Manual 2100-652A
Page
20 of 42
When the thermostat is set in the automatic mode,
the thermostat can change automatically to the heat
or cool modes to maintain the temperature set on the
thermostat.
The CO
2
controller will energize the vent option and the
ID blower when the room CO
2
levels rise over set level.
Default CO
2
set point is 950 ppm (see Figure 23 on
page 33).
Climate Control
Options B & C
are an electronic,
programmable thermostat and (CO
2
controller on
C Model only) with BACnet MS/TP or Ethernet
connections.
The thermostat can be set in the heat, cool or
automatic mode. When the thermostat is set in
the heat mode, it can heat only to maintain the
temperature set on the thermostat. When the
thermostat is set in the cool mode, it can cool only
to maintain the temperature set on the thermostat.
When the thermostat is set in the automatic mode,
the thermostat can change automatically to the heat
or cool modes to maintain the temperature set on the
thermostat.
On Option C Models only,
the CO
2
sensor in the
controller will energize the vent option and the ID
blower when the room CO
2
levels rise over set level.
Default CO
2
set point is 950 ppm.
NOTE:
On Option X, field-provided means to control
ventilation must be used if any of the motorized
ventilation options are installed.
LOW VOLTAGE CONNECTIONS
These units use a grounded 24 volt AC low voltage
circuit.
The
“R”
terminal is the
hot
terminal and the
“C”
terminal is
grounded.
“G”
terminal or pins 6 and 1 of P2 are the
fan inputs
.
Both must be energized
for proper fan operation. This
is done automatically in the factory installed climate
R
O
F
S
N
O
I
T
C
E
N
N
O
C
E
G
A
T
L
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L
O
R
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N
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CAUTION
Do not plug in or unplug blower motor
connectors while the power is on. Failure to do
so may result in motor failure.
control options. If the climate control option is
abandoned and connections are made directly to P2
both pins 6 and 1 of P2 must be energized for proper
operation.
“Y”
terminal or pin 7 of P2 is the
compressor input
.
“B”
terminal or pin 8 of P2 is the
reversing valve input
.
The reversing valve must be energized for heating
mode.
“R”
terminal or pin 10 of P2 is
24 VAC hot
.
“C”
terminal or pin 11 of P2 is
24 VAC grounded.
“L”
terminal or pin 12 of P2 is
compressor lockout
output
. This terminal is activated on a high or low
pressure trip by the electronic heat pump control. This
is a 24 VAC output.
“W2”
terminal or pin 9 of P2 is
second stage heat
(if
equipped). If the unit is equipped with an optional
hot water coil plenum box or electric heat these will be
energized by this terminal.
“O1”
terminal of pin 5 of P2 is the
ventilation input
.
This terminal energizes any factory installed ventilation
option.
“E”
terminal or pin 3 of P2 is the
emergency heat
input.
This terminal energizes the emergency heat
relay.
NOTE:
For total and proper control using DDC, a total
of 6 controlled outputs are required (5 if no
ventilation system is installed). For proper
system operation under Emergency Heat
conditions. Where the compressor needs to
be deactivated, the B-W2-E outputs need to
be energized. Removing the Y (compressor)
signal alone turns the compressor off, but does
not activate the additional circuitry embedded
in the heat pump for proper and complete
operation.
GENERAL
This unit is equipped with a variable speed ECM motor.
The motor is designed to maintain rated airflow up to
the maximum static allowed.
It is important that the
blower motor plugs are not plugged in or unplugged
while the power is on. Failure to remove power prior
to unplugging or plugging in the motor could result in
motor failure.
