FIG. 30 |
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.
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.
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FIG. 31
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.
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.
FIG. 32
STEP FOUR
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.
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.
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