York R-410A ZH/ZJ/ZR Series Manuel D’Utilisation

528150-YTG-G-1210

Johnson Controls Unitary Products

9

• Slab Economizer for Energy Recovery Ventilator- 

(Without barometric relief or Fresh Air Hood) - The 
economizer is provided with a single enthalpy input. The 
economizer is 2% low leakage type. The economizer has 
spring return, fully modulating damper actuators and is 
capable of introducing up to 100% outdoor air. As the 
outdoor air intake dampers open, the return air dampers 
close. The changeover from mechanical refrigeration to 
economizer operation is regulated by the standard single 
enthalpy input. There is an optional input dual dry bulb 
available. To meet regulated air standards, the economizer 
control accepts an optional CO

2

 

input for

 

demand 

ventilation.With single enthalpy input, the economizer control 
monitors outdoor air. The dual enthalpy kit provides a 
second input used to monitor the return air. With a dual input 
kit installed, the economizer control compares the values of 
the two enthalpy or temperature inputs and positions the 
dampers to provide the maximum efficiency possible.

• Dual Enthalpy Control, Accessory - This kit contains 

the required components to convert a single enthalpy 
economizer to dual enthalpy.

• Barometric Relief Damper - Zero to 100% capacity 

barometric relief dampers for use with horizontal flow, or 
field installed slab economizers.

• Power Exhaust - This accessory installs in the unit with a 

down flow economizer. Power exhaust plugs into the 
connector in the unit bulkhead. You must purchase 
1EH0408 barometric relief when applying to a 
horizontal flow application.

• Manual Outdoor Air Damper - Like the motorized outdoor 

air damper, each manual outdoor air damper includes a 
slide-in damper assembly with an outdoor air hood and 
filters. Customers have a choice of dampers with ranges of 
0% to 100% or 0% to 35% outdoor air entry.

• Motorized Outdoor Air Damper - The motorized outdoor 

air damper includes a slide-in/plug-in damper assembly with 
an outdoor air hood and filters. The outdoor air dampers 
open to the preset position when the indoor fan motor is 
energized. The damper has a range of 0% to 100% outdoor 
air entry. Factory installed option or field installed accessory.

• Smoke Detectors - The smoke detectors stop operation 

of the unit by interrupting power to the control board if 
smoke is detected within the air compartment.

• CO

2

- Senses CO

2

 levels and automatically 

overrides the economizer when levels rise above the 
preset limits.

• Dirty Filter Switch - This kit includes a differential 

pressure switch that energizes the fault light on the unit 
thermostat, indicating that there is an abnormally high 
pressure drop across the filters.

• Coil Guard - Field installed decorative wire coil guard.

• Hail Guard - This kit includes a sloped hood which installs 

over the outside condenser coil and prevents damage to 
the coil fins from hail strikes. Field installed accessory only.

• Flue Exhaust Extension Kit - In locations with wind or 

weather conditions which may interfere with proper 
exhausting of furnace combustion products, this kit can be 
installed to prevent the flue exhaust from entering nearby 
fresh air intakes.

• -60°F Gas Heat Kit - For installations which require gas 

heat units to perform in low ambient temperatures, a gas 
section heating kit is available. This kit provides electric 
heat in the gas heat controls section to ensure the gas 
valve and controls will continue to function properly at 
extremely low temperatures.

• Gas Heat High Altitude Kit - This kit converts a gas heat 

unit to operate at high altitudes, 2,000 to 6,000 feet. 
Conversion kits are available for natural gas and propane.

• Gas Heat Propane Conversion Kit - This kit converts a 

gas-fired heater from natural gas to propane. It contains the 
main burner orifices and gas valve replacement springs.

• Gas Piping Kit - Contains pipe nipples, fittings and gas cock 

required for gas supply connection with external shut off.

• Electric Heaters - The electric heaters range from 3kW to 

54kW and are available in all the voltage options of the 
base units. The 54kW/208-240 volt, field-installed heater 
kit is not available with VAV units due to a lack of space to 
accommodate the heater’s fuse block accessory.

All heaters are dual staged. Cooling units include an 
adapter panel for easy installation of the electric heaters. 
Necessary hardware and connectors are included with the 
heaters. All heaters are intended for single point power 
supply.

• Compressor Lockout (CLO): To prevent mechanical 

(compressorized) operation of the unit during cold 
outdoor conditions where there is a risk of returning 
liquid refrigerant back to the compressors.

• Low Limit Control (LLC): To prevent the supply air 

from dropping below a specified setpoint by utilizing the 
units first stage heating means when there is a demand 
for cooling during cold outside conditions.

• Metal Frame Filter Kit - Metal frame with polyester filter 

medium.

• Permanent Filters - Permanent filters are available.

• Roof Curbs - The roof curbs have insulated decks and are 

shipped disassembled The roof curbs are available in 8” and 
14” heights. For applications with security concerns, burglar 
bars are available for the duct openings of the roof curbs.

• Roof Curb Transition - Single Piece Adapter (10” High) - 

Roof curbs for transitioning from Sunline™ units to 
Predator

®

 units. Fits 7.5 to 12.5 Sunline™

 

roof curbs only.

• Burglar Bars - Mount in the supply and return openings 

to prevent entry into the duct work.

• Thermostat - The units are designed to operate with 24- 

volt electronic and electro-mechanical thermostats. All 6.5 
thru 12.5 ton ZH,ZJ units and all 3 thru 12.5 ton ZR units 
(with or without an economizer) operate with two-stage 
heat/two-stage cool or two-stage cooling only 
thermostats, depending upon unit configuration.