TM 9-4120-395-14&P
2-2.
OPERATOR'S CONTROLS - Continued.
a. System switch can be set to:
(1) HEAT
- System will only heat.
(2) OFF
- Heating/cooling is turned off.
(3) COOL
- System will only cool.
b. Fan switch can be set to:
(1) AUTO
- Fan comes on when system is cooling or heating.
(2) ON
- Fan is on all of the time.
c. Normal switch can be set to:
(1) NORM
- Compressor and heater element operate normally.
(2) EMERG. HEAT - Compressor is bypassed, allowing only electrical heat. Indicator light illuminates.
d. Thermostat lever: set to desired temperatures.
2-3.
INDICATORS.
a.
EMERG. HEAT Light. An indicator light on the thermostat cover illuminates when the thermostat normal
switch is set to EMERG. HEAT. See Figure 2--1.
b.
Thermometer. A thermometer on the front of the thermostat cover provides an indication of the current
temperature of the surrounding air. See Figure 2-1.
Section II. OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
para.
INTRODUCTION .......................................................................................................................................................... 2-4
2-4.
INTRODUCTION.
a.
General. Your Preventive Maintenance Checks and Services table lists the inspections and care of your
equipment required to keep it in good operating condition.
(1) Before you operate. Always keep in mind the CAUTIONS and WARNINGS. Perform your before (B)
PMCS.
(2) While you operate. Always keep in mind the CAUTIONS and WARNINGS. Perform your during (D)
PMCS.
(3) After you operate. Be sure to perform your after (A) PMCS.
(4) If your equipment falls to operate. if your equipment does not perform as required, refer to Chapter 3
under Troubleshooting for possible problems. Report any malfunctions or failures on the proper DA
Form 2404, or refer to DA PAM 738-750.
b.
PMCS Columnar Entries.
(1) Item number column. This is the order in which you perform checks and services on the air
conditioner. The entry in this column will also be used as a source of item numbers for the "TM Item
Number" column on DA Form 2404, Equipment Inspection and Maintenance Worksheet, in recording
results of PMCS.
(2) Interval columns. The interval column of your PMCS table tells you when to do a certain check or
service.
(3) Item to Check/Service. Identification of item to be inspected.
(4) Procedures column. The procedures column of your PMCS table tells you how to do the required
checks and services. Carefully follow these instructions. If you do not have the tools, or if the
procedure tells you to, have the next higher level of maintenance do the work.
2-2
