tekmar 363 Installation

- Data Brochure

D 363

Universal Reset Control 363

12/08

The Universal Reset Control 363 is a microprocessor based control designed to maximize the comfort and efﬁciency provided by a hydronic heating system. The control automatically adjusts the boiler and mixed loop water temperatures that are delivered to the heating system by using outdoor reset. For a mixing device, the 363 can use a variable speed driven wet-rotor circulator or a ﬂoating action driven mixing valve. The 363 is capable of controlling an indirect Domestic Hot Water (DHW) storage tank and / or a setpoint load. The temperature of individual zones can be controlled by connecting a conventional thermostat system or a tekmar Zone Control to the 363.

The 363 control includes a large Liquid Crystal Display (LCD) in order to view system status and operating information. The LCD and user key pad are used to set the control’s adjustment and to monitor pump and boiler running hours, DHW tank temperatures, outdoor and system high and low temperatures, boiler ﬁring cycles, plus many other useful items.

Several energy saving features have been incorporated into the 363 such as Warm Weather Shut Down (WWSD), DHW post purge, system setback, DHW priority, Morning Boost, Soft Start and an automatic differential for boiler control. The 363 also has a unique feature that allows the control to supply heat to the mixed system from either the boiler or a thermal storage tank.

Reset Ratio

Characterized Heating Curve

±10% 60 Hz 1800 VA

Do not apply power

22 23

Com19tN1/

10K

tN2

Com24Mix25Boil

Vie

% %

ItemMenu

Input (MIX)

Room

Temperature

Unit (RTU)

Test

WWS

off

not testing

red

testing

red

testing paused

For maximum heat, press and hold

Test

button for 3 seconds.

Meets Class B: Canadian ICES FCC Part 15

Out

Vie

% %

ItemMenu

Input

Remote

Display

Module (RDM)

WWS

Date Code

H1153E

Input

Universal Sensor

Input

Universal Sensor

LR 58233

Input

Outdoor

Included

Sensor

Included

Input

tekmar Timer

Input (MIX)

tekmar Slab Sensor

Input (MIX)

tekmar Indoor Sensor

Input (BOIL

E150539

or MIX)

tekmar Zone Control

Note:

Boiler, DH W, setpoint, or mix demand must be powered wi th 20 to 260 V (ac) bef ore the control will opera te pump/valve outputs or the boiler is able to ﬁr e.

Input

Mix Demand

signal

Input

Boiler

Demand

signal

Input

Setpoint or

DHW

Demand

signal

Input

120 V (ac)

Power

Supply

Output

Boiler System

Pump

Output

DHW Pump OR

DHW Valve

View

Open

Item

Universal Reset Control 363

Mixing, Boiler & DHW

2 31

Com

Mix

Dem

Demand

Output

Mixed System

Pump

Boil

Dem

Setp/ DHW

Output

Boiler

Power N L

8 11

Boil

Mix Demand

Mix P2

Boiler Demand DHW Demand Setpoint Demand WWSD

Minimum Maximum

Pwr

Boiler Opn Cls/

Mix

Var

C US

UnOc

DHW

10 12 14 16

9 17

DHW

Pmp / Vlv

Output

Var. Speed

Driven Pump

Output

Mixing Valve &

Actuating Motor

Universal

(optional)

Setback

None

See product literature INSTALLATION CATEGORY II

Made in Canada by tekmar Control Systems Ltd. tektra 929-05

Power 115 V Relays 230 V (ac) 7.5 A 1/3 hp, pilot duty 240 VA Var. Pump 230 V (ac) 2.4 A 1/6 hp, fuse T2.5 A 250V Demands 20 to 260 V (ac) 2 VA

Signal wiring must be rated at least 300 V. Supply wiring must be rated 90°C minimum

10K

Com UnO

Input

Sensor

1 of 40

How To Use The Data Brochure

This brochure is organized into four main sections. They are: 1) Sequence

Troubleshooting

User Interface

of Operation

installation. The

Control Settings

by the control. The control functions of each adjustable item are described in the

. The

Sequence of Operation

, as this contains important information on the overall operation of the control. Then read the sub sections that apply to your

section (starting at DIP Switch Settings) of this brochure describes the various items that are adjusted and displayed

section has five sub sections. We recommend reading

User Interface .......................................... pg 2

Description of Display Elements ............ pg 3

Sequence of Operation ............................pg 4

Section A: General

Section B: Boiler Reset

Section C: DHW / Setpoint

Section D: Mixing Reset

Section E: Storage

Installation ............................................... pg 16

Electrical Connections.................. pg 17

Testing The Wiring........................ pg 19

DIP Switch Settings ..................................pg 22

........................ pg 4

................. pg 6

.......... pg 9

............... pg 12

........................ pg 15

of Operation

Access Levels ................................................ pg 22

Control Settings ............................................. pg 23

View Menu

Adjust Menu

Schedule Menu

Miscellaneous Menu

RTU Menu

Testing and Troubleshooting ...................... pg 31

Monitor Menu

Error Messages

Technical Data ............................................... pg 40

Limited Warranty ........................................... pg 40

, 2)

Installation

Sequence of Operation

........................................... pg 23

........................................ pg 24

................................... pg 28

........................................... pg 29

...................................... pg 33

.................................. pg 35

, 3)

Control Settings

Section A: General

.......................... pg 29

of the

Sequence

, and 4)

Reference Material: Essay E 003: Characterized Heating Curve and Reset Ratio

E 021: Mixing Methods and Sizing of Variable Speed Injection Pumps

User Interface

The 363 uses a Liquid Crystal Display (LCD) as the method of supplying information. You use the LCD in order to setup and monitor the operation of your system. The 363 has four push buttons (Menu, Item, , ) for selecting and adjusting settings. As you program your control, record your settings in the Adjust Menu table which is found in the second half of this brochure.



All of the items displayed by the control are organized into various menus. These menus are listed on the left hand side of the display (Menu Field). To select a menu, use the button. By pressing and releasing the available menu. Once a menu is selected, there will be a group of items that can be viewed within that menu.

Item



The abbreviated name of the selected item will be displayed in the item field of the display. To view the next available item, press and release the the last available item in a menu, pressing and releasing the display to the first item in the selected menu.

Adjust



To make an adjustment to a setting in the control, begin by selecting the appropriate menu using the

and / or button to make the adjustment.

button. Then select the desired item using the

button, the display will advance to the next

Item

button. Once you have reached

Item

button will return the

Item

button. Finally, use the

Item

Additional information can be gained by observing the Status and Pointers fields of the LCD. The status field will indicate which of the control’s outputs are currently active. Most symbols in the status field are only visible when the View Menu is selected.

2 of 40

Display

Item Field

Displays an abbreviated name of the selected item

Menu Field

Displays the current menu

Status Field

Displays the current status of the control’s inputs, outputs and operation

View Adjust

Monitor

Schd

Misc

Open Close

Item

Aux

UnOcc

DHW

°F °

Number Field

Displays the current value of the selected item

Mix Demand Boiler Demand

min

sec

Ovr

DHW Demand Setpoint Demand WWSD

Minimum

Maximum

Buttons

Selects Menus, Items and

{

adjusts settings

Symbol Description

Open Close

DHW

Aux

Open / Close

Displays when the actuator is opening or closing the mixing valve.

Mixing Device Output Scale

Shows output of injection pump or mixing valve. Arrows show whether the output is increasing or decreasing.

Burner

Displays when the boiler relay is turned on.

Pump

Displays when the boiler pump 1 and / or mixing pump 2 is operating.

DHW Pump / Valve

Displays when the DHW pump or valve is on.

Storage Operation

Displays when the variable speed driven injection pump is drawing heat from the storage tank.

Boost

Displays when the control is in boost after setback.

UnOcc

Occ

Ovr

F, °C, sec,

min, hr

UnOccupied Schedule

Displays when the control is in unoccupied mode.

Occupied Schedule

Displays when the control is in occupied mode.

Override

Displays when the control is in override mode.

Warning

Displays when an error exists or when a limit has been reached.

Lock - Unlock

Displays whether the access levels are locked or unlocked.

°F, °C, sec, min, hr

Units of measurement.

Pointer

Displays the control operation as indicated by the text.

3 of 40

Sequence of Operation

Characterized Heating Curve

Outdoor DSGN

Increasing Water Temperature

MIX or BOIL DSGN

Decreasing Air Temperature

MIX

BOIL INDR

Section A

General Operation

Section B

Boiler Reset

Section C

Domestic Hot

Section D

Mixing Reset

Section E

Storage

Water/Setpoint

Page 4 - 6

Page 6 - 8

Page 9 - 11

Page 12 - 15

Page 15 -16

Section A —General Operation

POWERING UP THE CONTROL

When the Universal Reset Control 363 is powered up, the control displays the control type number in the LCD for 2 seconds. Next, the software version is displayed for 2 seconds. Finally, the control enters into the normal operating mode and the LCD defaults to displaying the current outdoor air temperature.

CHARACTERIZED HEATING CURVE OR RESET RATIO

The 363 has two methods of varying the supply water temperature based on the outdoor air temperature. The installer can select either a

Characterized Heating Curve

The

Characterized Heating Curve

based on outdoor air temperature and optionally indoor temperature is the most accurate. The control takes into account the type of terminal unit that the system is using. Since different types of terminal units transfer heat to a space using different proportions of radiation, convection and conduction, the supply water temperature must be controlled differently. Once the control is told what type of terminal unit is used, the control varies the supply water temperature according to the type of terminal unit. This improves the control of the air temperature in the building.

Characterized Heating Curve

or a

Reset Ratio

method of controlling the supply water temperature

MIX or BOIL DSGN

Reset Ratio

The outdoor air temperature. This method does not take into account the type of terminal unit that the heating system is using and therefore is not as accurate as a

Curve

Reset Ratio

method of controlling the supply water temperature is based solely on the

TERMINAL UNITS (Boil TERM / MIX TERM)

When using a unit. The terminal unit determines the shape of the to how the terminal unit delivers heat into the building space. The 363 provides for selection between six different terminal unit types: two types of hydronic radiant floor heat, fancoil, fin– tube convector, radiator, and baseboard.

Hydronic Radiant Floor

HRF1 is 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 and is slow acting.

Hydronic Radiant Floor

HRF2 is a light, or low mass, hydronic radiant floor system. Most commonly, this type of radiant heating system is either attached to the bottom of a wood sub floor, suspended in the joist space, or sandwiched between the subfloor and the surface. This type of radiant system has a relatively low thermal mass and responds faster than a high mass system.

Fancoil

A fancoil terminal unit or air handling unit (AHU) consists of an hydronic heating coil and either a fan or blower. Air is forced across the coil at a constant velocity by the fan or blower and is then delivered into the building space.

Characterized Heating Curve

(HRF 1)

(HRF 2)

(COIL)

Characterized Heating

, the control requires the selection of a terminal

Characterized Heating Curve

according

MIX

BOIL STRT

Outdoor DSGN

OUT STRT

Decreasing Air Temperature

Reset Ratio

HRF 1

HRF 2

Increasing Water Temperature

COIL

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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 and the room air temperature.

Radiator

(RAD)

CONV

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 and natural convection.

Baseboard

(BASE)

A baseboard terminal unit is similar to a radiator, but has a low profile and is installed at the

RAD

base of the wall. The proportion of heat transferred by radiation from a baseboard is greater than that from a fin-tube convector.

BASE

SETBACK (UnOccupied)

To provide greater energy savings, the 363 has a setback capability. With setback, the supply water temperatures in the system are reduced when the building is not used (AWAY) or when the building is UnOccupied. By reducing water temperatures, air temperature in the space can be reduced even when thermostat(s) are not turned down. This feature is enabled by setting the

Setback / None DIP

switch to the

Setback

position, and providing either

an external signal or an internal override. Note: AWAY does not require the DIP switch =

UnO

Com

Setback.

External UnOccupied

An external signal can place the 363 into an UnOccupied mode. Any time the and the mode. When in the UnOccupied mode, the 363 adjusts the supply water temperature(s) based on the

Com

(23) terminals are shorted together, the control operates in the UnOccupied

UnOcc

segment is displayed in the LCD. The

UnOcc

settings made in the

UnO Sw

(22)

Timer Switch

control.

Internal Overrides

The 363 has a number of setback overrides that are selected through the setback overrides have priority over any external setback signal. Any time an override is in effect, the

Ovr

segment displays in the LCD.

Schd

Menu. These

Schd

UnOcc

Ovr

Temporary (TMPY)

If a temporary override is selected, the 363 operates in the selected override mode for 3 hours. Once completed, the control reverts to the previous operation.

Permanent (PERM)

If a permanent override is selected, the 363 operates in the selected override mode until a new override is selected.

Away (AWAY)

If the AWAY override is selected, the 363 operates with a fixed WWSD of 62˚F (17˚C) and a fixed room temperature of 62˚F (17˚C). Any DHW demand is ignored. The setpoint operation is not affected by the AWAY override.

BOOSTING (Boil BST / MIX BST)

When the control changes from the enters into a the system are raised above their normal values for a period of time to provide a faster recovery from the building’s setback temperature. The maximum length of the boost is selected in the user interface. This setting is only available if a not available for a Control is used.

Typical settings for the BOOST function vary between 30 minutes and two hours for a building that has a fast responding heating system. For a building that has a slow responding heating system, a setting between four hours and 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 temperature at the correct time, the BOOST setting should be lengthened and the setback timer should be adjusted accordingly. If the building is up to temperature before the required time, the BOOST setting should be shortened and the setback timer should be adjusted accordingly. If the system is operating near its design conditions or if the supply water temperatures are being limited by settings made in the control, the time required to bring the building up to temperature may be longer than expected.

Boosting

Reset Ratio

mode. In this mode, the supply water temperatures to

Characterized Heating Curve

Occupied

UnOccupied

, and not needed or available if a tekmar Zone

time. This time in advance is normally the same as the BOOST setting. If the building is not up to

to the

Occupied

mode, it

is selected; It is

5 of 40

Water Temperature

UnOcc to Occ

Boost

Boil TRG

(Occupied)

Boil TRG

(UnOccupied)

Boost setting - 20 minutes to 8 hours

Time

Self Adjusting

Water Temperature

SOFT START (SOF STRT)

The SOF STRT function allows the 363 to slowly ramp the water temperature up to the required supply temperature. By allowing the temperature in the system to be adjusted slowly, the control reduces any thermal expansion noises and stresses that may be caused by a quick change in supply water temperature.

WARM WEATHER SHUT DOWN (WWSD)

When the outdoor air temperature rises above the WWSD setting, the 363 turns on the Weather Shut Down, the displayed if there is a demand. However, the control does not operate the heating system to satisfy these demands. The control does respond to either a in Section C.

EXERCISING (EXERCISE)

The 363 has a built-in pump and valve exercising function. The exercising period is adjustable and comes factory set at 70 hours. If a pump or valve output on the control has not been operated at least once during every exercising period, the control turns on the output for 10 seconds. This minimizes the possibility of a pump or valve seizing during a long period of inactivity. In the case where a mixing valve is being used as the mixing device, the 363 ensures that the valve operates over its entire range at least once each exercising period.

Note: The exercising function does not work if power to the control, valves or pumps is disconnected.

WWSD

pointer in the display. When the control is in Warm

DHW Demand

Mixing Demand

or a

Setpoint Demand

and

Boiler Demand

and operates as described

pointers are

Section B —Boiler Reset (Mode = —1—)

Section B1

General Boiler

Operation

Section B2

Alternate Boiler

Demands

Section B1 —General Boiler Operation

BOILER DEMAND

A boiler demand is generated by applying a voltage between 24 and 240 V (ac) across the is applied, the is not in WWSD, it closes the Boiler Pump contact which starts the boiler pump. The control turns on the Boil P1 segment in the LCD. The 363 calculates a Boil TRG supply temperature based on the outdoor air temperature and settings. The 363 then fires the boiler, if required, to achieve and / or maintain the target supply temperature.

BOILER START (Boil STRT)

The Boil STRT temperature is the boiler supply water temperature that the heating system requires when the outdoor air temperature equals the

OUT STRT air temperature setting.

OUTDOOR START (OUT STRT)

The OUT STRT temperature is the outdoor air temperature at which the control provides the Boil STRT supply water temperature to the system.

OUTDOOR DESIGN (OUT DSGN) (

RESET RATIO

The OUT DSGN is the outdoor air temperature that is the typical coldest temperature of the year where the building is located. This temperature is used when doing heat loss calculations for the building.

Boil Dem

Boiler Demand

(4) and

Com Dem

pointer is displayed in the LCD. If the 363

(

RESET RATIO

(

RESET RATIO

CHARACTERIZED HEATING CURVE

(3) terminals. Once voltage

)

Boiler Reset

Ratio

Boil MIN

Boil STRT

OUT STRT

(27)

OUT DSGN

WWSD Occ

WWSD Unocc

(16)

40 (5)

Outdoor Air Temperature

Boil DSGN

Boil SETB

(-7)

Boil MAX

(-18)

-20

(-29)

210 (99)

190 (88)

170 (77)

150 (66)

130 (54)

110

(43)

(32)

(21)

Supply Water Temperature

6 of 40

BOILER DESIGN (Boil DSGN) (

RESET RATIO

CHARACTERIZED HEATING CURVE

)

The Boil DSGN temperature is the supply water temperature required to heat the boiler zones when the outdoor air is as cold as the Outdoor Design temperature.

BOILER MINIMUM (Boil MIN) (

RESET RATIO

The Boil MIN is the lowest water temperature that the control is allowed to use as a boiler target (Boil TRG) if the 363 calculates a Boil TRG temperature that is below the Boil MIN setting, the Boil TRG temperature is adjusted to be at least the Boil MIN setting. During this condition, if the boiler is operating, the pointer turns on in the LCD while the Boil TRG or the Boil SUP temperature is viewed. If the installed boiler is designed for condensing

CHARACTERIZED HEATING CURVE

)

temperature. During mild conditions,

Minimum

Boil Min + 1/2 Boiler Differential

Boil Min - 1/2 Boiler Differential

Pointer On

Boil MIN

operation, set the Boil MIN adjustment to OFF.

BOILER MAXIMUM (Boil MAX) (

RESET RATIO

The Boil MAX is the highest water temperature that the control is allowed to use as a Boil TRG temperature. If the control does target Boil MAX, and the Boil SUP temperature is near the Boil MAX temperature, the

Maximum

temperature is viewed. At no time does the control operate the boiler

CHARACTERIZED HEATING CURVE

pointer turns on in the LCD while the Boil TRG or the Boil SUP

)

Pointer On

Boil Max + 1/2 Boiler Differential

Boil Max - 1/2 Boiler Differential

Pointer On

above 248˚F (120˚C).

WARM WEATHER SHUT DOWN (WWSD) OCC & UNOCC (

RESET RATIO

When the outdoor air temperature rises above the WWSD setting, the 363 turns on the is in Warm Weather Shut Down, the the heating system to satisfy this demand. The control does respond to either a

CHARACTERIZED HEATING CURVE

Boiler Demand

)

pointer is displayed if there is a demand. However, the control does not operate

WWSD

DHW Demand

pointer in the display. When the control

or a

Setpoint Demand

described in Section C.

BOILER SETBACK (Boil SETB) (

RESET RATIO

)

The Boil SETB is the amount that the boiler supply water temperature is reduced when the 363 is placed into an using an internal or an external setback as described in Section A. This setting is only available if the and

Setback / None

BOILER INDOOR (Boil INDR) (

CHARACTERIZED HEATING CURVE

DIP switch is set to

)

Setback

Reset Ratio

The Boil INDR is the room temperature used in the original heat loss calculations for the building. This setting establishes the beginning of the

Characterized Heating Curve

for the boiler zones. This single setting

replaces the Boil STRT water temperature and OUT STRT air temperature settings used by the

BOILER ROOM OCC & UNOCC (Boil ROOM) (

CHARACTERIZED HEATING CURVE

Reset Ratio

)

Boiler Characterized

Heating Curve

Boil MIN

Boil DSGN

The Boil ROOM is the desired room temperature for the boiler zones and it provides a parallel shift of the temperature desired by the occupants is often different from the designed indoor temperature (Boil INDR). If the room temperature is not

Characterized Heating Curve

. The room

WWSD Occ

WWSD Unocc

correct, adjusting the Boil ROOM setting increases or decreases the amount of heat available to the building. If the is set to

Occupied

Setback

and

UnOccupied

, a Boil ROOM setting must be made for both the

modes.

BOILER TARGET TEMPERATURE (Boil TRG) (

RESET RATIO

The Boil TRG temperature is determined from either the

Heating Curve

CHARACTERIZED HEATING CURVE

or the

Reset Ratio

settings and the outdoor air tempera-

Setback / None

)

Characterized

DIP switch

Boil IND

(27)

Boil ROOM Occ

Boil ROOM UnOcc

(16)

(5)

Outdoor Air Temperature

(-7)

ture. The control displays the temperature that it is currently trying to maintain as the boiler supply temperature. If the control does not presently have a requirement for heat, it displays “- - -” in the LCD.

7 of 40

Boil MAX

and operates as

UnOccupied

mode,

DIP switch is selected

Boil MAX

OUT DSGN

(-18)

-20

(-29)

210 (99)

190 (88)

170 (77)

150 (66)

130 (54)

110

(43)

(32)

(21)

(10)

Supply Water Temperature

DIFFERENTIAL (Boil DIFF)

An on / off heat source such as a boiler must be operated with a differential to prevent short cycling. This differential is centered around the Boil TRG temperature. If the boiler supply temperature drops 1/2 of the differential setting below the Boil TRG temperature, the 363 closes the boiler contact to fire the boiler. If the boiler supply temperature rises 1/2 of the differential setting above the Boil TRG temperature, the 363 opens the boiler contact to turn off the boiler. With the 363, either a fixed or automatic differential setting is selected. If the AUTO differential is selected, the 363 automatically adjusts the boiler differential setting under the current load conditions to minimize short cycling.

BOILER OPERATION

When the 363 determines that boiler operation is required, the

Boiler

contact terminals (12 and 13) close. While the boiler contact is

closed, the burner segment in the LCD is displayed.

BOILER PUMP (P1) OPERATION

The

Boiler Pump

also closes whenever the 363 receives a

contact (P1, terminal 8) closes whenever there is a boiler demand and the 363 is not in WWSD. The boiler pump contact

Mixing Demand

and is not in WWSD. Refer to the Mixing Reset Section D for more information.

For boiler pump contact operation during either DHW or Setpoint operation, refer to the DHW / Setpoint Section C.

BOILER PURGE (PURGE P1)

After the boiler demand is satisfied, the 363 continues to operate the

Boiler Pump

(P1, terminal 8) for a period of time. The length of time that

the boiler pump continues to run is adjustable (PURGE P1). This setting allows any excess heat to be purged out of the boiler after the burner is shut off. This also helps to prevent the water in the boiler from flashing into

or or

steam after the boiler is shut off. The boiler pump continues to run either until the purging time has elapsed or the Boil SUP temperature has dropped more than a differential below the Boil MIN setting. However, there must not be any motorized valves that will restrict water flow through the pump and boiler.

FIRE DELAY (FIRE DLY)

The FIRE DLY is the delay time that may happen between the time that the 363 closes the boiler contact and the burner fires. This delay is usually the result of a burner pre-purge or other forms of time delay built into the burner’s safety circuits.

BOILER MASS (Boil MASS)

The Boil MASS setting allows the 363 to adjust to different types of heat sources depending on their thermal mass.

Light

(LITE) 

The LITE setting is selected if the boiler that is being used has a low thermal mass. This means that the boiler has a very small water content and has very little metal in the heat exchanger. A boiler that has a low thermal mass comes up to temperature quite rapidly. This is typical of many copper fin-tube boilers.

Medium

(MED) 

The MED setting is selected if the boiler that is being used has a medium thermal mass. This means that the boiler either has a large water content and a low metal content or a low water content and a high metal content. This is typical of many modern residential cast iron boilers.

Heavy

(HEVY) 

The HEVY setting is selected if the boiler that is being used has a high thermal mass. This means that the boiler has both a large water content and 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 and steel tube boilers.

Section B2 —Alternate Boiler Demands

10K 1 ZONE CONTROL (10K 1 = Boil)

The 10K 1 item selects the type of device to be connected. Set the 10K 1 item to Boil to add a tekmar Zone control to the boiler loop. Control of boiler zones is then provided by a tekmar Zone Control connected to the

363. The Zone Control provides its own internal boiler demand to the 363. In this case, there is no need to provide an external boiler demand as described earlier in Section B1. The Zone Control is also capable of adjusting the Boil TRG temperature, if required, to provide improved building occupant comfort and system performance.

tekmar

Zone Control

Power

Occupied

UnOccupied

Heat Required

Optimum Start / Stop

24 hr. Timer

System Pump

Timer Active

70°F (21°C)

12 hrs.

Zone 1 / Lo stage /

Open / Cooling

• Dial the desired duration

618

of the UnOccupied period.

Zone 2 / Hi stage /

• Press start button at the time of day

Close / Ventilation

you want the UnOcc. period to begin.

Zone 3 / Lo stage

Timer Active light turns on.

Open

100

Zone 4 / Hi stage

(4)

(38)

UnOccupied

Duration

Zone 5 / Lo stage

Start

Open

Zone 6 / Hi stage

Close 0 = always Occupied 24 = always UnOccupied

Zone Control 367

One & Two Stage / One Stage & Floating

LR 58233

E150539

tekmar

363 Control

Mix Demand

View

Boiler Demand

DHW Demand Setpoint Demand WWSD

Minimum

DHW

Maximum

Item

Universal Reset Control 363

Mixing, Boiler & DHW

NRTL/C

LR 58223

8 of 40

Section C —Domestic Hot Water (DHW) and Setpoint

Pump

Section C1

Domestic Hot Water (DHW)

Section C2

DHW Priority

Section C3

DHW with Low

Temperature

Boilers

Section C1 —Domestic Hot Water (DHW)

DHW DEMAND

DHW demand

from a tekmar sensor.

External Demand

The 363 registers an external demand for DHW when a voltage between 24 and 240 V (ac) is applied across the aquastat or setpoint control is used as a switch in the DHW demand circuit. Once the 363 detects a DHW demand, the operates as described below.

Internal Demand Sensor

If the 10K 2 setting is selected as DHW, the 363 looks for a DHW sensor connected to the

10K 2

desired indirect DHW tank temperature. When the temperature at the DHW sensor drops 3˚F (1.5˚C) below the DHW TANK setting, the

DHW Demand

An advantage to using the DHW sensor is that the control can display the current DHW TANK temperature and record the highest and lowest DHW TANK temperatures. Also, the 363 can control the DHW temperature with more accuracy than when using an aquastat.

is generated on the 363 by one of two methods: either an external DHW demand from an aquastat or an internal demand

and the

DHW Demand

Com Dem

terminals (5 and 3). Either a DHW

pointer turns on in the LCD and the control

and the

(10K 2 = NONE)

Setp/DHW

(10K 2 = DHW)

Com Sen

terminals (18 and 17). The DHW TANK setting is used to set the

pointer turns on in the LCD and the control operates as described below.

Section C4

Setpoint

24 to 240 V (ac)

DHW

Storage Tank

Boil

Com

Dem

Aquastat

Com

Setp/

DHW

10K

DHW DEVICE (DHW THRU)

Once the 363 has received a of DHW device selected. The DHW device is selected using the DHW THRU item in the menu.

DHW Valve

If VALV is selected as the DHW device and there is a

Pmp / Vlv

flow through the DHW tank’s heat exchanger once the DHW valve is opened. The 363 operates the boiler to provide a sufficient boiler supply temperature to the DHW tank.

DHW Pump

If PUMP is selected as the DHW device, the 363 assumes that the DHW pump provides adequate flow through both the DHW tank heat exchanger and the boiler. To provide heat to the DHW tank, the 363 closes the boiler to provide a sufficient Boil SUP temperature to the DHW tank. If using a primary loop with the DHW tank piped in primary / secondary, select DHW VALV.

(VALV)

contact (9 and 10) and the

(PUMP)

BOILER TARGET DURING DHW GENERATION (Boil 0TRG)

The Boil TRG temperature during DHW operation depends on whether an external or internal demand is occurring. The DHW demand overrides the reset water temperature.

External Demand

If the control receives a as the DHW Heat Exchanger setting (DHW XCHG).

Internal Demand

If the control receives a TRG temperature is at least as hot as the DHW TANK setting plus 40˚F (22˚C).

DHW DURING UNOCCUPIED

The DHW operation during an that is being used. For this function to operate, the control must have the

(10K 2 = NONE)

(10K 2 = DHW)

DHW demand

UnOccupied

, the sequence of operation depends on the type

Valve

Adjust

DHW demand

Boil P1

contact (7 and 8). The boiler pump provides

DHW Pmp / Vlv

contact (9 and 10) and operates the

, the 363 closes the

DHW

through an external device such as an aquastat, the Boil TRG temperature is at least as hot

from a DHW sensor attached to the

period depends on the type of

9 of 40

10K 2

and the

DHW demand

Setback / None

Com Sen

that the 363 is receiving and the type of setback

DIP switch set to

terminals (18 and 17), the Boil

Setback

External Demand (Aquastat)

If an external

DHW Demand



is used, the control can either continue operation of the DHW system as it would during the

period or the control can ignore a call for DHW as long as the control is in an

UnOccupied

Occupied

mode.

Internal Demand (Sensor)

If an internal as long as the control is in an

Away



If the AWAY setting is made in the the DIP switch =

DHW Demand

Setback



is used, a DHW TANK

UnOccupied

Schd

mode.

menu, any

Unocc

temperature can be set. This is the temperature that the tank maintains

DHW Demand

is ignored and the tank cools off. Note: AWAY does not require

Section C2 —DHW Priority

DHW PRIORITY

It is often desirable to limit or even stop the flow of heat to the heating system when the DHW tank calls for heat. This allows faster recovery of the DHW tank. The 363 has a number of features that it can use when dealing with DHW priority. The features available depend on the type of DHW device that is being used and the type of

Mixing Priority

It can be selected that the DHW tank has priority over the mixing zones. If this option is chosen, the mixing device is throttled back on a call for DHW. The By reducing the mixing device output, more heat is directed to the DHW tank. The boiler zones continue to operate without change. This setting is available if DHW THRU is set to PUMP or VALV.

Boiler and Mixing Priority

It can be selected that the DHW tank has priority over the boiler and mixing zones. If this option is chosen, the mixing device is throttled back and the boiler pump (P1) turns off on a call for DHW. This setting is available only if a pump is selected as the DHW device (DHW THRU set to PUMP). Ensure that the flow rate of the DHW pump is adequate for both the DHW heat exchanger and the boiler.

DHW Demand

(DHW PRI = MIX) 

Mix P2

pump continues to operate based on the

Mix Demand

(DHW PRI = B+M) 

the control receives.

DHW

DHW PRIORITY OVERRIDE

To prevent the building from cooling off too much or the possibility of a potential freeze up during DHW priority, the 363 limits the amount of time for DHW priority. As the outdoor air temperature becomes colder, the length of time that the 363 provides DHW priority is reduced. Once the allowed time for priority has elapsed, the 363 overrides the DHW priority and operates DHW and heating simultaneously.

CONDITIONAL DHW PRIORITY

If the boiler supply temperature is maintained at or above the required temperature during DHW generation, this indicates that the boiler has enough capacity for DHW and possibly heating as well. As long as the boiler supply temperature is maintained near its target, DHW and heating occurs simultaneously.

DHW POST PURGE

After the

DHW Demand

is removed, the 363 performs a purge on the boiler. The 363 shuts off the boiler and continues to operate either the DHW pump or the DHW valve and the boiler pump. This purges the residual heat from the boiler into the DHW tank. The 363 continues this purge for a maximum of four minutes or until the boiler supply temperature drops 20˚F (11˚C) below the DHW Boil TRG temperature. The 363 also stops the purge if the boiler supply temperature drops below the current Boil TRG temperature.

DHW MIXING PURGE

After DHW 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. To avoid thermally shocking the boiler after DHW priority, the 363 shuts off the boiler, but continues to operate the DHW while restarting the heating system. This allows some of the DHW return water to mix with the cool return water from the zones and temper the boiler return water.

Increasing Air Temperature

Outdoor air temperature

Increasing Time

DHW priority demand time limit

10 of 40

Section C3 —DHW with Low Temperature Boilers (without Mixing)

If DHW is to be incorporated into a low temperature system such as a radiant heating system, a mixing device is often installed to isolate the high DHW supply temperature from the lower system supply 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 demand. This may result in damage to the low temperature heating system. The 363 is capable of providing DHW in such a system while ensuring that the low temperature in the heating system does not exceed its allowed maximum setting.

To prevent high temperature water from being introduced into the heating system, the Boiler Pump (P1) must be turned off during a call for DHW. To do this, DHW THRU must be set to PUMP, DHW PRI must be set to B + M, and Boil MIN must be set to OFF.

On a call for DHW, the 363 provides DHW priority by shutting off the Boiler Pump (P1) for a period of time. This time is based on the outdoor air temperature as described in the DHW Priority Override section. If the

Demand

is not satisfied within the allotted time, the boiler shuts off and the

boiler’s heat is purged into the DHW tank.

DHW

Sequence, Section C3

Once the boiler supply temperature is sufficiently reduced, the DHW pump

shuts off. Then the heating system is turned on for a period of time to prevent the building from cooling off. After a period of heating, if the DHW demand is still present, the 363 shuts off the heating system and provides heat to the DHW tank once again.

For correct operation, close attention must be paid to the mechanical layout of the system. When the 363 turns off the Boiler Pump (P1), flow to the heating system must stop. If flow is not stopped, the temperature in the heating system can exceed the maximum desired temperature and can result in damage to the heating system.

Section C4 —Setpoint

The 363 can handle setpoint loads which are high temperature loads connected to the boiler loop that are not heating loads or DHW. For this feature to be available, either a DHW sensor must be used or the DHW THRU item is set to NONE. If an external DHW demand is used as described in Section C1, you cannot use the setpoint feature.

SETPOINT DEMAND

The 363 registers a across the

Setp / DHW

setpoint demand pointer turns on in the LCD. The control operates the boiler to maintain at least the boiler supply temperature as set by the SETPOINT does not turn on the Boiler Pump (P1). If a setpoint load is used, the installer must make sure that the setpoint device provides its own flow through the boiler.

BOILER TARGET DURING SETPOINT (Boil TRG)

The Boil TRG temperature during a setting. This temperature is maintained as long as the 363 has a

Setpoint Demand

and the

Com Dem

Setpoint Demand

when a voltage between 24 and 240 V (ac) is applied

terminals (5 and 3). Once voltage is applied, the

Occ

setting. The

Setpoint Demand

is increased to at least the SETPOINT

Setpoint Demand

24 to 240 V (ac)

Com Dem

Setp/

Boil

DHW

Dem

SETPOINT SETBACK (SETPOINT UnOcc)

If the 363 is placed into setback, the operates normally. If a system override of AWAY is selected, the 363 operates the SETPOINT load at the

Setpoint Dem

SETPOINT PRIORITY (SETP PRI = B+M)

is ignored if the SETPOINT

UnOcc

setting is set to OFF. Otherwise, the setpoint

Occupied

setting.

For setpoint loads to have priority over the Boiler and Mixing zones, set SETP PRI to B + M. If this option is chosen, the output from the mixing device is suspended and the Boiler Pump (P1) turns off during a

Priority Override



Setpoint Demand

In order to prevent the building from cooling off too much or the possibility of a potential freeze up during setpoint priority, the 363 limits the amount of time for setpoint priority. As the outdoor air temperature becomes colder, the length of time the 363 provides setpoint priority is reduced. Once the allowed time for priority has elapsed, the 363 overrides the setpoint priority and operates setpoint and heating simultaneously.

Conditional Setpoint Priority



If the Boil SUP temperature is maintained at or above the required temperature during setpoint generation, this indicates that the boiler has enough capacity for setpoint and possibly heating as well. As long as the Boil TRG temperature is maintained, setpoint and heating occur at the same time.

11 of 40

Section D —Mixing Reset

Section D1

General Mixing

Operation

Section D2

Mixing Device

Section D3

Alternate Mixing

Demands

Section D1—General Mixing Operation

MIXING DEMAND

A mixing demand is generated by applying a voltage between 24 and 240 V (ac) across the applied, the in WWSD, the 363 closes the

ontrol turns on the boiler pump and mixing pump segments in the LCD.

The 363 calculates a MIX TRG supply temperature based on the outdoor air temperature and settings. If required, the 363 operates the boiler in order to provide heat to the mixing device.

MIXING START (MIX STRT)

The MIX STRT temperature is the mixing supply water temperature that the heating system requires when the outdoor air temperature equals the

OUT STRT

OUTDOOR START (OUT STRT)

The OUT STRT temperature is the outdoor air temperature at which the control provides the MIX STRT supply water temperature to the system.

OUTDOOR DESIGN (OUT DSGN) (

RESET RATIO

MIX DESIGN (MIX DSGN)

(

RESET RATIO

The MIX DSGN temperature is the supply water temperature required to heat the mixing zones when the outdoor air is as cold as the Outdoor Design temperature.

Mix Demand

air temperature.

terminals (1 and 2). Once voltage is

pointer is displayed in the LCD. If the 363 is not

Mix P2

contact and the

(

RESET RATIO

(

RESET RATIO

CHARACTERIZED HEATING CURVE

Boil P1

contact. The

)

24 to 240 V (ac)

Mixing Reset

Ratio

MIX STRT

OUT STRT

(27)

WWSD Occ

WWSD Unocc

(16)

40 (5)

Outdoor Air Temperature

Demand

MIX DSGN

MIX SETB

OUT DSGN

(-7)

Mix

MIX MAX

(-18)

-20

(-29)

210 (99)

190 (88)

170 (77)

150 (66)

130 (54)

110 (43)

(32

(21)

Supply Water Temperature

MIXING MAXIMUM (MIX MAX)

(

RESET RATIO

CHARACTERIZED HEATING CURVE

)

The MIX MAX sets the highest water temperature that the control is allowed to calculate as the MIX TRG temperature. If the control does target the MIX MAX setting, and the MIX SUP temperature is within 5˚F (3˚C) of the MIX MAX, the either the MIX TRG temperature or the MIX SUP

Maximum

pointer is displayed in the LCD while

temperature is

being viewed.

WARM WEATHER SHUT DOWN (WWSD) OCC & UNOCC (

RESET RATIO

CHARACTERIZED HEATING CURVE

)

When the outdoor air temperature rises above the WWSD setting, the 363 turns on the is in Warm Weather Shut Down, the heating system to satisfy this demand. The control does respond to either a

Mix Demand

pointer is displayed if there is a demand. However, the control does not operate the

DHW Demand

described in Section C.

12 of 40

y W

Pointer On Pointer On

WWSD

pointer in the display. When the control

or a

Setpoint Demand

and operates as

Mix MAX

+ 28 hidden pages

tekmar 363 Installation

User Interface

Table of Contents

Display

Symbol Description

Sequence of Operation

General Operation

Boiler Reset