8
CAUTION
T
O AVOID PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE, USE
ONLY COPPER CONDUCTORS.
CAUTION
T
O PREVENT IMPROPER AND DANGEROUS OPERATION DUE TO WIRING ERRORS,
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS.
V
ERIFY PROPER OPERATION AFTER SERVICING.
NOTE:
A weather-tight disconnect switch, properly sized for the
unit total load, must be field or factory installed. An external field
supplied disconnect may be mounted on the exterior panel.
Ensure the data plate is not covered by the field-supplied
disconnect switch.
• Some disconnect switches are not fused. Protect the
power leads at the point of distribution in accordance with
the unit data plate.
• The unit must be electrically grounded in accordance with
local codes or, in the absence of local codes, with the latest
edition of the National Electrical Code (ANSI-NFPA 70). A
ground lug is provided for this purpose. Size grounding
conductor in accordance with Table 250-95 of the National
Electrical Code. Do not use the ground lug for connecting
a neutral conductor.
• Connect power wiring to the compressor contactor closest
to the entrance located within the main control box or to
electrical power block, if equipped.
LOW VOLTAGE
BLOCK
MAIN POWER
LOW VOLTAGE
ENTRANCE
POWER THRU
THE CURB
Power and Low Voltage Block Connections
F
AILURE
OF
UNIT
DUE
TO
OPERATION
ON
IMPROPER
LINE
VOLTAGE
OR
WITH
EXCESSIVE
PHASE
UNBALANCE
CONSTITUTES
PRODUCT
ABUSE
IS
NOT
COVERED
BY
THE
WARRANTY
AND
MAY
CAUSE
SEVERE
DAMAGE
TO
THE
UNIT
ELECTRICAL
COMPONENTS
.
WARNING
Areas Without Convenience Outlet
It is recommended that an independent 115V power source be
brought to the vicinity of the roof top unit for portable lights and
tools used by the service mechanic.
NOTE:
Refer to local codes for requirements. These outlets can
also be factory installed.
U
NITS
INSTALLED
ON
R
OOF
T
OPS
Main power and low voltage wiring may enter the unit through
the condenser end of unit or through the roof curb. Install conduit
connectors at the desired entrance locations. External connec-
tors must be weatherproof. All holes in the unit base must be
sealed (including those around conduit nuts) to prevent water leak-
age into building. All required conduit and fittings are to be field
supplied.
Supply voltage to roof top unit must not vary by more than 10% of
the value indicated on the unit data plate. Phase voltage unbal-
ance must not exceed 2%. Contact your local power company for
correction of improper voltage or phase unbalance.
HIGH VOLTAGE ENTRANCE
LOW VOLTAGE ENTRANCE
1:4
30 1/4”*
12 3/8”
(REMOVE PLUG)
* (6 Ton - 34 1/4”)
4 1/2”
47 1/2”
7 1/2”
POWER THRU
THE CURB
3.5 DIA.
Electrical Entrance and Thru Curb
Unit is equipped with a Low Voltage Terminal Block and has Single
Point wiring to the contactor or power block, if equipped.
L
OW
V
OLTAGE
C
ONTROL
W
IRING
1. A 24V thermostat must be installed for unit operation. It
may be purchased with the unit or field -supplied.
Thermostats may be programmable or electromechanical
as required.
2. Locate thermostat or remote sensor in the conditioned
space where it will sense average temperature. Do not
locate the device where it may be directly exposed to
supply air, sunlight or other sources of heat. Follow
installation instructions packaged with the thermostat.