20
18 Wiring Diagrams
NOTES:
1) OUTDOOR THERMOSTAT (OT-1) SHOULD BE THE
FIRST TO CLOSE AND THE LAST TO OPEN.
2) JUMPER W1 AND W2 TOGETHER IF OT-2 IS NOT USED.
3) REMOVE WIRE WHEN USING OUTDOOR THERMOSTAT.
NOMENCLATURE:
OT - OUTDOOR THERMOSTAT (OPTIONAL)
EHR - EMERGENCY HEAT RELAY (OPTIONAL)
COLOR CODES
RD - RED
YL - YELLOW
BL - BLUE
BR - BROWN
OR - ORANGE
WH - WHITE
COOLING UNIT WITH OPTIONAL HEAT KITS OF 10 kW AND BELOW
G R
C
W1
Y
W
W2
Y2
Y1
O
G
R
TB
YL
BL
TO CONDENSING UNIT
24V CONNECTION
BL
YL
YL
WH
GR
RD
#18 GA. 4 WIRES WITH COOLING
3 WIRES WITHOUT
AIR HANDLER
Y
G
W
W2
R
COOLING UNIT WITH OPTIONAL HEAT KITS OF 15 kW AND ABOVE
AND ROOM THERMOSTAT WITH TWO STAGES OF HEAT
C
W1
W2
Y2
Y1
O
G
R
TB
YL
BL
CONDENSING UNIT
24V CONNECTION
BL
YL
GR
RD
#18 GA. 5 WIRES WITH COOLING
4 WIRES WITHOUT
WH
YL
BR
BR
BR
YL
AIR HANDLER
SEE NOTE #3
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
HIGH VOLTAGE!
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
OR
INSTALLING
THIS
UNIT
.
M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
. F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.