Trane GEH General Information, option Boilerless Control/Electric Heat, option Hot Gas Reheat

General Information

(option) Boilerless Control/Electric

Heat

Systems that do not contain a boiler may contain a boilerless control with electric heat. Trane offers both a facto- ry mounted electric heat option, and a field mounted duct heater option.

If the 1/2 through 5 ton GEH and GEV unit incorporates the factory mounted option, the unit will ship from the fac- tory with an internally mounted nichrome open wire heating element, designed to start-up electric heat as the systems primary heat in the event entering water temperature falls be- low 55 F. Once the entering water tem- perature rises above 60 F, the boilerless controller returns the unit to normal compressor heating operation, and locks out the electric heater.

If the unit contains a cooling only heat pump design, the electric heat contac- tor is wired directly to the thermostat for primary heating, and the compres- sor contactor for cooling.

For units comprised of the field in- stalled duct heater option, the unit will ship from the factory with controls available to interface with the field provided electric heat selection.

Note: For geothermal applications, the boilerless controller has an adjustable setting of 25, 35, 45, 55 and 60 de- grees.

(option) Supplemental or

Boilerless Electric Heat

The 6 through 25 ton models which contain boilerless control electric heat or supplemental electric heat will con- tain the controls interface ONLY for field provided electric heat selection. The heater for this model shall be ex- ternal to the equipment by the contrac- tor for ease of installation. All power connections for the electric heater will be completely separate from the unit for field supplied electric heat.

Note: When the unit has boilerless control, the electric heat is not used as supplemental electric heat, but as a primary heat.

(option) Hot Gas Reheat

With the reheat option, the return-air from the space is conditioned by the air-to-refrigerant coil, then reheated by the reheat coil to control not only the space temperature, but to also re- duce the relative humidity of the space. When operating in the reheat mode (meaning the sensible tempera- ture has been met in the space), the humidistat signals the reheat relay coil to energize, allowing the high pres- sure refrigerant gas to flow from the compressor through the reheat valve, into the reversing valve, or reheat coil for dehumidification.

A switching relay has been provided for the reheat application to adjust the blower motor from normal operation to low speed when the hot gas reheat is energized (for 1/2 through 5 ton equipment only).

Notes:

•A high static blower motor is re- quired to support the hot gas re- heat option for the 1/2 through 5 ton equipment.

•Units containing the hot gas reheat option should not be used as a make-up air unit.

•Water regulating valves should not be used with the hot gas reheat op- tion. Trane places a thermal expan- sion valve on all WSHPs as well as GSHPs to regulate refrigerant flow vs. water flow to the unit.

6 WSHP-SVX01D-EN