User's Manual

1068152-YTG-L-0815
182 Johnson Controls Unitary Products
a. Primary tubes and vestibule plates on low NO
x
units shall be 409 stainless steel. Other components shall
be aluminized steel.
2. Induced draft combustion motor and blower
a. Shall be a direct- drive, single inlet, forward- curved centrifugal type.
b. Shall be made from steel with a corrosion- resistant finish.
c. Shall have permanently lubricated sealed bearings. d. Shall have inherent thermal overload protection.
d. Shall have an automatic reset feature.
23 81 19.13.J. Coils
1. Standard Aluminum Fin/Copper Tube Coils:
a. Standard evaporator and condenser coils shall have aluminum lanced plate fins mechanically bonded to
seamless internally grooved copper tubes with all joints brazed.
b. Evaporator coils shall be leak tested to 150 psig, pressure tested to 450 psig, and qualified to CSA C22.2
No. 236-11 (UL 1995) 4th edition burst test at 1775 psig.
c. Condenser coils shall be leak tested to 150 psig, pressure tested to 650 psig, and qualified to CSA C22.2
No. 236-11 (UL 1995) 4th edition burst test at 1980 psig.
2. Optional EFIN- coated aluminum- fin evaporator and condenser coils:
a. Shall have a durable epoxy- phenolic coating to provide protection in mildly corrosive coastal
environments.
b. Coating shall be applied to the aluminum fin stock prior to the fin stamping process to create an inert barrier
between the aluminum fin and copper tube.
c. Epoxy- phenolic barrier shall minimize galvanic action between dissimilar metals.
23 81 19.13.K. Refrigerant Components
1. Refrigerant circuit shall include the following control, safety, and maintenance features:
a. Thermostatic Expansion Valve (TXV) shall help provide optimum performance across the entire operating
range. Shall contain removable power element to allow change out of power element and bulb without
removing the valve body. (Orifice on 3-5 Ton Units)
b. Refrigerant filter drier - Solid core design.
c. Service gauge connections on suction and discharge lines.
d. Pressure gauge access through a specially designed access port in the top panel of the unit.
2. There shall be gauge line access port in the skin of the rooftop, covered by a black, removable plug.
a. The plug shall be easy to remove and replace.
b. When the plug is removed, the gauge access port shall enable maintenance personnel to route their
pressure gauge lines.
c. This gauge access port shall facilitate correct and accurate condenser pressure readings by enabling the
reading with the compressor access panel on.
d. The plug shall be made of a leak proof, UV- resistant, composite material.
3. Compressors
a. Unit shall use fully hermetic, scroll compressor for each independent refrigeration circuit.
b. Compressor motors shall be cooled by refrigerant gas passing through motor windings.
c. Compressors shall be internally protected from high discharge temperature conditions.
d. Compressors shall be protected from an over- temperature and over- amperage conditions by an internal,
motor overload device.
e. Compressor shall be factory mounted on rubber grommets.
f. Compressor motors shall have internal line break thermal, current overload and high pressure differential
protection.
g. Crankcase heaters shall not be required for normal operating range, unless provided by the factory.