Specifications

8-5. JIEATERPTHEXMOSTAT.
a. Heater Replacement.
1. Remove power positioner from service, close
supply air shutoff valve, and isolate
electrical power from power positioner.
2. Remove heating element (18, Figure 8-3)
from heater socket (16) by turning
counterclockwise.
3. Install new heating element (18) into socket
(16).
4. Return power positioner to service
b. Thermostat Replacement.
1. Remove power positioner from service, close
supply air shutoff valve, and isolate
electrical power from power positioner.
2. Remove terminal cover screws (7, Figure
8-3) and terminal cover (8). Remove
thermostat lead (9) from terminal 1 on
terminal block (12).
3. Remove screws (17) and heater socket (16)
from mounting plate (10). Remove
thermostat lead (15) from heater socket
4. Remove screws (1), lock washers (2), nuts
(4) and thermostat (3) from frame.
5. Install new thermostat (3) with screws (1),
lock washers (2) and nuts (4) on frame.
6. Connect thermostat lead (9) to terminal 1 on
terminal block (12).
7. Connect thermostat lead (15) to heater
socket (16) and reinstall heater socket with
screws (17).
8. Install terminal cover (8) with screws (7).
9. Restore electrical power and return
positioner to service.