York Complete Guide to Efficient Operation of Your Air Conditioner

035-17311-003-A-0704

ECONOMIZER

The Economizer can be a factory installed option or a field installed accessory. If factory installed, refer to the instruc- tions included with the outdoor air hood to complete the assembly. Field installed Economizer accessories include complete instructions for installation.

There are two Economizer options:

1.Down Flow application with barometric relief hood standard.

2.Horizontal Flow application that requires the purchase of a barometric relief hood.

POWER EXHAUST

The Power Exhaust can be a factory installed option or a field installed accessory. If factory installed, refer to the instruc- tions included with the outdoor air hood to complete the assembly. Field installed Power Exhaust accessories include complete instructions for installation.

The Power Exhaust factory installed option is for Down Flow application only.

There are two field installed Power Exhaust accessories:

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 Posi- tion 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 20. Adjust as follows:

•For a single enthalpy operation carefully turn the set point adjusting screw (found on the damper control mod- ule) to the "A", "B", "C" or "D" setting corresponding to the lettered curve of the Enthalpy Set Point Adjustment Figure 20.

•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 WITH- OUT POWER EXHAUST)

1. Down Flow application.		• With no power exhaust option, adjust the Exhaust Air
		Adjustment Screw fully clockwise. This will allow 2nd
2. Horizontal Flow application that requires the purchase of
		stage cooling to operate.
	a barometric relief hood.	• With power exhaust option, each building pressurization
RAIN HOOD
		requirement will be different. The point at which the
All of the hood components, including the filters, the gasket-		power exhaust comes on is determined by the econo-
		mizer damper position (Percent Open). The Exhaust Air
ing and the hardware for assembling, are packaged and		Adjustment Screw should be set at the Percent Open of
located between the condenser coil section and the main unit		the economizer damper at which the power exhaust is
cabinet, if the unit has factory installed options. If field		needed. It can be set from 0 to 100% damper open.
installed accessories are being installed all parts necessary
for the installation comes in the accessory.		INDOOR AIR QUALITY AQ
ECONOMIZER AND POWER EXHAUST SET POINT		Indoor Air Quality (indoor sensor input): Terminal AQ accepts
ADJUSTMENTS AND INFORMATION		a +2 to +10 Vdc signal with respect to the (AQ1) terminal.
Remove the top rear access panel from the unit. Locate the		When the signal is below it's set point, the actuator is allowed
		to modulate normally in accordance with the enthalpy and
economizer control module, where the following adjustments
		mixed air sensor inputs. When the AQ signal exceeds it's set
will be made.
		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.
	Extreme care must be exercised in turning all set	When the signal exceeds it's set point (Demand Control Ven-
	point, maximum and minimum damper positioning	tilation Set Point) setting and there is a call for free cooling,
	adjustment screws to prevent twisting them off.	the actuator modulates from the minimum position to the full
		open position based on the highest call from either the mixed
MINIMUM POSITION ADJUSTMENT		air sensor input or the AQ voltage input.
• Check that the damper blades move smoothly without		• Optional CO2 Space Sensor Kit Part # 2AQ04700324
	binding; carefully turn the Minimum Position Adjust	• Optional CO2 Sensor Kit Part # 2AQ04700424
	screw (found on the damper control module) fully clock-	Replace the top rear access panel on the unit.
	wise and then set the thermostat indoor fan switch to the
22		Unitary Products Group