Filter
Top Products
size and type. Dirty filters reduce the capacity of the unit and
result in frosted coils or safety shutdown. Minimum filter area
and required sizes are shown in Table 3.
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compound on male pipe threads. Install a condensate drain
linefromthe 19mm(
in.)PVCfemale connectiononthe unitto
spill into an open drain.
NOTE: The condensate drain line MUST be trapped to pro
-
vide proper drainage. See Figure 2.
SERVICE ACCESS
Access to all serviceable components is provided by the
following removable panels:
•
Compressor compartment
•
Heater compartment
•
Blower compartment
•
Main control box
•
Filter compartment
•
Motor Access (on units w/belt-drive option)
Refer to Figure 6 for location of these access panels.
BLOWER SPEED SELECTION
Threeblower motor speedsare availableon the BCH048units.
The speed selection is determined by the airflow and ESP
requirements of the applications. BCH060 units have an
adjustable motor pulley to achieve the above conditions.
BCH048 units are shipped with the black wire (labeled #8)
connected to the high speed tap on the blower motor. If a lower
blower speed is desired, this wire should be moved to the
medium or low speed tap on the motor.
DISCONNECT SWITCH BRACKET FOR UNITS
WITH OPTIONAL BELT-DRIVE BRACKET
A special bracket for mounting a field-supplied disconnect
switch is provided in each BCH060. The bracket is shipped
inside the blower compartment taped to the top of the blower
housing. Install the bracket on the left hand side of the unit as
shown in Figure 6. Several existing screws at the top ofthe unit
and one approximately midway down from the top will be used
for mounting the bracket. Screws should be loosened only -
NOT REMOVED. Mounting holes in the bracket have
elongated keyways allowing easy installation. Re-tighten
screws after bracket is in place to ensure panels will remain
leak tight.
COMPRESSORS
On some units the compressor is mounted on springs which
have been tightened down for shipment only.
After this unit is installed, back out the compressor bolts until
the sleeve clears the top grommet.
CAUTION: Do Not
loosen compressor mounting bolts.
THERMOSTAT
The room thermostat should be located on an inside wall
approximately 1422mm (56 in.) above the floor where it is not
subjected to drafts, sun exposure, or heat from electrical
fixtures or appliances. Follow manufacturer's instructions
enclosed with thermostat for general installation procedure.
Color coded insulated wires (#18 AWG) should be used to
connect thermostat to unit. See Figure 3 for wiring details.
NOTE: On units with economizer, remove jumper “J1" from
terminals 8 and 10 on plug connector J3/P7 on the re
-
layboard inthe unitcontrol box.Refer tothe unitwiring
labels located on the inside of the control box access
panel.
An “Emergency Heat” position is provided with the
thermostat. In the “Emergency Heat” position, the thermostat
allowselectric resistanceheatonly.Thecompressoris locked
out. A pilot light on the thermostat indicates that the switch is
on “EM HT”.
POWER AND CONTROL WIRING
Voltage tolerances which must be maintained at the compressor
terminals during starting and running conditions are indicated on
the unit Rating Plate and Table 1.
The wiring harness furnished with this unit is an integral part of
the unit. Field alteration to comply with electrical codes should
not be required.
A disconnect switch should be field provided for the unit. The
switch must be separate from all other circuits. Refer to Figure
6for installationlocation.Ifany ofthewire suppliedwiththe unit
must be replaced, replacementwire must be of the type shown
on the wiring diagram.
Electrical lines must be sized properly to carry the load. USE
COPPERCONDUCTORSONLY.Eachunit mustbe wiredwith
a separate branch circuit fed directly from the meter panel and
properly protected.
CAUTION: When connecting electrical power and control wir
-
ing to the unit, waterproof type connectors MUST
BE USED so that water or moisture cannot be
drawn into the unit during normal operation. The
above waterproofing conditions also apply when
installing a field-supplied disconnect switch.
Refer to Figure 3 for typical field wiring and to the appropriate
unit wiring diagram for control circuit and power wiring
information. Refer to Tables 8 and 9 for electrical data.
ELECTRIC HEATERS
Supplemental electric heaters may be ordered as a field-
installed accessory. Refer to Form 530.18-N7.1V for
installation instruction. These approved heaters are located
within the central compartment of the unit (see Figure 6 for
access panel) with the heating elements extending into the
supply air chamber.
Fuses are supplied, where required, by the factory. Some kW
sizes require fuses and others do not. Refer to the electric
035-12984-001-A-0204
4 Unitary Products Group
FIG. 2 - RECOMMENDED DRAIN PIPING
76
3"
51
2"