Figure 4-7 Dual Vacuum Pump Connections; Charging The Refrigerant System - Carrier SUPRA 850Mt Operation And Service Manual

7.
7.
7.
8.
Figure 4-7 Dual Vacuum Pump Connections
4.8

CHARGING THE REFRIGERANT SYSTEM

4.8.1 Installing a complete charge
a. Dehydrate unit and leave in deep vacuum. (Refer to
section 4.7)
b. Place refrigerant cylinder on scale and connect
charging line from cylinder to receiver outlet (king)
valve. Purge charging line at outlet valve.
c. Note weight of refrigerant cylinder.
d. Open liquid valve on refrigerant cylinder. Open king
valve half way and allow the liquid refrigerant to flow
into the unit until thecorrect weight of refrigerant has
been added as indicated by scales. Correct charge
will be found in Table 2-1.
9.
1.
1.
1.
5.
1. Evaporator Coil
2. Condensator Coil
3. Receiver
4. Receiver Service Valve
5. Discharge Service Valve
6. Suction Service Valve
7. Manometer
8. Vaccum Pump
9; Vaccum meter
4-11
2.
6.
It is possible that all liquid may not be pulled into the
receiver, as outlined in step d. In this case, vapor
charge remaining refrigerant through the suction
service valve.
e. When refrigerant cylinder weight (scale) indicates
that the correct charge has been added, close liquid
line valve on cylinder and backseat the king valve.
4.8.2 Checking the refrigerant charge
Start unit in cooling mode. Run approximately ten
minutes. Partially block off air flow to condenser coil so
discharge pressure rises to 14.8 kg/cm
The unit is correctly charged when the lower receiver
sight glass is full and no refrigerant is in the upper
receiver sight glass.
4.
3.
8.
NOTE
(210 psig).
@
62--611XX- -20 (03/04)
7.