York B2CH180 Fixed Outdoor AIR Intake Damper, Condensate Drain, Compressors, Filters, Thermostat

FIXED OUTDOOR AIR INTAKE DAMPER

This damper assembly is shipped inside the return air compartment. It is completely assembled and ready for installation. A damper baffle inside the hood is adjustable to provide variable amounts of outdoor air intake on units that are not provided with an economizer or motorized damper option. Refer to Figure 3.

Gasketing and mounting screws are provided in a parts bag attached to the hood assembly. Apply gasketing to the three flange surfaces on the hood prior to installing the hood. Extend gasketing approximately 6mm (1/4") beyond the top and bottom of the two side flanges to ensure adequate sealing.

Adjusting the damper to the desired air flow may be done before mounting the hood into position or (after installation) by removing the front hood panel or the screen on the bottom of the hood. Damper baffle in position 1 will allow approximately 10% recirculated air flow, position 2 approximately 15% and, to allow approximately 25%, remove the damper baffle.

On units with bottom return air applications, install the damper assembly over the opening in the side return air access panel. Remove and discard the opening cover and the covering over the hood mounting holes (used for shipping) before installing. Secure with the screws provided.

On units with side air applications, install the damper assembly on the return air ductwork as close to the unit as possible. Cut an opening 406mm (16") high by 457mm (18") wide in the ductwork to accommodate the damper. Using the holes in the hood flanges as a template, drill 3.6mm (9/64") dia. (#26 drill) holes into the ductwork and secure with the screws provided.

CAUTION: If outdoor air intake will not be required on units with bottom return air applications, the damper as- sembly should still be mounted on the side return air access panel, per the instructions above, to en- sure moisture is not drawn into the unit during op- eration. The covering over the mounting holes only need be removed. Do not remove the opening cover.

FIG. 3 - FIXED OUTDOOR AIR DAMPER

035-18895-000-A-0902

CONDENSATE DRAIN

Plumbing must conform to local codes. Use a sealing compound on male pipe threads. Install a condensate drain line from the 25mm (1" NPT) female connection on the unit to spill into an open drain.

An alternate drain connection (25mm [1" NPT] female coupling) is provided inboard on the same centerline as the exterior location.

NOTE: The condensate drain line MUST be trapped to pro- vide proper drainage. See Figure 4.

FIG. 4 - RECOMMENDED DRAIN PIPING

COMPRESSORS

Units are shipped with compressor mountings factory-adjusted and ready for operation.

CAUTION: Do Not loosen compressor mounting bolts.

FILTERS

Each unit is supplied with 51mm (2") filters. Filters must always be installed ahead of the indoor coil and must be kept clean or replaced with same 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.

SERVICE ACCESS

Access to all serviceable components is provided by the following removable panels:

•Compressor compartment

•Electric Heat compartment

•Side Supply & Return Air compartments (two panels)

•Main control box

•Blower compartment (three panels)

•Filter compartment

•Outdoor Air compartment (two panels)

Refer to Figure 7 for location of these access panels.

CAUTION: Make sure that all screws and panel latches are re- placed and properly positioned on the unit to main- tain an air-tight seal.

THERMOSTAT

The room thermostat should be located on an inside wall approximately 1422mm (56") above the floor where it is not subject to drafts, sun exposure or heat from electrical fixtures or appliances. Follow manufacturer's instructions enclosed with thermostat for general installation procedure. Color coded

4 Unitary Products Group