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036-21216-003-A-0204
Unitary Products Group 25
b. Unit shall incorporate a lock-out circuit which pro-
vides reset capability at the space thermostat,
should any of the following standard safety devices
trip and shut off compressor:
I.AUTO RESET - Compressor over temperature, over
current.
II.Loss-of-charge/low-pressure switch.
III.Freeze-protection thermostat, evaporator coil.
IV.High-pressure switch.
The lockout protection shall be easily disconnected at
the control board, if necessary.
Heating Section:
1. Induced draft combustion with Post purge logic and
energy saving direct spark ignition, redundant main gas
valve with venter wheel constructed of stainless steel
material.
2. The heat exchanger shall be of the tubular type con-
structed of a minimum of 18 gage steel coated with a
nominal 1.2 mil aluminum-silicone alloy for corrosion
resistance. Warranty shall be of 10-years.
3. Burners shall be of the in-shot type constructed of alumi-
num coated steel and contain air mixture adjustments.
4. All gas piping shall enter the unit cabinet at a single loca-
tion, and be capable of side or bottom entry without
major unit field modifications.
5. A Integrated control board shall provide timed control of
evaporator fan functioning and burner ignition. An LED
(light-emitting diode) shall provide diagnostic informa-
tion.
6. Heating section shall be provided with the following mini-
mum protection:
a. High-temperature limit switch.
b. Induced draft motor speed sensor.
c. Flame roll out switch (automatic reset).
d. Flame proving controls.
Operating Characteristics:
1. Unit shall be capable of starting and running at 125 F
ambient outdoor temperature, exceeding maximum load
criteria of ARI Standard 210/240.
2. Compressor with standard controls shall be capable of
operation down to 45 F ambient outdoor temperature.
Accessory low ambient kit operated to 0 F.
3. Unit 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 fac-
tory-pre drilled location and be capable of side or bottom
entry without major unit field modifications