SMACNA construction standard on fibrous glass ducts. Both
acoustical lining and fibrous ductwork shall comply with National
Fire Protection Association Standards 90A or B as tested by UL
Standard 181 for Class 1 air ducts.
Step 4—Electrical Connections
LINE-VOLTAGE CONNECTIONS
Units with 15- and 20-kw heaters are factory wired for dual-circuit
operation. When single-circuit operation is required, 24- and
30-kw heaters are field convertible, and 15- and 20-kw fused
heaters require the use of factory-authorized adapter kit.
Check all factory wiring per unit wiring diagram and inspect
factory wiring connections to be sure none were loosened in transit
or installation.
Before installing or servicing system, always turn off all
power to system. There may be more than 1 disconnect
switch. Turn off accessory heater power if applicable. Elec-
trical shock can cause personal injury or death.
If a disconnect switch is to be mounted on the unit, select a
location where drill or fastener will not contact electrical or
refrigerant components. Electrical shock can cause personal
injury or death.
NOTE: Before proceeding with electrical connections, make
certain that supply voltage, frequency, and phase are as specified
on unit rating plate. Be sure that electrical service provided by the
utility is sufficient to handle the additional load imposed by this
equipment.
See unit wiring label for proper field high- and low-voltage wiring.
Make all electrical connections in accordance with NEC and any
local codes or ordinances that may apply. Use copper wire only.
The unit must have a separate branch electric circuit with a
field-supplied disconnect switch located within sight from, and
readily accessible from the unit.
All units are shipped with power plug and stripped leads for
connection of field wiring to units without electric heat.
1. Connect 208/230v power leads from field disconnect to
yellow and black stripped leads.
2. Connect ground wire to unit ground lug.
3. If unit contains accessory electric heater, remove and discard
power plug from fan coil and connect male plug from heater
to female plug from unit wiring harness. (See Electric Heater
Installation Instructions.)
24-V CONTROL SYSTEM CONNECTIONS TO UNIT
PRINTED-CIRCUIT BOARD (PCB)
Refer to unit wiring instructions for recommended wiring proce-
dures. Use No. 18 AWG color-coded, insulated (35°C minimum)
wires to make low-voltage connections between thermostat and
unit. If thermostat is located more than 100 ft from unit (as
measured along the low-voltage wires), use No. 16 AWG color-
coded, insulated (35°C minimum) wires. PCB is circuited for
single-stage heater operation. When additional heater staging is
desired using 2-stage or outdoor thermostats, see applicable
outdoor unit instructions. Remove Jumper J2 on PCB to enable
staging.
1. The 5-, 8-, and 10-kw heaters are single stage only.
2. The 15- and 20-kw heaters are adaptable for 2-stage operation.
3. The 24- and 30-kw heaters are adaptable for up to 3-stage
operation.
Connect low-voltage leads to thermostat and outdoor unit. (See
Fig. 9, 10, 11, and 12.)
INTELLIGENT HEAT OPTION
Intelligent Heat staging is an element of the Comfort Heat Pump
System. It requires the use of any one the following electric heat
packages:
Fig. 8—A-Coil in Horizontal Right-Application
A95286
COIL
SUPPORT
RAIL
COIL
BRACKET
DRAIN PAN
SUPPORT
BRACKET
COIL
SUPPORT
RAIL
COIL
BRACKET
HORIZONTAL
DRAIN PAN
PRIMARY DRAIN
HORIZONTAL RIGHT
SECONDARY DRAIN
HORIZONTAL RIGHT
REFRIGERANT
CONNECTIONS
AIR SEAL
ASSEMBLY
A
B
C
A
B
C
FACTORY SHIPPED
HORIZONTAL LEFT
APPLICATION
HORIZONTAL
RIGHT
APPLICATION
PRIMARY DRAIN
HORIZONTAL LEFT
SECONDARY DRAIN
HORIZONTAL LEFT
7
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