Filter
Top Products
819288-UIM-A-0212
8 Unitary Products Group
SECTION VII: LINE POWER
CONNECTIONS
Power may be brought into the unit through the supply air end of the
unit (top when unit is vertical) or the left side panel. Use the hole appro-
priate to the unit’s orientation in each installation to bring conduit from
the disconnect. The power lead conduit should be terminated at the
electrical control box. To minimize air leakage, seal the wiring entry
point at the outside of the unit. See Figure 3.
Refer to Tables to determine proper wire sizing:
Tables 8 & 9 for cooling only or,
Tables 12 & 13 for single phase or,
Tables 15 & 16 for three phase or,
Table 18 for 460V.
SECTION VIII: BLOWER SPEED
CONNECTIONS
All air handlers contain 3-speed blower motors which are prewired to
the control board.
Adjust blower motor speed to provide airflow within the minimum and
maximum limits approved for evaporator coil, electric heat and outdoor
unit. Speed tap adjustments are made at the motor terminal block, See
Figure 8 or 9. Airflow data is shown in Tables 19 & 20.
Connect motor wires to motor speed tap receptacle for speed desired.
See wiring label for motor wiring details.
FIGURE 7: Line Power Connections
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
SINGLE SOURCE (2.5 - 10 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 15 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
AS SHIPPED FROM FACTORY
SINGLE SOURCE
(2.5 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY
GND.
LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
& BREAKER BAR REMOVED
MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY1
GND.
LUG
POWER
SUPPLY2
POWER
SUPPLY3
TYPICAL WIRING WITHOUT ELECTRIC HEAT
GND. LUG
POWER
SUPPLY
GND.
LUG
POWER WIRING (208/230-1-60)
NOTE: USE ONLY COPPER CONDUCTORS
TERMINAL
BLOCK
TERMINAL
BLOCK
MAYBE1,2,OR3
CIRCUIT BREAKERS
MAYBE1,2,OR3
CIRCUIT BREAKERS
(JUMPER BAR)
CONNECT LEADS WITH WIRE NUTS
(TYPICALALLHEAT KITS)
FIGURE 8: 460V - Line Power Connections
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 15 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
3 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
MULTI-SOURCE - 25 KW
GND. LUG
POWER
SUPPLY1
GND.
LUG
POWER
SUPPLY2
TERMINAL
BLOCK
CONNECT TRANSFORMER LEADS WITH WIRE NUTS
(TYPICALALLHEATKITS)
(2) 3-PHASE
BREAKERS
FIGURE 9: Blower Speed Connections FIGURE 10: 460V - Blower Speed Connections
FACTORY WIREDTO
TRANSFORMER
FACTORY WIREDTO
FAN MOTOR RELAY
TERMINAL ON
CONTROL BOARD
YEL
PUR
PUR
HIGH
MED
LOW
GND.
230 VOLT
BLOWER MOTOR
CAP
BRN
ORG
TAPE END & CAP
WITH WIRE NUT
L1
460 VOLT
BLOWER
MOTOR
L2
HIGH
HIGH
MED
LOW
PUR
BRN
460 VOLT BLOWER MOTOR
ORG
L1
460 VOLT
BLOWER
MOTOR
L2
MEDIUM
HIGH
MED
LOW
PUR
BRN
ORG
460 VOLT
BLOWER
MOTOR
L2
LOW
HIGH
MED
LOW
PUR
BRN
L1