|
| |
TM5-4120-376-14
CHAPTER 2
OPERATING INSTRUCTIONS
INTRODUCTION. This chapter contains a functional description of the major components of
the air conditioner. It explains how to operate the air conditioner.
SECTION I. DESCRIPTION AND USE OF OPERATOR’S CONTROLS AND INDICATORS
2-1. OPERATOR’S CONTROLS. This section describes, locates and illustrates the various
controls and provides the operator sufficient information to ensure proper operation of this air
conditioner. The location and function of controls and instruments are illustrated as shown on
the Control Module. Other information and illustrations are provided to ensure proper
operation of the air conditioners.
a. Control Circuit Breaker. The control circuit breaker is a safety device which provides
overcurrent protection for the control circuit of the unit. The control circuit breaker is not a
control switch to be used for operating the unit. This breaker should always be maintained in
the ON position. If the breaker trips to the OFF position, an electrical defect in the control
circuit is indicated and corrective action should be taken. Manually resetting the circuit
breaker to ON restores electrical continuity.
b. Compressor Circuit Breaker. The compressor circuit breaker is a safety device which
provides overcurrent protection for the compressor. The compressor circuit breaker is not a
control switch to be used for operating the unit. This breaker should always be kept in the ON
position. If the breaker trips to the OFF position, a defective compressor or related defective
electrical components, or faulty wiring, is indicated. Inadequate input power voltage will also
cause the circuit breaker to trip. The unit control circuit is also connected to auxiliary
contacts on the compressor circuit breaker. When this circuit breaker trips to OFF, it
disconnects the control circuit allowing the time delay relay to reset and the refrigerant system
pressures to equalize. Manually resetting the compressor circuit breaker to ON restores
electrical continuity.
c. Temperature Selector Switch. The temperature selector switch is a thermostatic switch
which responds to temperature variations from 60°F in the maximum cooler position to 90°F
(15.6°C to 32.2°C) in maximum warmer position. The best preliminary adjustment of the
temperature seletor is midway between the cooler and warmer positions, corresponding to
approximately 75°F (24°C). A ten minute period should be allowed between adjustments of the
temperature selector for the full effect of the adjustment to be realized. Once the desired
temperature of the air conditioner space is obtained, no further adjustment is required for
either cooling or heating modes of operation.
2-1
|
