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ARMY TM 9-4120-381-14
NAVY EE-000- CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
Para
Title
Page
4-68
Evaporator (Circulator) Motor and Housing Assembly .........................................................
4-131
4-69
Fan Belt (Evaporator Motor and Housing Assembly) ...........................................................
4-132
4-70
Evaporator Motor (B1) .........................................................................................................
4-134
4-71
Circulator Fan (Evaporator) ................................................................................................
4-136
4-72
Pulleys 60 Hz, Green (Evaporator Motor and Circulator Fan) ..............................................
4-139
4-73
Pulleys 50 Hz, Red (Evaporator Motor and Circulator Fan) .................................................
4-141
4-74
Condenser Motor and Housing Assembly ............................................................................
4-143
4-75
Fan Belt (Condenser Motor and Housing Assembly) ...........................................................
4-144
4-76
Condenser Motor (B3) .........................................................................................................
4-146
4-77
Circulator Fan (Condenser) .................................................................................................
4-148
4-78
Pulleys 60 Hz, Green (Condenser Motor and Circulator Fan) ..............................................
4-151
4-79
Pulleys 50 Hz, Red (Condenser Motor and Circulator Fan) .................................................
4-153
4-80
Electric Heater (EH).............................................................................................................
4-155
4-81
Compressor Crankcase Heater (CCH) .................................................................................
4-158
4-82
Dirty Filter Switch (S3).........................................................................................................
4-160
4-83
High Temperature Switch (S6).............................................................................................
4-162
4-84
Air Flow Switch (S8) ............................................................................................................
4-164
4-85
Heat Control Thermostat (S9) .............................................................................................
4-166
4-86
Low Ambient Temperature Thermostat (S 3) ......................................................................
4-168
4-87
Cool Control Thermostat (S14) ...........................................................................................
4-170
4-88
Solenoid Valves (LI and L2) Coil Removal ..........................................................................
4-172
4-89
Condenser Fan Connecting Link Assembly .........................................................................
4-174
4-90
Condenser Coil ...................................................................................................................
4-176
4-91
Evaporator Coil ...................................................................................................................
4-178
4-92
Drain Areas ........................................................................................................................
4-180
4-93
Preparation for Storage or Shipment ...................................................................................
4-182
4-18. FUNCTIONAL DESCRIPTION. The air conditioner control circuits are described in the following paragraphs (see
NO TAG and Figure FO-1).
4-19. AIR CONDITIONER CONTROL.
NOTE
The air conditioner utilizes a hot gas bypass system to maintain temperature control
instead of switching the compressor on and off each time air temperature crosses the
threshold of the control setting.
a.
Control Power. Transformer (T1) and rectifier (CR1) form a simple, unfiltered power supply providing +24 V dc
for operation of control relays and LED fault indicators. When +24 V dc is present in the unit, control relay (K19)
remains energized and interrupts ac power to fault lamp indicator (DS9) (control power fault). When control
power fails, K19 is de-energized and restores ac power to DS9.
b.
Mode Select Switch. When set to AUTO or REMOTE, MODE SELECT SWITCH (St) applies ac power to
thermostats, contactors, and solenoids. When set to cool, S1 applies dc control power (+24 V dc) to energize
control relay (K1 8), and operate contactors (K8 thru K10), and relay (K21). When set to COOL, only cooling or
pumpdown operations are allowed. When set to HEAT position, S1 applies dc control power to energize control
relay (K7) and operates contactor (Kl1). When set to HEAT, cooling thermostat (S14) is disabled, and switch
(S9) controls heating operation.
c.
Evaporator Fan Circuit. Three phase ac power is applied to evaporator fan motor (81) when contactor (K8) is
energized. The contactor may be energized by select switch (S1), control relay (K7), or control relay (K18).
Current overloads (K12 thru K14) are integral to the contactor (K8).
d.
Heater Circuit. Three phase ac power is applied to electric heater elements (EH) when contactor (K 1) is
energized.
4-32
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