Application Brochure

1 of 4 © 2010 A 156 - 06/10
A 156
06/10
- Application Brochure
Difference Setpoint Control 156
Application A 156-1
System Description: The tekmar Difference Setpoint Control 156 operates the pump P1 whenever the temperature
difference between the collector and the storage tank is greater than the ΔT Setpoint. The control turns off the pump
if the temperature of the storage tank exceeds a maximum setting or if the temperature at the collector drops below a
minimum setting.
Concept Drawing: This is only a concept drawing, not an engineered drawing. It is not intended to describe a complete system, nor any particular system. It is up to the
system designer to determine the necessary components for and configuration of the particular system being designed, including additional equipment, isolation relays
(for loads greater than the control’s specified output ratings), and any safety devices which in the judgement of the designer are appropriate, in order to properly size,
configure and design that system and to ensure compliance with building and safety code requirements.
24 V (ac)
N
R
C
115 V (ac)
Class II
Transformer
L
P1
S1
S2
5
Com
6
Src
7
Stor
No Power
156
1
R+
32
RelayPower
C
-
4
120 V (ac)
24 V (ac)
Class II
Transformer
S1
P1
S2
156
Solar Collector
Mechanical
P1 = On/Off Pump
S1 = Source Sensor 085
S2 = Storage Sensor 071
Electrical
P1 = On/Off Pump
S1 = Source Sensor 085
S2 = Storage Sensor 071