TM 9-4120-395-14&P
4-29. HEAT RELAY.
This task covers:
a. Inspection
b. Testing
c. Removal
d. Installation
INITIAL SETUP:
TooIs:
Tool Kit, service, refrigeration unit
Equipment Conditions:
Power off at power source.
Both front door assemblies removed. See para 4-17.
Control box cover removed. See para 4-23.
General Safety Instructions:
Disconnect input power to the unit before performing any internal maintenance.
Voltages used can kill. Shutting the unit off at the thermostat does not disconnect
unit power.
a.
Inspection.
(1) Check the two screws (1, Figure 4-25) attaching the heat relay (2) to the control box (3). Tighten if re-
quired.
(2) Install the control box cover. See para 4-23.
(3) Install both front door assemblies. See para 4-17.
b.
Testing.
(1) Check the heat relay (2, Figure 4-25) with a multimeter. The multimeter should show the relay opening
and closing as you manually open and close the contact points.
(2) Install the control box cover. See para 4-23.
(3) Install both front door assemblies. See para 4-17.
c.
Removal.
(1) Tag and disconnect all wires to the heat relay (2, Figure 4-25).
(2) Remove the two screws (1) from the heat relay (2) and pull the heat relay out of the control box (3).
d.
Installation
(1)
Install the heat relay (2, Figure 4-25) In the control box (3) with the two screws (1).
(2)
Connect the wires as tagged and remove the tags.
(3)
Install the control box cover. See para 4-23.
(4)
Install both front door assemblies. See para 4-17.
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