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6 WSHP-SVX01D-EN
(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.
General
Information