251934-YTG-G-0708
Johnson Controls Unitary Products
9
can also be slab-mounted at ground level or set on steel beams
above a finished roof. Cooling only, cooling with gas heat and
cooling with electric heat models are available with a wide
variety of factory-mounted options and field-installed
accessories to make them suitable for almost every application.
All units are self-contained and assembled on full perimeter
base rails with holes in the four corners for overhead rigging.
Every unit is completely piped, wired, charged and tested at the
factory to simplify the field installation and to provide years of
dependable operation. All models (including those with an
economizer) are suitable for either bottom or horizontal duct
connections. Models with power exhaust are suitable for bottom
duct connections only. For bottom duct, remove the sheet metal
panels from the supply and return air openings through the
base of the unit. For horizontal duct, replace the supply and
return air panels on the rear of the unit with a side duct flange
accessory. All supply air blowers are equipped with a belt drive
that can be adjusted to meet the exact requirements of the job.
Each unit shall have 4 condenser fan motors. A high static drive
option is available for applications with a higher CFM and/or
static pressure requirement. All compressors include crankcase
heat and internal pressure relief. Every refrigerant circuit
includes an expansion valve, a liquid line filter-drier, a discharge
line high pressure switch and a suction line with a freezestat
and low pressure/loss of charge switch. The unit control circuit
includes a 75 VA transformer, a 24-volt circuit breaker and a
relay board with two compressor lockout circuits, a terminal
strip for thermostat wiring, plus an additional set of pin
connectors to simplify the interface of additional field controls.
All units have long lasting powder paint cabinets with 1000 hour
salt spray test approval under ASTM-B117 procedures. All 208/
230, 460 and 575-volt models are CSA approved. All models
include a 1-year limited warranty on the complete unit.
Compressors and electric heater elements carry an additional
4-year warranty. Aluminized steel tubular heat exchangers
carry an additional 9-year warranty.
Description
ZJ units shall be factory-assembled, single packaged, ZJ***N
Electric Cooling/Gas Heat, ZJ***C/E Electric Cooling/Optional
Electric Heat, designed for outdoor mounted installation. The 15
ton unit shall have a minimum EER rating of 12.4. The 17.5 ton
unit shall have a minimum EER rating of 12.1. The 20 ton unit
shall have a minimum EER rating of 11.6. The 25 ton unit shall
have a minimum EER rating of 10.4.
ZR units shall be factory-assembled, single packaged, ZR***N
Electric Cooling/Gas Heat, ZR***C/E Electric Cooling/Optional
Electric Heat, designed for outdoor mounted installation. The 15
ton unit shall have a minimum EER rating of 11.6. The 20 ton
unit shall have a minimum EER rating of 12.1. The 25 ton unit
shall have a minimum EER rating of 10.5.
ZF units shall be factory-assembled, single packaged, ZF***N
Electric Cooling/Gas Heat, ZF***C/E Electric Cooling/Optional
Electric Heat, designed for outdoor mounted installation. The 15
and 17.5 ton units shall have a minimum EER rating of 11.0.
The 20 and 25 ton units shall have a minimum EER rating of 10.
They shall have built-in field convertible duct connections for
down discharge supply/return or horizontal discharge supply/
return, and be available with factory installed options or field
installed accessories. The units shall be factory wired, piped,
charged with R-410A refrigerant and factory tested prior to
shipment. All unit wiring shall be both numbered and color
coded. All units shall be manufactured in a facility certified to
ISO 9001 standards and the cooling performance shall be rated
in accordance with DOE and ARI test procedures. Units shall
be CSA listed, classified to ANSIZ21.47 standards, UL 1995/
CAN/CSA No. 236-M90 conditions.
Unit Cabinet
Unit cabinet shall be constructed of G90 galvanized steel,
with exterior surfaces coated with a non-chalking, powdered
paint finish, certified at 1000 hours salt spray test per ASTM-
B117 standards. Indoor blower section shall be insulated
with a minimum 1/2" thick insulation, coated on the airside.
Aluminum foil faced insulation shall be used in the furnace
compartment and be fastened with ridged fasteners to
prevent insulation from entering the air stream. Cabinet
panels shall be "large" size, easily removable for servicing
and maintenance. Full perimeter base rails shall be provided
to assure reliable transit of equipment, overhead rigging and
proper sealing on roof curb applications. Disposable 2" filters
shall be furnished and be accessible through a removable
access door, sealed airtight. Units filter track shall be
designed to accommodate either 1" or 2" filters. Fan
performance measuring ports shall be provided on the
outside of the cabinet to allow accurate air measurements of
evaporator fan performance without removing panels or
creating air by-pass of the coils. Condensate pan shall be
internally sloped and conform to ASHRAE 62-89 self-
draining standards. Condensate connection shall be a
minimum of 1" I.D. female and be a ridged mount connection.
Unit shall incorporate a fixed outdoor air damper with an
outdoor air intake opening covered with a bird screen and a
rain hood painted to match the exterior of the unit.
Indoor (Evaporator) Fan Assembly
Fan shall be a belt drive assembly and include an adjustable-
pitch motor pulley. Job site selected (B.H.P.) brake horsepower
shall not exceed the motors nameplate horsepower rating, plus
the service factor. Units shall be designed not to operate above
service factor. Fan wheel shall be double-inlet type with
forward-curved blades, dynamically balanced to operate
smoothly throughout the entire range of operation. Airflow
design shall be constant air volume.
A variable air volume (VAV) option using a variable frequency
drive (VFD) is available for applications requiring a constant
supply duct static pressure. Units equipped for VAV shall be
controlled by a duct pressure transducer with a 0 - 5” WC
pressure range. The pressure transducer shall provide a 0 - 5
VDC output signal to a VAV control board which, in turn shall
provide a 2 - 10 VDC speed reference signal to the VFD. The
VAV control board shall operate using factory-installed Supply
Air, Return Air and Outside Air Temperature Sensors. Units
