Bosch SM070 Specifications Page 34

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34 | SM Series Heat Pump
SM Series Heat Pump6 720 220 406 (2013/9) Subject to change without prior notice
Dehumidification Method Selector
Dehumidification method selector (Figure #99,
item [11]) is used to select between the following
two methods:
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 #99, 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 #99, item
[11]) should be selected to ‘NO’.
3. 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.
Dehumidification indicator LED (Figure #99, item
[4]) will energize when dehumidification call is
present.
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 positions 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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