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 line from the 19mm (3
4in.) PVC female connection on the unit to
76
3"
51
2"
FIG. 2 - RECOMMENDED DRAIN PIPING
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
Refer to Figure 6 for location of these access panels.
BLOWER SPEED SELECTION
Three blower motor speeds are available on the BCH048 units. 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
A special bracket for mounting a
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- lay board in the unit control box. Refer to the unit wiring 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 allows electric resistance heat only. The compressor is 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 6 for installation location. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wiring diagram.
Electrical lines must be sized properly to carry the load. USE COPPER CONDUCTORS ONLY. Each unit must be wired with 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
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
Fuses are supplied, where required, by the factory. Some kW sizes require fuses and others do not. Refer to the electric
4 | Unitary Products Group |
