4-2
T-288
center hose as well as each other. When the low
and high side valves are frontseated (closed), the
high and low side hoses are isolated from each
other and the center hose. It is in the front seated
(closed) position that system pressures can be
monitored.
When
both
valves
are
open
(backseated), pressure will cause vapor to flow
from the high side to the low side across the
compressor. When only the low side valve is
opened, it is possible to add refrigerant in vapor
form to the system.
To Discharge Service or
Manual Liquid Line Port
Red
(Refrigeration
or Evacuation)
Hose
Yellow
(Refrigeration)
Hose
Blue
(Refrigeration
or Evacuation)
Hose
Red Knob
Blue Knob
Opened
(Backseated)
Hand Valve
Closed
(Frontseated)
Hand Valve
To Suction Service Port
Low Pressure Gauge
High Pressure Gauge
A. Connection to
Low Side of System
B. Connection to
High Side of System
C. Connection to Vacuum
Pump, Refrigerant Cylinder
or Oil Container Purge Line
High Side Field
Service Coupling
Low Side Field
Service Coupling
A
B
C
Hose Fittings
(0.500-16 Acme)
Hose Fitting
(0.500-16 Acme)
Hose Fitting
with O’Ring
Hose Fitting
with O’Ring
Figure 4-2. R-134a Manifold Gauge Set Connections
To service the refrigerant system, the manifold
gauge set is connected to the compressor suction
(low side) service valve
for low pressure
connection and either the compressor discharge
(high side) service valve or the filter drier inlet or
outlet valve for high pressure connection. The high
pressure connection
will depend
upon the
component to be serviced. (Refer to section 4.)
a.
At the Compressor
1. Backseat both suction and discharge service
valves
2. Frontseat manifold set hand valves.
3. Connect low side (blue) manifold hose to the
compressor suction service valve. Open valve
on manifold hose to depress service port
schrader valve.
4. Connect high side (red) manifold hose to the
compressor discharge service valve. Open
valve on manifold hose to depress service port
schrader valve.
5. Midseat both suction and discharge service
valves on compressor to read refrigerant
pressures.
b.
At the Compressor Suction Service Valve and
Filter-Drier Inlet or Outlet Valve
1. Backseat both suction and discharge service
valves
2. Frontseat manifold set hand valves.
3. Connect low side (blue) manifold hose to the
compressor suction service valve. Open valve
on manifold hose to depress service port
schrader valve.
Summary of Contents for Carrier TRANSICOLD 68RM35-604-20
Page 1: ...T 288 Rearmount 68RM35 604 20 R 134a NYCDOT...
Page 20: ...2 3 T 288 Figure 2 2 Automatic High Speed Cool Mode Operation with Reheat TDR 10 SEC...
Page 21: ...2 4 T 288 Figure 2 3 Automatic High Speed Cool Mode Operation No Reheat TDR 10 SEC...
Page 22: ...2 5 T 288 Figure 2 4 Automatic High Speed Heat Mode Operation Below 45_F Ambient TDR 10 SEC...
Page 43: ...5 3 T 288 Figure 5 2 Electrical Schematic Diagam Based on Drawing 68RM35 1038 12 TDR 10 SEC...
