Manual

© 2009 D 374 - 03/09 22 of 36
Stage 2 / Setp Enable Contact
If an on / off boiler is connected to the Stage 2 / Setp Enbl. terminals (23 and 24),
make sure power to the boiler circuit is off, and install a jumper between the terminals.
When the boiler circuit is powered up, the boiler should fire. If the boiler does not
turn on, refer to any installation or troubleshooting information supplied with the
boiler. (The boiler may have a flow switch that prevents firing until the primary pump
(Prim P1) or boiler pump (P2) is running). If the boiler operates properly, disconnect
the power and remove the jumper.
To test the second stage of a two stage boiler, the Lo fire must be firing before the Hi
fire will operate. Once the Low stage is firing, test the Hi fire stage in the same way as
an on / off boiler.
When the Boiler Sensor Return / Supply DIP switch is set to Return, the setpoint
enable contact can be used to provide a setpoint demand to the boiler’s internal
control if applicable.
DHW Pump Or Valve (DHW Pmp / Vlv)
If a DHW pump or DHW valve is connected to the DHW Pmp / Vlv terminals (19 and 20),
make sure the power to the pump or valve circuit is off and install a jumper between
those terminals. When the DHW circuit is powered up, the DHW pump should turn on
or the DHW valve should open completely. If the DHW pump or valve fails to operate,
check the wiring between the terminals and the pump or valve and refer to any
installation or troubleshooting information supplied with these devices. If the DHW
pump or valve operates correctly, disconnect the power and remove the jumper.
Variable Speed Injection Pump
Mix 1
If a variable speed injection pump circuit is connected to the Cls Var1 terminals (2),
make sure the power to the terminal block is off and install a jumper between the
Pwr Mix and Cls Var1 terminals (3 and 2). When the variable speed pump circuit
is powered up, the variable speed pump should operate at full speed. If the pump
does not operate, check the wiring between the terminal block and the pump and
refer to any installation or troubleshooting information supplied with the pump. If
the pump operates properly, disconnect the power and remove the jumper.
Mix 2
If a variable speed injection pump circuit is connected to the Cls Var2 terminals (5),
make sure the power to the terminal block is off and install a jumper between the
Pwr Mix and Cls Var2 terminals (3 and 5). When the variable speed pump circuit
is powered up, the variable speed pump should operate at full speed. If the pump
does not operate, check the wiring between the terminal block and the pump and
refer to any installation or troubleshooting information supplied with the pump. If
the pump operates properly, disconnect the power and remove the jumper.
Mixing Valve Actuator
Mix 1
If a floating action actuating motor circuit is connected to the Pwr Mix, Opn and Cls Var1 terminals (3, 1 and 2), make sure
power to the motor circuit is off and install a jumper between the Pwr Mix and Opn terminals (3 and 1). When the circuit is
powered up, the actuator should move in the opening direction. If it does not, check the wiring between the terminals and
the actuating motor. Refer to any installation or troubleshooting information supplied with the motor. If the motor closes
instead of opening, the wiring of the actuating motor must be reversed. If the valve opens correctly, turn off the power to
the circuit and remove the jumper. Install a jumper between the Pwr Mix and Cls Var1 terminals (3 and 2). When the circuit
is powered up, the actuator should move in the closing direction. If it does not, check the wiring between the terminals and
the actuating motor. Refer to any installation or troubleshooting information supplied with the motor. If the motor closes
correctly, turn off the power to the circuit and remove the jumper.
24
23
Stage 2/
Setp Enbl.
20
19
DHW
Pmp/Vlv
24 V (ac) to 230 V (ac)
or
L
N
3
2
115 V (ac)
N
L
Cls1
Var1
Pwr
Mix
4
5
Opn
2
Cls2
Var2
3
Pwr
Mix
115 V (ac)
L
N