State Industries SBD85 500 - Manual (Page 25)

SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
24
STEP 7 THERMOSTAT TEST
STEP 7. THERMOSTAT TEST. Set the thermostat to call for heat. Using your
multimeter, test for 24 VAC between right terminal and ground.
IF THEN
The meter does not read 24 VAC and the jumper wire
between the high limit and the thermostat is in place:
•
Replace the thermostat
The meter reads 24 VAC:
•
Go to step 8.
Note: If the high limit to thermostat jumper wire was disconnected earlier to simulate a satisfied
thermostat, reconnect the jumper to the terminals.
Note: A yellow wire from this thermostat terminal connects to the damper PC board.