Trane RAUC-C60, RAUC-C50 Liquid Line Moisture Indicator Sight Glass, Liquid Line Solenoid Valves

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 sub-cooling. Actual temperature measurements are required to determine proper charge and sub-cooling.

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 balance-ported externally equalized valve in order to maintain satisfactory superheat control down to lower valve loading conditions and to compensate for pressure drops between the expansion valve and superheat control point (evaporator refrigerant outlet).

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 sub-cooling.

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)
20 Ton	RSF-4817-T	RPE-48-BD	C-485-G	RCW-48
25 Ton	RSF-4817-T	RPE-48-BD	C-487-G	RCW-48
30 Ton	RSF-4817-T	RPE-48-BD	C-487-G	RCW-48
40 Ton	RSF-4817-T	RPE-48-BD	C-485-G	RCW-48
50 Ton	RSF-4817-T	RPE-48-BD	C-487-G	RCW-48
60 Ton	RSF-4817-T	RPE-48-BD	C-487-G	RCW-48

Note: Use specific parts listed or equivalent. (Per Circuit)

32 SS-SVX09A-EN