Submittal
Job __________________________
Designer ______________________
Contact _______________________
Difference Setpoint Control 156
156_C
10/12
Alt. Energy
Replaces: 01/11
Submittal
© 2012 156_C - 10/12
1 of 2
A Watts Water Technologies Company
Features
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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 ΔT• hours to perform energy
calculation
CSA C US certified for use in the USA and
Canada
Solar Sensor 085 immersion type sensor
included
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Specifications
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The Difference Setpoint Control 156 is designed to transfer heat from an intermittent heat source to a storage tank. This control can
be used in applications ranging from solar thermal to wood boiler systems. Two sensors are used to measure the temperature at the
source and at the storage location, and begin heat transfer when there is a positive difference between them. This product uses a
single 240 V (ac) rated relay to accomplish this.
SPECIAL REQUIREMENTS
N / A
Difference Setpoint Control 156 On/Off
Literature 156_D, 156_A, D001, 070_D, 085_D
Control Microprocessor control. This is not a safety (limit) control
Packaged weight 0.8 lb. (360 g)
Dimensions 4-3/4” H x 2-7/8” W x 7/8” D (120 x 74 x 22 mm)
Enclosure White PVC plastic, NEMA type 1
Approvals
CSA C US, meets class B: ICES & FCC Part 15
Ambient conditions
Indoor use only, -20 to 120°F (-30 to 50°C), RH ≤90% Non-
condensing
Power supply 24 V (ac) ±10%, 50/60 Hz, 3 VA, 24 V (dc) ±10%, 0.03 A
Relays 240 V (ac) 10 A max, 1/3 hp
Sensors NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892
–Included 1 Universal Sensor 071 and 1 Solar Sensor 085
Warranty Limited 3 Year (See 156_D for full warranty)
Front View
Difference Setpoint
Control 156
On / Off
Item
Date Code
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
tektra 906-12
Meets Class B:
Canadian ICES
FCC Part 15
ΔT
Source Maximum
Minimum
Storage ΔT • hoursDiff’l
1234
CR
5
Com
6
Src
7
Stor
No Power
Signal wiring must be
rated at least 300V
Made in Canada
Power Relay
H3010B
2–7/8”
(74 mm)
4–3/4”
(120 mm)
Side View
7/8”
(22 mm)
Cover Off
Difference Setpoint
Control 156
On / Off
Item
Date Code
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
tektra 906-12
Meets Class B:
Canadian ICES
FCC Part 15
ΔT
Source Maximum
Minimum
Storage ΔT • hoursDiff’l
1234
CR
5
Com
6
Src
7
Stor
No Power
Signal wiring must be
rated at least 300V
Made in Canada
Power Relay
H3010B
1–3/8”
(37 mm)
3/4”
(18 mm)
3/4”
(18 mm)