York W)036 THRU 060 Specifications download pdf (Page 33)

542300-YIM-A-1009

Johnson Controls Unitary Products 33

Figure 16: Vent And Combustion Air Hood

Options/Accessories

Electric Heat

Electric heaters are available as factory-installed options or

field-installed accessories. Refer to electric heat instructions for

installation. These heaters mount in the heat compartment with

the heating elements extending into the supply air chamber. All

electric heaters are fused and intended for use with single point

power supply.

Economizer/Motorized Damper and Rain Hood

The instruction for the optional economizer/motorized damper

and rain hood can be found in form 035-07364-000. 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/motorized damper options.

Power Exhaust/barometric Relief Damper and Rain Hood

The instructions for the power exhaust/barometric relief damper

and rain hood can be found in form 530.18-N1.10V.

All of the components, including the dampers, hardware, and

mounting instructions are shipped in a single package external

from the unit and must be field assembled and installed.

Power exhaust is only available as a field installed accessory.

Economizer And Power Exhaust Set Point

Adjustments

Remove the top rear access panel from the unit. Locate the

economizer control module, where the following adjustments

will be made.

Minimum Position Adjustment

• Check that the damper blades move smoothly without

binding; carefully turn the Minimum Position Adjust screw

(found on the damper control module) fully clockwise and

then set the thermostat indoor fan switch to the ON

position and then OFF or energize and de-energize

terminals “R” to “G”.

• With the thermostat set to the indoor fan ON position or

terminals “R” to “G” energized, turn the Minimum Position

Adjusting screw (located on the damper control module)

counterclockwise until the desired minimum damper

position has been attained.

Enthalpy Set Point Adjustment

• The enthalpy set point may now be set by selecting the

desired set point shown in the Enthalpy Set Point

Adjustment Figure 17. Adjust as follows:

• For a single enthalpy operation carefully turn the set point

adjusting screw (found on the damper control module) to

the “A”, “B”, “C” or “D” setting corresponding to the lettered

curve of the Enthalpy Set Point Adjustment Figure 18.

• For a dual enthalpy operation, carefully turn the set point

adjusting screw fully clockwise past the "D" setting.

Power Exhaust Damper Set Point (With Or Without Power

Exhaust)

• With no power exhaust option, adjust the Exhaust Air

Adjustment Screw fully clockwise.

• With power exhaust option, each building pressurization

requirement will be different. The point at which the power

exhaust comes on is determined by the economizer

damper position (Percent Open). The Exhaust Air

Adjustment Screw should be set at the Percent Open of

the economizer damper at which the power exhaust is

needed. It can be set from 0 to 100% damper open.

Indoor Air Quality AQ

Indoor Air Quality (indoor sensor input): Terminal AQ accepts a

+2 to +10 Vdc signal with respect to the (AQ1) terminal. When

the signal is below it's set point, the actuator is allowed to

modulate normally in accordance with the enthalpy and mixed

air sensor inputs. When the AQ signal exceeds it's set point

setting and there is no call for free cooling, the actuator is

proportionately modulated from the 2 to 10 Vdc signal, with 2

Vdc corresponding to full closed and 10 Vdc corresponding to

full open. When there is no call for free cooling, the damper

position is limited by the IAQ Max damper position setting.

When the signal exceeds it's set point (Demand Control

Ventilation Set Point) setting and there is a call for free cooling,

An adhesive backed label is provided over the outside of

the combustion air inlet opening to prevent moisture

from entering the unit, which could cause damage to

electrical components. Allow this closure label to remain

in place until the combustion air hood is to be installed.

Extreme care must be exercised in turning all set point,

maximum and minimum damper positioning adjustment

screws to prevent twisting them off.

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York W)036 THRU 060 Specifications Page 33

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