York R-410A User Manual download pdf (Page 12)

528194-YTG-F-1210

12 Johnson Controls Unitary Products

GAS HEATING SECTION (IF EQUIPPED)

Heat exchanger and exhaust system shall be constructed of

aluminized steel and shall be designed with induced draft com-

bustion with post purge logic, energy saving direct spark igni-

tion, and redundant main gas valve. The heat exchanger shall

be of the tubular type, constructed of T1-40 aluminized steel for

corrosion resistance and allowing minimum mixed air entering

temperature of 40 ºF. Burners shall be of the in-shot type, con-

structed of aluminum-coated steel. All gas piping shall enter the

unit cabinet at a single location, through either the side or bot-

tom, without any field modifications. An integrated control board

shall provide timed control of evaporator fan functioning and

burner ignition. Heating section shall be provided with the fol-

lowing minimum protection:

a. Primary and auxiliary high-temperature limit switches.

b. Induced draft pressure sensor.

c. Flame roll out switch (manual reset).

d. Flame proving controls.

e. All two stage units shall have two independent stages of

capacity (60% 1

stage, 100% 2

stage).

ELECTRIC HEATING SECTION (IF EQUIPPED)

An electric heating section, with nickel chromium elements,

shall be provided in a range of 9 thru 54 KW, offering two states

of capacity all sizes. The heating section shall have a primary

limit control(s) (automatic reset) to prevent the heating element

system from operating at an excessive temperature. The Heat-

ing Section assembly shall slide out of the unit for easy mainte-

nance and service. Units with Electric Heating Sections shall be

wired for a single point power supply with branch circuit fusing

(where required).

UNIT OPERATING CHARACTERISTICS

Unit shall be capable of starting and running at 125 ºF outdoor

temperature, exceeding maximum load criteria of ARI Standard

340/360. The compressor, with standard controls, shall be

capable of operation down to 0 ºF outdoor temperature. Unit

shall be provided with fan time delay to prevent cold air delivery

before heat exchanger warms up. (Gas heat only)

ELECTRICAL REQUIREMENTS - 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.

STANDARD LIMITED WARRANTIES - Compressor – 5 Years,

Heat Exchanger – 10 Years, Elect. Heat Elem. – 5 Years,

Parts – 1 Year

FACTORY INSTALLED 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 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 ºF. 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.

Available with barometric relief or power exhaust.

• 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.

ADDITIONAL FACTORY INSTALLED OPTIONS

• ALTERNATE INDOOR BLOWER MOTOR – For

applications with high restrictions, units are available with

optional indoor blower motors that provide higher static

output and/or higher airflow.

• Variable Air Volume (VAV) – The VAV option using a

varible frequency drive (VFD) shall be available on 6-1/2

through 12-1/2 ton, models for applications requiring a

constant supply-duct static pressure. Unts equipped for

VAV shall be controlled by a duct pressure transducer

with a 0 - 5” WC pressure range. The pressure transducer

shall provide a 0 - 5 VDC output signal to a VAV control

board which, in turn shall provide a 2 - 10 VDC speed

reference signal to the VFD. The VAV control board shall

operate using factory-installed Supply Air, Return Air and

Outside Air Temperature Sensors with a nominal

resistance of 10,000 Ohms. Units equipped with VFD’s

shall have factory-installed manual bypass as an option.

• CONVENIENCE OUTLET (POWERED/NON-POWERED)–

Unit can be provided with an optional 120VAC GFCI outlet

with cover on the corner of the unit housing the compressors.

• ELECTRIC HEAT - Electric Heaters range from 9 kW to

54 kW and are available in all the voltage options of the

base unit.

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York R-410A User Manual Page 12

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