York B1CH180, B1CH240 Optional Electric Heaters, Electric Heat Application Data

511.06-N3Y

Refer to the Typical Field Wiring Figure and to the appropriate unit wiring diagram for control circuit and power wiring information.

OPTIONAL ELECTRIC HEATERS

The factory installed heaters are wired for single point power supply. Power supply need only be brought into the single point terminal block and thermostat wiring to the low voltage terminal strip located in the upper portion of the unit control box.

These ETL and CGA approved heaters are located within the central compartment of the unit with the heater elements extending into the supply air chamber. Refer to the Dimensions and Clearances Figure for access panel location.

TABLE 3 - ELECTRIC HEAT APPLICATION DATA

NOMINAL	VOLTAGE	MINIMUM CFM
HEATER SIZE	3 PHASE,	(UNIT SIZE)
(KW)	60 HZ	15 TON	20 TON
18	208/230,460,575	4500	6000
36	208/230,460,575	4500	6000
54	208/230	5000	6000
	460, 575	4500
72	208/230	5000	6000
	460, 575	4500

Fuses are supplied, where required, by the factory. Some KW sizes require fuses and others do not.Refer to the Electric Heat Application table for minimum CFM limitations and to the Electrical Data table for electrical data.

OPTIONAL ECONOMIZER/MOTORIZED DAMPER RAIN HOOD

The instruction for the optional economizer/motorized damper rain hood can be found in form 44-320-2. Use these instructions when field assembling an economizer rain hood onto a unit. The outdoor and return air dampers, the damper actuator, the damper linkage, the outdoor and return air divider baffles, and

all the control sensors are factory mounted as part of the "Factory installed" economizer option.

ENTHALPY SET POINT ADJUSTMENT

Remove the economizer access panel from the unit to check the following adjustments. Loosen but do not remove the two panel latches.

CAUTION: Extreme care must be exercised in turning both the setpoint and minimum position adjusting screws to prevent twisting them off.

1.The enthalpy set point may now be set by selecting the desired setpoint shown in the Adjusting Enthalpy Setpoint Figure. Adjust as follows:

•For a single enthalpy operation, carefully turn the set point adjusting screw to the “A”, “B”, “C” or “D” setting corresponding to the lettered curve.

•For a dual enthalpy operation, carefully turn the set point adjusting screw fully clockwise past the “D” setting.

2.To check that the damper blades move smoothly without binding, carefully turn the minimum position adjusting screw fully clockwise and then energize and de-energize terminals “R” to “G”. With terminals “R” to “G” energized, turn the minimum position screw counterclockwise until the desired minimum position has been attained.

3.Replace the economizer access panel. Reposition the two latches horizontally and retighten the screws.

POWER EXHAUST/BAROMETRIC RELIEF DAMPER AND RAIN HOOD OPTION

The instructions for the power exhaust/barometric relief damper and rain hood can be found in form 44-320-10. The exhaust fan, all supporting brackets, angles, and the wiring are factory installed as part of the power exhaust option.

All of the components, including the dampers, hardware, and mounting instructions are shipped in a single package external from the unit. The hood must be field assembled and installed.

Power exhaust is not available as a field installed option.

6 Unitary Products Group