Specifications

8
IF OTHER THAN NON-METALLIC
CABLES ARE USED FOR SUPPLY
CONDUCTORS, APPROPRIATE STRAIN
RELIEF CONNECTORS OR CLAMPS
SHOULD BE USED.
IN NO CASE SHOULD CLAMPING OR
PINCHING ACTION BE APPLIED TO
THE INDIVIDUAL SUPPLY LEADS
(NEUTRAL AND “HOT” WIRES).
3. Connect high voltage supply leads to the control box
wire leads with provided wire nuts. “Hot” connects
to black lead, “neutral” to white lead and “ground”
to green lead.
4. Gently fold all wiring into the electrical box while
verifying that it is not either pinched or cut.
5. Complying with the warnings listed below, connect
the 115 VAC supply wiring to its power source. Be
sure all power remains off until beginning checkout
procedure.
DANGER
TO PREVENT THE POSSIBILITY OF SHOCK INJURY
FROM APPLIANCE OPERATION:
THE WHITE WIRE MUST BE CONNECTED TO
NEUTRAL IN THE SERVICE BOX ENTRANCE AND
THE MECHANICAL GROUND MUST BE
CONNECTED TO A GROUNDING LUG IN THE
SERVICE BOX OR THE MOTOR GENERATOR
COMPARTMENT.
IMPORTANT
When connecting the 115V electrical conduit:
1. Make any adjustments required to relieve
pinched or stressed wiring.
2. Verify that the “ridged” side of both plugs are
properly aligned. Verify that the connectors
have snapped together on both sides. Do not
use excessive force when joining the connectors.
CONNECT THERMOSTAT WIRING
A. Ceiling Plenum Connections
1. Bring the thermostat wiring previously routed into
the roof opening to the low voltage terminal board
extending from the front of the ceiling plenum
electrical box.
These low voltage ceiling plenum designations
complete the following circuits:
B -12 VDC for all relay coils
Y +12 VDC for compressor relay coil
GH +12 VDC for hi fan relay coil
GL +12 VDC for low fan relay coil
W +12 VDC for heat relay – found on
heat ready boxes
CHART 1
Ceiling Plenum
Low Voltage Wire
Designations
Wall Thermostat
Control Wiring
Mate With
B Blue
Y Yellow
GH Green
GL Gray
W White
After completion of high and low voltage wiring,
replace the wirebox cover.
B. Mounting the Wirebox (See Figure 2)
1. Two machine screws are on the upper units. The
control box will be mounted by positioning the
control box over the screws and using the wing
nuts to fasten the control box to the upper unit.
Installation in a 47000 series unit will require
mounting the control box with the wires exiting
upwards (See Figure 4).
2. Insert the freeze circuit thermistor probe into the roof
top unit evaporator coil. Verify that the probe is
located in the coil properly (See Figure 2).
The optional heater assembly may now be installed.
Refer to Figures 2 and 3 for the 48000 and 49000
series units. Refer to Figure 5 for the 47000 series
units.
Position the heater assembly into the return air
opening as shown (for 48000 and 49000 series).
The heater bracket must be installed between the
basepan and the plastic drain pan. See Figure 3.
Tighten set screw to secure the assembly so as to
prevent movement. The 47000 series installation
will use wing nuts to secure the heater as in
Figure 5.
Insert the two-pin connector of the heater
umbilical into the receptacle on the control box.
Insure that the connector snap-locks into position.