Installation
Refer to Table 5 for filter/filter drier recommendations.
Liquid Line Moisture Indicator Sight Glass
To aid in troubleshooting, install a moisture indicator sight glass in the liquid line near the evaporator, down stream of the solenoid valve prior to any branch takeoffs to the expansion valve. The sight glass should not be used to determine adequate refrigerant charge or
Refer to Table 6 for solenoid valve/moisture indicator sight glass recommendations.
Liquid Line Solenoid Valves
Liquid line isolation solenoid valves are required for refrigerant migration control into the evaporator during the “Off” cycle and should be connected as illustrated in the applicable field connection diagram.
Under certain conditions, liquid line solenoid valves may be used to trim the amount of active evaporator as compressors unload. Generally, the trim solenoid valve is unnecessary on comfort cooling VAV systems, and is only required on CV systems when dehumidification is a concern.
Refer to Table 6 for solenoid valve/moisture indicator sight glass recommendations.
Thermostatic Expansion Valve (TEV)
Trane recommends a
In order to get proper refrigerant distribution into the coil, an expansion valve is required for each coil distributor.
Access Valves (Ports)
The access ports in the liquid line allows the unit to be charged with liquid refrigerant and is used to determine
The access ports in the suction line allows the operating suction pressure to be checked across the suction line filter. These ports are usually a Schraeder valve with core.
Ball Shutoff Valves
The ball shutoff valve allows for isolation of the Filter/Filter Drier for easier core replacement.
Two ball shutoff valves equal to the OD Tubing size for both the liquid line and suction line are required.
Frostat™ Coil Frost Protection
The Froststat control is the preferred method of coil frost protection. The Frostat control bulb is mechanically attached to the suction line near the evaporator and wired to the unit control panel. Refer to the proper field connection diagram for details.
Table 5. Filter/Filter Drier Recommendations
| Suction Line | Filter Core | Liquid Line | Filter Drier Core |
Capacity | (Sporlan) | (Sporlan) | (Sporlan) | (Sporlan) |
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|
20 Ton | ||||
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|
25 Ton | ||||
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|
|
30 Ton | ||||
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|
|
40 Ton | ||||
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|
|
50 Ton | ||||
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|
|
|
|
60 Ton |
Note: Use specific parts listed or equivalent. (Per Circuit)
32 |