TM 5-4130-234-13&P
Functions of Controls, Indicators, and Connections (cont)
Panel Marking
Index No.
and/ or Reference
Control, Indicator
Designation
or Connection
Function
8
SG1
Scale
Displays quantity of refrigerant in reservoir.
9
REFRIG. GAUGE GA1
Gage
Measures high pressure.
10
REFRIG. GAUGE GA2
Gage
Measures low pressure.
To control refrigeration oil from beaker.
11
OIL FILL-CHARGE V7
Valve
To control filing of refrigerant reservoir.
12
REFRIG. CHARGE SYS FILL V5
Valve
To provide vacuum pump oil dram.
13
V8
Valve
To control charging of refrigeration system with refrigerant.
14
REFRIG. CHARGE SYS V4
Valve
To provide oil level indication for vacuum pump.
15
---
Glass Disk
Valve To provide vent for vacuum pump.
16
---
Vented-Exhaust
To connect gage GA2 to a pressure source.
17
LOW PRESS CP2
Union
To connect gage GA1 to a pressure source.
18
HI PRESS CP1
Union
Provides electrical connection for leak detector.
19
OUTPUT J1
Connector
Provides for connection of service unit to electric source.
20
PI
Connector
Selects reservoir heater or vacuum pump for operation.
21
HEATER ON OFF VAC ON S1
Switch
Controls electrical power to service unit.
22
115 V 60 HZ PWR ON-OFF CB1
Circuit Breaker
Indicates electrical power is applied to service unit, when lit.
23
115 V 60 HZ PWR,
Lamp
To connect refrigeration system to vacuum system.
24
VAC CP4
Union
To connect refrigeration system to vacuum system.
25
VAC CP3
Union
Measures vacuum pressure from sensing element of thermistor
26
M1
Gage
MT1.
a. Vent reservoir by uncapping and opening valves
c. Check that vacuum pump exhaust valve (16) is
(5, 12, 14, fig. 2-3).
finger torqued to closed (clockwise).
b. Evacuate reservoir and lines as follows:
d. Close valve 113. Set circuit breaker (22) to ON:
(1) Cap union (25).
lamp (231 must light. Set switch (21) to VAC ON and
(2) Connect hose assembly (8, fig. 2-4) with
observe gage (26) to make certain system will evacuate to
gaskets (2, 3) between union (24, fig. 2-3) and valve (5).
50 microns.
(3) Open valves (1, 2).
e. Set switch (21) and circuit breaker (22) to OFF.
(4) Close and cap valves (12, 14).
WARNING
(5) Set circuit breaker (22) to ON and switch (21)
Exercise care when flushing or cleaning
to VAC ON. Evacuate system to 200 microns as indicated
parts with refrigerant to prevent
on gage (26).
refrigerant from getting in the eyes or
(6) Close valve (5) and set switch (21) to OFF.
permanent damage to the eyes may
c. Warm or elevate liquid refrigerant bottle (Type
result.
F114, Federal Specification BB-F-1421)) to expedite filling.
f. Make certain all hose assemblies and lines are free
d. Remove hose assembly between union (24) and
from contamination.
If any doubt exists as to the
valve (5), and remove cap from valve (12).
cleanliness of hose assemblies and lines, flush each part
e. Loosely connect hose assembly (5, fig. 2-4) with
with refrigerant before connection to service unit of
gaskets (3) to valve (12. fig. 2-3) and connect other end of
refrigeration system.
hose assembly to the inverted refrigerant bottle.
NOTE
Since there are five basic modes of
operation of the service unit and each
Key to fig. 2-4:
7.
Hose Assembly
modes is not necessarily dependent on the
1. Cable Assembly
8.
Hose Assembly
others, operating instructions for each
2. Gasket
9.
Hose Assembly
mode are presented separately. See plate
3. Gasket
10.
Tube, Centrifuge
(182, fig. 5-2) for operating instructions and
4. Gasket
11
Detector, Leak
figures 2-1 and 2-2 for electrical and fluid
5. Hose Assembly
12.
Oil
schematics. See figure 2-3 for controls,
6. Hose Assembly
13.
Pump, Oil
indicators, and connections and table 2-1
for their functions
2-3.
Filling Reservoir with Refrigerant
NOTE
When reservoir is partially full omit steps a
and b and proceed directly to step c.
2-6
