Manual 2100-578L
Page
21 of 42
The standard unit includes a remote thermostat
connection terminal strip. See Figures 11 through 16
for connection diagrams. Compatible thermostats are
listed in Table 4.
LOW VOLTAGE CONNECTIONS FOR DDC CONTROL
Fan Only
Energize G
Cooling Part Load
Energize G, Y1
Cooling Full Load
Energize G, Y1, Y2
HP Heating Part Load
Energize G, Y1, B/W1
HP Heating Full Load
Energize G, Y1, Y2, B/W1
HP Heating Full Load + Electric Heat
(up to 10KW)
Energize G, Y1, Y2, B/W1, W2
Heating with Bank #1 Electric Heat Only
Energize G, W2
Emergency Heat (
Heat pump operation
is negated for this condition
)
Energize G, W2, W3
Ventilation
Energize A
LOW VOLTAGE CONNECTIONS
These units use a grounded 24 volt AC low voltage
circuit.
“G”
terminal is the
fan input
.
“Y1”
terminal is the
compressor part load input
.
“Y2”
terminal is the
compressor full load input
.
“B/W1”
terminal is the
reversing valve input
.
The reversing valve must be energized for heating mode.
“R”
terminal is
24 VAC hot
.
“C”
terminal is
24 VAC grounded.
“L”
terminal is
compressor lockout
output
. This
terminal is activated on a high or low pressure trip and
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.
TABLE 4 – Wall Thermostats
condensate overflow trip by the electronic heat pump
control. This is a 24 VAC output.
“W2”
terminal is
first stage electric heat
(if equipped).
First stage electric heat can be operated simultaneously
with the heat pump operating.
“A”
terminal is the
ventilation input
. This terminal
energizes any factory installed ventilation option.
“W3”
terminal is
second stage electric heat
. When
“W3” terminal is energized, it locks out compressor
operation to limit discharge air temperature and
required branch circuit ampacity.
NOTE:
For total and proper control using DDC,
a minimum of 9 controlled outputs are needed
when above 10KW Electric Heat is employed with
ventilation, a total of 8 controlled outputs with below
10KW Electric Heat with Ventilation, 7 controlled
outputs below 10KW Electric Heat with no ventilation,
7 controlled outputs with no Electric Heat, but with
ventilation, and 6 controlled outputs with no electric
heat and no ventilation. If Dehumidification Model &
Vent, 10 controlled outputs are needed when above
10KW Electric Heat is employed with ventilation.
CAUTION
Do not plug in or unplug blower motor
connectors while the power is on. Failure to do
so may result in motor failure.
Thermostat
Predominant Features
8403-060
(1120-445)
3 Stage Cool; 3 Stage Heat
Programmable/Non-Programmable
Electronic
HP or Conventional
Auto or Manual changeover
8403-067
(CDT-2W40-LCD-RLY)
Carbon Dioxide Sensor with LCD for
Sensor Readings
8403-084
(VT8600U5000B)
2 stage Cool; 2 stage Heat
Programmable/Non-Programmable
Electronic
HP or Conventional, Auto or Manual
changeover with BACnet
CS9B-THO
3 Stage Heat, 3 Stage Cool, Prog/
NonProg, HP or Conv,
Auto or Manual Changeover, Humidity
Sensor w/dehumidification, Motion
Sensor w/Intelligent Learning Control,
BACnet-compatible
CS9B-THOC
3 Stage Heat, 3 Stage Cool, Prog/
NonProg, HP or Conv,
Auto or Manual Changeover, Humidity
Sensor w/dehumidification, CO
2
Sensor, Motion Sensor w/Intelligent
Learning Control, BACnet-compatible
CS9BE-THO
3 Stage Heat, 3 Stage Cool, Prog/
NonProg, HP or Conv,
Auto or Manual Changeover, Humidity
Sensor w/dehumidification, Motion
Sensor, Intelligent Learning Control,
BACnet-compatible, Ethernet-
compatible
CS9BE-THOC
3 Stage Heat, 3 Stage Cool, Prog/
NonProg, HP or Conv,
Auto or Manual Changeover, Humidity
Sensor w/ dehumidification, CO
2
Sensor, Motion Sensor w/Intelligent
Learning Control, BACnet-compatible,
Ethernet-compatible
