14 | Constant Torque Motors (ECM) LM Series Heat Pump
LM Series Heat Pump8 733 905 315 (2013/9) Subject to change without prior notice
Dehumidification Method Selector
Dehumidification method selector (Figure #13,
item [11]) is used to select between the following
two methods:
1. 1) Units equipped with optional Hot Gas
Reheat, on dehumidification call (the “H”
terminal on the thermostat is energized) the
reheat outputs will energize the hot gas reheat
valve in the circuit and the heat pump will start
in dehumidification mode.
Dehumidificationselector (Figure #13, item
[11]) should be selected to ‘YES’.
2. Units without optional Hot Gas Reheat, on
dehumidification call, the heat pump fan will
operate at a lower speed to increase
dehumidification while cooling.
Dehumidification selector ((Figure #13, item
[11]) should be selected to ‘NO’.
Dehumidification indicator LED (Figure #13,
item [4]) will energize when dehumidification
call is present.
To the left of the red and green status LED’s is a
row of 1/4” male quick connects. These are used
to pass thermostat inputs on to the rest of the
control circuit. Remember to always turn off unit
power at the circuit breaker before attaching or
disconnecting any wiring from these connections
to avoid accidental short circuits that can damage
unit control components.
CONSTANT TORQUE MOTORS (ECM)
For installations where the efficiency of an
electronically commutated brushless DC motor
(ECM) motor is required, but the features of a
constant airflow motor are not required, the LM
series comes standard with the constant torque
ECM motor option. These motors feature up to
90% thermal efficiency combined with a flatter fan
curve than a PSC motor and simple operation.
These motors are provided with 5 speed taps to
allow for a wide range of air flow and external
static options.
To change a speed tap follow the instructions
below:
1. Disconnect power to the heat pump.
2. Remove the blower access panel.
3. Remove the speed tap wire from the terminal it
is currently connected to and connect it to the
terminal desired.
Refer to the constant torque motor performance
tables for heat pump blower performance with the
constant torque motor option. (Pg#35)
Do not set the ADJ DIP switch to the (-)
setting when electric heaters are installed.
Doing so may cause the heaters to cycle on
their thermal overload switches, potentially
shortening the life of the switches.
Always disconnect power before changing
DIP Switch position on the interface board
and reset the unit afterward.
In this mode, the heat pump will only dehumidify
the space when it is running in cooling mode.
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