Unit installation

Page 16
Installer’s Guide
Air Filter Installation
The 4WCZ6 heating/cooling unit requires an air filter. A filter frame
accessory is offered that will allow the installation of a filter within
the unit.
Otherwise a filter rack must be installed by the installer in the return
duct work.
Affix the filter label supplied with the unit adjacent to the filter area.
Refer to Table 1 to determine filter size.
Table 1. Determine Filter Size
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's nameplate.
Disconnect Switch
Provide an approved weatherproof disconnect within close prox-
imity and within sight of the unit.
Over Current Protection
The branch circuit feeding the unit must be protected as shown on
the unit's nameplate.
Power Wiring
The power supply lines must be run in weather-tight conduit to the
disconnect and into the side of the unit control box. Provide strain
relief for all conduit with suitable connectors.
Electrical Wiring
To connect power to the unit:
1. Remove the Control access panel. Pass the power
wires through the Power Entry hole in the end of the unit.
See Figure 16 below.
2. Connect the high voltage wires to the appropriate contactor
terminals. Single phase units use a two (2) pole contactor
and three phase units use a three (3) pole contactor. Connect
the ground to the ground lug on the chassis. See Figure 17
below. Be sure all connections are tight.
GROUNDING: THE UNIT MUST BE ELECTRICALLY
GROUNDED IN ACCORDANCE WITH LOCAL CODES OR
THE NATIONAL ELECTRIC CODE.
NOTE: For branch circuit wiring (main power supply to unit
disconnect), determine wire size for the length of run using the
circuit ampacity found on the unit's nameplate and the N.E.C.
For more than three (3) conductors in a raceway or cable, see
the N.E.C. for derating the ampacity of each conductor.
*Filters must be installed in the return air system. The above square
footages are based on 300 F.P.M. face velocity. If permanent filters are
used, size per mfg. Recommendation with clear resistance of 0.05"WC.
Figure 17. Power Connections
Provide flexible conduit supports whenever vibration transmission
may cause a noise problem within the building structure.
For units that are configured for single point entry, refer to the
appropriate Single Power Entry Kit Installer's Guide to connect
power.
For units that are configured with supplemental heat, refer to the
appropriate Supplemental Electric Heater Installer's Guide to
connect heater power.
Figure 16. Power Wiring
Run power supply
lines through
weather-tight conduit
and secure to unit
with strain relief
Power Entry
Power Entry
Single Pointy Entry
(use with Single
Power Entry Kit)
24V Entry
Control
Access Panel
NOTE: This unit is factory wired for 230V. See wiring diagram
for 208V conversion.
Contactor
Unit Ground Lug
UNIT
NOMINAL
CFM
FILTER* SIZE
(Sq. Ft.)
FILTER
RESISTANCE
(
"W.C."
)
4WCZ6036 1200 4 0.08
4WCZ6048 1600 5.33 0.08
4WCZ6060 2000 6.67 0.08