Carrier 69NT40-489-100 Series, Руководство по эксплуатации и обслуживанию

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58 T-305
gauge/hose set is available from Carrier Transicold.
(Carrier Transicold P/N 07-00294-00, which includes
items 1 through 6, Figure 24, page 58.) To perform
service using the manifold gage/hose set, do the
following:
a. Preparing Manifold Gauge/Hose Set For Use
1. If the manifold gauge/hose set is new or was
exposed to the atmosphere it will need to be eva-
cuated to remove contaminants and air as follows:
2. Back seat (turn counterclockwise )both field service
couplings (see Figure 24, page 58) and midseat both
hand valves.
3. Connect the yellow hose to a vacuum pump and re-
frigerant 134a cylinder.
4. Evacuate to 10 inches of vacuum and then charge
with R-134a to a slightly positive pressure of 0.1 kg/
cm
@
(1.0 psig).
5. Front seat both manifold gauge set valves and dis-
connect from cylinder. The gauge set is now ready
for use.
To Low Side
Service Port
To High Side
Service Port
- Red
- Yellow
Blue
Red Knob
Blue Knob
1
2
3
3
3
4
5
4 2
6
1. Manifold Gauge Set
2. Hose Fitting (0.5-16 Acme)
3. Refrigeration and/or Evacuation Hose
. (SAE J2196/R-134a)
4. Hose Fitting w/O-ring (M14 x 1.5)
5. High Side Field Service Coupling
6. Low Side Field Service Coupling
Figure 24. R-134a Manifold Gauge/Hose Set
b. Connecting Manifold Gauge/Hose Set
Connection of the manifold gauge/hose set (see
Figure 24) is dependent on the component being
serviced. If only the compressor is being serviced, the
high side coupling is connected to the discharge service
valve. For service of the low side (after pump down), the
high side coupling is connected to the liquid line service
valve. The center hose connection is brought to the tool
being used. To connect the manifold gauge/hose set, do
the following.
1. Remove service valve stem caps and check to make
sure they are backseated. Remove service port
caps. (See Figure 22)
2. Connect the high side field service coupling (see
Figure 24) to the discharge or liquid line valve ser-
vice valve port.
3. Turn the high side field service coupling knob (red)
clockwise, which will open the high side of the sys-
tem to the gauge set.
4. Connect the low side field service coupling to the
suction service valve port.
5. Turn the low side field service coupling knob (blue)
clockwise, which will open the low side of the system
to the gauge set.
6. To read system pressures: slightly midseat the high
side and suction service valves.
-BLUE
D S
-YELLOW
-RED
1
2
3
4
5
6
7
8
9
10
11
12
13
1. Discharge Service
Valve
2. Compressor
3. Suction Service Valve
4. Receiver or Water
Cooled Condenser
5. Liquid Service Valve
6. Vacuum Pump
7. Low Side Hose
8. Center Hose
9. High Side Hose
10. Electronic Vacuum
Gauge
11. Manifold Gauge Set
12. Refrigerant Cylinder
13. Reclaimer
Figure 25. Refrigeration System Service
Connections
CAUTION
To prevent trapping liquid refrigerant in the
manifold gauge set be sure set is brought to
suction pressure before disconnecting.
c. Removing the Manifold Gauge Set
1. While the compressor is still ON, backseat the high
side service valve.
2. Midseat both hand valves on the manifold gauge set
and allow the pressure in the manifold gauge set to
be drawn down to suction pressure. This returns any
liquid that may be in the high side hose to the system.
3. Backseat the suction service valve. Backseat both
field service couplings and frontseat both manifold
set valves. Remove the couplings from the service
ports.
4. Install both service valve stem caps and service port
caps (finger-tight only).