Options | 37SM Series Heat Pump
6 720 220 406 (2015/02)Revised 02-15
OPTIONS
Number of factory installed options are available
on SM Series of Heat Pumps. The following details
the purpose, function and components of each
option.
Hot Gas Reheat (HGRH)
Hot gas reheat is an active dehumidification option
available on the SM series that cools and
dehumidifies return air, and then reheats it back to
approximately entering dry bulb temperature using
waste compressor heat. In this way, a unit with Hot
Gas Reheat can efficiently remove humidity from
the return air without altering the sensible
temperature of the space.
The reheat option consists of a refrigerant to air
heat exchanger (reheat coil) mounted down
stream of the evaporator coil and a refrigerant
diverting valve. When there is a signal for
dehumidification AND the sensible space
temperature is satisfied, the unit will operate in
reheat mode. In reheat mode the heat pump will
operate at full load cooling and will divert
discharge gas from the compressor to the reheat
coil, effectively cooling and dehumidifying the air
and then reheating it back to a temperature close
to the entering dry bulb temperature. If there is a
call for sensible cooling while the unit is operating
in the reheat mode, then the unit will revert to
cooling until the sensible demand is satisfied.
Electric Heat
Internally mounted supplemental electric heat is
available on select models of the SM series.
Electric heating elements can operate along with
reverse cycle heating as auxiliary heat or in lieu of
mechanical heating (refrigeration heating) as
emergency backup heat.
Availability matrix, including available nominal kW
capacities is shown below:
Heat Recovery Package (HRP)
The heat recovery package is a factory installed
option on SM series of heat pumps. The HRP can
be used to heat potable water during unit
operation using waste heat from the compressor
discharge gas. In some cases the HRP can provide
most or all of the hot water requirements for a
typical home.
The HRP consists of three major components:
• double wall, vented refrigerant to water heat
exchanger
•circulating pump
•control circuit
Hot Gas Reheat (HGRH) Option is not available
on SM024 model or on models with Electric
Heat installed.
NOTE: Heat pumps with hot Gas Reheat
need to be connected to a humidistat along
with a traditional thermostat or a
combination thermostat/humidistat.
Internal mounted Electric Heat is only available
on top blow vertical cabinets, end blow
horizontal cabinet or on down blow counterflow
cabinets. Electric Heat is not available on units
with HGRH.
In cases where Electric Heat is not available in
a desired configuration but is needed, contact
your distributor for available Duct Mounted
Electric Heat Package.
NOTE: Internal electric heat cannot be provided
with hot gas reheat. Units with internal electric
heat must have 2 field power supplies.
Heater
Model
KW Stgs Btu/h Product Series Compatibility
208V 230V 208V 230V SM024 SM036 SM048 SM060 SM070
HK050-1201 3.6 4.8 1 12300 16300 xxxxx
HK100-1201 7.2 9.6 2 24600 32700 x # x xxx
HK150-1201 10.8 14.4 2 36900 49100 x # xxx
HK200-1201 14.4 19.2 2 49200 63400 x # x x
x Available
# Only available for units with ECM Constant Airflow Motor.
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