Page 6
Dwg. No. X730377 P02
After all electrical wiring is complete,
set the thermostat system
switch in the OFF position so that the compressor will not run
and then apply power by closing the system main disconnect
switch. This will activate the compressor sump heat. Do not change
the Thermostat System Switch until power has been applied long
enough to evaporate any liquid R-22 in the compressor. It is
recommended that the sump heater be energized for eight (8) hours
prior to starting.
ELECTRICAL WIRING
TABLE 2
THERMOSTAT WIRE SIZE AND MAXIMUM LENGTH
E
Z
I
S
E
R
I
W
)
t
F
(
H
G
T
N
E
L
M
U
M
I
X
A
M
8
1
5
7
6
1
5
2
1
4
1
0
0
2
THERMOSTAT HEAT ANTICIPATOR
The thermostat heat anticipators should be set to equal the amper-
age draw of the W1 thermostat circuit.
IMPORTANT: Upon completion of wiring check all electrical
connections, including factory wiring within the unit.
Make
sure all connections are tight. Replace and secure all electrical box
covers and access doors before leaving the unit or turning on the
power to the unit.
ELECTRICAL CONNECTIONS
Electrical wiring and grounding must be installed in accordance with
local codes or, in the absence of local codes, with the National
Electrical Code ANSI/NFPA 70, Latest Revision.
ELECTRICAL POWER
It is important that proper electrical power be available for the unit.
Voltage variation should remain within the limits stamped on the unit
nameplate.
DISCONNECT SWITCH
Provide an approved weatherproof disconnect either on the side of
the unit or within close proximity and
within sight of the unit.
OVER CURRENT PROTECTION
The branch circuit feeding the unit must be protected as shown on
the unit rating plate.
POWER WIRING
The power supply lines must be run in weathertight conduit to the
disconnect and into the bottom of the unit control box. Provide strain
relief for all conduit with suitable connectors.
Provide flexible conduit supports whenever vibration transmission
may cause a noise problem within the building structure.
Be sure all connections are made tight. See Figure 4.
NOTES:
For branch circuit wiring (main power supply to unit
disconnect), wire size for the length of run should be determined
using the circuit ampacity found on the unit nameplate and the
N.E.C.
For more than 3 conductors in a raceway or cable, see the
N.E.C. for derating the ampacity of each conductor.
GROUNDING: THE UNIT MUST BE ELECTRICALLY GROUNDED
IN ACCORDANCE WITH LOCAL CODES OR THE NATIONAL
ELECTRIC CODE.
NOTE: Ground the unit internally as provided. See wiring
diagram for location.
CONTROL WIRING (CLASS II)
Low voltage control wiring should not be run in conduit with power
wiring unless Class 1 wire of proper voltage rating is used. Route
the thermostat cable or equivalent single leads of No. 18 AWG
colored wire from the thermostat subbase terminals through the
rubber gromment on the unit. See Figure 2 for the control entry
location. Make connections as shown on the unit wiring diagram
and in Figure 4.
Do not short thermostat wires since this will damage the control
transformer.
Recommended wire sizes and lengths for installing the unit thermo-
stat are provided in Table 2. The total resistance of these low
voltage wires must not exceed one (1) ohm. Any resistance in
excess of 1 ohm may cause the control to malfunction because of
the excessive voltage drop
