TM 5-4520-241-14
TS 4520-241-14/4-16
Figure 4-16. HEATER-OFF-FAN switch wiring.
4-23.
TIME DELAY TRANSFORMER.
a. Testing. Test the time delay transformer as follows before removing it from the heater case.
WARNING
The space heater contains dangerous voltages which can cause severe electrical
shock. When making tests with power applied, take care to prevent contact with
live circuits.
(1) Open the front and side access doors. Locate the time delay transformer under the terminal strip next to the
carburetor. Connect a DC voltmeter to the terminals with the red and yellow wires.
(2) Momentarily move the HEATER-OFF-FAN switch to HEATER. The voltmeter must indicate 23 to 30 volts
DC. If there is no voltage, or if the voltage is out of range, replace the transformer as described below.
b. Replacement .
WARNING
This space heater contains dangerous voltages which can cause severe electrical
shock. Be sure to disconnect the power plug before repairing the heater.
4-48