tekmar 374 Universal Reset Control - Manual (Page 17)

17 of 36 © 2009 D 374 - 03/09
Boiler Demand
To generate a Boiler Demand, a voltage between 24 V (ac) and 230 V (ac) must be
applied across the Boil Dem and the Com Dem terminals (30 and 31).
Caution: The same power supply must be used to power the Boiler Demand, DHW
Demand and the Setpoint Demand circuits since they share the
Com Dem terminal.
DHW Demand
To generate a DHW Demand, a voltage between 24 V (ac) and 230 V (ac) must be
applied across the DHW Dem and Com Dem terminals (29 and 31).
Caution: The same power supply must be used to power the Boiler Demand, DHW
Demand and the Setpoint Demand circuits since they share the
Com Dem terminal.
Setpoint Demand
To generate a Setpoint Demand, a voltage between 24 V (ac) and 230 V (ac) must be
applied across the Setp Dem and Com Dem terminals (28 and 31).
Caution: The same power supply must be used to power the Boiler Demand, DHW
Demand and the Setpoint Demand circuits since they share the
Com Dem terminal.
Mix 1 Demand
To generate a Mix 1 Demand, a voltage between 24 V (ac) and 230 V (ac) must be
applied across the Mix 1 Dem and the Com Dem terminals (25 and 26).
Caution: The same power supply must be used to power the Mix 1 Demand and the
Mix 2 Demand circuits since they both share the
Com Dem terminal.
Mix 2 Demand
To generate a Mix 2 Demand, a voltage between 24 V (ac) and 230 V (ac) must be
applied across the Mix 2 Dem and the Com Dem terminals (27 and 26).
Caution: The same power supply must be used to power the Mix 1 Demand and the
Mix 2 Demand circuits since they both share the
Com Dem terminal.
Output Connections
Primary Pump Contact (Prim P1)
The Prim P1 output terminal (16) is a powered output. When the relay in the
control closes, 115 V (ac) is provided to the Prim P1 terminal (16) from the Power L
terminal (14). To operate the primary pump, connect one side of the primary pump
circuit to terminal 16 and the second side of the pump circuit to the neutral ( Power N)
side of the 115 V (ac) power supply.
30 31
Boil
Dem
Com
Dem
24 to 230 V (ac)
29
DHW
Dem
30
Boil
Dem
31
Com
Dem
24 to 230 V (ac)
Aquastat
29
DHW
Dem
30
Boil
Dem
31
Com
Dem
28
Setp
Dem
24 to 230 V (ac)
25 26
Mix1
Dem
Com
Dem
24 to 230 V (ac)
26 27
Com
Dem
Mix2
Dem
24 to 230 V (ac)
14
L
15 16
Prim
P1
Power
N
N
L
115 V (ac)