tekmar 156 User Manual
- Data Brochure
Difference Setpoint Control 156
D 156
06/10
The Difference Setpoint Control 156 is designed to operate an on/off pump to transfer heat from a heat source to a storage
tank. The control operates based on a setpoint temperature difference (T). The relay turns on when the T rises above
the setpoint and turns off when the T falls below the setpoint less the differential. The Source Minimum and Storage
Maximum settings turn off the relay when heat transfer is no longer desirable. Potential applications include using solar
collectors or a wood boiler as a heat source.
Additional functions include:
24 V (ac) OR 24 V (dc) power supply
•
Monitor Minimum & Maximum temperatures for Source & Storage
•
Displays number of running hours of the relay
•
Displays T• hours to perform energy calculation
•
CSA and UL certified for use in the USA and Canada
•
NEW Solar Sensor 085 immersion type sensor included!
•
Input
24 V (ac or dc)
Power Supply
Meets Class B:
Canadian ICES
FCC Part 15
Made in Canada
tektra 906-12
ΔT
Source Maximum
Storage ΔT • hoursDiff’l
Power: 24 V (ac) ±10% 50/60 Hz 3 VA
24 V (dc) ±10% 0.03 A
Relay: 240 V (ac) 10 A 1/3 hp
Item
Difference Setpoint
Control 156
1234
Power Relay
CR
On / Off
Signal wiring must be
rated at least 300V
Minimum
No Power
5
Com6Src7Stor
H3010B
Date Code
Input
Universal Sensor
Included
Output
Primary
Pump
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Input
Solar Sensor
Included
How to Use the Data Brochure
This brochure is organized into three main sections.
They are: 1) Sequence of Operation, 2) Installation, and
3) Display Menus.
Table of Contents
User Interface ...............................................................2
Display and Symbol Description ...................................3
Sequence of Operation .................................................3
Powering up the Control ...............................................3
Setpoint Operation ........................................................3
T Setpoint ...................................................................4
Maximum Storage Setpoint ..........................................4
Minimum Source Setpoint ............................................4
Using T•hours to Calculate Heat Transfer ..................5
The Display Menus section of this brochure describes the
various items that are adjusted and displayed by the control.
The control functions of each adjustable item are described
in the Sequence of Operation.
Temperature Monitoring ................................................5
Installation ....................................................................5
Display Menus ..............................................................8
Default Menu ................................................................ 8
Program Menu ............................................................ 10
Error Messages .......................................................... 11
Technical Data ............................................................ 12
Limited Warranty ........................................................ 12
User Interface
The 156 uses a Liquid Crystal Display (LCD) as the method
of supplying information. Use the LCD in order to set up
and monitor the operation of your system. The 156 has
three push buttons (Item, ▲, ▼) for selecting, viewing, and
adjusting settings. When programming the control, record
settings in the PRGM menu table which is found in the
second half of this brochure.
Item
The selected item will be displayed using a pointer in the
display. To view the next available item, press and release
the Item button. Once you have reached the last available
item, pressing and releasing the Item button will return the
display to the first item.
Item
Adjust
To make an adjustment to a setting in the control, press and
hold simultaneously for 1 second all three (3) buttons. The
display will then show the word PRGM on the left side of the
screen. Then select the desired item using the Item button.
Finally, use the ▲ or ▼ button to make the adjustment.
Item
View Current Setpoints
While viewing temperatures, a quick and easy way to view
current setpoints is to press and hold either the Item, ▲,
or ▼ button.
Press and hold the Item button to view the current T
Setpoint.
Press and hold the ▲ button to view the current Minimum
Source Setpoint.
Press and hold the ▼ button to view the current Maximum
Storage Setpoint.
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Display
°°F°
Menu Field
Displays the
current menu
Item Field
Displays the current
item selected.
Symbol Description
POINTER
▼
Displays the control operation as
indicated by the text.
∆T
Minimum
Source Maximum
Storage ∆T • hoursDiff’l
Item
°C
°F, °C
Units of measurement
Number Field
Displays the current value
of the selected item
Status Field
Displays the current
status of the relay.
Buttons
Selects Menus, Items
and adjusts settings
HEAT RELAY
HEAT
Displays when the HEAT relay is
closed.
Sequence of Operation
Powering Up the Control
When the Difference Setpoint Control 156 is powered up,
all segments are displayed in the LCD for 2 seconds, and
then the type number is displayed for 2 seconds. Next,
Setpoint Operation
Source
Sensor
Heat
Source
Pump
Heat
Storage
Storage
Sensor
PRGM
the software version is displayed for 2 seconds. Finally,
the control enters into the normal operating mode and by
default the LCD displays the current T temperature.
The Difference Setpoint Control 156 has two control points;
heat source and storage. The heat source could be a solar
collector or wood boiler while the heat storage is typically
a storage tank. The control is looking at the temperature
difference (∆T) between the source and storage to determine
when to close the relay and start the heat transfer. The
setpoint operation that follows will explain the on and off
points of the relay.
PROGRAM MENU
Program the control settings.
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T SETPOINT
The control measures the difference between the source and the storage temperatures (T). When the measured T is
greater than the T setpoint, the relay is turned on to transfer heat from the source to the storage. If the T drops below
the T Setpoint less the T Differential, the relay is turned off.
∆T
Setpoint
OFF
Increasing T
Increasing Time
ON
OFF
ON
OFF
∆T Differential
Relay operation showing
the turn on and turn off
points with respect to the ∆T
Setpoint and ∆T Differential.
Typical Settings ∆T Setpoint Differential
With a heat exchanger 15 to 25°F (8 to 14°C)
Without a heat exchanger 13 to 21°F (7 to 12°C)
10 to 15°F
(6 to 8°C)
MAXIMUM STORAGE SETPOINT
If the measured storage temperature rises above the Maximum Storage Setpoint, the relay is turned off. The relay remains
off until the storage temperature drops below the Maximum Storage Setpoint less the Maximum Storage Differential.
The Maximum Storage Setpoint stops the transfer of heat when the storage temperature rises above the Maximum
Storage Setpoint, which prevents the storage tank from over heating. Turning off the relay allows heat to be drawn out of
the tank to satisfy any heating loads without heat being returned to the tank from the heat source, thus lowering the tank
temperature.
Max Storage
Setpoint
ON
Increasing
Temperature
OFF
ON
Increasing Time
OFF
Increasing Time
ON
Max Storage
Differential
Relay operation showing the
turn on and turn off points with
respect to the Max Storage
Setpoint and Differential.
MINIMUM SOURCE SETPOINT
If the measured source temperature drops below the Minimum Source Setpoint, the relay is turned off. The relay remains
off until the source temperature rises above the Minimum Source Setpoint plus the Minimum Source Differential.
The Source Minimum Setpoint does not provide freeze protection; it only stops the transfer of heat when the source
temperature falls below the Minimum Source Setpoint. The heat source is still susceptible to freezing. Turning off the relay
allows the heat source to gain heat by stopping the heat transfer to the storage tank.
Increasing Time
ON
OFF
Min Source
Setpoint
Increasing
Temperature
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Increasing Time
OFF
ON
OFF
Min Source
Differential
Relay operation showing the
turn on and turn off points with
respect to the Min Source
Setpoint and Differential.
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