that are not flow sensitive & is typical of systems that
incorporate a variable frequency drive (VFD) with the primary
pump. Systems incorporating variable speed primary pumping
(via a VFD) allow for increased pump electrical energy savings
during milder heating loads.
The purpose of the isolation valve is to isolate the boiler from
plant operation when the boiler is turned off. As a boiler is
isolated, the VFD will adjust the flow rate accordingly. The
isolation valve must include a spring return motor that is of the
normally open / fail open type. As the control does not include a
proof input for proving that the isolation valve is fully open prior
to burner ignition, the motor end switch, if available, should be
wired into the burner’s safety circuit.
Boiler isolation valve operation is dependent on whether the
Heat Call is permanent or intermittent.
Permanent Heat Call (e.g. external Heat Call shorted)
•
As the heating load becomes satisfied & a boiler is required
to be turned off, the boiler will turn off while its isolation valve
remains open for the boiler purge period time. After the boiler
purge time expires, the isolation valve will close. When the last
boiler in the plant turns off, its isolation valve will remain open,
allowing for a flow path of the primary pump.
When there is a subsequent requirement for plant operation
and a boiler is required to be turned on, its isolation valve will
be opened (if not already open) prior to burner ignition. Also,
if applicable, the isolation valve of the last boiler turned off in
the previous cycle will be turned off.
Intermittent Heat Call (e.g. external Heat Call interlocked
•
with space heating thermostat)
When the Heat Call is present, operation is consistent with the
operation defined for a Permanent Heat Call.
When the external Heat Call is removed, the isolation valve
of every boiler will be opened. When the external Heat Call is
re-applied, the control will keep open the valve of the boiler
that is due to be turned on first. The isolation valves of all other
boilers will be closed.
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Outdoor Temperature Reset Operation
-----------------------------------------
---------------------
-------------------------------------
Outdoor Temperature Reset is available by setting the
Application Mode in the Setup Menu to RSET.
In a heating system, the rate of heat supplied to the building
must equal the rate at which heat is lost. If the two rates are
not equal, the building will either cool off or over heat.
The rate of building heat loss depends mostly on the outdoor
temperature. Outdoor Reset allows a hot water heating
system to increase the water temperature, adding heat to the
building, as the outdoor temperature drops. The rate at which
the water temperature is changed as a function of outdoor
temperature is defined by the characterized heating curve.
Indirect Domestic Hot Water (IDHW) & setpoint operation
are both available during outdoor temperature reset
operation.
Heat Call
-----------------------------------------
A Heat Call is required in order for the control to provide target
water temperature for the space heating system. Once the
control registers a Heat Call, it will display the “Heat” icon
under the Calls in the display. A heat call can be provided
in two ways:
Contact Closure
A dry contact or 24 V (ac) signal is applied across the Heat
Call terminals 5 & 6.
tekmarNet® Device
A tN4 thermostat wired to one of the tN4 Bus terminals.
Characterized Heating Curve
---------------------
A characterized heating curve determines the amount the
target water temperature is raised for every 1° drop in outdoor
air temperature.
The characterized heating curve takes into account the
type of terminal unit that the system is using. Since different
types of heating terminal units transfer heat to a space using
different proportions of radiation, convection & conduction,
the supply water temperature must be controlled differently.
The control uses the terminal unit setting to vary the supply
water temperature to suit the terminal unit being used. This
improves the control of the air temperature in the building.
Terminal Unit
-------------------------------------
Select the appropriate terminal unit in the Setup Menu. This
will change the shape of the characterized heating curve
to better match the heat transfer properties of that specific
terminal unit.
Hydronic Radiant Floor (HRF1)
A heavy or high mass, hydronic radiant floor system. This type
of a hydronic radiant floor is embedded in either a thick concrete
or gypsum pour. This heating system has a large thermal mass
& is slow acting.
Hydronic Radiant Floor (HRF2)
A light or low mass, hydronic radiant floor system. Most
commonly, this type of radiant heating system is attached to
the bottom of a wood sub floor, suspended in the joist space,
or sandwiched between the subfloor & the surface. This type
of radiant system has a relatively low thermal mass & responds
faster than a high mass system.
Fancoil (COIL)
A fancoil terminal unit or air handling unit (AHU) consisting of
a hydronic heating coil & either a fan or blower. Air is forced
across the coil at a constant velocity by the fan or blower & is
then delivered into the building space.
Boiler Characterized Heating Curve
Terminal
Unit
Outdoor
Design
Boiler
Indoor
Decreasing Outdoor Temperatures
A Watts Water Technologies Company
Boiler
Design
Increasing Water Temperatures
Fin–tube Convector (CONV)
A convector terminal unit is made up of a heating element
with fins on it. This type of terminal unit relies on the natural
convection of air across the heating element to deliver heated air
into the space. The amount of natural convection is dependant
on the supply water temperature to the heating element & the
room air temperature.
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Radiator (RAD)
--------------------------------------------
----------------------------------
-------------------------------------
-------------------------------------
---------------
A radiator terminal unit has a large heated surface that is
exposed to the room. A radiator provides heat to the room
through radiant heat transfer & natural convection.
Baseboard (BASE)
A baseboard terminal unit is similar to a radiator, but has a low
profile & is installed at the base of the wall. The proportion of
heat transferred by radiation from a baseboard is greater than
that from a fin-tube convector.
Boiler Terminal Unit Defaults
When a terminal unit is selected for boiler zones, the control
loads default values for the boiler design, boiler maximum
supply, & boiler minimum supply temperatures. The factory
defaults can be changed to better match the installed system.
Locate the Terminal Unit setting in the Setup menu.
Terminal Unit
High Mass Radiant
Low Mass Radiant
Fancoil
Fin-Tube Convector
Radiator
Baseboard
Boil MIN is only available if at least one boiler is set to noncondensing. If all available boilers are set to condensing,
Boil MIN is not available & is hard-coded to OFF.
Boil DSGN Boil MAX *Boil MIN
120°F (49.0°C) 140°F (60.0°C) 140°F (60.0°C)
140°F (60.0°C) 160°F (71°C) 140°F (60.0°C)
190°F (88.0°C) 210°F (99.0°C) 140°F (60.0°C)
180°F (82.0°C) 200°F (93.5°C) 140°F (60.0°C)
160°F (71.0°C) 180°F (82.0°C) 140°F (60.0°C)
150°F (65.5°C) 170°F (76.5°C) 140°F (60.0°C)
Room
The Room setting is the desired room air temperature, according
to the outdoor reset heating curve. The Room setting parallel
shifts the heating curve up or down to change the target water
temperature. Adjust the Room setting to increase or decrease
the amount of heat available to the building. Once the heating
curve has been set up properly, the Room setting is the only
setting that needs to be adjusted. The default Room setting
is 70°F (21.0°C), & it can be adjusted for both the occupied &
unoccupied periods.
Outdoor Design
The outdoor design temperature is typically the coldest outdoor
air temperature of the year. This temperature is used when
doing the heat loss calculations for the building & is used to
size the heating system equipment. If a cold outdoor design
temperature is selected, the supply water temperature rises
gradually as the outdoor temperature drops. If a warm outdoor
design temperature is selected, the supply water temperature
rises rapidly as the outdoor temperature drops.
Boiler Indoor
The boiler indoor design temperature is the indoor temperature
the heating designer chose while calculating the heat loss for
the boiler water heated zones. This temperature is typically
70°F (21.0°C). This setting establishes the beginning of the
boiler characterized heating curve.
Boiler Design
The boiler design supply temperature is the boiler water
temperature required to heat the zones at the outdoor design
temperature, or on the typical coldest day of the year.
(Default automatically changes based on terminal unit
setting)
Warm Weather Shut Down (WWSD)
Warm Weather Shut Down disables the heating system when the
outdoor air temperature rises above this programmable setting.
When the control enters into WWSD, WWSD is indicated in
the status field. WWSD is only available when the Application
Mode is set to RSET.
While in WWSD, the control will still operate to provide
Indirect Domestic Hot Water or Setpoint operation.
--------------------------------------------
----------------------------------
-------------------------------------
-------------------------------------
---------------
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------------------------------------
----
------------------------------------
------------------
----------------------------------
Setpoint Operation
Setpoint operation is dependant on the application mode
setting.
If the Application Mode is configured for Outdoor Temperature
•
Reset (RSET) or Energy Management System (EMS), the control
provides heat for an additional setpoint load. The control does
respond to a Heat Call from a space heating system.
•
If the Application Mode is configured for Setpoint (SETP), the
control provides heat only for the setpoint load. The control
does not respond to a Heat Call for space heating.
Indirect Domestic Hot Water (IDHW) operation is available
during setpoint operation.
Setpoint Call
A Setpoint Call is required in order for the control to provide
heat to a setpoint load, such as a spa, pool or snowmelt load.
Once the control registers a Setpoint Call, it will display the
“Setpoint” icon under the Calls in the display. A setpoint call
can be provided in two ways:
Contact Closure
A dry contact or 24 V (ac) signal is applied across the Setpoint
Call terminals 9 & 10.
tekmarNet® Setpoint Control with Sensor
A Setpoint Call is provided through the tekmarNet® system.
This can be done through the tN4 Boiler Bus terminals with a
tekmarNet
Boiler Target Temperature During a Setpoint Call
When a Setpoint Call is present, a boiler target is
determined.
•
When using a Contact Closure, the boiler target is set to the
SETP Setpoint setting.
•
When using a tekmarNet® Setpoint Control, the boiler target
is set to the devices Exchange Supply setting.
If there are multiple devices calling for heat, the boiler target
is set to the highest temperature requirement.
------------------------------------
®
setpoint device such as a Setpoint Control 161.
----
Setpoint During UnOccupied
When using a Contact Closure, a second SETP Setpoint setting
is available for the Unoccupied periods.
DIP Switch must be set to Setback to view UnOccupied
items.
During the Away Scene, Setpoint Calls are ignored.
Setpoint Mode
The control has a Setpoint Mode setting that selects whether
or not setpoint heating is operational.
------------------------------------
OFF
Setpoint operation is not provided. All Setpoint Calls are ignored.
If this mode is selected while setpoint operation is underway,
all setpoint operation ceases.
ON
Setpoint heating is provided. All Setpoint Calls are responded to.
Operation is dependant on the Primary Pump During Setpoint
operation setting.
Primary Pump During Setpoint
This setting selects whether or not primary pump operation is
required during setpoint heating.
------------------
OFF
The primary pump does not turn on during setpoint heating. It
is assumed that the setpoint load pump will provide adequate
flow through the setpoint load & the boiler system loop.
Setpoint
Primary
ON
The primary pump turns on during setpoint heating.
Setpoint
Primary
Setpoint Priority
This setting selects whether or not priority of setpoint over
space heating is required. Setpoint priority stops or limits the
delivery of heat to the space heating system while the setpoint
load calls for heat. This allows for quick recovery of the load.
OFF
Setpoint priority is not provided. The primary pump can operate
when a Heat Call is present. Heating zones are unaffected by
setpoint heating.
----------------------------------
ON
Setpoint priority is provided & is dependant on the type of
space heating zones & whether or not the primary pump is
required to operate during setpoint heating.
For non-tN4 space heating, the primary pump shuts off to
provide priority. If the primary pump is required to operate for
setpoint heating, priority requires the use of an external relay
to force the heating zones off.
For tN4 space heating, the primary pump can operate when a
Heat Call is present. If the boilers are unable to maintain the
boiler target temperature, the tN4 zones are sequentially shut
off using tN4 communication to provide priority.
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Priority Override
---------------------------------
---------------------
------------------------------
-----------------------------------------
---------------------------------------
Priority Override applies when Setpoint Priority is set to ON. It
prevents the building from cooling off too much or the possibility
of a potential freeze up during setpoint priority.
When set to auto, the priority time is calculated based on outdoor
temperature. At or below the design outdoor temperature, 15
minutes are allowed for setpoint priority. At or above the Indoor
Design temperature, 2 hours are allowed for setpoint priority.
The time allowed for setpoint priority varies linearly between
the above two points. There is a manual setting also available
in the Setup menu.
The priority timer does not start timing until priority is selected
& both a Setpoint Call & a Heat Call exist together. Once the
allowed time for priority has elapsed, the control overrides the
setpoint priority & resumes space heating.
---------------------------------
Energy Management System (EMS) Operation
Conditional Setpoint Priority
If the boiler supply temperature is maintained at or above the
required temperature during setpoint heating, this indicates
that the boilers have enough capacity for setpoint & possibly
space heating as well. As long as the boiler supply temperature is maintained near the target, setpoint & heating occurs
simultaneously.
Setpoint Post Purge
After a Setpoint Call from a tN4 device is removed, the control
can perform a post purge. The control shuts off the boilers &
continues to operate, if applicable, the primary pump. This purges
the residual heat from the boilers into the setpoint load. The
control continues this purge until one of the following occurs:
1. A Heat Call is detected.
2. The boiler supply drops 20°F (11.0°C) below the setpoint
target temperature.
3. Two minutes elapse.
------------------------------
---------------------
The control can accept an external DC signal from an Energy
Management System (EMS). The control converts the DC
signal into the appropriate boiler target temperature for the
space heating system.
EMS is available by setting the APP MODE in the Setup Menu
to EMS.
Indirect Domestic Hot Water (IDHW) & setpoint are both
available during EMS operation.
Heat Call
A Heat Call is required in order for the control to provide a
target water temperature for the space heating system. Once
the control registers a Heat Call, it will display the “Heat” icon
under the Calls in the display.
A Heat Call is provided by:
Input Signal
An external signal is generated by applying a voltage between
0 V (dc) & 10 V (dc) across the EMS (+) In & Com (-) terminals
(16 & 19). Voltages that exceed 10 V (dc) will still be considered
a 10 V (dc) signal.
If the EMS signal goes below the minimum voltage, the “Heat”
icon under the Calls in the display is turned off. The boiler target
temperature is displayed as “– – –” to indicate that there is no
longer a call for heating.
External Heat Call terminals are not operational.
EMS Signal
The control can accept either a 0-10 V (dc) signal or a 2-10 V
(dc) signal. The EMS SGNL setting must be set to the proper
setting based on the signal that is being sent to the control.
0 - 10 V (dc) or 0 - 20 mA
When the 0-10 V (dc) signal is selected, an input voltage of
1 V (dc) corresponds to a boiler target temperature of 50°F
(10.0°C). An input voltage of 10 V (dc) corresponds to a boiler
target temperature of 210°F (99.0°C). As the voltage varies
between 1 V (dc) & 10 V (dc) the boiler target temperature varies
linearly between 50°F (10.0°C) & 210°F (99.0°C). If a voltage
below 0.5 V (dc) is received the boiler target temperature is
-----------------------------------------
---------------------------------------
displayed as “– – –” indicating that there is no longer a call
for heating.
A 0 - 20 mA signal can be converted to a 0 - 10 V (dc) signal
by installing a 500 resistor between the EMS (+) In & Com
(-) terminals (16 & 19).
2 - 10 V (dc) or 4 - 20 mA
When the 2 - 10 V (dc) signal is selected, an input voltage of
2 V (dc) corresponds to a boiler target temperature of 50°F
(10.0°C). An input voltage of 10 V (dc) corresponds to a boiler
target temperature of 210°F (99.0°C). As the voltage varies
between 2 V (dc) & 10 V (dc) the boiler target temperature varies
linearly between 50°F (10.0°C) & 210°F (99.0°C). If a voltage
below 1.5 V (dc) is received the boiler target temperature is
displayed as “– – –” indicating that there is no longer a call
for heating.
A 4 - 20 mA signal can be converted to a 2 - 10 V (dc) signal
by installing a 500 resistor between the EMS (+) In & Com
(-) terminals (16 & 19).
CONVERSION TABLE 0 - 10
0 - 20 mA* 0 - 10 V (dc) Boiler Target
0 0 – – – (OFF)
2 1 50°F (10.0°C)
4 2 68°F (20.0°C)
6 3 86°F (30.0°C)
8 4 103°F (39.5°C)
10 5 121°F (49.5°C)
12 6 139°F (59.5°C)
14 7 157°F (69.5°C)
16 8 174°F (79.0°C)
18 9 192°F (89.0°C)
20 10 210°F (99.0°C)
*Requires 500 Resistor in Parallel
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CONVERSION TABLE 2 - 10
-----------------------------------------
---------------------------------
------
------------------------
4 - 20 mA* 2 - 10 V (dc) Boiler Target
0 0 – – – (OFF)
4 2 50°F (10.0°C)
6 3 70°F (21.0°C)
8 4 90°F (32.0°C)
10 5 110°F (43.5°C)
12 6 130°F (54.5°C)
14 7 150°F (65.5°C)
16 8 170°F (76.5°C)
18 9 190°F (88.0°C)
20 10 210°F (99.0°C)
*Requires 500 Resistor in Parallel
EMS Offset
For external input operation, the boiler target (determined
from the external input signal) may be fine tuned. The EMS
OFFST setting is used to provide the fine tuning. The setting
may be adjusted ±10°F (±5.5°C). When set to 0°F (0.0°C), if
the temperature determined from the external signal is 140°F
(60.0°C), the boiler target will be 140°F (60.0°C). When set
to +5°F (+3.0°C) & with the same external signal represents
140°F (60.0°C), the boiler target will be 145°F (63.0°C).
Example
Range = 0 - 10 V (dc)
Input = 7 V (dc) 157°F (69°C)
Offset = +5°F (3°C) + 5°F (3°C)
Boiler Target = 162°F (72°C)
The minimum & maximum settings also apply for external input
operation. For example, if a boiler minimum of 140°F (60.0°C) is
set & the external signal received represents 80°F (27.0°C), the
boiler target will be 140°F (60.0°C). MIN will also be displayed
in the status field to indicate that a limiting condition is in effect.
This also applies for the MAX limit.
Indirect Domestic Hot Water (IDHW) Operation
IDHW operation is applicable during the following application
modes: outdoor temperature reset, fixed setpoint & EMS.
DHW Call
A DHW Call is required in order for the control to provide heat
to an indirect DHW tank. Once the control registers a DHW
Call, it will display the “DHW” icon under Calls in the display.
A DHW Call can be provided in three ways:
DHW Tank Aquastat
If a DHW Tank Aquastat (mechanical switch) is used to apply
a DHW Call, the tank is heated to the aquastat temperature
setting. A dry contact or 24 V (ac) signal is applied across the
IDHW Call terminals 7 & 8.
IDHW Sensor must be set to Off.
DHW Sensor
A DHW Tank Sensor provides superior temperature control
of the tank compared to an aquastat. The control can register
a DHW Call when a DHW Sensor is wired to terminals 21
& 22. Once the DHW Sensor temperature drops 1/2 of the
IDHW Differential setting below the iDHW Setpoint, the control
registers a DHW Call.
The IDHW Sensor must be set to On. There cannot be
an external IDHW Call when using a DHW sensor.
tekmarNet® Setpoint Control with Sensor
A DHW Call is provided through the tekmarNet® system. This can
be done through the tN4 Boiler Bus terminals with a tekmarNet®
setpoint device such as a Setpoint Control 161.
DHW Differential
Due to large differences between the heating load & the DHW
load, a separate DHW differential should be used whenever a
DHW Call is present. This will improve staging & boiler cycling.
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When using a DHW Sensor, a DHW Call is registered when the
temperature at the DHW sensor drops the IDHW DIFF setting
below the IDHW Setpoint setting. The DHW Call is satisfied
once the temperature at the DHW Sensor rises to the IDHW
Setpoint setting.
DHW Target
ON
Boiler Target Temperature during a DHW Call
OFF
IDHW
Differential
------
When a DHW Call is present, a boiler target is determined.
When using a DHW Tank Aquastat, the boiler target is set
•
to the IDHW Exchange setting.
When using a DHW Tank Sensor, the boiler target is fixed
•
at the IDHW Setpoint setting plus 40°F (22.0°C).
When using a tekmarNet® Setpoint Control, the boiler target
•
is set to the devices Exchange Supply setting.
If there are multiple devices calling for heat, the boiler target
is set to the highest temperature requirement.
IDHW During UnOccupied
------------------------
When using a DHW Tank Aquastat, a second IDHW Exchange
setting is available for the UnOccupied or Sleep period.
When using a DHW Sensor, a second IDHW Setpoint setting
is available for the UnOccupied or Sleep period.
DIP Switch must be set to Setback to view UnOccupied items.
During the Away Scene, DHW Calls are ignored.
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IDHW Mode
-------------------------------------
----------------------------------
---------------------------------------
-------------------------------------
-------------------------------------
The control has a IDHW MODE setting that selects whether
or not indirect DHW operation is active.
OFF
IDHW operation is inactive. All DHW Calls are ignored. If this
mode is selected while DHW operation is underway, all DHW
operation ceases.
ON
IDHW operation is active. All DHW Calls are responded to.
IDHW Location
----------------------------------
The control has a IDHW Location setting that selects where
the indirect DHW tank is located in the system. This setting
determines the operating sensor & affects pump operation.
NEAR
The indirect DHW tank is piped in parallel within the near boiler
piping of boiler 4. When a valid DHW Call is present, the IDHW
Pump relay turns on & boiler pump 4 turns off. The control uses
the boiler 4 outlet sensor as the operating sensor in order to
measure the boiler supply temperature supplied to the indirect
DHW tank. There are two boiler target temperatures. One for
the space heating system (Boil TARG) & one for the indirect
DHW system (IDHW TARG).
Primary Pump During IDHW
---------------------------------------
The control has a Primary Pump during IDHW setting that
selects whether or not the primary pump is required during
indirect DHW operation.
OFF
The primary pump does not turn on during indirect DHW operation. This would be typical of an indirect DHW tank piped in
parallel in the boiler system loop. It is assumed that the DHW
pump will provide adequate flow through the indirect DHW
heat exchanger & the boiler system loop.
DHW
Pump
ON
Primary
Pump OFF
ON
The primary pump turns on during indirect DHW operation.
This would be typical of an indirect DHW tank piped in
primary/secondary in the boiler system loop.
Near Boiler
All boilers are used for space heating requirements.
•
Boiler 4 is used for indirect DHW when there is a DHW
•
Call.
•
The dedicated indirect DHW boiler is always boiler 4, even
if there are less than four boilers.
If boiler 4 is disabled & NEAR is selected for the IDHW Location,
•
the dedicated indirect DHW boiler 4 will not operate.
Boil
The indirect DHW tank is piped in the boiler system loop. When
a valid DHW Call is present, the IDHW Pump relay turns on.
Piped off
boiler
system loop
DHW
Pump
ON
Primary
Pump ON
IDHW Priority
-------------------------------------
The control has a IDHW Priority setting that selects whether or
not priority of indirect DHW is required over the space heating
system. Indirect DHW priority stops or limits the delivery of
heat to the space heating system while the indirect DHW tank
calls for heat. This allows for quick recovery of the indirect
DHW tank.
OFF
IDHW priority is not provided. The primary pump can operate
when a Heat Call is present. Heating zones are unaffected by
indirect DHW operation.
ON
IDHW priority is provided & is dependant on the type of space
heating zones & whether or not the primary is required to
operate during IDHW operation.
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For non-tN4 space heating, the primary pump shuts off to
---------------------------------
------------------------
---------------------------------
-------------------------------
-------------
-------------------------
provide priority. If the primary pump is required to operate for
IDHW, priority requires the use of an external relay to force
the heating zones off.
For tN4 space heating, the primary pump can operate when a
Heat Call is present. If the boilers are unable to maintain the
boiler target temperature, the tN4 zones are sequentially shut
off using tN4 communication to provide priority.
Priority Override
Priority override applies when IDHW Priority is set to ON &
prevents the building from cooling off too much or the possibility
of a potential freeze up during IDHW priority.
When set to auto, the priority time is calculated based on outdoor
temperature. At or below the design outdoor temperature, 15
minutes is allowed for IDHW priority. At or above the design
indoor temperature, 2 hours is allowed for IDHW priority. The
time allowed for IDHW priority varies linearly between the
above two points. There is a manual setting also available in
the Setup menu.
The priority timer does not start timing until priority is selected
& both a DHW Call & a Heat Call exist together. Once the
allowed time for priority has elapsed, the control overrides the
DHW priority & resumes space heating.
---------------------------------
Automatic Priority Override
2 hours
15 mins
Indoor Design
Temperature
Conditional IDHW Priority
If the boiler supply temperature is maintained at or above the
required temperature during IDHW operation, this indicates that
the boilers have enough capacity for IDHW & possibly heating
as well. As long as the boiler supply temperature is maintained
near the target, IDHW & heating occurs simultaneously.
IDHW Post Purge
After the DHW Call is removed, the control performs a purge.
The control shuts off the boilers & continues to operate the
IDHW Pump & the primary pump if applicable. This purges the
residual heat from the boilers into the DHW tank. The control
continues this purge until one of the following occurs:
1. A Heat Call is detected.
2. The boiler supply drops 20°F (11.0°C) below the DHW
target temperature.
3. The DHW tank temperature rises above the DHW setpoint
plus 1/2 DHW Differential.
4. Two minutes elapse.
---------------------------------
Outdoor Design
Temperature
------------------------
IDHW Mixing Purge
After IDHW operation, the boiler is extremely hot. At the same
time, the heating zones may have cooled off considerably after
being off for a period of time. When restarting the heating
system after a DHW Call with priority, the control shuts off the
boiler & continues to operate the IDHW pump while the primary
pump is turned on. This allows some of the DHW return water
to mix with the cool return water from the zones & temper the
boiler return water.
IDHW with Low Temperature Boilers
If DHW heating is to be incorporated into a low temperature
system such as a radiant floor heating system, a mixing device
is often installed to isolate the high DHW supply temperature
from the lower system temperature. If a mixing device is not
installed, high temperature water could be supplied to the
low temperature system while trying to satisfy the DHW Call.
This may result in damage to the low temperature heating
system.
The control is capable of providing IDHW heating in such a
system while minimizing the chance that the temperature in the
heating system exceeds the design supply water temperature.
In order to do this, the following must be true:
All available boilers are set to condensing.
•
IDHW Location set to Boil.
•
IDHW Priority set to ON.
•
tN4 present (IF Primary Pump during IDHW operation is
•
set to ON)
On a DHW Call, the control provides IDHW priority by sending a
message on the boiler temperature bus to the tN4 thermostats
to shut off the heating zones for a period of time. The length
of time is based on the outdoor air temperature, or selectable
time, as described in the IDHW Priority Override section.
However, if the DHW Call is not satisfied within the allotted
time, the boiler shuts off & the heat of the boiler is purged
into the DHW tank. A IDHW mixing purge occurs in order to
reduce the boiler water temperature & once the boiler supply
temperature is sufficiently reduced, the IDHW Pump contact
shuts off. The heating system zones are allowed to turn on
for a period of time to prevent the building from cooling off.
After a period of heating, & if the DHW Call is still present, the
control shuts off the heating system & provides heat to the
DHW tank once again.
IDHW Boil COUNT IDHW
Selects the number of boilers to be used for IDHW operation.
This applies when only there is a requirement for IDHW. All
available boilers are allowed to operate if there is both a
requirement for space heating & IDHW.
-------------------------------
-------------
-------------------------
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-----------------------------------------
--------------------------------
----
-----------------------
Dedicated Domestic Hot Water (DDHW) Operation
----------------------------------------
-----------------------------------------
----
The control can operate to provide heat for a Dedicated
Domestic Hot Water (DDHW) system.
DDHW heating is available by setting the Application Mode in
the Setup Menu to DDHW.
DHW Call
A DHW Call is required in order for the control to provide heat
to a dedicated DHW tank. Once the control registers a DHW
Call, it will display the “DHW” icon under Calls in the display.
This can be done by:
DHW Sensor
The control can register a DHW Call when a DHW Sensor is
wired to terminals 21 & 22. Once the DHW Sensor temperature
drops 1/2 of the DDHW Differential setting below the DDHW
Setpoint, the control registers a DHW Call.
-----------------------------------------
DDHW Differential
A DHW Call is registered when the temperature at the DHW
sensor drops the DDHW DIFF setting below the DDHW Setpoint
setting. The DHW Call is satisfied once the temperature at the
DHW Sensor rises to the DDHW Setpoint setting.
DHW Target
ON
Boiler Target Temperature During a DDHW Call
When a DHW Call is present, a boiler target is determined. The
boiler target is set to the DDHW Setpoint setting.
DDHW During UnOccupied
A second DDHW Setpoint setting is available for the
UnOccupied periods.
DIP Switch must be set to Setback to view UnOccupied
items.
During the Away Scene, DHW Calls are ignored.
--------------------------------
OFF
IDHW
Differential
----
-----------------------
Building Automation System (BAS)
The control can communicate with a Building Automation System
(BAS) to provide remote monitoring & adjustment capability.
BAS Mode
There are two modes of BAS communication that define the
interaction between the BAS & the control. The level of interaction is determined by the Application Mode setting.
Refer to the BAS Integration Manual 284_B for more information
including a listing of the read / write parameters.
Monitor
Monitor mode is available when the Application Mode is set
to either Outdoor Temperature Reset, Setpoint, Dedicated
Domestic Hot Water (DDHW) or Energy Management System
(EMS).
With Monitor mode, the control allows for viewing & adjustment
capability of select items within the various menus.
Temp erature
Temperature mode is available when the Application Mode is
set to Building Automation System (BAS).
With Temperature mode, the control operates to maintain
the setpoint temperature provided over the BAS network. In
order for the control to be able to operate to maintain the BAS
Setpoint, the BAS must also write a Setpoint Call command
over the BAS network.
----------------------------------------
If primary pump operation is desired, the BAS must write a
BAS Primary Pump command over the BAS network.
If indirect DHW pump operation is desired, the BAS must write
a BAS IDHW Pump command over the BAS network.
BAS Type
The control supports Modbus® & BACnet® IP communications.
Selection is made through BAS TYPE item in the BAS menu.
If the control is not being connected to a BAS network, select
NONE.
Network Configuration Settings in BAS Menu
Refer to the BAS menu section of this brochure for a listing of
all the BAS network configuration settings.
-----------------------------------------
----
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Pump Operation
-------------------------
-----------------------------------
------------------------------
Primary Pump Operation
The control includes two primary pump outputs with capability
for sequencing. There is pump enable setting for each primary
pump in the Setup menu. When both primary pumps are set
to Auto, primary pump sequencing is activated. Primary pump
1 & 2 are operated in stand-by mode when pump sequencing
is activated.
The running times of the primary pumps are logged in the
Monitor Menu. To reset these values back to zero, select
“Clear” while viewing this item.
Operation of the primary pump(s) is determined from the
Application Mode & the presence of an appropriate call.
Application Mode: Outdoor Temperature Reset (RSET)
Heat Call from Contact Closure.
•
Heat Call from tN4 Device & that zone’s thermostat has H1
•
Pump set to On. tN4 thermostats also include a thermal
actuator setting which can delay the primary pump for 3
minutes to allow thermal actuators to open.
Setpoint Call from Contact Closure & Primary Pump during
•
Setpoint operation set to ON.
DHW Call & the Primary Pump during IDHW operation set
•
to ON.
Application Mode: Setpoint (SETP)
Setpoint Call from Contact Closure & Primary Pump during
•
Setpoint operation set to ON.
•
DHW Call & the Primary Pump during IDHW operation set
to ON.
Application Mode: Energy Management System (EMS)
•
Heat Call from Analog Input Signal.
•
DHW Call & the Primary Pump during IDHW operation set
to ON.
•
Setpoint Call from Contact Closure & Primary Pump during
Setpoint operation set to ON.
Application Mode: Building Automation System (BAS)
•
BAS Setpoint Pump Call.
Flow Proof Call
The control includes a flow proof call in order to prove flow
once a primary pump has turned on. In order for boiler plant
operation to commence, the proof call must be present. A flow
proof call is required at all times during pump operation.
Once a primary pump contact is turned on, a flow proof call
must be present before the flow proof delay has expired.
The flow proof call feature is enabled by setting the DIP switch
to the External Flow Proof position.
The flow proof call feature can only be used when the
control is configured to operate the primary pump for
all loads.
If there are multiple loads (e.g. Heat Call and DHW Call)
and the primary pump is disabled for DHW operation, then
the control cannot provide flow proving and the feature
must be disabled. In this case, the flow proof feature must
be obtained through another control such as the Pump
Sequencer 132.
-----------------------------------
-------------------------
A flow proof call can be provided in two ways:
Contact Closure
A dry contact or 24 V (ac) signal is applied across the Flow
Proof Call terminals 1 & 2.
A contact closure can come from a flow switch, pressure
differential switch, current sensing or power sensing device.
∆P Pressure Differential Switch
FS Flow Switch
KW Power Sensing Device
Amp Current Sensing Device
Analog Flow Sensor
A 4-20 mA style flow sensor can be used to both monitor &
prove flow. The Flow Sensor item in the Setup Menu must be
set to ON to enable the flow sensor to provide monitoring. The
Flow Rate 4 mA and Flow Rate 20 mA items in the Setup Menu
configure the flow range for the flow sensor being used.
To enable the flow proof feature, the Flow Proof item in the Setup
Menu must be set to a flow percentage. The flow percentage is
the percentage of full flow (dependant on the configured flow
range) that must be achieved within the flow proof delay time
to prove flow. If the flow sensor is not required to prove flow,
the Flow Proof item must be set to OFF.
Stand-by Operation
The control only operates one primary pump at a time. A
flow proof device can be used to detect when stand-by pump
operation is required.
When an appropriate Call is registered, the lead pump is
•
activated, & the control waits for flow to be established within
the flow proof delay time.
•
If no flow is established, the lead pump is de-activated, the
lag pump is activated & the control waits again for the flow
to establish within the flow proof delay time.
If no flow is established with the lag pump, the control
•
will make a second attempt to prove flow with the pumps,
starting with the lead pump. If flow cannot be proved after
the second attempts, the control stops operation until the
error is cleared. Verify that the pumps & flow proof device
are working correctly before clearing the error.
If the lead pump establishes flow, & fails during operation,
•
the lag pump is activated.
If at any time, one or both pumps fail to prove flow, an error
•
message is displayed.
Normal Operation
------------------------------
ON
OFF
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Stand-by Pump Operation
---------------------------------
-------------------------
---------------------------
-----------------------------
--------------------
------------
--------------
Failed
ON
Flow Proof Delay
The control waits a period of time to receive a flow proof call
from the time the primary pump turns on. If the control does
not receive a flow proof call within that period of time, the
primary pump turns off & the stand-by primary pump (if active)
turns on. The control then waits that period of time again for
the stand-by primary pump to prove flow. If flow is not proven,
the stand-by pump turns off. The period of time is set through
the FLW PROOF item in the Setup menu & it is adjustable
between 10 seconds & 3 minutes.
Flow Proof Demand Test
The control includes a flow proof demand test in order to
determine if the flow/pressure device has failed. A flow proof
failure is detected if a flow proof call is present after the pumps
have been shut off for more than four minutes. This can occur
if the flow proof device sticks in the on position even when flow
has stopped in the system. A flow proof call error will latch
when this condition exists.
Primary Pump Rotation
The control rotates the pumps based on the primary pump
Rotate item in the Setup menu. Frequency of Rotation is based
on the running time of the pumps. Rotation is done when the
lead pump is off. If the lead pump runs continuously, the rotation
is delayed for up to 12 hours. If the pump runs continuously
& rotation is required, the control shuts off the lead pump & 1
second later the stand-by pump is turned on. This eliminates
overloading the pump electrical circuit. Upon turning on the
stand-by pump the flow proof call input is checked after the
flow proof call delay time.
Primary Pump Purge
After the last valid call is removed, the primary pump is operated
for an additional period of time. If the last call came from a tN4
zone, the control sends out a purge message to override the
zone open for the duration of the boiler purge. At the end of
the purge, the zone override is removed so the zone is allowed
to close & turn off the primary pump. If the last call came from
a non-tN4 zone, the purge period for the primary pump is
adjustable between 10 seconds & 20:00 minutes.
Boiler Pump / Valve Operation
The control includes relays to operate the boiler pumps /
valves.
The control includes a boiler pre-purge which operates the
respective pump / valve for a period of time before the boiler
is ignited in order to purge potential residual heat out of the
boiler. For isolation valves, this time also allows for the valve
to spring open prior to boiler ignition. For pumps, the time is
determined from the boiler mass setting. As the boiler mass
setting is increased, the time is also increased. For DHW and
Setpoint Calls, to help reduce boiler pick-up times, the time
---------------------------------
-------------------------
---------------------------
-----------------------------
--------------------
is fixed at 4 seconds. For isolation valves, the time is always
fixed at 30 seconds.
The control includes a boiler post-purge feature that operates
the respective pump / valve for a period of time after the boiler
is turned off. This feature will purge heat out of the boiler &
aid in reducing “kettling”. The amount of time for the boiler
post-purge is adjustable between 10 seconds & 20:00 minutes.
The period of time is adjustable through the boiler post-purge
setting in the Source (#) Menu.
Indirect DHW (IDHW) Pump Operation
The control includes a relay to operate an indirect DHW
pump.
Operation of the IDHW pump is determined by the Application
Mode & the presence of an appropriate call.
Application Mode: Outdoor Temperature Reset,
Setpoint, Energy Management System
DHW Call from Contact Closure.
•
DHW Call from DHW Sensor.
•
DHW Call from tekmarNet
•
Application Mode: Building Automation System
BAS DHW Pump Call.
•
®
Setpoint Control with Sensor.
DHW Recirculation Pump Operation
The control has the capability to operate a DHW Recirculation
Pump when the control is configured for either Indirect
Domestic Hot Water (IDHW) or Dedicated Domestic Hot
Water (DDHW). IDHW is available when the application
mode is set to either outdoor temperature reset, setpoint or
EMS. DDHW is available when the applicable mode is set
to DDHW. The Aux Relay setting in the Setup Menu must
be set to DHWR to enable the DHW recirculation pump.
The DHW recirculation pump operates continuously during the
Occupied period. If setback is enabled, the pump operates
when heat is required during the Unoccupied period.
------------
--------------
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Combustion Air (C.A.) Damper & DHW Recirculation Pump Settings
-----------------------------------
------------------
----------------------
------------
----------------------------
----------------------
-----------
-------------------
----------------------------------
Auxiliary Relay
The control includes an auxiliary relay that can be used either
for a combustion / venting device or a DHW recirculation pump.
Selection is made through the AUX RELAY item in the Setup
menu. Off is also available if there is no Auxiliary device.
DHW Recirculation Pump
When the Aux Relay is set to DHWR, terminals 43 & 44 operate
a domestic hot water (DHW) recirculation pump. Refer to the
Pump Operation section of this brochure for a description of
the DHW recirculation pump operation.
Combustion Air Damper
When the Aux Relay is set to DMPR, terminals 43 & 44 operate
a combustion air damper / fan motor or power vent motor. The
relay closes once an appropriate call (e.g. Heat) is received
& the control has determined that one or more boilers need
to be turned on.
Combustion Air (C.A.) Proof Call
The C.A. Proof Call is used to prove a combustion air or venting
device. Boiler operation cannot occur until the proof call is
present. If the proof call is lost during operation, the boiler
plant is sequenced off.
Once the DMPR contact is turned on, a C.A. proof call must
be present before the C.A. proof delay has expired.
The C.A. proof call feature is enabled by setting the DIP switch
to the External C.A. Proof position.
A C.A. proof call can be provided by:
Contact Closure
A dry contact or 24 V (ac) signal is applied across the C.A.
Proof Call terminals 3 & 4.
-----------------------------------
------------------
Combustion Air Proof Delay
The control includes a time delay that is associated with the
C.A. proof call feature in order to determine if the proof device
is functional. Once the DMPR relay closes, the control allows
for this time delay to receive the C.A. proof call. If the C.A.
proof call is not received within the delay time, the control will
display an error message.
Combustion Air (C.A.) Proof Call Test
The control includes a C.A. proof call test in order to determine
if the proving device has failed. If the DMPR relay is opened,
the C.A. proof call should not be present after 4 minutes. If
the C.A. proof call remains, the control will display an error
message.
Combustion Air Delay
If the C.A. proof call feature is set to OFF (DIP switch), sequencing
only occurs once a user adjustable time delay elapses.
----------------------------
Combustion Air Post Purge
There is a fixed 15 second post purge of the C.A. relay after
the last boiler has turned off, or the appropriate call (e.g. Heat)
is removed. If there is a call still present once the last boiler
has turned off, the control can look at the error & determine
if sequencing is to occur in a “short” period of time. If the
control does anticipate staging, the DMPR relay will remain
on. Otherwise, the DMPR relay will be turned off once the 15
second post purge elapses.
----------------------
------------
----------------------
Setting the Schedule
To provide greater energy savings, you can operate the
control on a programmable schedule. The schedule is stored
in memory & is not affected by loss of power to the control.
If a tN4 network is detected the control can become either a
schedule member or schedule master.
Control (CTRL) Schedule (tN4 present)
The schedule only applies to the control. The control follows
its own schedule & the events are not communicated to tN4
thermostats.
Master Schedule (tN4 present)
If the control is connected to tN4 thermostats, then the control
can operate on a master schedule. You can set up a maximum
of four master schedules on the tN4 Network. A master schedule
is available to all devices on the tN4 network. Master schedules
simplify installation since one master schedule may be used
by multiple devices.
To create a master schedule:
Assign the control to be a schedule master by setting the
•
Heat Schedule item in the Schedule menu to Master (MST)
1 to 4. After a master schedule is selected, a clock symbol
will appear in the View menu display.
-------------------
-----------
The 284 Setback /Off DIP Switch must be set to Setback
to access the Schedule Menu.
To follow a master schedule:
Assign the control to follow a master schedule by setting
•
the Heat Schedule in the Schedule menu to Member (MBR)
1 to 4.
Schedule Types
The schedule type determines when the schedule repeats
itself. This control includes four different schedule types:
• 24 Hour: Repeats every 24 hours.
• 5-2: Repeats on a weekly basis. However, it breaks the week
into weekend followed by the weekdays. This reduces the
amount of schedule event settings.
• 5-11: Repeats on a weekly basis. However, it breaks the
weekend into Saturday & Sunday followed by the weekdays.
This reduces the amount of schedule event settings.
• 7 Day: Repeats on a weekly basis & allows for separate event
times for each day.
----------------------------------
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Schedule Type
•
•
• •
• •
• •
•
•
•
•
•
-------
--------------
-------------------------------
-------------------------------------------
Day 24 Hour 5-2 5-11 7 day
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Events / Day
The events / day can be either 4 or 2. An event is a time at
which the control changes the target temperature. The event
time can be set to the nearest 10 minutes. If you wish to have
the thermostat skip the event, enter “--:--“ as the time. The “--:--“
time is found between 11:50 PM & 12:00 AM. See the table,
Events / Day, for more details regarding types of events.
Events / Day Event 24Hr Sat Sun Mon Tue We Thu Fri
6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM
8:00 AM 8:00 AM 8:00 AM 8:00 AM 8:00 AM 8:00 AM 8:00 AM 8:00 AM
6:00 PM 6:00 PM 6:00 PM 6:00 PM 6:00 PM 6:00 PM 6:00 PM 6:00 PM
10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM
4 events per day
Occupied 1
UnOccupied 1
Occupied 2
UnOccupied 2
or
2 events per day
Occupied
Unoccupied
6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM
10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM
Time Clock
The control has a built-in time clock to allow the control to operate on a schedule. A battery-less backup allows the control to
keep time for up to 4 hours without power. The time clock supports automatic adjustment for Daylight Saving Time (DST) once
the day, month, & year are entered. Use the Time menu to set the correct time, day, month, & year.
The Setback / Off DIP Switch must be set to Setback before the Time menu can be accessed.
tekmarNet®4 Communication
The 284 can communicate with tekmarNet® Thermostats, Wiring
Centers & Setpoint Controls to maximize system efficiency &
comfort. The 4 tN4 bus connections on the 284 use the boil
water temperature. No mix temperatures are available to the
284. tekmarNet® Thermostats enable the Indoor Temperature
Feedback feature on the 284. This allows water temperatures
to be adjusted to compensate for both indoor & outdoor temperatures. Each bus can include up to 24 devices, providing
a total of 96 on the tekmarNet® network.
Cycle Length Setting in Adjust Menu (tN4)
The control includes an adjustment for the cycle length. The
cycle length adjustment allows for synchronization of tN4 zones.
An Auto setting allows for the cycle length to be automatically
calculated to balance equipment cycling & comfort.
In the tekmarNet®4 system, all of the tekmarNet®4 Thermostats
determine the best cycle length for their zone. The thermostats
look at trying to maintain the longest possible cycle length while
keeping temperature swings to a minimum. The Thermostats
do this every cycle & send their ideal cycle length time to the
284. In order to operate the system as efficiently as possible, all
of the zones must operate based on the same cycle. In order to
do this, the 284 listens to all of the cycle length requests from
all of the tekmarNet®4 Thermostats. The 284 then determines
the average cycle length & sends this information to all of the
tekmarNet®4 Thermostats, allowing them to operate on the
same cycle.
-------
Indoor Temperature Feedback (tN4)
Indoor feedback applies when the 284 is connected to a
tN4 Thermostat network operating on a boiler bus. Indoor
temperature feedback fine tunes the water temperature of the
system based on the requirements of the thermostats. Each
thermostat tells the tN4 System Control the water temperature
that it requires to heat its zone.
Device Count (tN4)
The control includes a device count of all the tN4 devices
connected to each of the four buses. This item is always
found in the Toolbox Menu called BUS(#) DEV. Use this to
confirm that the correct number of devices are connected
to the boiler bus.
Scenes
The 284 will respond to the following tekmarNet® scenes:
Scene
1Occupied or Schedule
2 Away, operates Room at 62°F (16.5°C) & there
3Permanent Unoccupied
4Occupied or Schedule
5Occupied or Schedule
6 Temporary 3 hour Occupied
7 Temporary 3 hour Occupied
8 Temporary 3 hour Occupied
-------------------------------------------
Response
is no DHW heating
-------------------------------
--------------
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Important Safety Information
It is your responsibility to ensure that this control is safely installed according to all applicable codes and standards.
tekmar is not responsible for damages resulting from improper installation and/or maintenance.
To avoid serious personal injury and damage to the equipment:
Read Manual and all product labels BEFORE
•
using the equipment. Do not use unless
you know the safe and proper operation
of this equipment.
•
Keep this Manual available for easy access
by all users.
•
Replacement Manuals are available at
tekmarControls.com
Disconnect all power before opening the
•
control.
Installation
Radio Frequency Interference
The installer must ensure that this control & its wiring are
isolated &/or shielded from strong sources of electromagnetic
noise. Conversely, this Class B digital apparatus complies
with Part 15 of the FCC Rules & meets all requirements of
the Canadian Interference-Causing Equipment Regulations.
However, if this control does cause harmful interference to
radio or television reception, which is determined by turning
It is the installers responsibility to ensure that this control
•
is safely installed according to all applicable codes and
standards.
Improper installation and operation of this control could result
•
in damage to the equipment and possibly even personal
injury or death.
This electronic control is not intended for use as a primary
•
limit control. Other controls that are intended and certified
as safety limits must be placed into the control circuit.
Do not attempt to service the control. There are no user
•
serviceable parts inside the control. Attempting to do so
voids warranty.
the control off & on, the user is encouraged to try to correct
the interference by re-orientating or relocating the receiving
antenna, relocating the receiver with respect to this control,
&/or connecting the control to a different circuit from that to
which the receiver is connected.
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.
Installation Location
When choosing the location for the control, consider the
following:
Keep dry. Avoid potential leakage onto the control.
•
RH 90% to 104°F (40°C).
Non-condensing environment.
Do not expose to operating temperatures beyond 32-104°F
•
(0-40°C)
Provide adequate ventilation.
•
Keep away from equipment, appliances or other sources of
•
electrical interference.
Figure 1
tN4
tN4
tN4
Bus b
Bus 1
Bus 2
Boiler Boiler Boiler Boiler
32 33
34 35
36 37
75 76
77 78 79 80 81 82
Boiler 1
Boiler 2
Pump /
Pump /
Valve
Valve
WARNING
+
–––
C3C2C0 C1
tN4
Gnd
Alert
Auxiliary
BA
Bus 3
RS485
45 46
43 44
40 41
42
38 39
tektra 1056-01
Input Power:
115 V (ac) ±10%, 60 Hz, 18 VA
Primary Pump Relays:
230 V (ac), 10 A, 1/2 hp
Manual
I
Boiler & DHW Pumps:
230 V (ac), 5 A, 1/3 hp
Override
Boiler Stage, Auxiliary &
Alert Relays:
230 V (ac), 5 A, 1/6 hp
Calls: 24 V (ac) or Short
Signal wiring must be
rated at least 300 V.
Disconnect All Power
Designed and
Before Opening
assembled in Canada
85 8683 84
Boiler 3
Boiler 4
I
DHW
Power In
Pump /
Pump /
L N
Valve
Valve
Pump
71/8
”
(181 mm)
Screw hole
Dimensions
Flow Proof
Call
1
2
For product literature:
www.tekmarControls.com
Meets Class B: Canadian
ICES & FCC Part 15
H7019C
C.A. Proof
Call
34
1 2345
External Flow Proof / Off
External C.A. Proof / Off
Off / Exercise
Setback / Off
47 48
Primary Primary
++
+
I
DHW
Heat
Setpoint
20V
Out17Boil
DHW21Com22Vent
Boil 1
Boil 2
Com
Boil 3
Boil 4
ComCom
Boil
Boil
Sup
Out
Out
Out
23 24
65 66
Boiler 3
+
-
Mod Stage 1 Stage 2
In
103/16
Out
31
25
27
28
29
30
26
BACnet IP
Home
Boiler Control 284
Four tN4, BAS, Four Boiler, DHW & Setpoint
67 68 69 70
73 74
71 72
Boiler 4
+
-
Mod Stage 1 Stage 2
”
Call
Call
Call
7
56
910
8
49 50
51 52
Pump
Pump
+
-
Mod
P1
P2
Ret
dc5Vdc
Vdc
Gnd15mA
EMS
Com
Out In Out In In
11
18
14
12 13
16
19
20
Temperature Sensors - Do Not Apply Power tekmarNet Communication
Flow
Pressure
Sensor
Sensor
53 54
55 56
57 58
61 62 63 64
59 60
Boiler 2
Boiler 1
+
-
Stage 1 Stage 2
Mod Stage 1 Stage 2
(259 mm)
•
Provide easy access for wiring, viewing, & adjusting the
display screen.
•
Mount approximately 5 ft. (1.5 m) off the finished floor.
Locate the control near pumps &/or zone valves if possible.
•
Provide a solid backing to mount the enclosure to. For
•
example: plywood, studs, etc
Use the conduit knockouts provided on the upper, lower,
•
back & sides of the enclosure.
Figure 2
Ground
Screws
Wall or Panel Door
Custom Panel
or Electrical Box
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© 2014 284_D - 08/14
Page 23
Control Wiring
This section explains how to wire individual devices to the Boiler Control 284. For step by step wiring refer to the terminal
number on the right of the page.
Before wiring, ensure all power is turned off & take all
•
necessary precautions.
Install the supplied wiring compartment barriers by sliding
•
them into the grooves provided to isolate the low & high
voltage wiring.
Strip all wiring to a length of 3/8 in. or 10 mm for all
•
•
A circuit breaker or power disconnect that provides power to
the control should be located nearby & clearly labeled.
Refer to the current & voltage ratings at the back of this
•
brochure before connecting devices to this control.
Only qualified personnel should install or service the
•
control.
terminals.
Wiring the Input Power Terminals 83, 84
Provide a 15 Amp circuit for the input power.
Connect the 115 V (ac) line wire (L) to terminal 83.
•
Connect the neutral wire (N) to terminal 84.
•
Connect the ground wire (G) to one of the ground screws provided in the
•
wiring chamber.
Boiler
Control 284
L
G
N
83 84
Power In
L N
Wiring the Primary Pumps Terminals 47 to 50
Primary pumps requiring up to
terminals 47, 48 & 49, 50. If a single power source is used for multiple pumps,
ensure they are not tied together at any point between the pumps & the
control. For simplicity in wiring & troubleshooting, a separate breaker for
each pump is recommended.
For Primary Pump P1 connect the power source line wire (L) to terminal 47.
•
Connect a wire from terminal 48 to the pump L.
•
Connect a wire from the pump N back to the power source neutral.
•
For Primary Pump P2 connect the power source line wire (L) to terminal 49.
•
Connect a wire from terminal 50 to the pump L.
•
Connect a wire from the pump N back to the power source neutral.
•
Ensure grounds are connected in the pump & control wiring chambers.
•
230 V (ac) 10 A, 1/2 hp
can be switched through
Boiler
Control 284
L
N
G
L
N
L
N
G
47 48
Primary
Pump
P1
L
N
Ground
49 50
Primary
Pump
P2
Wiring the Boiler Pumps / Valves Terminals 75 to 82
Boiler pumps / valves requiring up to 230 V (ac) 5 A, 1/3 hp can be switched
through terminals 75 to 82. If a single power source is used for multiple
pumps, ensure they are not tied together at any point between the pumps
& the control. For simplicity in wiring & troubleshooting, a separate breaker
for each pump is recommended.
•
For the Boiler 1 Pump / Valve connect the power source line wire (L) or low
voltage (R) to terminal 75.
Connect a wire from terminal 76 to the device L or R (low voltage).
•
Connect the N or C (low voltage) back to the power source neutral.
•
Repeat for additional pumps using the Boiler 2 Pump / Valve to Boiler 4
•
Pump / Valve terminal sets (77 & 78), (79 & 80) & (81 & 82).
Ensure grounds are connected in the pump/valve & control wiring
•
chambers.
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R
C
C
R
75 76
Boiler 1
Pump/Valve
Boiler
Control 284
L
N
G
L
NG
© 2014 284_D - 08/14
75 76
Boiler 1
Pump/Valve
Ground
Page 24
Wiring an Indirect DHW Pump Terminals 85, 86
An indirect DHW pump requiring up to
through the IDHW Pump terminals.
Connect the line wire (L) to terminal 85.
•
Connect a wire from terminal 86 to the pump L.
•
Connect a wire from the pump N back to the power source neutral.
•
Ensure grounds are connected in the pump & control wiring chambers.
•
230 V (ac) 5 A, 1/3 hp
can be switched
Control 284
L
N
G
Boiler
L
NG
85 86
IDHW
Pump
Ground
Wiring a Combustion Air (C.A.) Damper / DHW Recirculation Pump Terminals 43, 44
A C.A. damper or DHW recirculation pump requiring up to
switched through the Auxiliary terminals.
Connect the line wire (L) or R (low voltage) to terminal
•
43.
Connect a wire from terminal 44 to the L or R on the
•
auxiliary device.
Connect the N (line voltage) or C (low voltage) back to
•
the power source neutral.
Ensure grounds are connected in the pump & control
•
wiring chambers.
230 V (ac) 5 A, 1/6 hp
C
R
C
R
Auxiliary
43 44
can be
C.A.
Damper
G
N
L
Control 284
L
N
Boiler
DHW
Recirculation
Pump
Auxiliary
43 44
Ground
Wiring an Alert Terminals 45, 46
An Alert Device requiring up to
terminals to provide notification of specific system events.
Connect the line wire L (line voltage) or R (low voltage) to terminal 46.
•
Connect a wire from terminal 45 to L or R on the alert device.
•
Connect the N (line voltage) or C (low voltage) back to the power source neutral.
•
230 V (ac) 5 A, 1/6 hp
can be switched through the Alert
L or R
N or C
Boiler
Control 284
Wiring a Flow Proof Terminals 1, 2
The 284 requires a closed switch or short for proof of flow. Up to 24 V (ac) can be passed through the
switch. If a flow proof device is being used, ensure the External Flow Proof / Off DIP switch on the front
of the control is set to the External Flow Proof position.
Connect the Flow Proof Call terminals 1 & 2 to the flow proof device.
•
If a flow sensor is being used as the flow proving device, a jumper must be placed across the
flow proof call terminals.
Boiler
Control 284
Wiring a Combustion Air (C.A.) Proof Terminals 3, 4
The 284 requires a closed switch or short for proof of combustion air. Up to 24 V (ac) can be passed
through the switch. If a combustion air proof device is being used, ensure the External C.A. Proof / Off
DIP switch on the front of the control is set to the External C.A. Proof position.
Connect the C.A. Proof Call terminals 3 & 4 to a combustion air proof.•
Boiler
Control 284
Alert
45 46
Flow Proof
Call
1
2
C.A. Proof
Call
34
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Page 25
Wiring a Heat Call Terminals 5, 6
The 284 requires a switched external heat call to operate the boiler plant unless calls for heat are generated through
a tekmarNet® device, EMS, BACnet® or Modbus® connection. The heat call can be volt free or up to 24 V (ac).
Connect the Heat Call terminals 5 & 6 to a switched heat demand.
•
Typical heat calls are from a zone relay box or thermostat.
•
A permanent heat call can be created by installing a jumper wire between terminals 5 & 6.
•
Boiler
Control 284
Wiring an Indirect DHW (IDHW) Call Terminals 7, 8
If the DHW sensor option is not used, a call for indirect domestic hot water can come from an aquastat connected
to terminals 7 & 8. The IDHW Call can be volt free or up to 24 V (ac).
Connect the IDHW Call terminals 7 & 8 to the DHW tank aquastat.•
Heat
Call
56
Boiler
Control 284
Wiring a Setpoint Call Terminals 9, 10
The Setpoint Call terminals 9 & 10 can receive a call for heat from a setpoint control or thermostat. The setpoint
call can be volt free or up to 24 V (ac).
Connect the Setpoint Call terminals 9 & 10 to the output terminals on a setpoint control or thermostat.•
Boiler
Control 284
Single Stage Boiler Wiring Terminals 53 to 72
A single stage condensing or non-condensing boiler is enabled through the T T contacts.
For Boiler 1 connect Stage 1 terminals 53 & 54 to the boiler TT contacts.
•
For Boiler 2 connect Stage 1 terminals 59 & 60 to the boiler TT contacts.
•
For Boiler 3 connect Stage 1 terminals 65 & 66 to the boiler TT contacts.
•
For Boiler 4 connect Stage 1 terminals 71 & 72 to the boiler TT contacts.
•
Boiler Control 284
51 52
53 54
Boiler 1
+
-
Mod
Stage 1 Stage 2
IDHW
Call
7
8
Setpoint
Call
910
55 56
TT
Stage 1
Two Stage Boiler Wiring Terminals 53 to 74
A two stage condensing or non-condensing boiler requires two wires for each stage.
For Boiler 1 connect Stage 1 terminals 53 / 54 & 55 / 56 to the boiler stage 1 & stage 2 contacts.
•
For Boiler 2 connect Stage 1 terminals 59 / 60 & 61 / 62 to the boiler stage 1 & stage 2 contacts.
•
For Boiler 3 connect Stage 1 terminals 65 / 66 & 67 / 68 to the boiler stage 1 & stage 2 contacts.
•
For Boiler 4 connect Stage 1 terminals 71 / 72 & 73 / 74 to the boiler stage 1 & stage 2 contacts.
•
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Boiler Control 284
51 52
53 54
Boiler 1
+
-
Mod
Stage 1 Stage 2
TT
Stage 1
55 56
TT
Stage 2
Page 26
--------------------------------------------------------------------------
Modulating Boiler Wiring Terminals 51 to 72
For modulating boilers that do not require an enable:
51 52
+
Mod
Mod
53 54
Boiler 1
-
Stage 1 Stage 2
TT+
Enable
•
The 284 provides either a 4-20 mA or a 0-10 V (dc) output to each boiler.
Polarity is important.
•
Connect the Mod + terminals from boilers 1, 2, 3 and 4 to the 284 terminals 51, 57, 63 and 69,
•
respectively.
Connect the Mod - terminals from boilers 1, 2, 3 and 4 to the 284 terminals 52, 58, 64 and 70,
•
respectively.
Some modulating boilers may also require an on / off signal in addition to the modulating
signal. See the Stage 1 terminals for boilers 1, 2, 3 and 4.
55 56
The 4 to 20 mA output can be converted to a 0 - 135 Ω output
for a Modutrol IV™ gas valve actuating motor using a 0 - 135 Ω
tekmar Converter 005 (sold separately).
Modutrol IV™
0 - 135
Actuating
Motor
Boiler
Control
284
Mod
B
R
W
+
-
Ω
Modutrol IV
tekmar
B
R
W
+
-
Modutrol IV™ and V9055™ are trademarks of Honeywell, Inc.
V9055
B
R
W
+
-
tekmar
Sensor Installation & Wiring
Mounting the Outdoor Sensor
The temperature sensor (thermistor) is built into the
sensor enclosure.
•
Remove the screw & pull the front cover off the
enclosure.
•
The sensor can either be mounted directly onto a wall or
a 2" x 4" electrical box. When the senor is wall mounted,
the wiring should enter through the back or bottom of
the enclosure. Do not mount the sensor with the conduit
knockout facing upwards as rain could enter the enclosure
& damage the sensor.
--------------------------------------------------------------------------
The 4 to 20 mA output can be converted to a 0 - 135 Ω output
for a V9055™ gas valve actuating motor using a 0 - 135 Ω
tekmar Converter 005 (sold separately).
Modutrol IV
B
R
W
+
-
tekmar
•
In order to prevent heat transmitted through the wall from
V9055
B
R
W
+
-
tekmar
Mod
B
R
W
+
-
V9055™
0 - 135
Actuating
Motor
Boiler
Control
284
Ω
affecting the sensor reading, it may be necessary to install
an insulating barrier behind the enclosure.
•
The Outdoor Sensor should be mounted on a wall which
best represents the heat load on the building (a northern
wall for most buildings & a southern facing wall for buildings
with large south facing glass areas). The sensor should not
be exposed to heat sources such as ventilation or window
openings.
•
The sensor should be installed at an elevation above the
ground that will prevent accidental damage or tampering.
Sensor with rear
entry wiring
A Watts Water Technologies Company
Sensor with bottom
entry wiring
26 of 60
Sensor mounted
onto 2" x 4"
electrical box
© 2014 284_D - 08/14
Page 27
-----------------------------------------------------------------------
Wiring the Outdoor Sensor (tekmar 070) Terminals 17, 19
Connect 18 AWG or similar wire to the two terminals provided
•
in the enclosure & run the wires from the sensor to the
control. Do not run the wires parallel to telephone or power
cables. If the sensor wires are located in an area with strong
sources of electromagnetic interference (EMI), shielded
cable or twisted pair should be used or the wires can be
run in a grounded metal conduit. If using shielded cable,
the shield wire should be connected to the Com terminal
on the control & not to earth ground.
•
Replace the front cover of the sensor enclosure.
•
Connect one wire from the outdoor sensor to the Out terminal
17 on the 284.
Mounting the Universal Sensors
-----------------------------------------------------------------------
These sensors are designed to mount on a pipe or in a
temperature immersion well.
The Universal Sensor should be placed downstream of a pump
or after an elbow or similar fitting. This is especially important
if large diameter pipes are used as the thermal stratification
within the pipe can result in erroneous sensor readings. Proper
sensor location requires that the fluid is thoroughly mixed within
the pipe before it reaches the sensor.
Strapped to Pipe
The Universal Sensor can be strapped directly to the pipe
using the cable tie provided. Insulation should be placed
around the sensor to reduce the effect of air currents on the
sensor measurement.
Connect the second wire to the Com terminal 19.•
Wires from outdoor
sensor to control’s
outdoor sensor and
sensor common
terminals
Out
Boil
Com
Sup
(-)
Sensor is built into
the enclosure
17
No Power
18
19
diameter pipes are used & fluid stratification is present. If the
well is not a snug fit on the sensor tube, use the heat transfer
paste supplied with the product. Apply paste to the sides of the
sensor and place a pea-sized globule on the sensor tip. Push
the sensor into the well and when it bottoms out, press firmly.
The paste will be forced up the sides of the well.
Conduit Connection
The Universal Sensor & Universal Sensor Enclosure 080 (sold
separately) are specifically designed to mount onto a 3/8” (10
mm) ID temperature well that is supplied with an end groove.
To install the well, plumb a ‘T’ into the pipe & fix the well into
the ‘T’. The 080 enclosure has a 7/8” (22 mm) back knockout
that must be removed & fitted over the temperature well. The
Universal Sensor is then inserted into the well & the retaining
clip supplied with the enclosure is snapped onto the well end
groove. If the well has a threaded end, the installer must supply
a standard threaded conduit retaining ring. The two wires from
the sensor are connected to the terminal block provided in
the enclosure. The other side of the terminal block is used to
connect wires from the control.
Retaining
Clip
Immersion Well
If a Universal Sensor is mounted onto 1” (25 mm) diameter L
type copper pipe, there is approximately an 8 second delay
between a sudden change in water temperature & the time
Universal
Sensor
Bottom of
Enclosure 080
Universal
Sensor
the sensor measures the temperature change. This delay
increases considerably when mild steel (black iron) pipe is
used. In general, it is recommended that a temperature well
be used for steel pipe of diameter greater than 1-1/4” (32
mm). Temperature wells are also recommended when large
Sensor
Well
Cable Tie
Wiring Boiler Outlet Sensors (tekmar 082) Terminals 26 to 31
Up to 4 boiler outlet sensors can be wired to the 284. These connections are not polarity sensitive.
•
Connect one wire from the outlet sensor for boiler 1 to the Boil 1 Out terminal 26.
•
Connect the second wire from the outlet sensor for boiler 1 to the Com terminal 28.
•
Repeat for additional boiler outlet sensors using terminal sets 27 & 28, 29 & 31, 30 & 31.
Boil 2
Out
27
Boil 3
Com
Out
29
28
No Power
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Boil 1
Out
26
© 2014 284_D - 08/14
Boil 4
Out
30
Com
31
Page 28
Wiring a Boiler Inlet Sensor (tekmar 082) Terminals 24, 25
A single boiler inlet sensor measures the water temperature entering the boilers.
Connect one wire from the boiler inlet sensor to the Boil In terminal 24.
•
Connect the second wire to the Com terminal 25.
•
Vent
23 24 25
Wiring a Boiler Supply Sensor (tekmar 082) Terminals 18, 19
A boiler supply sensor measures the temperature of water coming from the boiler plant. This sensor should
be installed on the supply pipe ahead of the tees supplying any loads.
Connect one wire from the boiler supply sensor to the Boil Sup terminal 18.
•
Connect the second wire to the Com terminal 19.
•
Out
17
Wiring a Boiler Return Sensor (tekmar 082) Terminals 20, 22
Boil
In
No Power
Boil
Sup
18
No Power
Com
Com
(-)
19
A boiler return sensor measures the temperature returning to the boiler plant. This sensor can be installed
on the return side of the primary loop, ahead of the boiler plant piping.
Connect one wire from the boiler return sensor to the Boil Ret terminal 20.
•
Connect the second wire to the Com terminal 22.
•
Boil
Ret
20
Wiring a DHW Sensor (tekmar 082) Terminals 21 to 22
A DHW sensor is used to measure the temperature of a DHW tank. For indirect DHW heating, the DHW sensor
can be used instead of a DHW aquastat. For direct DHW heating, only the DHW sensor can be used to control the
temperature of the DHW tank.
Connect one wire from the DHW sensor to the DHW terminal 21.
•
Connect the second wire to the Com terminal 22.
•
Boil
Ret
20
Wiring a Flow Sensor Terminals 11, 12
DHW
21
No Power
DHW
21
No Power
Com
22
Com
22
An analog flow sensor can be connected to the 284 to provide flow monitoring. The control supports a
4-20 mA style sensor. Examples of compatible aftermarket flow sensors include the Kele SDI series, 2200
& 3100 series and 200 series (requires 310 transmitter). Using the boiler supply sensor & the boiler return
sensor, energy output can be calculated & displayed from the flow measurement. The flow sensor can also
be used to prove primary pump flow.
Connect one wire from the flow sensor to the 20 V dc Out terminal 11.
•
Connect the second wire to mA (+) In terminal 12.
•
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© 2014 284_D - 08/14
20V
20V
dc
Out In
11
Flow
Sensor
mA
mA
(+)
12
Page 29
Wiring a Pressure Sensor Terminals 13 to 15
An analog pressure sensor can be connected to the 284 to provide water pressure monitoring. The
control supports a V (dc) style pressure sensor with a signal range of 0.5 to 4.5 V (dc). Examples
of compatible aftermarket pressure sensors include the Honeywell PX2 (AA) series and the
Measurement Specialties 7100 series.
Connect one wire from the power supply (+5 VDC) on the pressure sensor to the 5V dc Out
•
terminal 13.
Connect one wire from the pressure signal on the pressure sensor to the Vdc (+) In terminal 14.
•
Connect one wire from the GND (0V) on the pressure sensor to the Gnd (-) terminal 15.
•
Out
Wiring a Vent Sensor Terminals 23, 25
A vent sensor can be connected to the 284 to provide monitoring of the common boiler plant exhaust vent temperature.
Compatible sensors include a 10K ohm NTC curve J thermistor.
to 500°F (260°C).
Connect one wire from the vent sensor to the Vent terminal 23.
•
Connect the second wire to the Com terminal 25.
•
The vent sensor can also be used to provide a vent temperature limiting feature.
The control is capable of displaying temperatures up
Vent
23 24 25
EMS, Modbus® & BACnet® Connections
5V
Vdc
dc
14
13
Pressure
Sensor
Boil
In
No Power
+
-
Gnd
In
15
Com
EMS Connection Terminals 16, 19
An Energy Management System (EMS) can be connected to the 284 to provide a target water
temperature. Either a 0 to 10 V (dc) or 2 to 10 V (dc) signal may be used.
Connect one wire from the EMS to the EMS (+) In terminal 16.
•
•
Connect a second wire from the EMS to the Com (-) terminal 19.
A 0 - 20 mA signal can be converted to a 0 - 10 V (dc) signal by installing a 500 resistor in
parallel between the Com (-) & EMS (+) In terminals (19 & 16). The EMS Signal setting must
be set to 0-10.
EMS
In
16
+
Out
17
No Power
Boil
Sup
18
Com
19
-
-
EMS
+
A 4 - 20 mA signal can be converted to a 2 - 10 V (dc) signal by installing a 500 resistor in parallel between the Com (-) &
EMS (+) In terminals (19 & 16). The EMS Signal setting must be set to 2-10.
The APP MODE setting in the Setup Menu must be set to EMS.
Modbus® Connection Terminals 40 to 42
A Building Automation System (BAS) can be connected to the 284 for remote monitoring
& adjustment capability. Modbus® communications use an RS 485 connection. Use
18 AWG Twisted Shielded Pair cable. Cable length is dependent on the baud rate &
whether or not terminating resistors are used. Refer to the BAS Integration Manual
284_B for details on the maximum recommended cable length.
•
Connect the B (+) terminal on the BAS network to the RS 485 B (+) terminal 40.
•
Connect the A (-) terminal on the BAS network to the RS 485 A (-) terminal 41.
•
Connect the ground (G) terminal on the BAS network to the Gnd terminal 42.
+–
BA
Gnd
RS 485
40 41 42
284
BAG
(-)
(+)
Master
BACnet® Connection RJ45 Plug
A Building Automation System (BAS) can be connected to the 284 for remote
monitoring & adjustment capability. BACnet® IP communications use an
ethernet socket. Use a CAT-5E or CAT-6 cable. The maximum recommended
cable length for CAT-5E is
•
Connect the Ethernet RJ45 socket on the BACnet® IP network to the
150 ft. (45.7 m)
&
300 ft. (91.4 m)
for CAT-6.
Ethernet RJ45 socket on the 284.
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Boiler
Control 284
© 2014 284_D - 08/14
BACnet
Network
Switch
Page 30
Wiring the tekmarNet® Devices
tN4 Boiler Bus b Terminals 32 - 33
Terminals 32 & 33 provide communication for tN4 devices on the tN4 Boiler Bus b. Connect terminals 32 (tN4) & 33 (C0) to the
corresponding terminals on the tN4 devices that are to be connected.
The connection is polarity sensitive. Ensure that terminal 32 (tN4) is connected to the tN4 terminal on the tN4 device &
that terminal 33 (C0) is connected to the C terminal on the tN4 device.
tN4 Boiler Bus 1 Terminals 34 - 35
Terminals 34 & 35 provide communication for tN4 devices on the tN4 Boiler Bus 1. Connect terminals 34 (tN4) & 35 (C1) to the
corresponding terminals on the tN4 devices that are to be connected.
The connection is polarity sensitive. Ensure that terminal 34 (tN4) is connected to the tN4 terminal on the tN4 device &
that terminal 35 (C1) is connected to the C terminal on the tN4 device.
tN4 Boiler Bus 2 Terminals 36 - 37
Terminals 36 & 37 provide communication for tN4 devices on the tN4 Boiler Bus 2. Connect terminals 36 (tN4) & 37 (C2) to the
corresponding terminals on the tN4 devices that are to be connected.
The connection is polarity sensitive. Ensure that terminal 36 (tN4) is connected to the tN4 terminal on the tN4 device &
that terminal 37 (C2) is connected to the C terminal on the tN4 device.
tN4 Boiler Bus 3 Terminals 38 - 39
Terminals 38 & 39 provide communication for tN4 devices on the tN4 Boiler Bus 3. Connect terminals 38 (tN4) & 39 (C3) to the
corresponding terminals on the tN4 devices that are to be connected.
The connection is polarity sensitive. Ensure that terminal 38 (tN4) is connected to the tN4 terminal on the tN4 device &
that terminal 39 (C3) is connected to the C terminal on the tN4 device.
Testing the Sensor Wiring
A good quality test meter capable of measuring up to 5,000 kΩ
(1 kΩ = 1000 Ω) is required to measure the sensor resistance. In
addition to this, the actual temperature must be measured with
either a good quality digital thermometer, or if a thermometer
is not available, a second sensor can be placed alongside the
one to be tested & the readings compared.
First measure the temperature using the thermometer & then
measure the resistance of the sensor at the control. The wires
from the sensor must not be connected to the control while the
test is performed. Using the chart below, estimate the temperature
TemperatureResistanceTemperatureResistanceTemperatureResistanceTemperatureResistance
°F °C °F °C °F °C °F °C
-50 -46 490,813 20 -7 46,218 90 32 7,334 160 71 1,689
-45 -43 405,710 25 -4 39,913 95 35 6,532 165 74 1,538
-40 -40 336,606 30 -1 34,558 100 38 5,828 170 77 1,403
-35 -37 280,279 35 2 29,996 105 41 5,210 175 79 1,281
-30 -34 234,196 40 4 26,099 110 43 4,665 180 82 1,172
-25 -32 196,358 45 7 22,763 115 46 4,184 185 85 1,073
-20 -29 165,180 50 10 19,900 120 49 3,760 190 88 983
-15 -26 139,403 55 13 17,436 125 52 3,383 195 91 903
-10 -23 118,018 60 16 15,311 130 54 3,050 200 93 829
-5 -21 100,221 65 18 13,474 135 57 2,754 205 96 763
0 -18 85,362 70 21 11,883 140 60 2,490 210 99 703
5-15 72,918 7524 10,501 14563 2,255 215102 648
10 -12 62,465 80 27 9,299 150 66 2,045 220 104 598
15 -9 53,658 85 29 8,250 155 68 1,857 225 107 553
measured by the sensor. The sensor & thermometer readings
should be close. If the test meter reads a very high resistance,
there may be a broken wire, a poor wiring connection or a
defective sensor. If the resistance is very low, the wiring may
be shorted, there may be moisture in the sensor or the sensor
may be defective. To test for a defective sensor, measure the
resistance directly at the sensor location.
Do not apply voltage to a sensor at any time as damage
to the sensor may result.
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Testing the Control Wiring
-----------------------
---------------------------
-----------------------
------------------
-----------------------
-------------
-----------
Testing the Power Terminals 83 & 84
If the control display does not turn on, check the Power In L & N terminals (83 & 84) using an electrical multimeter. The voltage
should measure between 103.5 to 126.5 V (ac).
User Test (HAND) Manual Override Button
The User Test (HAND mode) is one of the Manual Override
modes of the control. Refer to the Hand mode for a description
of the steps that are included to operate the outputs. The steps
are dependent how the boiler(s) (Source # Menu) & the system
(Setup menu) are configured.
Manual
Override
Testing the Auxiliary Relay
Activate the HAND mode within the Manual Override. Select the
Auxiliary item & set it to ON. Using an electrical meter, measure
for continuity between the Auxiliary terminals (43 & 44).
Testing the Alert Relay
Activate the HAND mode within the Manual Override. Select
the Alert item & set it to ON. Using an electrical meter, measure
for continuity between the Alert terminals (45 & 46).
Testing the Primary Pumps
Activate the HAND mode within the Manual Override.
For primary pump 1, select the Primary Pump item & set it
to PMP1. Using an electrical meter, measure for continuity
between the Primary Pump 1 terminals (47 & 48).
For primary pump 2, select the Primary Pump item & set it
to PMP2. Using an electrical meter, measure for continuity
between the Primary Pump 2 terminals (49 & 50).
Testing the Indirect DHW Pump
Activate the HAND mode within the Manual Override. Select
the DHW Pump item & set it to ON. Using an electrical meter,
measure for continuity between the IDHW Pump terminals
(85 & 86).
-----------------------
---------------------------
-----------------------
------------------
Testing the Boiler Pump(s) / Isolation Valve(s)
Activate the HAND mode within the Manual Override.
For a boiler pump, select the Boil 1 PUMP item & set it to ON.
Using an electrical meter, measure for continuity between the
Boiler 1 Pump / Valve terminals (75 & 76).
For an isolation valve, select the Boil 1 VALVE item & set it
to ON. Using an electrical meter, measure for an open circuit
between the Boiler 1 Pump / Valve terminals (75 & 76).
Repeat the steps above for Boiler Pumps 2, 3 & 4.
Testing the Boiler Stage(s)
This test applies for single stage & two stage boilers only.
Activate the HAND mode within the Manual Override.
single stage boiler, select the Boil STG item & set it to 1.
Using an electrical meter, measure for continuity between the
Boiler 1 Stage 1 terminals (53 & 54).
For a two stage boiler, select the Boil STG item & set it to 1.
Using an electrical meter, measure for continuity between the
Boiler 1 Stage 1 terminals (53 & 54). Set the Boil STG item to
2. Using an electrical meter, measure for continuity between
the Boiler 1 Stage 2 terminal (55 & 56).
Repeat the steps above, as applicable, for Boilers 2, 3 & 4.
Testing the Modulating Boiler Output
This test applies for modulating boilers only.
Activate the HAND mode within the Manual Override.
Select the Boil 1 MOD item & set a desired firing rate.
Using an electrical meter, measure for either a V (dc) or
mA signal between the Boiler + Mod - terminals (51 & 52).
The reading should be between 0 V (dc) & 10 V (dc) or 4
mA & 20 mA.
Repeat the steps above for Boilers 2, 3 & 4.
Testing the Temperature Boiler Output
This test applies for EMS boilers only. Activate the HAND
mode within the Manual Override.
Select the Boil 1 TEMP item & set a desired temperature
between the EMS TEMP MIN and EMS TEMP MAX values.
Using an electrical meter, measure for either a V (dc) or
mA signal between the Boiler + Mod - terminals (51 & 52).
The reading should be between 0 V (dc) & 10 V (dc) or 4
mA & 20 mA.
Repeat the steps above, as applicable, for Boilers 2, 3 & 4.
-----------------------
For a
-------------
-----------
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Testing the Heat Call Terminals 5 & 6
Set the Application Mode to RSET. Remove all wires from
the Heat Call terminals (5 & 6). The control display should
show no Heat Call. Reconnect wires. Then apply either a
short circuit or 24 V (ac) over the Heat Call terminals. The
control should now show a Heat Call.
Testing the DHW Call Terminals 7 & 8
Set the Application Mode to either RSET, SETP or EMS.
Remove all wires from the DHW Call terminals (7 & 8). The
control display should show no DHW Call. Reconnect wires.
Then apply either a short circuit or 24 V (ac) over the DHW
Call terminals. The control should now show a DHW Call.
Testing the Setpoint Call Terminals 9 & 10
Set the Application Mode to either RSET, SETP or EMS.
Remove all wires from the Setpoint Call terminals (9 & 10).
The control display should show no Setpoint Call. Reconnect
wires. Then apply either a short circuit or 24 V (ac) over
the Setpoint Call terminals. The control should now show
a Setpoint Call.
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Control Settings
Access Level
The access level restricts the number of menus & items that
can be accessed by the user. The Access Level setting is
found in the Toolbox menu. Select the appropriate access
level for the people who work with the control on a regular
basis. There are three Access Level settings:
User (USER): Select this access level to limit the number
•
of items available to the end user.
•
Installer (INST): Select this access level to limit some of the
items available to the installer. This is the factory default
access level. The 284 defaults to the ‘Installer’ access
level after 24 hours.
Advanced (ADV): Select this access level to have complete
•
access to all of the items.
The Lock / Unlock switch on the front of the control must
be set the Unlock position to change the access level.
DIP Switch Settings
DIP Description Default
Unlocked
Off
Off
Exercise
Off
External Flow Proof / Off
External C.A. Proof / Off
Off / Exercise
Setback / Off
Lock / Unlock & Access Levels
Use this DIP switch to lock & unlock the Access Level of the 284 & all connected
tN4 devices, including tN4 thermostats. For details, see above.
Once unlocked, the access level can be changed in the Toolbox menu.
•
•
Once locked, the access level in all devices cannot be viewed or
changed.
•
When the control is locked a small segment representing a padlock is show
in the display.
External Flow Proof / Off
Use this DIP switch to select whether or not the Flow Proof Feature is to be
used.
If the Flow Proof feature is being used, set the DIP switch to the External
•
Flow Proof position. The control must receive an external Flow Proof Call
within a period of time once a primary pump is turned on.
If the Flow Proof feature is not being used, set the DIP switch to the Off
•
position.
The flow proof call feature can only be used when the control is
•
configured to operate the primary pump for all loads. If there are
multiple loads (e.g. Heat Call and DHW Call) and the primary pump
is disabled for DHW operation, then the control cannot provide flow
proving and the feature must be disabled. In this case, the flow proof
feature must be obtained through another control such as the Pump
Sequencer 132.
External C.A. Proof / Off
Use this DIP switch to select whether or not the C.A. Proof Feature is to be
used.
If the C.A. Proof feature is being used, set the DIP switch to the External
•
C.A. Proof position. The control must receive an external C.A Proof Call
within a period of time once the C.A. damper is turned on.
If the C.A. Proof feature is not being used, set the DIP switch to the Off
•
position.
Off / Exercise
Use this DIP switch to select whether or not the control is to exercise all pumps
for 10 seconds every three days of inactivity.
Setback / Off
Use this DIP switch to select whether or not the control is to follow a
schedule.
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User Interface
Display
Menu Field
Displays the
current menu
Status Fields
Displays the current
status of the control’s
inputs, outputs &
operation. Most
symbols in the status
field are only visible
when the VIEW Menu
is selected
Item Field
Displays the name of
the selected item
Boiler 1 Boiler 2 Boiler 3 Boiler 4
Boiler Output Status Fields
Number Field
Displays the current value
of the selected item
Buttons
Use for navigation
& adjustment
Home Button
Hold for 3 seconds
to access menu
selections
Symbols
Heat, DHW,
Setpoint
Prim 12
DHW
Alert
Aux
Occ 1, UnOcc 1,
Occ 2, UnOcc 2
CALLS
Displays any call the control is
receiving.
PRIMARY PUMP
Displays when primary pump 1 or
primary pump 2 is operating.
DHW PUMP
Displays when the DHW pump is
operating.
ALERT
Displays if an error or warning exists.
AUXILIARY
Displays when the C.A. damper or
DHW recirculation pump is operating.
OCC1, UNOCC1, OCC2, UNOCC2
Displays the current event of a
schedule.
tekmarNet
The 284 is communicating with other
tekmarNet
®
®
devices.
°F, °C, AM, PM, min,
hr, m3/h, gpm, kWh,
%, MBtu, psi, kPa
1
Boiler
1
°F, °C, AM, PM...
Units of measurement for current
number.
WARNING
Displays if an error or warning exists
on the system.
BOILER PUMP / VALVE
Displays when a boiler 1 pump / valve is
operating.
BOILER
Indicates that the boiler 1 is operating
(flashing icon indicates boiler is
igniting).
BOILER OUTPUT
Displays output of boiler 1. Dependent
on boiler type.
boiler is off.
Single stage: 100% (On)
•
Two stage: 50% (stage 1 On), 100%
•
(stage 2 On)
Modulating: current modulation %
•
•
EMS = current setpoint temperature
“--” is displayed when the
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Navigating The Display
The menu items of the 284 are described in detail in the following pages. The number of available items changes depending on
the control configuration. To find out what other settings affect the display of an item, refer to the menu descriptions.
View Menu
(default display)
Press
& hold
Navigate
available
menus
Setup
Source 1
Source 2
Enter
selected
menu
Navigate
available
items
Change
item
setting
Press
once
Press
twice
Source 3
Source 4
Monitor
Monitor 1
Monitor 2
Monitor 3
Monitor 4
Schedule
Time
BAS
Toolbox
View Menu (1 of 2)
The View Menu includes general information about boiler & pump operation, calls & temperatures. The View Menu is the default
display of the 284.
Item Field Range Description
Access: User
---, -76 to 149°F
(-60.0 to 65.0°C)
Access: User
---, -22 to 266°F
(-30 to 130°C)
Access: User
---, -22 to 266°F
(-30 to 130°C)
Access: ADV
---, -22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
---, -22 to 266°F
(-30.0 to 130.0°C)
Access: User
TIME
Current date & time.
This item is only available when the Setback / Off switch is set to Setback & Clock
(Time menu) is set to ON.
OUTDOOR
Current outdoor temperature as measured by the outdoor sensor. “----” is displayed
if there is a sensor fault.
This item is only available when Application Mode is set to RSET or an outdoor
sensor is connected.
BOILER SUPPLY
Current boiler supply water temperature as measured by the boiler supply sensor.
“----” is displayed if there is a sensor fault.
BOILER TARGET
The boiler target is the temperature the control is trying to maintain at the boiler supply
sensor. “----” is displayed when no heat is required.
INDIRECT DHW EXCHANGE TEMPERATURE
The indirect DHW exchange target is the temperature the control is trying to
maintain at the boiler 4 outlet sensor. “----” is displayed when no heat is required.
This item is only available if Application Mode is set to RSET, SETP or EMS, IDHW
Mode is set to ON & IDHW Location is set to NEAR.
INDIRECT DHW
Current indirect DHW tank temperature as measured by the DHW sensor. “----” is
displayed if there is a sensor fault.
This item is only available if Application Mode is set to RSET, SETP or EMS, IDHW
Mode is set to ON & IDHW Sensor is set to ON.
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View Menu (2 of 2)
Item Field Range Description
---, -22 to 266°F
(-30.0 to 130.0°C)
Access: User
---, -22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
-22 to 266°F
(-12.0 to 148.0°C)
Access: ADV
---, -40 to 500°F
(-40.0 to 260.0°C)
Access: ADV
GPM or m³/h
Access: ADV
MBtu/h or kW
Access: ADV
DEDICATED DHW
Current dedicated DHW tank temperature as measured by the DHW sensor. “----” is
displayed if there is a sensor fault.
This item is only available if Application Mode is set to DDHW.
BOILER RETURN
Current boiler return water temperature as measured by the boiler return sensor. “----”
is displayed if there is a sensor fault.
This item is only available if a boiler return sensor is connected.
BOILER SUPPLY DIFFERENTIAL
Current temperature difference between the boiler supply & boiler return sensors.
This item is only available if boiler supply & boiler return sensors are connected.
VENT TEMPERATURE
Current vent temperature of the boiler plant. “----” is displayed if there is a sensor
fault.
This item is only available if a vent sensor is connected.
FLOW RATE
Current flow rate as measured by the flow sensor.
This item is only available if Flow Sensor is set to ON.
BOILER LOAD
Current boiler plant output.
This item is only available if Flow Sensor is set to ON & if boiler supply & boiler return
sensors are connected.
psi or kPa
Access: ADV
---, -22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
---, -22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
-22 to 266°F
(-12.0 to 148.0°C)
Access: ADV
PRESSURE
Current system pressure as measured by the pressure sensor.
This item is only available if Pressure Sensor is set to ON.
BOILER INLET TEMPERATURE
Current boiler inlet water temperature.
This item is only available if a boiler inlet sensor is connected.
BOILER (#) OUTLET SENSOR
Current boiler outlet temperature of boiler 1.
This item is available for all enabled boilers provided their respective boiler outlet
sensor is connected.
BOILER (#) TEMPERATURE DIFFERENTIAL
Current temperature difference between the boiler 1 outlet & boiler inlet sensors.
This item is available for all enabled boilers provided their respective boiler outlet
sensor & the common boiler inlet sensor are connected.
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Setup Menu (1 of 6)
Setup Menu items are used for system specific configuration.
Item Field Range Description
RSET, SETP, DDHW,
EMS, BAS
Default = RSET
Access: INST
35 to 100°F
(2.0 to 38.0°C)
Default = 70°F (21.0°C)
Access: INST
35 to 100°F
(2.0 to 38.0°C)
Default = 65°F (18.5°C)
Access: INST
OFF, 0:20 to 8:00 hrs
Default: OFF
Access: ADV
-60 to 45°F
(-51.0 to 7.0°C)
Default: 10°F (-12.0°C)
Access: INST
APPLICATION MODE
RSET = Outdoor Temperature Reset
SETP = Setpoint Heating
DDHW = Dedicated DHW Heating
EMS = Energy Management System
BAS = Building Automation System
ROOM OCCUPIED
The desired room air temperature during the occupied periods.
This item is only available if the Application Mode is set to RSET.
ROOM UNOCCUPIED
The desired room air temperature during the unoccupied periods.
This item is only available if the Application Mode is set to RSET, Setback / Off
switch is set to Setback & a schedule is selected.
BOOST
The maximum amount of morning boost when change from the unoccupied to
the occupied period.
This item is only available if the Application Mode is set to RSET & the Setback
/ Off switch is set to Setback.
OUTDOOR DESIGN
The design outdoor air temperature used in the heat loss calculations for the
space heating system. Typically set to the outdoor temperature of the coldest
day of the year.
This item is only available if the Application Mode is set to RSET.
HRF1, HRF2, COIL,
CONV, RAD, BASE
Default: CONV
Access: INST
35 to 100°F
(2.0 to 38.0°C)
Default: 70°F (21.0°C)
Access: ADV
70 to 230°F
(21.0 to 110.0°C)
Default: 180°F (82.0°C)
Access: ADV
0-10 or 2-10
Default: 0-10
Access: ADV
-10 to 10°F
(-5.5 to -5.5°C)
Default: 0°F (0.0°C)
Access: ADV
TERMINAL UNIT
The type of terminal units that are being used for the space heating system.
Selection includes: high mass radiant floor (HRF1), low mass radiant floor
(HRF2), fancoil (COIL), fin-tube baseboard (CONV), radiator (RAD) & cast iron
baseboard (BASE).
This item is only available if the Application Mode is set to RSET.
BOILER INDOOR
The design indoor air temperature used in the heat loss calculations for the space
heating system.
This item is only available if the Application Mode is set to RSET.
BOILER DESIGN
The supply water temperature required for the space heating system on the typical
coldest day of the year.
This item is only available if the Application Mode is set to RSET.
EMS SIGNAL
Selects the analog input signal range used with the Energy Management System
(EMS).
This item is only available if the Application Mode is set to EMS.
EMS OFFSET
Selects the offset from the boiler target temperature interpreted from the EMS
analog input signal.
This item is only available if the Application Mode is set to EMS.
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Setup Menu (2 of 6)
Item Field Range Description
OFF, 60 to 180°F
(OFF, 15.5 to 82.0°C)
Default: 140°F (60.0°C)
Access: ADV
90 to 225°F, OFF
(32.0 to 107.0°C, OFF)
Default: 200°F (93.0°C)
Access: ADV
PUMP or VALV
Default: PUMP
Access: ADV
AUTO, 2 to 42°F
AUTO, 1.0 to 23.5°C
Default: AUTO
Access: ADV
OFF, DMPR, DHWR
Default: OFF
Access: ADV
BOILER MINIMUM
The minimum allowed boiler target temperature used for the non-condensing
boiler group. Check the boiler manufacturer’s manual for recommended minimum
boiler supply temperatures.
This item is only available if there is at least one boiler set to auto
(Boiler Enable = AUTO) & non-condensing (Boiler Condense = NO).
BOILER MAXIMUM
The maximum allowed boiler target temperature.
PLANT FLOW
Selects whether each boiler is to use a pump or valve.
BOILER DIFFERENTIAL
The temperature differential that the control is to use to cycle the boiler On & Off
(half above & half below the boiler target temperature).
This item is only available if Application Mode is set to either RSET, SETP, EMS
or BAS.
AUXILIARY RELAY
Selects the operation of the auxiliary relay to be either Combustion Air Damper
(DMPR) or DHW Recirculation Pump (DHWR).
If the External C.A. Proof / Off switch is set to External C.A. Proof, this setting is
fixed at DMPR.
OFF or AUTO
Default: AUTO
Access: ADV
OFF or AUTO
Default: OFF
Access: ADV
12 to 180 hr, OFF
Default: 96 hr
Access: ADV
OFF, 0:10 to 20:00 min
Default: 0:20 min
Access: ADV
0:10 to 3:00 min
Default: 0:30 min
Access: ADV
PRIMARY PUMP 1
Selects whether primary pump 1 is operational or not.
This item is only available if Application Mode is set to either RSET, SETP, EMS
or BAS.
PRIMARY PUMP 2
Selects whether primary pump 2 is operational or not.
This item is only available if Application Mode is set to either RSET, SETP, EMS
or BAS.
ROTATE PRIMARY PUMPS
Sets the frequency of rotation of the primary pumps.
This item is only available if Application Mode is set to either RSET, SETP, EMS
or BAS & Primary Pump 1 & Primary Pump 2 is set to AUTO.
PRIMARY PUMP PURGE
Time the primary pump remains on once the appropriate calls (heat, setpoint or
DHW) are removed to purge heat from the boiler plant.
This item is only available if Application Mode is set to either RSET, SETP, EMS
or BAS & Primary Pump 1 or Primary Pump 2 is set to AUTO.
FLOW PROOF DELAY
The time allowed for the control to receive a flow proof call once the primary
pump turns on.
This item is only available if the External Flow Proof / Off switch is set to External
Flow Proof.
0:10 to 3:00 min
Default: 1:00 min
Access: ADV
A Watts Water Technologies Company
CA PROOF DELAY
The time allowed for the control to receive a C.A. proof call once the C.A. damper
(Aux) relay turns on.
This item is only available if the External C.A. Proof / Off switch is set to External
C.A. Proof.
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Setup Menu (3 of 6)
Item Field Range Description
OFF, 0:10 to 3:00 min
Default: 1:00 min
Access: ADV
150 to 350°F, OFF
(65.5 to 177.0°C)
Default: OFF
Access: ADV
AUTO, 0:30 to 40:00
min
Default: AUTO
Access: ADV
SEQ or PAR
Default: PAR
Access: ADV
SEQ, PAR
Default: SEQ
Access: ADV
LHLH or LLHH
Default: LHLH
Access: ADV
LHLH or LLHH
Default: LHLH
Access: ADV
CA DELAY
The time delay for the first boiler to operate once the C.A. damper (Aux) relay
turns on.
This item is only available if the External C.A. Proof / Off switch is set to Off &
Auxiliary Relay is set to DMPR.
VENT MAXIMUM
The maximum vent temperature that is used for vent temperature limiting. The
boiler plant will be shut down if the vent temperature rises to the vent maximum
temperature. Set to OFF if only vent temperature monitoring is desired.
STAGE DELAY
The minimum time delay between the operation of boiler stages, either within a
boiler or between boilers.
This item is only available if there are at least two boilers set to auto
(Boiler Enable = AUTO).
MODULATION MODE CONDENSING
Selects either sequential or parallel modulation for multiple modulating condensing
boilers.
This item is only available if there are at least two boilers set to auto (ENABLE=AUTO),
condensing (Boiler Condense = YES) & Modulating (Boiler Type = MOD or
EMS).
MODULATION MODE NON-CONDENSING
Selects either sequential or parallel modulation for multiple modulating noncondensing boilers.
This item is only available if there are at least two boilers set to auto (Boiler Enable
= AUTO), non-condensing (Boiler Condense = NO) & Modulating (Boiler Type =
MOD or EMS).
STAGING MODE CONDENSING
Selects either low-high-low-high (LHLH) or low-low-high-high (LLHH) staging for
multiple two-stage condensing boilers.
This item is only available if there are at least two boilers set to auto (Boiler
Enable = AUTO), condensing (Boiler Condense = YES) & two stage (Boiler Type
= 2STG).
STAGING MODE NON-CONDENSING
Selects either low-high-low-high (LHLH) or low-low-high-high (LLHH) staging for
multiple two-stage non-condensing boilers.
This item is only available if there are at least two boilers set to auto (Boiler
Enable = AUTO), non-condensing (Boiler Condense=NO) & two stage (Boiler
Type = 2STG).
OFF or ON
Default: ON
Access: ADV
OFF or ON
Default: ON
Access: ADV
OFF or ON
Default: OFF
Access: ADV
A Watts Water Technologies Company
ROTATION CONDENSING BOILER GROUP
Selects the equal run time rotation feature within the condensing boiler group.
This item is only available if there are at least two boilers set to auto
(Boiler Enable = AUTO) & condensing (Boiler Condense = YES).
ROTATION NON-CONDENSING BOILER GROUP
Selects the equal run time rotation feature within the non-condensing boiler
group.
This item is only available if there are at least two boilers set to auto
(Boiler Enable = AUTO) & non-condensing (Boiler Condense = NO).
FIXED LEAD
Selects whether or not the first boiler is to be excluded from the rotation sequence.
If set to ON, boiler 1 is always the first to fire.
This item is only available if boiler 1 is enabled (Boiler Enable = AUTO) & all
available boilers are either condensing or non-condensing.
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Setup Menu (4 of 6)
Item Field Range Description
OFF or ON
Default: OFF
Access: ADV
FIXED LAST
Selects whether or not the last boiler is to be excluded from the rotation sequence.
If set to ON, boiler 4 is always the last to fire.
This item is only available if boiler 4 is enabled (Boiler Enable = AUTO) & all
available boilers are either condensing or non-condensing.
AUTO, 5 to 30 min
Default: AUTO
Access: ADV
OFF or ON
Default: OFF
Access: ADV
NEAR or Boil
Default: Boil
Access: ADV
OFF or ON
Default: OFF
Access: ADV
70 to 190°F
(21.0 to 88.0°C)
Default: 140°F (60.0°C)
Access: ADV
OFF, 70 to 190°F
(21.0 to 88.0°C)
Default: OFF
Access: ADV
1 to 42°F
(0.5 to 23.5°C)
Default: 6°F (3.0°C)
Access: ADV
100 to 220°F
(38.0 to 104.0°C)
Default: 180°F (82.0°C)
Access: ADV
OFF, 100 to 220°F
(OFF, 38.0 to 104.0°C)
Default: OFF
Access: ADV
HEATING CYCLES
The cycle length to which all tN4 devices will synchronize.
This item is only available when Application Mode is set to RSET & a tN4 device
is present.
INDIRECT DHW MODE
Selects whether indirect DHW heating is active or not.
This item is only available when Application Mode is set to RSET, SETP or
EMS.
INDIRECT DHW LOCATION
Selects the location of the indirect DHW tank.
NEAR = Near boiler piping supplied by boiler 4.
Boil = Boiler system piping supplied by boiler plant.
This item is only available when Application Mode is set to RSET, SETP or EMS
& Indirect DHW Mode is set to ON. NEAR is only available when Plant Flow is
set to PUMP.
INDIRECT DHW SENSOR
Selects if a DHW Sensor is to be used for indirect DHW heating.
This item is only available when Application Mode is set to RSET, SETP or EMS
& Indirect DHW Mode is set to ON.
INDIRECT DHW SETPOINT OCCUPIED
The temperature of the indirect DHW tank during the occupied periods.
This item is only available when Application Mode is set to RSET, SETP or EMS,
Indirect DHW Mode is set to ON & Indirect DHW Sensor is set to ON.
INDIRECT DHW SETPOINT UNOCCUPIED
The temperature of the indirect DHW tank during the unoccupied periods. If
operation is not desired during the unoccupied periods, select OFF.
This item is only available when Application Mode is set to RSET, SETP or EMS,
Indirect DHW Mode is set to ON, Indirect DHW Sensor is set to ON & the Setback
/ Off switch is set to Setback.
INDIRECT DHW DIFFERENTIAL
The temperature differential of the indirect DHW tank from the IDHW SETPOINT
settings.
This item is only available when Application Mode is set to RSET, SETP or EMS,
Indirect DHW Mode is set to ON & Indirect DHW Sensor is set to ON.
INDIRECT DHW EXCHANGE OCCUPIED
The boiler target temperature for the indirect DHW heat exchanger during the
occupied periods.
This item is only available when Application Mode is set to RSET, SETP or EMS,
Indirect DHW Mode is set to ON & Indirect DHW Sensor is set to OFF.
INDIRECT DHW EXCHANGE UNOCCUPIED
The boiler target temperature for the indirect DHW heat exchanger during the
unoccupied periods. If operation is not desired during the unoccupied periods,
select OFF.
This item is only available when Application Mode is set to RSET, SETP or EMS,
Indirect DHW Mode is set to ON, Indirect DHW Sensor is set to OFF & the Setback
/ Off switch is set to Setback.
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Setup Menu (5 of 6)
Item Field Range Description
OFF or ON
Default: OFF
Access: ADV
1 to 4
Default: 2
Access: ADV
OFF or ON
Default: OFF
Access: ADV
OFF or ON
Default: OFF
Access: ADV
OFF or ON
Default: OFF
Access: ADV
INDIRECT DHW PRIORITY
Selects whether indirect DHW priority is active or not.
This item is only available when Application Mode is set to RSET or EMS & Indirect
DHW Mode is set to ON.
INDIRECT DHW BOILER COUNT
Selects the number of boilers to be used when only a DHW Call is present.
This item is only available when Application Mode is set to RSET, SETP or EMS,
Indirect DHW Mode is set to ON & Indirect DHW Location is set to Boil.
PRIMARY PUMP DURING IDHW OPERATION
Selects whether or not the primary pump is required to operate when a DHW
Call is present.
This item is only available when APP MODE is set to RSET, SETP or EMS, Primary
Pump 1 or Primary Pump 2 is set to AUTO, Indirect DHW Mode is set to ON &
Indirect DHW Location is set to Boil.
SETPOINT MODE
Selects whether setpoint operation is active or not.
This item is only available when Application Mode is set to RSET, SETP or
EMS.
SETPOINT PRIORITY
Selects whether setpoint priority is active or not.
This item is only available when Application Mode is set to RSET or EMS &
Setpoint Mode is set to ON.
OFF or ON
Default: OFF
Access: ADV
60 to 220°F
(15.5 to 104.0°C)
Default: 180°F (82.0°C)
Access: ADV
OFF, 60 to 220°F
(15.5 to 104.0°C)
Default: OFF
Access: ADV
70 to 190°F
(21.0 to 88.0°C)
Default: 140°F (60.0°C)
Access: ADV
OFF, 70 to 190°F
(21.0 to 88.0°C)
Default: OFF
Access: ADV
PRIMARY PUMP DURING SETPOINT OPERATION
Selects whether or not the primary pump is required to operate when a Setpoint
Call is present.
This item is only available when Application Mode is set to RSET, SETP or EMS,
Primary Pump 1 or Primary Pump 2 is set to AUTO & Setpoint Mode is set to
ON.
SETPOINT OCCUPIED TEMPERATURE
The boiler target temperature when a Setpoint Call is present during the occupied
periods.
This item is only available when Application Mode is set to RSET, SETP or EMS
& Setpoint Mode is set to ON.
SETPOINT UNOCCUPIED TEMPERATURE
The boiler target temperature when a Setpoint Call is present during the unoccupied
periods. If operation is not desired during the unoccupied periods, select OFF.
This item is only available when Application Mode is set to RSET, SETP or EMS,
Setpoint Mode is set to ON & the Setback / Off switch is set to Setback
DEDICATED DHW OCCUPIED SETPOINT
The temperature of the dedicated DHW tank during the occupied periods.
This item is only available when Application Mode is set to DDHW.
DEDICATED DHW UNOCCUPIED SETPOINT
The temperature of the dedicated DHW tank during the unoccupied periods.
This item is only available when Application Mode is set to DDHW & the Setback
/ Off switch is set to Setback.
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Setup Menu (6 of 6)
Item Field Range Description
2 to 10°F
(1.0 to 5.5°C)
Default: 5°F (3.0°C)
Access: ADV
OFF, AUTO, 0:20 to
4:00 hrs
Default: OFF
Access: ADV
35 to 100°F, OFF
(2.0 to 38.0°C)
Default: 70°F (21.0°C)
Access: ADV
35 to 100°F, OFF
(2.0 to 38.0°C)
Default:
60°F (15.5°C)
Access: ADV
OFF, 3 to 40 min
Default: 20 min
Access: ADV
DEDICATED DHW DIFFERENTIAL
The temperature differential of the dedicated DHW tank from the DDHW SETPOINT
settings.
This item is only available when Application Mode is set to DDHW.
PRIORITY OVERRIDE
The amount of time priority is given for indirect DHW or setpoint operation before
space heating resumes.
This item is only available when Application Mode is set to RSET or EMS, &
Indirect DHW Mode is set to ON & Indirect DHW Priority is set to ON, or Setpoint
Mode is set to ON & Setpoint Priority is set to ON.
WWSD OCCUPIED
The system’s warm weather shutdown temperature during the occupied
periods.
This item is only available when the Application Mode is set to RSET.
WWSD UNOCCUPIED
The system’s warm weather shutdown temperature during the unoccupied
periods.
This item is only available when the Application Mode is set to RSET & the Setback
/ Off switch is set to Setback.
BOILER ALERT
Alert signal if the boiler supply temperature does not increase in temperature, after
all available boilers have been turned on, within the selected time.
OFF or ON
Default: OFF
Access: ADV
0 to 100 gpm
Default: 0 gpm
Access: ADV
100 to 2,000 gpm
Default: 500 gpm
Access: ADV
OFF, 1 to 100%
Default: OFF
Access: ADV
OFF or ON
Default: OFF
Access: ADV
FLOW SENSOR
Selects whether or not a flow sensor is used.
FLOW RATE 4MA
Sets the flow rate that corresponds to 4 mA for the flow sensor.
This item is only available when Flow Sensor is set to ON.
FLOW RATE 20MA
Sets the flow rate that corresponds to 20 mA for the flow sensor.
This item is only available when Flow Sensor is set to ON.
FLOW SENSOR PROOF
Sets the percentage of flow used for proving primary pump flow. If the flow sensor
is only used for monitoring, set to OFF. This is the minimum flow required to prove
primary pump flow.
This item is only available when Flow Sensor is set to ON.
PRESSURE SENSOR
Selects whether or not a pressure sensor is used.
50, 100, 150, 200, 250,
Access: ADV
A Watts Water Technologies Company
300
Default: 50
PRESSURE SENSOR RANGE
Selects the model of pressure sensor based on the pressure range in units of
PSI.
This item is only available when Pressure Sensor is set to ON.
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Source # Menu (1 of 2)
There is a different Source Menu for each of the 4 boilers that the 284 can operate. Settings can vary for each boiler if desired.
OFF or AUTO
Default:
AUTO for Boil1
OFF for Boiler 2-4
Access: INST
BOILER ENABLE
Selects whether the boiler is operational or not.
OFF or Boil1
Default: OFF
Access: INST
NO or YES
Default: NO
Access: ADV
MOD, 1STG, 2STG,
EMS
Default: MOD
Access: ADV
0-10 or 4-20
Default: 0-10
Access: ADV
10 to 180 sec
Default: 30 sec
Access: ADV
OFF, 10 to 180 sec
Default: OFF
Access: ADV
COPY BOILER 1
Selects whether or not settings from boiler 1 are copied to Boiler 2, 3 & 4.
This item is applicable for Boiler 2, 3 and 4 and is only available if Boiler Enable
is set to AUTO.
BOILER CONDENSE
Selects if the boiler is non-condensing (NO) or condensing (YES).
This item is only available if Boiler Enable is set to AUTO & Copy Boiler 1 is set
to OFF.
BOILER TYPE
Selects from the different types of burner operation including modulating direct drive
(MOD), single stage (1STG), two stage (2STG) & target temperature (EMS).
This item is only available if Boiler Enable is set to AUTO & Copy Boiler 1 is set
to OFF.
MODULATION TYPE
Selects either 0-10 Vdc (0-10) or 4-20 mA (4-20) as the analot output for the
modulating boiler.
This item is only available if Boiler Enable is set to AUTO, Copy Boiler 1 is set to
OFF & Boiler Type is set to MOD or EMS.
FIRE DELAY
Delay from turn-on of ignition until the burner obtains flame.
This item is only available if Boiler Enable is set to AUTO & Copy Boiler 1 is set
to OFF.
MODULATION DELAY
Delay between the burner obtaining flame & the boiler’s ignition control releasing
to modulation.
This item is only available if Boiler Enable is set to AUTO, Copy Boiler 1 is set to
OFF & Boiler Type is set to MOD.
LOW, MED, HI
Default: MED
Access: INST
10 to 9990 MBtu/h
Default: 80 MBtu/h
Access: ADV
10 to 9990 MBtu/h
Default: 400 MBtu/h
Access: ADV
A Watts Water Technologies Company
BOILER MASS
The thermal mass characteristics of the boiler.
This item is only available if Boiler Enable is set to AUTO & Copy Boiler 1 is set
to OFF.
BOILER OUTPUT LOW
Minimum (low fire) heat output in Btu/hr/1000.
This item is only available if Boiler Enable is set to AUTO, Copy Boiler 1 is set to
OFF & Boiler Type is set to MOD.
BOILER OUTPUT HIGH
Maximum (high fire) heat output in Btu/hr/1000.
This item is only available if Boiler Enable is set to AUTO & Copy Boiler 1 is set
to OFF.
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Source # Menu (2 of 2)
10 to 230 sec
Default: 30 sec
Access: ADV
0 to 100%
Default: 0%
Access: ADV
0 to 50%
Default: 0%
Access: ADV
50 to 100%
Default: 100%
Access: ADV
0.5 to 10.0
Default: 1.0
Access: ADV
MOTOR SPEED
The amount of time required for the modulating actuating motor to fully open the
gas valve or operate the blower from a stopped position to full speed.
This item is only available if Boiler Enable is set to AUTO, Boiler 1 Copy is set to
OFF & Boiler Type is set to MOD.
START MODULATION
The percentage modulation required for ignition.
This item is only available if Boiler Enable is set to AUTO, Boiler 1 Copy is set to
OFF & Boiler Type is set to MOD.
MINIMUM MODULATION
The minimum percentage modulation of the burner.
This item is only available if Boiler Enable is set to AUTO, Boiler 1 Copy is set to
OFF & Boiler Type is set to MOD.
MAXIMUM MODULATION
The maximum percentage modulation of the burner.
This item is only available if Boiler Enable is set to AUTO, Boiler 1 Copy is set to
OFF & Boiler Type is set to MOD.
EMS SIGNAL MINIMUM
The minimum analog signal used for the EMS (temperature input) boiler and
corresponds to the EMS Temperature Minimum.
This item is only available if Boiler Enable is set to AUTO, Boiler 1 Copy is set to
OFF, Boiler Type is set EMS & Modulation Type is set to 0-10.
50 to 210°F, OFF
(10.0 to 99.0°C)
Default: 50°F
Access: ADV
50 to 210°F, OFF
(10.0 to 99.0°C)
Default: 210°F
Access: ADV
120 to 240°F, OFF
(49.0 to 115.5°C, OFF)
Default: OFF
Access: ADV
OFF, AUTO, 0:10 to
20:00 min
Default: AUTO
Access: ADV
EMS TEMPERATURE MINIMUM
The temperature that corresponds to the bottom rail (minimum) of the analog signal
(4 mA / Vdc Signal Minimum) used for the EMS (temperature input) boiler.
This item is only available if Boiler Enable is set to AUTO, Boiler 1 Copy is set to
OFF & Boiler Type is set to EMS.
EMS TEMPERATURE MAXIMUM
The temperature that corresponds to the top rail (maximum) of the analog signal
(20 mA / 10.0 Vdc) used for the EMS (temperature input) boiler.
This item is only available if Boiler Enable is set to AUTO, Boiler 1 Copy is set to
OFF & Boiler Type is set to EMS.
MAXIMUM OUTLET TEMPERATURE
The maximum boiler outlet temperature used for boiler outlet temperature limiting.
The control will turn off the boiler if the boiler outlet temperature rises to the
maximum outlet temperature. If OFF is selected, the control will only monitor the
boiler outlet temperature.
This item is only available if Boiler Enable is set to AUTO & the Boiler 1 Copy is
set to OFF.
BOILER PUMP/VALVE POST PURGE
The time the boiler pump remains on (or isolation valve remains open) once the boiler
turns off. If Auto is selected the control will automatically determine the time.
This item is only available if Boiler Enable is set to AUTO & the Boiler 1 Copy is
set to OFF.
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BAS Menu (1 of 2)
Configure Modbus® & BACnet® options.
Item Field Range Description
OFF or ON
Default: OFF
Access: ADV
BACn, MODB
Default: BACn
Access: ADV
BAS MONITOR
Selects whether or not BAS monitor mode is to be used. Monitor mode allows for
read / write capability of select menu items.
This item is only available when Application Mode is set to either RSET, SETP,
DDHW or EMS.
BAS TYPE
Selects the communication protocol used with the BAS network. Modbus®
communicates over RS485 & BACnet® is over IP.
1 to 247
Default: 1
Access: ADV
RTU or ASCI
Default: RTU
Access: ADV
2400, 9600, 19K2,
57K6, 115K
Default: 19K2
Access: ADV
NONE, EVEN, ODD
Default: EVEN
Access: ADV
0 to 4, 0 to 99, 0 to 99,
0 to 99
Default: 0, 0, 0, 0
Access: ADV
0x1 to 0xFFFF
Default: 0xBAC0
(47808)
Access: ADV
MODBUS ADDRESS
Sets the unique address within the Modbus® network.
This item is only available when BAS Type is set to MODB.
MODBUS DATA
Selects whether the Modbus® data communication type is RTU or ASCII (ASCI).
This item is only available when BAS Type is set to MODB.
MODBUS BAUD RATE
Selects the communication speed. In order to ensure reliable communications, the
baud rate on the control must be same as the Modbus® network.
This item is only available when BAS Type is set to MODB.
MODBUS PARITY
Selects the parity used for the Modbus® communication.
This item is only available when BAS Type is set to MODB.
BACNET DEVICE ID
Sets the unique address within the
number sets displayed in the source output fields. Touch the ‘Next Item’ button to
view & adjust each number set.
This item is only available when BAS Type is set to BACn.
BACnet® network. The address is set using four
BACNET PORT
Sets the User Datagram Port (UDP) port on the
This item is only available when BAS Type is set to BACn.
BACnet® network.
OFF or ON
Default: ON
Access: ADV
0 to 255, 0 to 255, 0 to
255, 1 to 254
Default: 192,168,0,200
Access: ADV
A Watts Water Technologies Company
BACNET DHCP
Selects whether or not the Dynamic Host Configuration Protocol (DHCP) is used
to automatically assign the IP address on the
the address is displayed in the source output fields.
This item is only available when BAS Type is set to BACn.
BACnet® network. If ON is selected,
BACNET IP ADDRESS
Sets the IP address on the
number sets displayed in the source output fields. Touch the ‘Next Item’ button
to view & adjust each number set. Touch the ‘Next Item’ button to view & adjust
each number set.
This item is only available when BAS Type is set to BACn & BACn DHCP is set
to OFF.
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BACnet® network. The address is set using four
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BAS Menu (2 of 2)
Item Field Range Description
BACNET GATEWAY
0 to 255, 0 to 255, 0 to
255, 1 to 254
Default: 192,168,0,1
Access: ADV
Sets the Gateway address on the
number sets displayed in the source output fields. Touch the ‘Next Item’ button to
view & adjust each number set. Touch the ‘Next Item’ button to view & adjust each
number set.
This item is only available when BAS Type is set to BACn & BACn DHCP is set
to OFF.
BACnet® network. The address is set using four
0 to 255, 0 to 255, 0 to
255, 0 to 255
Default: 255,255,255,0
Access: ADV
OFF, 30 to 65535
Default: OFF
Access: ADV
0 to 255, 0 to 255, 0 to
255, 0 to 255
Default: 127,127,127,127
0x1 to 0xFFFF
Default: 0xBAC0
(47808)
Access: Adv
BACNET SUBNET
Sets the subnet address on the
BACnet® network. The address is set using four
number sets displayed in the source output fields. Touch the ‘Next Item’ button to
view & adjust each number set. Touch the ‘Next Item’ button to view & adjust each
number set.
This item is only available when BAS Type is set to BACn & BACn DHCP is set
to OFF.
BACNET BBMD TIME
Sets the BACnet® Broadcast Management Device (BBMD) time-to-live used for
foreign device registration.
This item is only available when BAS Type is set to BACn & DHCP is set to ON.
BACNET BBMD IP
Sets the BBMD IP address on the BACnet® network. The address is set using four
number sets displayed in the source output fields. Touch the ‘Next Item’ button to
view & adjust each number set. Touch the ‘Next Item’ button to view & adjust each
number set.
This item is only available when BAS Type is set to BACn & BACnet
®
BBMD Time
is not set to OFF.
BACNET BBMD PORT
Sets the BBMD UDP port on the BACnet® network.
This item is only available when BAS Type is set to BACn & BACnet
®
BBMD Time
is not set to OFF.
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Monitor # Menu (1 of 1)
Monitor (#) items are repeated for each available boiler.
Item Field
Range
0 to 65535 hours
Access: ADV
0 to 65535 hours
Access: ADV
0 to 65535
Access: ADV
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
Description
BURNER RUN TIME
The total running time of the boiler since this item was last cleared. Press & hold
the ‘CLEAR’ button while viewing to reset.
This item is only available when Boiler Enable is set to AUTO.
BOILER PUMP / VALVE RUN TIME
The total running time of the boiler pump / valve since this item was cleared. Press
& hold the ‘CLEAR’ button while viewing to reset.
This item is only available when Boiler Enable is set to AUTO.
BOILER CYCLES
The total number of boiler cycles since this item was cleared. Press & hold the
‘CLEAR’ button while viewing to reset.
This item is only available when Boiler Enable is set to AUTO.
BOILER OUTLET HIGH
Records the highest boiler outlet temperature since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when Boiler Enable is set to AUTO & a boiler outlet
sensor is connected.
BOILER OUTLET LOW
Records the lowest boiler outlet temperature since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when Boiler Enable is set to AUTO & a boiler outlet
sensor is connected.
-22 to 266°F
(-12.0 to 148.0°C)
Access: ADV
BOILER TEMPERATURE DIFFERENCE HIGH
Records the highest temperature difference between the boiler inlet & boiler
outlet sensors since this item was cleared.
while viewing to reset.
This item is only available when Boiler Enable is set to AUTO & boiler outlet &
boiler inlet sensors are connected.
Press & hold the ‘CLEAR’ button
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Monitor Menu (1 of 2)
This Monitor Menu displays items that are not specific to one boiler.
Item Field
Range
0 to 65535 Therms
Access: ADV
0 to 65535 hours
Access: ADV
0 to 65535 hours
Access: ADV
0 to 65535 hours
Access: ADV
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
Description
ENERGY
Total calculated energy being delivered to the load since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset. This item is only available
when Flow Sensor is set to ON & a boiler return sensor is connected.
PRIMARY PUMP 1 RUN TIME
The total running time of primary pump 1 since this item was cleared. Press &
hold the ‘CLEAR’ button while viewing to reset.
PRIMARY PUMP 2 RUN TIME
The total running time of primary pump 2 since this item was cleared. Press &
hold the ‘CLEAR’ button while viewing to reset.
DHW PUMP RUN TIME
The total running time of the IDHW pump since this item was cleared. Press &
hold the ‘CLEAR’ button while viewing to reset.
BOILER SUPPLY HIGH
Records the highest boiler supply temperature since this item was last cleared.
Press & hold the ‘Clear’ button while viewing to reset.
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
-22 to 266°F
(-30 to 130°C)
Access: ADV
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
-22 to 266°F
(-12.0 to 148.0°C)
Access: ADV
0 to 65535 gpm
Access: ADV
0 to 65535 psi
Access: ADV
BOILER SUPPLY LOW
Records the lowest boiler supply temperature since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset.
BOILER RETURN HIGH
Records the highest boiler return temperature since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when a boiler return sensor is connected.
BOILER RETURN LOW
Records the lowest boiler return temperature since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when a boiler return sensor is connected.
SUPPLY TEMPERATURE DIFFERENCE HIGH
Records the highest temperature difference between the boiler supply & boiler
return sensors since this item was cleared.
while viewing to reset.
This item is only available when the boiler supply & boiler return sensors are
connected
Press & hold the ‘CLEAR’ button
FLOW RATE HIGH
Records the highest flow rate from the flow sensor since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when Flow Sensor is set to ON.
PRESSURE HIGH
Records the highest pressure since this item was last cleared. Press & hold the
‘CLEAR’ button while viewing to reset.
This item is only available when Pressure Sensor is set to ON.
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Monitor Menu (2 of 2)
Item Field
Range
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
-76 to 149°F
(-60.0 to 65.0°C)
Access: ADV
-76 to 149°F
(-60.0 to 65.0°C)
Access: ADV
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
Description
BOILER INLET HIGH
Records the highest boiler inlet temperature since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when a boiler inlet sensor is connected.
BOILER INLET LOW
Records the lowest boiler inlet temperature since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when a boiler inlet sensor is connected.
OUTDOOR HIGH
Records the highest outdoor temperature since this item was last cleared.
& hold the ‘CLEAR’ button while viewing to reset.
This item is only available when an outdoor sensor is connected.
Press
OUTDOOR LOW
Records the lowest outdoor temperature since this item was last cleared.
& hold the ‘CLEAR’ button while viewing to reset.
This item is only available when an outdoor sensor is connected.
Press
INDIRECT DHW HIGH
Records the highest indirect DHW temperature since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when Application Mode is not set to BAS, Indirect DHW
Mode is set to ON & Indirect DHW Sensor is set to ON.
INDIRECT DHW LOW
Records the lowest indirect DHW temperature since this item was last cleared.
Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when Application Mode is not set to BAS, Indirect DHW
Mode is set to ON & Indirect DHW Sensor is set to ON.
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
-22 to 266°F
(-30.0 to 130.0°C)
Access: ADV
-40 to 500°F
(-40.0 to 260.0°C)
Access: ADV
-40 to 500°F
(-40.0 to 260.0°C)
Access: ADV
DIRECT DHW HIGH
Records the highest direct DHW temperature (boiler supply sensor) since this item
was last cleared. Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when Application Mode is set to DDHW.
DIRECT DHW LOW
Records the lowest direct DHW temperature (boiler supply sensor) since this item
was last cleared. Press & hold the ‘CLEAR’ button while viewing to reset.
This item is only available when Application Mode is set to DDHW.
VENT HIGH
Records the highest vent temperature since this item was last cleared. Press &
hold the ‘CLEAR’ button while viewing to reset.
This item is only available when a vent sensor is connected.
VENT LOW
Records the lowest vent temperature since this item was last cleared. Press &
hold the ‘CLEAR’ button while viewing to reset.
This item is only available when a vent sensor is connected.
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Time Menu (1 of 1)
The Time menu sets the time & date.
The Setback / Off switch setting must be in the Setback position in order to have access to the Time menu.
Set minutes.
Set year.
Set hours, then select AM or
PM. For a 24 hr clock, AM /
PM is not displayed.
Turn daylight sav ings time
ON if an automatic time
change is required.
Set date. Set month.
Select 12 or 24 hr clock.
Select On or Off. If On
is selected, the Time
will be displayed in
the View menu.
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Schedule Menu (1 of 1)
•
•
• •
• •
• •
•
•
•
•
•
The 284 can follow an internal schedule or an available
schedule on a
tekmarNet
®
network. Four heating schedules
can be present on one network. The number of available
schedule times depends on selections made for the Heat
Schedule, Schedule Type & Events / Day settings.
Day 24 Hour 5-2 5-11 7 day
Sa
Su
Mo
Tu
We
Schedule Type
Th
Fr
Default Times
Events / Day Event 24Hr Sat Sun Mon Tue Wed Thu Fri
Occupied 1
UnOccupied 1
6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM
8:00 AM 8:00 AM 8:00 AM 8:00 AM 8:00 AM 8:00 AM 8:00 AM 8:00 AM
4
Occupied 2
UnOccupied 2
6:00 PM 6:00 PM 6:00 PM 6:00 PM 6:00 PM 6:00 PM 6:00 PM 6:00 PM
10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM
or
Occupied
6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM
2
Unoccupied
Item Field
OFF, CTRL, MST1,
MST2, MST3, MST4,
MBR1, MBR2, MBR3,
Access: USER
10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM 10:00 PM
Range
Description
HEAT SCHEDULE
OFF = No schedule.
MBR4
Default = OFF
CTRL = Schedule only used by this control.
MST1 to MST4 = Schedule is shared with other tN4 devices.
MBR1 to MBR4 = Schedule is set on another tN4 device.
This item is only available when the Setback / Off switch is set to Setback.
SCHEDULE TYPE
24hr, 5-2, 5-11, 7DAY
Default = 24hr
Access: USER
2 or 4
Default = 2
Access: USER
24hr = One schedule for all days of the week.
5-2 = One schedule for weekdays & one for weekends.
5-11 = One schedule for weekdays, one for Saturday & one for Sunday.
7DAY = A schedule for each day of the week.
This item is only available when the Setback / Off switch is set to Setback & the
Heat Schedule is set to CTRL or MST1 to MST4.
EVENTS / DAY
2 = 2 Events per day (Occ, Unocc)
4 = 4 events per day (Occ 1, Unocc 1, Occ 2, Unocc 2)
This item is only available when the Setback / Off switch is set to Setback & the
Heat Schedule is set to CTRL or MST1 to MST4.
12:00AM to 11:50PM,
SKIP
or
00:00 to 23:50, SKIP
Default = 6:00AM
OCCUPIED START TIME (ALL DAYS, MON-FRI, SAT-SUN)
Select the time for the Occupied period to start. Additional occupied event times
are available depending on the schedule type & mode settings.
This item is only available when the Setback / Off switch is set to Setback, Heat
Schedule is set to CTRL or MST1 to MST4.
Access: USER
12:00AM to 11:50PM,
SKIP
or
00:00 to 23:50, SKIP
Default = 8:00AM
Access: USER
UNOCCUPIED START TIME (ALL DAYS, MON-FRI, SAT-SUN)
Select the time for the Unoccupied period to start. Additional unoccupied event
times are available depending on the schedule type & mode settings.
This item is only available when the Setback / Off switch is set to Setback, Heat
Schedule is set to CTRL or MST1 to MST4.
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Toolbox Menu (1 of 2)
Item Field
Range
Error Display
Access: ---
USER, INST, ADV
Default: INST
Access: USER
OFF, SEL, DONE
Default: OFF
Access: ADV
284, Software Version
Access: USER
°F or °C
Default: °F
Access: USER
Description
ERROR
If an error is present, it will be displayed as the first item in the toolbox menu.
Additional troubleshooting information scrolls on the display. For more information
about error messages, refer to the Error Messages section of this document.
ACCESS LEVEL
The access level of the control. The access column shows which items are visible
in each access level.
This item is only available if the Lock / Unlock switch is set to Unlock.
DEFAULT
Press the Enter button to show SEL. After 3 seconds DONE will be indicated &
factory defaults will be loaded to all settings.
TYPE & SOFTWARE VERSION
Product number of the control displayed in the number field. Software version
displayed in the item field.
TEMPERATURE UNITS
Units for display of temperature.
gpm or m³/h
Default: gpm
Access: INST
MBtu or kWh
Default: MBtu
Access: INST
psi or kPa
Default: psi
Access: INST
1 to 24
Access: INST
1 to 24
Access: INST
FLOW RATE UNITS
Units for display of flow rate.
This item is only available if Flow Sensor is set to ON.
ENERGY UNITS
Units for display of Energy. If MBtu is selected, the units used for Energy are Therms
(THRM). If kWh is selected, the units used for Energy are Gigajoules (GJ).
This item is only available if Flow Sensor is set to ON.
PRESSURE UNITS
Units for display of pressure.
This item is only available if Pressure Sensor is set to ON.
BOILER BUS B DEVICES
Displays the number of tN4 devices connected to the Boiler Bus b terminals, tN4
& C0 (32 & 33).
BOILER BUS 1 DEVICES
Displays the number of tN4 devices connected to the Boiler Bus 1 terminals, tN4
& C1 (34 & 35).
Access: INST
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BOILER BUS 2 DEVICES
Displays the number of tN4 devices connected to the Boiler Bus 2 terminals, tN4
& C2 (36 & 37).
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Toolbox Menu (2 of 2)
Item Field
Range
1 to 24
Access: INST
The error date & the
type of error
alternate on the
screen
Access: INST
Description
BOILER BUS 3 DEVICES
Displays the number of tN4 devices connected to the Boiler Bus 3 terminals, tN4
& C3 (38 & 39).
ERROR HISTORY 1-5
Displays a history of any past errors that have occurred on the system. Will
automatically clear after 30 days. To manually clear, press ‘CLEAR’ while viewing
the error until CLR is displayed. The last 5 history items will display if present.
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--------------------------------
---------------------------
-------------------------
---------------------------
--------------------------------
Manual Override
Commissioning, testing & troubleshooting features of the 284
are accessed by holding the Manual Override button for 3
seconds. Once an item is selected in this menu, there is a 3
second delay before the feature activates. The Manual Override
has five different modes including:
Automatic (AUTO)
The normal operating mode for the control is automatic. The control
operates based on the settings, calls & current conditions.
Purge Override (PURG)
In this mode, the control overrides the normal operating mode
& operates pumps. This mode is useful for purging air out of
the system.
Primary pump: operation of the primary pump is dependent
•
on the system settings in the Setup menu. Only one enabled
primary pump is turned on. If both primary pumps are
enabled, primary pump 1 is turned on. If primary pump 1 is
disabled & primary pump 2 is enabled, primary pump 2 is
turned on. If both primary pumps are disabled, no primary
pump is turned on.
IDHW pump: operation of the IDHW pump is dependent on
•
the system settings in the Setup menu. If IDHW Mode is
turned on, the IDHW pump is turned on. If IDHW Mode is
turned Off, the IDHW pump is not turned on.
When in Purge mode, ‘PURG’ & ‘OVR’ will scroll in the status
•
field of the display.
Purge will operate for a fixed period of 72 hours. After the
•
purge period expires the control will revert to Automatic
operation. The purge override can also be terminated by
selecting the AUTO override mode.
Max Heat Override (MAX)
In this mode, the control overrides the normal operating mode
& operates the system to maintain a boiler target temperature
of 230°F. This function is useful on start-up & commissioning,
& also when drying sheet rock & paint in the building.
Operation of the equipment is dependent on the system.
•
WWSD, IDHW & Setpoint Priority are disabled during Max
•
Heat.
While in Max Heat mode, ‘MAX’ & ‘HEAT’ will scroll in the
•
status field of the display.
Max Heat will operate for an adjustable timeout period.
•
After the timeout period elapses the control will revert back
to Automatic mode. The max heat override can also be
terminated by selecting the AUTO override mode.
--------------------------------
---------------------------
-------------------------
Hand Override (HAND)
In this mode, the control overrides the normal operating mode
& allows for manual operation of the equipment. This mode is
useful for testing & assisting with troubleshooting.
•
Operation of the equipment is dependent on the settings in
the Setup menu. Refer to the ‘Selecting a Manual Override
Mode’ for the sequence of steps.
While in Hand mode, ‘HAND’ & ‘OVR’ will scroll in the status
•
field of the display.
•
Hand mode will operate for an adjustable timeout period.
After the timeout period elapses the control will revert back to
Automatic mode. The hand override can also be terminated
by selecting the AUTO override mode.
Off Override (OFF)
In this mode, the control overrides the normal operating mode
& forces the entire system off. This mode is useful for conducting maintenance or changeout of mechanical components in
the system.
•
While in Off mode, ‘OFF’ & ‘OVR’ will scroll in the status
field of the display.
•
The Off override can be terminated at any time by selecting
the AUTO override mode.
---------------------------
--------------------------------
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Selecting a Manual Override Mode
Press &
hold for 3
seconds
Item Field
Manual
Override
Range
AUTO, OFF, HAND,
MAX, PURG
1hr to 72hr
OFF or ON
OFF or ON
OFF, PMP1 or PMP2
Once an item is selected in this menu, there is a 3 second delay before
the feature activates.
Description
MANUAL OVERRIDE
Select which mode of manual override to activate.
TIMEOUT
Set the timeout used for the Hand & Maximum Heat manual overrides.
This item is only available if Manual Override is set to either HAND or MAX.
ALERT
Selects manual operation of the Alert relay.
This item is only available if Manual Override is set to HAND.
AUXILIARY
Selects manual operation of the Auxiliary relay. The Auxiliary is defined to be
either a C.A. damper or a DHW recirculation pump.
This item is only available if Manual Override is set to HAND.
PRIMARY PUMP
Selects manual operation of the primary pump. Only one pump can operate. If a
pump is operating & then the other pump is selected, the former pump will turn
off while the latter pump remains on.
This item is only available if Manual Override is set to HAND.
OFF or ON
OFF or ON
1STG: OFF or 1
:
OFF, 1 or 2
2STG
0 to 100%
OFF, EMS TEMP MIN
to EMS TEMP MAX
DHW PUMP
Selects manual operation of the DHW pump.
This item is only available if Manual Override is set to HAND & IDHW Mode is
set to ON.
BOILER (#) PUMP / VALVE
Selects operation of the boiler pump. This item is available for each of the available
boilers.
This item is only available if Manual Override is set to HAND,
BOILER (#) STG
Selects operation of single & two stage boilers. This item is available for each of
the available single & two stage boilers. If the boiler pump / valve is not already
activated, it will turn on.
OFF: boiler off (applicable for single & two stage)
•
1: Turn on stage 1 (applicable for single & two stage)
•
2: Turn on stage 2 (applicable for two stage)
•
This item is only available if Manual Override is set to HAND & Boiler Enable is
set to AUTO & Boiler Type is set to 1STG or 2STG.
BOILER (#) MOD
Sets percentage modulation for modulating boilers. This item is available for
each of the available modulating boilers. If the boiler pump / valve is not already
activated, it will turn on.
This item is only available if Manual Override is set to HAND & Boiler Enable is
set to AUTO & Boiler Type is set to MOD.
BOILER (#) TEMP
Sets the target temperature for temperature input boilers. This item is available
for each of the available temperature input boilers. If the boiler pump / valve is not
already activated, it will turn on.
This item is only available if Manual Override is set to HAND & Boiler Enable is
set to AUTO & Boiler Type is set to EMS.
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Troubleshooting
It is recommended to complete all wiring to ensure trouble free operation. Should an error occur, simply follow these steps:
1. Find: If the Boiler Control 284 flashes
2. Identify: Press & hold the Home button for 3 seconds to view the available menus. Tap the NEXT ITEM button to locate the
Toolbox Menu & press ENTER to view the toolbox menu items. The Error code should appear as the first item. The troubleshooting
tips will then marquee across the Item field.
3. Solve: Using the lookup chart below, match the Error code to the one on the control. Use the Description & Troubleshooting
Tips in the chart to solve the problem.
Error Messages (1 of 3)
Error Message Description Troubleshooting Tips
CONTROL SETUP FAILURE
The control failed to read the Setup menu settings, & reloaded
factory default settings. Operation stops until this error message
is cleared.
To clear, press the ‘CLEAR’ button while viewing this
warning message.
BOILER SUPPLY SENSOR ERROR
OPEN or SHRT displays on the screen.
Due to an open or short circuit, the control failed to read the
boiler supply sensor. As a result, & if available, the control
operates using the boiler return sensor. If the boiler return sensor
is unavailable, operation stops. The error message self clears
once the error condition is corrected.
BOILER RETURN SENSOR ERROR
OPEN or SHRT displays on the screen.
Due to an open or short circuit, the control failed to read the boiler
return sensor. If the Boiler Supply sensor is available, the control
will operate normally. If the Boiler Supply sensor is unavailable,
the control can only operate to satisfy indirect DHW if its located
in the near boiler piping (i.e. IDHW Location = Near). The error
message self clears once the error condition is corrected.
DHW SENSOR ERROR
OPEN or SHRT displays on the screen.
Due to an open or short circuit, the control failed to read the
DHW sensor. As a result, the control stops operation for DHW
heating (indirect or direct DHW). The error message self clears
once the error condition is corrected.
OUTDOOR SENSOR ERROR
OPEN or SHRT displays on the screen.
Due to an open or short circuit, the control failed to read the
outdoor sensor. As a result, the control assumes an outdoor
temperature of 32°F (0.0°C) & continues operation. The error
message self clears once the error condition is corrected.
VENT SENSOR ERROR
OPEN or SHRT displays on the screen.
Due to an open or short circuit, the control failed to read the vent
sensor. If the Vent Maximum is set to a temperature, the control
stops operation. If the Vent Maximum is set to Off, the control
continues operation. The error message self clears once the
error condition is cleared.
BOILER (#) OUTLET SENSOR ERROR
OPEN or SHRT displays on the screen.
Due to an open or short circuit, the control failed to read the
boiler (#) outlet sensor. The error message self clears once the
error condition is cleared.
on the screen, it is indicating a problem on the system.
RESET DEFAULTS,
VERIFY ALL SETTINGS
CHECK BOILER SUPPLY SENSOR,
CHECK BOILER SUPPLY SENSOR
WIRING
CHECK BOILER RETURN SENSOR,
CHECK BOILER RETURN SENSOR
WIRING
CHECK DHW SENSOR,
CHECK DHW SENSOR WIRING
CHECK OUTDOOR SENSOR,
CHECK OUTDOOR SENSOR
WIRING
CHECK VENT SENSOR
CHECK VENT SENSOR WIRING
CHECK BOILER (#) OUTLET
SENSOR,
CHECK BOILER (#) OUTLET
SENSOR WIRING
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Error Messages (2 of 3)
Error Message Description Troubleshooting Tips
BOILER (#) OUTLET SENSOR MAXIMUM EXCEEDED
The boiler outlet (#) temperature exceeded the Maximum Outlet
temperature. As a result, the control stops operation for the
associated boiler. The error message self clears once the error
condition is cleared.
BOILER INLET SENSOR ERROR
OPEN or SHRT displays on the screen.
Due to an open or short circuit, the control failed to read the
boiler inlet sensor. The control operates normally while the error
message is present. The error message self clears once the
error condition is corrected.
BOILER (#) OUTLET TEMP
EXCEEDS MAX OUT SETTING
CHECK BOILER INLET SENSOR,
CHECK BOILER INLET SENSOR
WIRING
PRIMARY PUMP P1 FLOW PROOF FAILURE
The primary pump P1 has failed. Once the primary pump 1 relay
closed, a flow proof call was call not detected before the flow
proof delay time elapsed.
PRIMARY PUMP P2 FLOW PROOF FAILURE
The primary pump P2 has failed. Once the primary pump 2 relay
closed, a flow proof call was call not detected before the flow
proof delay time elapsed.
PRIMARY PUMP P1 & P2 FLOW PROOF FAILURE
Both the primary pump P1 & P2 have failed.
FLOW PROOF CALL ERROR
The primary pump has been turned off but the flow proof call
remains detected after 4 minutes.
COMBUSTION AIR PROOF FAILURE
The combustion air damper has failed. The C.A. (Aux) relay
closed, but the control did not detect a C.A. proof call before the
C.A. proof delay time elapsed.
CHECK FLOW PROVING DEVICE,
CHECK FLOW PROVING DEVICE
WIRING
CHECK FLOW PROVING DEVICE,
CHECK FLOW PROVING DEVICE
WIRING
CHECK FLOW PROVING DEVICE,
CHECK FLOW PROVING DEVICE
WIRING
CHECK FLOW PROVING DEVICE,
CHECK FLOW PROVING DEVICE
WIRING
CHECK CA PROVING DEVICE,
CHECK CA PROVING DEVICE
WIRING
COMBUSTION AIR PROOF CALL ERROR
The combustion air damper has been turned off but the C.A.
proof call remains detected after 4 minutes.
VENT MAXIMUM EXCEEDED
The Vent Sensor temperature has exceeding the VENT MAX
setting. As a result, the control stops operation for the entire
plant.
NO HEAT ALERT
The boiler supply temperature did not increase within the boiler
alert time. The control operates normally while this Alert is
present. To reset the Alert, press the ‘CLEAR’ button while
viewing this warning message.
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CHECK CA PROVING DEVICE,
CHECK CA PROVING DEVICE
WIRING
VENT TEMP EXCEEDS MAX
SETTING
NO CHANGE IN SUPPLY TEMP
WITHIN SPECIFIED PERIOD OF
TIME
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Error Messages (3 of 3)
Error Message Description Troubleshooting Tips
tekmarNet® DEVICE LOST
Communication is lost to a tN4 device on one of the four Boiler
Buses (b, 1, 2, 3). The number shown is the address of the lost
device. The display on the lost device displays Bus Boil Opn.
Ensure that there is power to the lost device. Trace the wires
from the control to the lost device looking for loose or damaged
wires. The error message self clears when the error condition
is corrected.
If the tN4 device is deliberately removed, press the ‘CLEAR’
button while viewing this error message/
tekmarNet® DUPLICATE MASTER ERROR
More than one tN4 system control has been detected on the tN4
Boiler Bus. The 284 is a “Master Device” & no other tekmarNet
reset controls can be added to the tN4 Boiler Bus terminals. If
one has been added it must be removed from the system.
tekmarNet® DEVICE ERROR #:##
#:## is the address of the device with the error. The bus number
displays before the colon, & the device number display after. Go
to the device with the address displayed.
Possible addresses:
b:01
to
b:24
- Device Error on Boiler Bus b
1:01
to
1:24
- Device Error on Boiler Bus 1
2:01
to
2:24
- Device Error on Boiler Bus 2
3:01
to
3:24
- Device Error on Boiler Bus 3
DEVICE MISSING ON TN4 BUS (#)
DUPLICATE MASTER CONTROL
DETECTED ON TN4 BUS
DEVICE ERROR ON TN4 BUS (#)
tekmarNet® DUPLICATE SCHEDULE MASTER ERROR
More than one tN4 device has been assigned the same master
number. The control operates using the Occupied settings while
this error is present.
To clear this error, select a different Schedule Master number,
set a different Schedule Member number, set the Schedule to
Control, or set the Schedule to None.
tekmarNet® SCHEDULE MEMBER ERROR
The control can no longer detect its schedule master. The
control operates using the Occupied settings while this error
is present.
To clear this error, select a different Schedule Member number,
set the Schedule to Control, or set the Schedule to None.
DUPLICATE MASTER SCHEDULE
DETECTED ON TN4 BUS
CHECK SCHEDULE MASTER WIRING
ON TN4 BUS
CHECK SCHEDULE MASTER
ADDRESS ON TN4 BUS
WARNING: This product contains chemicals known to the State of California to
cause cancer and birth defects or other reproductive harm. For more information:
www.watts.com/prop65
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Notes
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Technical Data
Boiler Control 284 Four tN4, BAS, Four Boiler, DHW & Setpoint
Literature 284_A, 284_B, 284_C, 284_D
Control Microprocessor control. This is not a safety (limit) control
Packaged weight 5.5 lb. (2490 g)
Dimensions 8-1/16” H x 11-1/8” W x 2-15/16” D (204 x 282 x 74 mm)
Enclosure Blue PC+ABS plastic with metal top & bottom conduit connection walls, NEMA type 1
Approvals
Ambient conditions
Power supply 115 V (ac) ±10%, 60 Hz, 18 VA
Primary Pump relays 230 V (ac) 10 A, 1/2 hp
Boiler Pump / Valve & IDHW Pump
relays
Boiler Stage, Auxiliary & Alert relays 230 V (ac) 5 A, 1/6 hp
Modulating outputs 4 x 0-10 V (dc) 500 minimum load impedance / 4-20 mA 1 k max load impedance
Calls 24 V (ac) or Short
Sensors NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892
–Included Outdoor Sensor 070 & 2 of Universal Sensor 082
–Optional tekmar type: 071, 078, 082
Warranty Limited 3 Year
CSA C US, meets class B: ICES & FCC Part 15, BTL Listed
Indoor use only, 32 to 122°F (0 to 50°C), < 90% RH non-condensing
230 V (ac) 5 A, 1/3 hp
Limited Warranty & Product Return Procedure
Limited Warranty The liability of tekmar under this warranty is lim-
ited. The Purchaser, by taking receipt of any tekmar product (“Product”), acknowledges the terms of the Limited Warranty in effect at
the time of such Product sale & acknowledges that it has read &
understands same.
The tekmar Limited Warranty to the Purchaser on the Products sold
hereunder is a manufacturer’s pass-through warranty which the
Purchaser is authorized to pass through to its customers. Under
the Limited Warranty, each tekmar Product is warranted against
defects in workmanship & materials if the Product is installed &
used in compliance with tekmar’s instructions, ordinary wear &
tear excepted. The pass-through warranty period is for a period
of twenty-four (24) months from the production date if the Product
is not installed during that period, or twelve (12) months from the
documented date of installation if installed within twenty-four (24)
months from the production date.
The liability of tekmar under the Limited Warranty shall be limited to, at
tekmar’s sole discretion: the cost of parts & labor provided by tekmar to
repair defects in materials &/or workmanship of the defective product;
or to the exchange of the defective product for a warranty replacement
pr oduct ; or to t he grant ing of cr edit lim ite d to the ori gina l co st o f th e de fec tive product, & such repair, exchange or credit shall be the sole remedy
available from tekmar, &, without limiting the foregoing in any way, tekmar
is not responsible, in contract, tort or strict product liability, for any other
losses, costs, expenses, inconveniences, or damages, whether direct,
indirect, special, secondary, incidental or consequential, arising from
ownership or use of the product, or from defects in workmanship or materials, including any liability for fundamental breach of contract.
The pass-through Limited Warranty applies only to those defective Products returned to tekmar during the warranty period. This Limited Warranty does not cover the cost of the parts or labor to remove or transport
the defective Product, or to reinstall the repaired or replacement Product,
all such costs & expenses being subject to Purchaser’s agreement &
warranty with its customers.
Any representations or warranties about the Products made by Purchaser
to its customers which are different from or in excess of the tekmar Limited Warranty are the Purchaser’s sole responsibility & obligation. Purchaser shall indemnify & hold tekmar harmless from & against any & all
claims, liabilities & damages of any kind or nature which arise out of or
are related to any such representations or warranties by Purchaser to its
customers.
The pass-through Limited Warranty does not apply if the returned Product has been damaged by negligence by persons other than tekmar,
accident, fire, Act of God, abuse or misuse; or has been damaged by
modifications, alterations or attachments made subsequent to purchase
which have not been authorized by tekmar; or if the Product was not
installed in compliance with tekmar’s instructions &/or the local codes
& ordinances; or if due to defective installation of the Product; or if the
Product was not used in compliance with tekmar’s instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS
OR IMPLIED, WHICH THE GOVERNING LAW ALLOWS PARTIES TO
CONTRACTUALLY EXCLUDE, INCLUDING, WITHOUT LIMITATION,
IMPLIED WARRANTIES OF MERCHANTABILITY & FITNESS FOR A
PARTICULAR PURPOSE, DURABILITY OR DESCRIPTION OF THE
PRODUCT, ITS NON-INFRINGEMENT OF ANY RELEVANT PATENTS
OR TRADEMARKS, & ITS COMPLIANCE WITH OR NON-VIOLATION
OF ANY APPLICABLE ENVIRONMENTAL, HEALTH OR SAFETY LEGISLATION; THE TERM OF ANY OTHER WARRANTY NOT HEREBY
CONTRACTUALLY EXCLUDED IS LIMITED SUCH THAT IT SHALL NOT
EX TEND BEYOND TWE NTY-FO UR (24) MONT HS F ROM THE PRODUC TION DATE, TO THE EXTENT THAT SUCH LIMITATION IS ALLOWED BY
THE GOVERNING LAW.
Product Warranty Return Procedure All Products that are believed to
have defects in workmanship or materials must be returned, together
with a written description of the defect, to the tekmar Representative
assigned to the territory in which such Product is located. If tekmar
receives an inquiry from someone other than a tekmar Representative,
including an inquiry from Purchaser (if not a tekmar Representative) or
Purchaser’s customers, regarding a potential warranty claim, tekmar’s
sole obligation shall be to provide the address & other contact information regarding the appropriate Representative.
tekmar Control Systems Ltd., A Watts Water Technologies Company.
Vernon, B.C. Canada V1B 3K4, 250-545-7749, Fax. 250-545-0650 Web Site: www.tekmarControls.com
Product design, software & literature are Copyright ©2014 by tekmar
Control Systems Ltd.,
A Watts Water Technologies Company
60 of 60
Head Offi ce: 5100 Silver Star Road,
All specifications are subject to change without notice.
Printed in Canada. 284_D - 08/14.
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