York DJ 180 User Manual download pdf (Page 38)

261660-YTG-C-0707

38 Unitary Products Group

OUTDOOR (CONDENSER) FAN ASSEMBLY

The outdoor fans shall be of the direct-driven propeller type,

discharge air vertically, have aluminum blades riveted to cor-

rosion resistant steel spider brackets and shall be dynami-

cally balanced for smooth operation. The 4 outdoor fan

motors shall be totally enclosed with permanently lubricated

bearings, internally protected against overload conditions and

staged independently.

REFRIGERANT COMPONENTS

Compressors:

a. Shall be Scroll compressors internally protected with

internal high-pressure relief and over temperature

protection.

b. Shall have internal spring isolation and sound muf-

fling to minimize vibration and noise, and be exter-

nally isolated on a dedicated, independent

mounting.

Coils:

a. Evaporator and condenser coils shall have alumi-

num plate fins mechanically bonded to seamless

internally enhanced copper tubes with all joints

brazed. Special Phenolic coating shall be available

as a factory option.

b. Evaporator and Condenser coils shall be of the

direct expansion, draw-thru, design.

Refrigerant Circuit and Refrigerant Safety Components shall

include:

a. Balance-port thermostatic expansion valve with

independent circuit feed system.

b. Filter drier/strainer to eliminate any moisture or for-

eign matter.

c. Accessible service gage connections on both suc-

tion and discharge lines to charge, evacuate, and

measure refrigerant pressure during any necessary

servicing or troubleshooting, without losing charge.

d. The refrigeration system shall provide at least 15° F

of sub-cooling at design conditions.

e. All models shall have two independent circuits.

f. Hot gas bypass option shall be factory-installed on

compressor #1 discharge line to provide cooling in

low-load applications. HGBP shall be a standard

feature on VAV models and an optional feature on

CV models.

UNIT CONTROLS

a. Unit shall be complete with self-contained low-volt-

age control circuit protected by a resetable circuit

breaker on the 24-volt transformer side.

b. Unit shall incorporate a lockout circuit which pro-

vides reset capability at the space thermostat or

base unit, should any of the following standard

safety devices trip and shut off compressor.

c. Loss-of-charge/Low-pressure switch.

1. High-pressure switch.

2. Freeze-protection thermostat, evaporator coil. If

any of the above safety devices trip, a LED

(light-emitting diode) indicator shall flash a

diagnostic code that indicates which safety

switch has tripped.

d. Unit shall incorporate "AUTO RESET" compressor

over temperature, over current protection.

e. Unit shall operate with conventional thermostat

designs and have a low voltage terminal strip for

easy hook-up.

f. Unit control board shall have on-board diagnostics

and fault code display.

g. Standard controls shall include anti-short cycle and

low voltage protection, and permit cooling operation

down to 0 °F.

h. Control board shall monitor each refrigerant safety

switch independently.

i. Control board shall retain last 5 fault codes in non

volatile memory, which will not be lost in the event of

a power loss.

GAS HEATING SECTION (DJ***N MODELS)

Shall be designed with induced draft combustion with post

purge logic and energy saving direct spark ignition, redun-

dant main gas valve. Ventor wheel shall be constructed of

stainless steel for corrosion resistance. 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 25° F. Burners shall be of the in-

shot type, constructed of aluminum coated steel and contain

air mixture adjustments. All gas piping shall enter the unit

cabinet at a single location through either the side or curb,

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 motor speed sensor.

c. Flame roll out switch (automatic reset).

d. Flame proving controls. Unit shall have two inde-

pendent stages of capacity.

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York DJ 180 User Manual Page 38

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