36 | Options SM Series Heat Pump
SM Series Heat Pump6 720 220 406 (2013/1) Subject to change without prior notice
When the heat pump compressor operates, the
HRP will monitor the temperature of the discharge
gas from the compressor. Once discharge gas is
hot enough to provide useful heat to the domestic
water tank, the circulating pump will be enabled,
drawing water from the tank, through the HRP heat
exchanger and then depositing the heated water
back into the tank. If the water temperature
reaches 140 deg F, the circulating pump is
disabled to prevent over heating of the domestic
water. The HRP is provided with an on/off switch
in case the end user desires that the HRP be
inactivated (typically during the winter months
when space heating is most important).
Sound Package
The SM series is offered with a factory installed
sound reduction package option. This option
improves the already industry leading noise levels
of the heat pump by adding a heavy duty, multi
density blanket over the compressor. The
materials in the blanket are engineered to
attenuate the most objectionable frequencies of
sound coming directly off of the compressor shell,
further reducing the operating noise of the heat
pump.
Soft Start
The SM series are available with start assist device
as factory installed option.
Figure # 101
This device reduces starting current for
compressors by 25 to 60%. This reduction in
starting current can eliminate or greatly reduce
"light flicker" during compressor starts and can
reduce the required size of back-up
transformers. The adaptive technology of the
device can also extend compressor life by
providing smoother, lower current starts and by
protecting the compressor from transient low
voltage.
Constant Airflow Motor
The Constant Airflow Motor is an Electronic
Commutated Motor (ECM) that provides a
constant air flow over a wide range of external
static pressures, while optimizing the power
consumption of the motor.
This option allows the unit to have different air
flow settings depending on the mode that the unit
is operating; i.e heating, cooling, fan only, hot gas
reheat, etc.
DPS Water Flow Proving
The DPS water flow proving switch is a factory
installed option available for the SM series. The
DPS prevents compressor operation if there is
inadequate water flow through the water to
refrigerant heat exchanger in the heat pump.
The DPS operates by monitoring the water side
pressure drop across the water to refrigerant heat
exchanger. When the pressure drop between the
water in and water out lines reaches a pre-set
value, compressor operation is enabled.
Pump Relay
The factory installed pump relay can be used to
energize a supply pump or solenoid valve when
there is a call for compressor operation. This relay
can be used to switch either high or low voltage
power.
Comfort Alert Module
The Comfort Alert diagnostics module (CADM) is a
breakthrough innovation for troubleshooting heat
pump system failures. (Figure #102)
Figure # 102
If heat recovery unit is installed in an area
where freezing may occur, the unit must be
drained during winter months to prevent
heat exchanger damage. Heat exchanger
ruptures that occur due to freezing will void
the heat recovery package warranty along
with the heat pump warranty.
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