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RELAYS (K3, K4, AND K5) TEST (continued)
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TM-5-4120-359-14 Air Conditioner Split Package 18 000 BTU/HR Cooling 30 000 BTU/HR Heating 208 Volt 3 Phase 400 Hertz Manual
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Figure 4-53. Relay (K3, K4 and K5)
TM 5-4120-359-14
(4) Using multimeter, check control voltage between K4 terminals X1 and X2. Voltage should be 25 to 31 Vdc.
(5) Turn selector switch to OFF.
d. To test relay K:
(1) Turn mode selector switch to HIGH HEAT and temperature control switch to maximum WARMER.
(2) Using multimeter, check voltage (power out) between K5 terminals:
A2 and B2
B2 and C2
A2 and C2
Voltage should be 197 to 229 Vac.
(3) Using multimeter, check voltage (power in) between K5 terminals:
A1 and B1
B1 and C1
A1 and C1
Voltage should be 197 to 229 Vac.
(4) Using multimeter, check control voltage between K5 terminals X1 and X2. Voltage should be 25 to 31 Vdc.
(5) Turn selector switch to OFF.
e. Remove power to air conditioner.
4-53. RELAYS (K3, K4, AND K5)
For tests, see paragraph 4-52.
Preliminary Procedures: Remove evaporator section electrical module assembly. (See paragraph 4-41.)
a. Access
(1) Using screwdriver, remove six screws and lock washers.
(2) Lift top cover off.
4-113

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