Manual 2100-408C
Page
15
FIGURE 10
4 – 8KW 1 Ph — 6KW 3 Ph
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 is the
fan input
.
“Y”
terminal is the
compressor input
.
“B”
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 by
the electronic heat pump control. This is a 24 VAC
output.
“W2”
terminal is
second stage heat
(if equipped).
"O1"
terminal is the
ventilation input
. This terminal
energizes any factory installed ventilation option.
“E”
terminal is the
emergency heat input.
This terminal
energizes the emergency heat relay.
"W3"
terminal is the
dehumidification input
. This
terminal energizes compressor, blower and three-way
valve.
NOTE: For total and proper control using DDC, a total
of 7 controlled outputs are required (6 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.
LOW VOLTAGE CONNECTIONS
FOR
DDC CONTROL
Fan Only
Energize G
Cooling Mode
Energize Y, G
Heat Pump Heating
Energize Y, G, B
2nd Stg Heating
Energize G, W2, Y, B
w/Heat Pump (if employed)
Ventilation
Energize G, O1
Emergency Heat
Energize B, W2, E, G
Dehumidification
Energize W3
MIS-409
