York WR240 用户手册

262292-YTG-B-0107

Unitary Products Group

55

Unit shall be capable of starting and running at 125° F outdoor 
temperature, exceeding maximum load criteria of ARI Standard 
340/360. The compressor, with standard controls, shall be 
capable of operation down to 25° F outdoor temperature. 
Accessory low ambient kit shall be available for operation to 0° 
F. Unit shall be provided with fan time delay to prevent cold air 
delivery before heat exchanger warms up (Gas heat only). 

All unit power wiring shall enter unit cabinet at a single factory 
provided location and be capable of side or bottom entry, to 
minimize roof penetrations and avoid unit field modifications. 
Separate side and bottom openings shall be provided for the 
control wiring. 

•

Compressor 5 Years

•

Heat Exchanger 10 Years

•

Electric Heat Element 5 Years

•

Other Parts 1 Year

OPTIONAL OUTDOOR AIR (Shall be made available by
either/or): 

• ELECTRONIC ENTHALPY AUTOMATIC ECONOMIZER 

- Outdoor and return air dampers that are interlocked and 
positioned by a fully-modulating, spring-return damper 
actuator. The maximum leakage rate for the outdoor air 
intake dampers shall not exceed 2% when dampers are 
fully closed and operating against a pressure differential 
of 0.5 IWG. A unit-mounted potentiometer shall be 
provided to adjust the outdoor and return air damper 
assembly to take in CFM of outdoor air to meet the 
minimum ventilation requirement of the conditioned space 
during normal operation. During economizer operation, a 
mixed-air temperature control shall modulate the outdoor 
and return air damper assembly to prevent the supply air 
temperature from dropping below 55°F. Changeover from 
compressor to economizer operation shall be provided by 
an integral electronic enthalpy control that feeds input into 
the basic module. The outdoor intake opening shall be 
covered with a rain hood that matches the exterior of the 
unit. Water eliminator/filters shall be provided. 
Simultaneous economizer/compressor operation is also 
possible. Dampers shall fully close on power loss. 

• MOTORIZED OUTDOOR AIR DAMPERS - Outdoor and 

return air dampers that are interlocked and positioned by 
a 2-position, spring-return damper actuator. The 
maximum leakage rate for the outdoor air intake dampers 
shall not exceed 2% when dampers are fully closed and 
operating against a pressure differential of 0.5 IWG. A 
unit-mounted potentiometer shall be provided to adjust 
the outdoor and return air damper assembly to take in the 
design CFM of outdoor air to meet the ventilation 
requirements of the conditioned space during normal 
operation. Whenever the indoor fan motor is energized, 
the dampers open up to one of two pre-selected positions 
- regardless of the outdoor air enthalpy. Dampers return to 

the fully closed position when the indoor fan motor is de-
energized. Dampers shall fully close on power loss. 

• ROOF CURB - 14" high, full perimeter curb with wood 

nailer (shipped knocked-down). 

• 100% BAROMETRIC RELIEF DAMPER - Contains a rain 

hood, air inlet screen, exhaust damper and mounting 
hardware. Used to relieve internal air pressure through 
the unit. 

• PROPANE CONVERSION KIT - Contains new orifices 

and gas valve parts to convert from natural to L.P. gas. 
One per unit required. 

• HIGH ALTITUDE - NATURAL GAS - Contains orifices 

required for applications between 2000 and 6000 feet 
altitude. 

• HIGH ALTITUDE - PROPANE GAS - Contains orifices 

required for applications between 2000 and 6000 feet 
altitude. Must be used with propane conversion kit. 

• BURGLAR BARS - Designed to work with above roof 

curbs, depending on unit model. Fits duct openings of 
curb supply and return air openings. 

• SIDE DUCT FLANGE - Supply and return air duct flanges 

for side duct applications. Do not use on units with power 
exhaust. 

• HIGH SPEED DRIVE - Includes blower pulley and belt for 

higher CFM and/or static pressure requirements.

• WOOD SKID - Allows unit to be handled with 90" forks. 

• ECONOMIZER/MOTORIZED DAMPER RAIN HOOD 

(WRN/E/C30 only) - Contains all hood panels and the 
hardware for assembling. 

• ANTI-RECYCLE TIMER - Assures 5-minute off time 

between compressor cycles.

• LOW AMBIENT KIT - Provides unit cooling operation 

down to 0°F. 

• COIL GUARD KIT - Guard for cooling coil. 

• POWER EXHAUST OPTION - To work in conjunction 

with economizers.

• BAS CONTROLS (Simplicity® INTELLI-Comfort™, CPC, 

JOHNSON, HONEYWELL, NOVAR)