12 | Options LM CS Series Heat Pump
LM CS Series Heat Pump8 733 920 847 (2014/01) Subject to change without prior notice
OPTIONS
Number of factory installed options are available
on LM CS Series of Heat Pumps. The following
details the purpose, function and components of
each option.
Pump Status Switch
The pump status switch is a Current Transformer
(CT) that monitors the current flow from the
condenser pump motor. It’s default is Normally
Open (NO) when the motor is not running, and
closes once it senses current flow.
DPS Water Flow Proving
The DPS water flow proving switch is a factory
installed option available for the LM 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 the refrigerant
heat exchanger. When the pressure drop between
the water in and water out lines reaches a pre-set
value, compressor operation is enabled.
Valve End Switch
The leaving water valves are all equipped with
Valve End Switches (VES) and it is a factory
installed option available for the LM series.
The VES prevents compressor operation if the
valve is not fully open. This prevents short-cycling
due to low water through the water-to-refrigerant
heat exchanger in the heat pump.
The VES only closes once the leaving water valve is
fully open. The valve is activated by the
compressor call (Y1) signal.
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.
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