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GAS HEATING SECTION
(DCG Models)
1. Shall be designed with induced draft combustion with post
purge logic, energy saving direct spark ignition and redun-
dant main gas valve. Ventor wheel shall be constructed 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 resistance
and allowing minimum mixed air entering temperature of
25° F.
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 location,
through either the side or bottom, without any field modifi-
cations.
5. An integrated control board shall provide timed control of
evaporator fan functioning and burner ignition.
6. Heating section shall be provided with the following mini-
mum 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.
ELECTRIC HEATING SECTION
(DCE Models)
1. An electric heating section, with nickel chromium elements,
shall be provided in a range of 5 thru 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 system
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 CHARACTERISTIC
S
1. Unit shall be capable of starting and running at 125° F
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° F outdoor temperature. Accessory
low ambient kit shall be available for operation to 0° F.
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
OPTIONAL OUTDOOR AIR
(Shall be made available by either/or):
1. ELECTRONIC ENTHALPY AUTOMATIC ECONOMIZER -
Outdoor and return air dampers that are interlocked and
positioned by a fully-modulating, spring-return damper ac-
tuator. 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 CFM of outdoor air to meet the minimum ventilation
requirement of the conditioned space during normal opera-
tion. During economizer operation, a mixed-air temperature
control shall modulate the outdoor and return air damper
assembly to prevent the supply air temperature from drop-
ping below 55°F. Changeover from compressor to econo-
mizer 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.
2. DUAL INPUT DIFFERENTIAL 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 the design CFM of
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°F. Changeover from compressor to economizer opera-
tion shall be provided by two integral electronic enthalpy
controls - one that senses outdoor air and one that senses
indoor air. Both enthalpy sensors supply input to the logic
module which modulates both sets of dampers for maxi-
mum economizer savings. The outdoor intake opening shall
be covered with a rain hood that matches the exterior of the
unit. Water eliminator/filters shall be provided. Simultane-
ous economizer/compressor operation is also possible.
Dampers shall fully close on power loss.
OTHER PRE-ENGINEERED ACCESSORIES AVAILABLE
1. ROOF CURB - 14” AND 8” high, full perimeter knockdown
curb with hinged design for quick assembly.
2. MANUAL OUTDOOR DAMPER - provides 0% through
35% or 0% through 100% outdoor air capability (field
adjustable). Designed for duct mounted side supply/return
applications. Includes a hood and a screen assembly.
3. OUTDOOR COIL GUARD - Prevents coil damage.
4.
BAROMETRIC RELIEF DAMPER - Contains a rain hood,
air inlet screen, exhaust damper and mounting hardware.
Used to relieve internal air pressure through the unit during
economizer operation.
5. PROPANE CONVERSION KIT - Contains new orifices and
gas valve regulator to convert from natural to L.P. gas.
6. LOW NOX - Required to reduce the emission of nitrogen
oxides below 40 nano grams per joule.
530.18-TG1Y
22 Unitary Products Group