Refrigeration Maintenance
86
Charging the System
1. Insure that all compartment bulkheads are
open. Ceiling mounted bulkheads should not
be stored close to the evaporator outlets as this
will restrict airflow.
2. Determine the correct charge for the unit as
configured. The actual weight of the charge
may vary somewhat due to length of
refrigerant lines.
3. The unit should still be in Evacuation mode.
Add as much of the charge as possible as
liquid through the discharge service valve and
receiver tank outlet valve.
4. Back seat and crack the discharge service
valve.
5. Back seat the receiver tank outlet valve.
6. Crack the suction service valve.
7. Exit the Evacuation mode by turning the
Zone1/Host On/Off switch Off, and then back
On.
8. Turn all zones On and set all zone setpoints
for the lowest possible temperature to insure
that all zones run in Cool mode. Allow the
unit to start.
9. Cover the condenser as required to maintain
discharge pressure from 325 to 400 psig (2241
to 2758 kPa) and add the remaining charge by
weight as liquid through the suction service
valve.
10. If necessary, continue to add refrigerant until
the ball in the receiver tank sight glass is
floating but is no higher than 1/2 way up the
glass. If they system is overcharged, remove
refrigerant until the ball in the receiver tank
sight glass is floating but is no higher than 1/2
way up the glass.
11. Continue to operate the unit and monitor the
sight glass until all compartment temperatures
are at or below 0 F (-18 C).
12. If the receiver tank sight glass level drops, add
additional refrigerant as required to maintain
refrigerant in the bottom 1/2 of the sight glass.
13. When refrigerant level is correct back seat all
service valves, remove the gauge manifold,
and securely replace valve stem covers with
seals and service port caps before returning
the unit to service.
Содержание 002008
Страница 4: ...4 ...
Страница 25: ...Unit Description 25 Figure 3 Zone 1 Cool Zone 2 Cool and Zone 3 Cool Zone 3 Zone 2 Zone 1 AGA168 ...
Страница 27: ...Unit Description 27 Figure 4 Zone 1 Cool Zone 2 Cool and Zone 3 Heat Zone 3 Zone 2 Zone 1 AGA169 ...
Страница 30: ...Unit Description 30 Figure 9 Front View AJA920 ...
Страница 31: ...Unit Description 31 1 Access Panels 2 Defrost Damper Figure 10 Back View 1 2 ARA104 ...
Страница 114: ...Mechanical Diagnosis 114 ...
Страница 116: ...Electric Standby Diagnosis 116 ...
Страница 120: ...Remote Evaporator Specifications 120 ...
Страница 122: ...Remote Evaporator Maintenance Inspection Schedule 122 ...
Страница 128: ...Remote Evaporator Electrical Maintenance 128 ...
Страница 132: ...Remote Evaporator Refrigeration Service Operations 132 ...
Страница 134: ...Remote Evaporator Structural Maintenance 134 ...
Страница 136: ...Remote Evaporator System Diagnosis 136 ...
Страница 140: ...Index 140 ...
Страница 142: ......
Страница 143: ...143 Model 30 Schematic Diagram Page 1 of 2 ...
Страница 144: ...144 Model 30 Schematic Diagram Page 2 of 2 ...
Страница 145: ...145 Model 30 Wiring Diagram Page 1 of 4 ...
Страница 146: ...146 Model 30 Wiring Diagram Page 2 of 4 ...
Страница 147: ...147 Model 30 Wiring Diagram Page 3 of 4 ...
Страница 148: ...148 Model 30 Wiring Diagram Page 4 of 4 ...
Страница 149: ...149 Model 50 Schematic Diagram Page 1 of 2 ...
Страница 150: ...150 Model 50 Schematic Diagram Page 2 of 2 ...
Страница 151: ...151 Model 50 Wiring Diagram Page 1 of 5 ...
Страница 152: ...152 Model 50 Wiring Diagram Page 2 of 5 ...
Страница 153: ...153 Model 50 Wiring Diagram Page 3 of 5 ...
Страница 154: ...154 Model 50 Wiring Diagram Page 4 of 5 ...
Страница 155: ...155 Model 50 Wiring Diagram Page 5 of 5 ...