Subject to change without notice. Printed in U.S.A.
246695-YTG-C-0708
Copyright
©
2008 by Johnson Controls, Inc. All rights reserved.
Supersedes: 246695-YTG-B-0606
Johnson Controls Unitary Products
5005 York Drive
Norman, OK 73069
space during normal operation. During economizer oper-
ation, 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 operation
shall be provided by an integral electronic enthalpy con-
trol 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. Available with barometric relief or power
exhaust.
2.
MOTORIZED OUTDOOR AIR DAMPERS
– Outdoor
and return air dampers that are interlocked and posi-
tioned by a 2-position, 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 ventila-
tion requirements of the conditioned space during normal
operation. Whenever the indoor fan motor is energized,
the dampers open up to one of two pre-selected posi-
tions – regardless of the outdoor air enthalpy. Dampers
return to the fully closed position when the indoor fan
motor is de-energized. Dampers shall fully close on
power loss.
ADDITIONAL FACTORY INSTALLED OPTIONS
•
ALTERNATE INDOOR BLOWER MOTOR
– For appli-
cations with high restrictions, units are available with
optional indoor blower motors that provide higher static
output and/or higher airflow.
•
CONVENIENCE OUTLET (POWERED/NON-POW-
ERED)
– Unit can be provided with an optional 120VAC
GFCI outlet with cover on the corner of the unit housing
the compressors.
•
PHASE MONITOR
- Designed to prevent damage in out-
of-phase condition.
•
COIL GUARD
- Designed to prevent condenser coil
damage.
•
BAS CONTROLS
- Include supply air sensor, return air
sensor, dirty filter indicator and air proving switch.
•
DIRTY FILTER SWITCH
– This kit includes a differential
pressure switch that energizes the fault light on the unit
thermostat, indicating that there is an abnormally high-
pressure drop across the filters.
•
BREAKER
– An HACR breaker can be factory installed
on the gas heat units or cooling units with electric heater.
•
DISCONNECT SWITCH
- A disconnect can be factory
installed on cooling only units, sized for the largest elec-
tric heat available.
•
ELECTRIC HEAT
- The electric heaters range from 18
kW to 54 kW and are available in all the voltage options
of the base units.
•
STAINLESS STEEL HEAT EXCHANGER
– For applica-
tions in a corrosive environment, this option provides a
full stainless steel heat exchanger assembly.
•
STAINLESS STEEL DRAIN PAN -
Provides years of
trouble free operation in corrosive environments.
•
SMOKE DETECTOR
– A smoke detector can be factory
mounted and wired in the supply and/or return air com-
partments.
OTHER PRE-ENGINEERED ACCESSORIES AVAIL-
ABLE
•
ROOF CURB
- 14” and 8” high, full perimeter knockdown
curb, with hinged design for quick assembly.
•
BAROMETRIC RELIEF DAMPER
– (Unit mounted –
Downflow, Duct Mounted – Sideflow) – Contains a rain
hood, air inlet screen, exhaust damper and mounting
hardware. Used to relieve internal air pressure through
the unit during economizer operation.
•
PROPANE CONVERSION KIT
– Contains new orifices
and gas valve springs to convert from natural to L.P. gas.
•
–60
°
F GAS HEAT KIT
– Provides an electric heat kit for
the gas compartment for use in extreme low ambient
conditions.
•
ECONOMIZER
(Downflow and Sideflow)
•
POWER EXHAUST
– (Unit mount – Downflow, Duct
mount – Sideflow)
•
DUAL ENTHALPY KIT
- Provides a second input to
economizer to monitor return air.
