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036-21411-002-A-0204
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 ºF
of liquid sub-cooling at design conditions.
4.
Unit Controls:
a.
Unit shall be complete with self contained low-volt-
age control circuit protected by a resetable circuit
breaker fuse on the 24 volt transformer side.
b.
Unit shall incorporate a lock-out 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:
I. Loss-of-charge/Low-pressure switch.
II. High-pressure switch.
III.Freeze-protection
coil.
If any of the above safety devices trip, an LED (light-emitting
diode) indicator shall illuminate.
c.
Unit shall incorporate AUTO RESET compressor
over temperature, over current protection.
d.
Unit shall operate with conventional thermostat
designs and have a low voltage terminal strip for
easy hook-up.
GAS HEATING SECTION (DEG MODELS)
1.
Shall be designed with induced draft combustion with
post purge logic, energy saving direct spark ignition and
redundant main gas valve. Ventor wheel shall be con-
structed of stainless steel for corrosion resistance.
2.
The heat exchanger shall be of the tubular type, con-
structed of T1-40 aluminized steel for corrosion resis-
tance and allowing minimum mixed air entering
temperature of 25 ºF.
3.
Burners shall be of the in-shot type, constructed of alu-
minum coated steel and contain air mixture adjustments.
4.
All gas piping shall enter the unit cabinet at a single loca-
tion, through either the side or bottom, without any field
modifications.
5.
An integrated control board shall provide timed control of
evaporator fan functioning and burner ignition.
Unitary Products Group
thermostat,
evaporator
6.
Heating section shall be provided with the following mini-
mum protection:
a.
Primary
and
auxiliary
switches.
b.
Induced draft motor speed sensor.
c.
Flame roll out switch (automatic reset).
d.
Flame proving controls.
ELECTRIC HEATING SECTION (DEE MODELS)
1.
An electric heating section, with nickel chromium ele-
ments, shall be provided in a range of 5 through 30 KW,
offering two stages of capacity - 16 KW and above on
208/230 volt heaters and 20 KW and above on 460 and
575 volt heaters.
2.
The heating section shall have a primary limit control(s)
and automatic reset, to prevent the heating element sys-
tem from operating at an excessive temperature.
3.
The Heating Section assembly shall slide out of the unit
for easy maintenance and service.
4.
Units with Electric Heating Sections shall be wired for a
single point power supply with branch circuit fusing
(where required).
UNIT OPERATING CHARACTERISTICS
1.
Unit shall be capable of starting and running at 125 ºF
outdoor temperature, exceeding maximum load criteria
of ARI Standard 210/240.
2.
The compressor, with standard controls, shall be capable
of operation down to 45 ºF outdoor temperature. Acces-
sory low ambient kit shall be available for operation
down to 0 ºF.
3.
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
high-temperature
limit
31
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