7
Electrical Connections
Supply Voltage
USE COPPER CONDUCTORS ONLY.
A single point supply voltage termination is provided in
the airhandler control box (non-heat kit models) or heat kit
control box (heat kit models). This termination is common
to both the airhandler, and if equipped, heat kit. The wire
is to be sized in accordance with the “Electrical Wire and
MOP” section of this manual. Reference wiring diagram
provided with the unit and this manual for supply voltage
connections.
Air Handler Only (Non-Heat Kit Models)
Supply wire is to be routed through conduit from the
service disconnect box to the unit. The airhandler is
equipped with a knockout suitable for ¾” conduit. The
following diagram illustrates the supply voltage hook-up.
Heater Kit Models
When a heater kit is used the system uses a single point
wiring hook-up. The supply wire is to be routed through
conduit from the service disconnect box to the heater kit.
The heat kit is equipped with a knockout suitable for ½” or
¾” conduit dependent on the KW. The supply voltage is to
be installed on the terminal block located in the heater kit
control box.
The heater kit is factory equipped with the supply and low
voltage wires for the airhandler. The low voltage connection
from the heater kit is provided through a multi-pin plug
which connects to a mating plug in the airhandler. The
high voltage connections are to be made at the air handler
contactor. These wires are to be routed through the
pipe nipples supplied with the heater kit as shown in the
illustration:
G
R
D
TR
SE
Q
R
2
BR
1
GND
TERMINATE SUPPLY
VOLTAGE TO THE LINE
SIDE OF THE
CONTACTOR
HIGH VOLTAGE
ENTRANCE
Low Voltage Connections
The 24V-control voltage connects the airhandler to the
room thermostat and condenser. These models are
designed for use with a two-stage thermostat. Low voltage
wiring is to be copper conductors, and be a minimum of
18AWG. A provision on the cabinet side to accept the low
voltage wiring is provided. See the system wiring diagram
for typical low voltage connections.
Heat Kit Installation
Inspect for Shipping Damage. The heat kit is an optional
accessory that is shipped separately from the air handler.
Inspect the heat kit for damage and report any damage to
the carrier and/or distributor. Do not install this accessory
if it is determined that the integrity or safety has been
compromised by freight damage.
Check the Nameplate. From the heat kit nameplate check
the following:
•
The model number agrees with the approved models
(see the “Electric Heat” section of this manual).
•
The correct size (kW)
•
Electric characteristics, voltage and phase, agree with
the building electrical supply.
•
Attaching the Heat Kit: The heat kit attaches directly
to the top panel (when viewed in the upflow position)
GROUND
TERMINATE SUPPLY
VOLTAGE TO THE LINE
SIDE OF THE CONTACTOR
