7
Fuses smaller than that recommended on the wiring diagrams
could result in unnecessary fuse failure or service calls. The
use of protective devices of larger size than indicated could
result in extensive damage to the equipment. The
manufacturer bears no responsibility for damage caused to
equipment as result of the use of larger than is recommended
size protective devices.
All units have undergone a run test prior to packaging for
shipment. This equipment has been started at minimum rated voltage and
checked for satisfactory operation. Do not attempt to operate this unit if the
voltage is not within the minimum and maximum voltages shown on nameplate.
All exterior wiring must be within approved weatherproof conduit. The unit
must be
permanently grounded
in accordance with local codes, or in absence
of local codes, with N.E.C ANSI/ NFPA NO. 70-1984
or latest edition by using
ground lug in the control box.
Fuses or HACR type circuit breakers may be used where codes permit.
Note: Some single phase units are equipped with a single pole contactor. Caution
must be exercised when servicing as only one leg of the power supply is broken
with the contactor.
To wire the unit, make the following high and low voltage connections.
High Voltage Wiring: (See Figure 6)
Single Phase- Two leads should be connected to terminals L1
& L2 in the electrical control section, using wire sizes specified
in wiring table.
Low Voltage Wiring: (See Figure 6)
a. Air Conditioners- Connect 24V wires from the thermostat to the
corresponding wires in the control box using No. 18AWG as shown in TABLE
2.
b. Heat Pumps- Connect 24V wires from the thermostat to
the corresponding wires in the control box using No.
18AWG as shown in TABLE 3.
Internal Wiring:
A diagram detailing the internal wiring of this unit is located
on the electrical box cover. If any of the original wire supplied
with the appliance must be replaced, the wire gauge and
insulation must be the same as the original wiring.
Transformer is wired for 230 volts on the 208/230 models. See wiring diagram for 208 volt wiring.
1. For branch circuit wiring (main power supply to unit disconnect), the minimum wire size for the length of the run can
be determined from Table 4 using the circuit ampacity found on the unit rating plate. From the unit disconnect to unit,
the smallest wire size allowable in Table 4 may be used
for the ampacity,
as the Disconnect must be in sight of
the unit.
2. Wire size based on 60° C rated wire insulation and 30° C
Ambient Temperature (86° F).
3. For more than 3 conductors in a raceway or cable, see
the N.E.C. for derating the ampacity of each conductor.
OPERATION
Start-Up Procedure and Checklist
Begin with power turned off at all disconnects.
1. Turn thermostat system switch to “Cool,” and fan switch to “Auto” and turn temperature setting as high as it will go.
2. Inspect all registers and set them to the normal open position.
3. Turn on the electrical supply at the disconnect.
LEAD
THERMOSTAT
Red
R (24V)
Green
G (Fan)
Yellow
Y (Cool)
W hite
W 1 (Heat)*
Brown
W 2 (Heat)*
TERMINAL
THERMOSTAT
Red
R (24V)
Green
G (Fan)
Orange
O (Rev. Valve)
W hite
W 1 (Heat, 2nd)*
B rown
W 2 (Heat 3rd)*
Y ellow
Y (Cool)
C (B lue)
C (Common)
TABLE 2
TABLE 3
*Optional field installed heat connections
BRANCH CIRCUIT AMPACITY
15
20
25
30
35
40
45
50
SUPPLY WIRE LENGTH -
FEET
200
6
4
4
4
3
3
2
2
150
8
6
6
4
4
4
3
3
100
10
8
8
6
6
6
4
4
50
14
12
10
10
8
8
6
6
TABLE 4
WARNING
HIGH
VOLTAGE
!
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR INSTALLING
THIS UNIT.
M
ULTIPLE POWER SOURCES MAY BE PRESENT. FAILU
TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY O
DEATH.
RE
R
WARNING
HIGH
VOLTAGE
!
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR INSTALLING
THIS UNIT.
M
ULTIPLE POWER SOURCES MAY BE PRESENT. FAILU
TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY O
DEATH.
RE
R
