035-12984-001-A-0204

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 (34in.) 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 w/belt-drive option)

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 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 of the 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- 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 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

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Unitary Products Group

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York B3CH 048 and 060 Condensate Drain, Service Access, Blower Speed Selection, Compressors, Thermostat, Electric Heaters

B3CH 048 and 060 specifications

The York B3CH 048 and 060 are part of the advanced line of commercial rooftop units by York, known for their reliability and energy efficiency. Specifically designed for medium to large commercial applications, these units are engineered to provide optimal performance while minimizing operational costs.

One of the key features of the York B3CH series is its adaptable cooling capacity. The B3CH 048 has a cooling capacity of 48,000 BTU/h, while the B3CH 060 offers a slightly higher capacity of 60,000 BTU/h. This flexibility allows businesses to select the unit that best meets their specific cooling requirements, ensuring comfort and efficiency in any environment.

Both models utilize a highly efficient scroll compressor, which is known for its durability and quiet operation. The scroll compressor design allows for superior performance in varying load conditions, contributing to better energy efficiency. In addition, the units feature a multi-speed motor design that adjusts airflow based on demand, further enhancing performance and reducing energy consumption.

York has incorporated advanced technologies into the B3CH series to ensure reliability and ease of maintenance. These units come equipped with a smart control system that enhances user interface through advanced diagnostics and monitoring capabilities. The control system enables users to program temperature settings efficiently and oversees system operation to prevent potential issues. The built-in diagnostic features help facilitate quicker troubleshooting, minimizing downtime.

The units are designed with a robust and weather-resistant cabinet, ensuring durability in various environmental conditions. The galvanized steel construction aids in corrosion resistance, leading to a longer lifespan for the units. Additionally, both models are equipped with high-efficiency air filters that not only improve indoor air quality but also extend the life of the system by minimizing dust accumulation.

Energy efficiency is a significant consideration in today's commercial environments, and the York B3CH series excels in this aspect. With competitive SEER and EER ratings, these units not only comply with but often exceed industry standards, resulting in lower energy bills and reduced carbon footprints.

In summary, the York B3CH 048 and 060 are cutting-edge rooftop units that combine performance, reliability, and energy efficiency. They are ideal for businesses seeking effective solutions for climate control while maintaining operational and energy costs at a minimum.