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Relay 9 / DHW
If a DHW pump or DHW valve is connected to the Relay 9 /
DHW contact (30 and 31) (FIG. 30), 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 sup-
plied with these devices. If the DHW pump or valve oper-
ates correctly, disconnect the power and remove the
jumper.
ƽ SENSOR AND UNPOWERED INPUT CONNECTIONS
Do not apply power to these terminals as this will dam-
age the control.
Outdoor Sensor
If an outdoor sensor is used, connect the two wires from the
Outdoor Sensor TST2311 to the Com - and Out + terminals
(1 and 4) (FIG. 31). The outdoor sensor is used by the con-
trol to measure the outdoor air temperature.
Boiler Supply Sensor
Connect the two wires from the TST2311 sensor to the Com
- and Boil Sup terminals (1 and 2) (FIG. 31). The boiler sup-
ply sensor is used by the control to measure the boiler sup-
ply water temperature.
Boiler Return Sensor
If a boiler return sensor is used, connect the two wires from
the TST2311 sensor to the Com - and Boil Ret terminals (1
and 3) (FIG. 31). The boiler return sensor is used by the
control to measure the boiler return water temperature.
UnOccupied Switch
If an external timer or switch is used, connect the two wires
from the external switch to the Com - and UnO Sw terminals
(1 and 5) (FIG. 32). When these two terminals are shorted
together, the control registers an UnOccupied signal.
S
TEP FOUR ----- TESTING THE WIRING
ƽ GENERAL
Each terminal block must be unplugged from its header on
the control before power is applied for testing. To remove
the terminal block, pull straight down from the control.
The following tests are to be performed using standard test-
ing practices and procedures and should only be carried out
by properly trained and experienced persons.
FIG. 30
1
Com
–
2
Boil
Sup
3
Boil
Ret
4
Out
+
2
3
4
Com
–
Boil
Sup
Boil
Ret
Out
+
2
1
3
4
Com
–
Boil
Sup
Boil
Ret
Out
+
1
FIG. 31
19
FIG. 32