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If the operating pressures, sight glass, superheat and subcooling readings indicate a refrigerant shortage,
leak check the unit and confirm using soap bubbles and repair all the leaks prior to gas-charge refrigerant
into circuit until operating conditions become normal.
Table 9 Unit operation status
Operation
Water side approach temperature range (°C)
Mode
Cooling
2~4
Heating
2~6
NOTICE - Equipment Damage!
Use only refrigerants specified on the unit nameplate and Trane OIL00317. Failure to do so may
cause compressor damage and improper unit operation.
CAUTION - Personal injury!
Avoid breathing refrigerant vapour and any contact with liquid or gas.
Vapourising refrigerant liquid causes rapid cooling and contact may cause cold burns, frostbite,
even through normal gloves.
NOTICE - Efficiency Decline!
Each RTXC XE unit is factory leak-tested, refrigerant charged and tested for proper operations prior
to shipment. The shipment is made with a waiting charge and should be completed by refrigerant
charge on site. Identify and repair eventual leak points before field charge to avoid refrigerant over
charge and excessive power consumption.
Unit Shut-down
Temporary Shutdown and Restart
To shutdown for a short time is used for control operation, maintenance or to repair the unit, use the
following procedure.
1. Press the STOP key on the TD7. The compressors will continue to operate and, after unloading for 20
seconds, will stop all the compressor and the fans as well.
2. Ensure that power is available to the unit and UC800 controlled pump at all times, even during the off-season,
so that to energize pump and circulate water to prevent evaporator from freezing during low ambient
temperature and refrigerant migration. Also make sure that the evaporator anti-freeze heaters have power.
3.
Press the AUTO key to restart the unit in previous mode.
NOTICE - Equipment Damage!
When unit is in temporary shutdown, UC800 controlled water pump and evaporator heater
combination will protect the evaporator from freezing during to low ambient temperature and
refrigerant migration.
This option will NOT protect the evaporator in the event of any power failure to the unit, water pump
or evaporator heaters. The Trane warranty does not cover damage due to the freezing.
Leaving water temperature -
Saturated suction temperature
Saturated discharge temperature
- Leaving water temperature
Air side approach temperature range (C)
Saturated discharge temperature -
15~20
Outdoor air temperature - Saturated
8~12
45
Outdoor air temperature
suction temperature
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