Table 11 Ð Capacity Control Steps Ð
30HW Standard Units
UNIT | CAPACITY CONTROL | CAPACITY | OPERATING | |
30HW | STEPS* | % | CYLINDERS | |
018 | 1 | 33.3 | 2 | |
2 | 66.7 | 4 | ||
| 3 | 100.0 | 6 | |
025 | 1 | 50.0 | 2 | |
2 | 100.0 | 4 | ||
| ||||
028 | 1 | 33.3 | 2 | |
2 | 66.7 | 4 | ||
| 3 | 100.0 | 6 | |
035 | 1 | 33.3 | 2 | |
2 | 66.7 | 4 | ||
| 3 | 100.0 | 6 | |
040 | 1 | 33.3 | 2 | |
2 | 66.7 | 4 | ||
| 3 | 100.0 | 6 |
SERVICE
ELECTRIC SHOCK HAZARD
To avoid the possibility of electrical shock, turn off all power to unit before servicing.
Do not attempt to bypass,
Compressor Replacement Ð If a replacement
Be sure all the hardware from the old compressor is removed and installed on the new compressor, including the
The compressor can be removed from either the front or the sides of the unit, depending on where clearance space was allowed during unit installation. The compressor and mount- ing hardware are mounted on a plate which is screwed down to the unit basepan. Remove the 4 screws holding the plate to the basepan and the plate should easily slide out of the unit. Mount the replacement compressor to the plate, slide the plate back into the unit and secure with the 4 screws.
Circuit Breaker(s) Ð The breaker(s) provides
NOTE: One circuit breaker is provided per compressor.
1.Disconnect the
2.Check that the replacement heat exchanger is the same as the original heat exchanger. For the condensers, compare part numbers on the heat exchangers. For the coolers, in- sulation covers the manufacturer's part number. Make sure the depths of the replacement and original cooler heat ex- changers are the same.
3.Reclaim the refrigerant from the system, and unsolder the
4.Remove the four
5.Install the replacement heat exchanger in the unit and attach to the bracket using the four
6.Carefully braze the refrigerant lines to the connections on the heat exchanger. Lines should be soldered using silver as the soldering material with a minimum of 45% silver. Keep the temperature below 1472 F (800 C) under nor- mal soldering conditions (no vacuum) to prevent the cop- per solder of the brazed plate heat exchanger from changing its structure. Failure to do so can result in internal or external leakage at the connections which cannot be repaired.
7.Reconnect the water/brine lines.
8.Dehydrate and recharge the unit. Check for leaks.
The mesh screens in front of the water/brine inlets of the heat exchangers should be cleaned periodically, depending on condition of the chiller water/brine.
To clean the condenser tubes manually:
1.Order tubing brushes (Carrier part no. KC21AH105).
2.Close the valves on the condenser and relieve condenser water pressure. BE SURE TO PROVIDE DRAINAGE TO PREVENT WATER DAMAGE.
3.Remove the condenser heads and brush the tubes clean, removing scale and other deposits.
4.Inspect the head gaskets and replace if necessary.
5.Clean all gasket surfaces prior to reassembly.
6.Replace the water heads and torque the head bolts to 90
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