York International ZX Series User manual

5943356-UIM-A-1020 York International Corporation, 5005
York Drive, Norman, OK 73069
2020-10-01
Johnson Controls Ducted Systems
INSTALLATION MANUAL ZX SERIES
6-12.5Ton 60 Hertz R-410A

2 INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A
Johnson Controls Ducted Systems

Contents
ContentsGeneral........................................................................... 5
Safety Considerations............................................. 5
Inspection................................................................ 6
Reference................................................................. 6
Renewal Parts.......................................................... 6
Approvals................................................................. 6
Nomenclature.......................................................... 8
Installation..................................................................... 9
Installation Safety Information............................. 9
Preceding Installation............................................. 9
Limitations....................................................... 12
Location.................................................................. 12
Clearances........................................................ 12
Rigging and Handling........................................... 13
ZXA7, 08-14 Unit Weights..................................... 14
Ductwork................................................................ 20
Duct Covers...................................................... 20
Condensate Drain................................................. 21
Compressors.......................................................... 22
Filters...................................................................... 22
Power And Control Wiring................................... 22
Thermostat Wiring.......................................... 23
Typical Field Power and Control Wiring................... 24
Typical Power Wiring............................................ 24
Electrical Data........................................................ 26
ZXA7, 08 to 14 Standard Static Indoor
Blower - With Powered Convenience
Outlet................................................................. 26
ZXA7, 08 to 14 High Static Indoor Blower
- With Powered Convenience Outlet.............. 29
ZXA7, 08 to 14 High Static Indoor Blower
- Without Powered Convenience Outlet........ 32
ZXA7, ZX08 to 14 Medium Static Indoor
Blower - Without Powered Convenience
Outlet................................................................. 35
ZXA7, ZX08 to 14 Medium Static Indoor
Blower - With Powered Convenience
Outlet................................................................. 38
ZXA7, 08 to 14 Standard Static Indoor
Blower - Without Powered Convenience
Outlet................................................................. 41
Physical data ZXA7, 08 to 14................................ 44
Optional Gas Heat................................................. 54
Gas Piping........................................................ 54
Gas Connection............................................... 54
Combustion Air and Flue Exhaust................. 55
Options/Accessories............................................. 56
Economizer...................................................... 56
Power Exhaust................................................. 56
Rain Hood......................................................... 56
Blower Phasing...................................................... 56
Blower Rotation............................................... 57
Belt Tension..................................................... 58
Altitude and Temperature Correction for
CFM, Static Pressure and Power..................... 58
Airflow Performance............................................. 61
ZXA7, 08-14 Side Duct Application (Belt
Drive)................................................................. 62
ZXA7, 08-14 Bottom Duct Application
(Belt Drive)........................................................ 65
RPM selection.................................................. 68
Supply Air Drive Adjustment.......................... 68
Everyday Thermostat Control (ETC).............. 71
Smart Equipment™ unit control board......... 75
Operation..................................................................... 80
Cooling sequence of operation........................... 80
Electric Heating Sequence of Operations.......... 83
Electric Heat Operating Errors....................... 83
Gas Heating Sequence of Operations................ 83
Gas Heat Operation Errors............................. 84
Indoor Air Quality AQ........................................... 86
Gas Heating Operation......................................... 86
Gas Heat Ignition Control Board Function............... 87
Ignition Control Board on Standby..................... 87
Call for heat........................................................... 87
Pressure switch proving....................................... 87
Pre-purge............................................................... 87
Ignition trial period............................................... 87
Flame stabilization period.................................... 87
Main Burner operation......................................... 87
Post Purge.............................................................. 88
Lockout................................................................... 88
High temperature limit switch............................ 88
Roll-out switch....................................................... 88
Power interruptions.............................................. 88
Flame present with Gas off.................................. 88
Welded gas valve relay response........................ 88
Cooling start-up.......................................................... 89
Prestart Check List................................................ 89
Operating instructions......................................... 89
Johnson Controls Ducted Systems
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A 3

Post Start Check List...................................................... 89
Gas heat start-up................................................................. 90
Pre-Start Check List........................................................ 90
Operating instructions.................................................. 90
Lighting The Main Burners........................................... 90
Post Start Checklist........................................................ 90
Shut Down...................................................................... 90
Checking Gas Heat Input.................................................... 91
Two Stage Gas Heat....................................................... 91
Manifold Gas Pressure Adjustment............................. 92
Two Stage.................................................................. 92
Adjustment Of Temperature Rise................................ 93
Burners/Orifices Inspection/Servicing........................ 93
Troubleshooting................................................................... 95
Charging Tables ZXA7, ZX08 to 14................................ 98
Smart Equipment™ Control Board Navigation
Components........................................................................ 103
Start-Up Sheet.................................................................... 104
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A4
Johnson Controls Ducted Systems

General
ZX units are single package air conditioners
with optional gas heating designed for outdoor
installation on a rooftop or slab and for non-
residential use.
These units are completely assembled on rigid,
permanently attached base rails. All piping,
refrigerant charge, and electrical wiring is
factory installed and tested. The units require
electric power, gas supply (where applicable),
and duct connections.
Safety Considerations
This is a safety alert symbol. When you see
this symbol on labels or in manuals, be alert to
the potential for personal injury.
Understand and pay particular attention the
signal words DANGER, WARNING or CAUTION.
DANGER indicates an imminently hazardous
situation, which, if not avoided, will result in
death or serious injury.
WARNING indicates a potentially hazardous
situation, which, if not avoided, could result in
death or serious injury.
CAUTION indicates a potentially hazardous
situation, which, if not avoided may result
in minor or moderate injury. It is also used
to alert against unsafe practices and hazards
involving only property damage.
WARNING
Improper installation may create a condition
where the operation of the product could cause
personal injury or property damage. Improper
installation, adjustment, alteration, service
or maintenance can cause injury or property
damage. Refer to this manual for assistance
or for additional information, consult a qualified
contractor, installer or service agency.
CAUTION
This product must be installed in strict
compliance with the installation instructions and
any applicable local, state and national codes
including, but not limited to building, electrical,
and mechanical codes.
WARNING
Before performing service or maintenance
operations on unit, turn off main power switch
to unit. Electrical shock could cause personal
injury. Improper installation, adjustment,
alteration, service or maintenance can cause
injury or property damage. Refer to this manual.
For assistance or additional information consult
a qualified installer, service agency or the gas
supplier.
CAUTION
This system uses R-410A Refrigerant which
operates at higher pressures than R-22. No
other refrigerant may be used in this system.
Gauge sets, hoses, refrigerant containers
and recovery systems must be designed to
handle R-410A. If you are unsure, consult the
equipment manufacturer. Failure to use R-410A
compatible servicing equipment may result in
property damage or injury.
WARNING
If the information in this manual is not followed
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
WHAT TO DO IF YOU SMELL GAS:
a. Do not try to light any appliance.
b. Do not touch any electrical switch; do not use
any phone in your building.
c. Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
d. If you cannot reach your gas supplier, call the
fire department.
Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
5INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A
Johnson Controls Ducted Systems

WARNING
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow saftey warnings exactly could result in
dangerous operation, serious injury, death or property
damage.
Improper servicing could result in dangerous
operation, serious injury, death or property damage.
• Before servicing, disconnect all electrical power to
furnace.
• When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
Due to system pressure, moving parts, and electrical
components, installation and servicing of air
conditioning equipment can be hazardous. Only
qualified, trained service personnel should install,
repair, or service this equipment. Untrained
personnel can perform basic maintenance functions
of cleaning coils and filters and replacing filters.
Observe all precautions in the literature, labels,
and tags accompanying the equipment whenever
working on air conditioning equipment. The
installation must conform with local building codes
or, in the absence of local codes, with the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the
National Gas and Propane Installation Code, CSA
B149.1.
Wear safety glasses and work gloves. Use
quenching cloth and have a fire extinguisher
available during brazing operations.
Inspection
As soon as a unit is received, it should be inspected
for possible damage during transit. If damage is
evident, the extent of the damage should be noted
on the carrier’s freight bill. A separate request for
inspection by the carrier’s agent should be made in
writing.
CAUTION
This product must be installed in strict compliance
with the enclosed installation instructions and any
applicable local, state and national codes including,
but not limited to, building, electrical, and mechanical
codes.
The furnace and its individual shut-off valve must
be disconnected from the gas supply piping system
during any pressure testing at pressures in excess of
1/2 PSIG.
Pressures greater than 1/2 PSIG will cause gas valve
damage resulting in a hazardous condition. If it is
subjected to a pressure greater than 1/2 PSIG, the
gas valve must be replaced.
The furnace must be isolated from the gas supply
piping system by closing its individual manual shut-
off valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than
1/2 PSIG.
Reference
Additional information is available in the following
reference forms:
• Technical Guide - ZX/ZY/ZQ04-14 1068152
• General Installation - ZXA7-14 5943356
• Economizer Accessory -
- Vertical Flow Dry Bulb Economizer
Field Installed
- Horizontal Flow Dry Bulb Economizer
Field Installed
• Power Exhaust -
- Vertical Flow Dry Bulb Economizer
Field Installed
- Horizontal Flow Dry Bulb Economizer
Field Installed
Renewal Parts
Contact your local Ducted Systems parts distribution
center for authorized replacement parts.
Approvals
Design certified by CSA as follows:
1. For use as a cooling only unit, cooling unit
with a forced air furnace.
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A6
Johnson Controls Ducted Systems

2. For outdoor installation only.
3. For installation on combustible material and
may be installed directly on combustible
flooring or, in the U.S., on wood flooring
or Class A, Class B, or Class C roof covering
materials.
4. For use with natural gas.
CAUTION
This product must be installed in strict compliance
with the enclosed installation instructions and any
applicable local, state, and national codes including,
but not limited to, building, electrical, and mechanical
codes.
WARNING
Improper installation may create a condition where the
operation of the product could cause personal injury
or property damage.
CAUTION
This system uses R-410A Refrigerant which operates
at higher pressures than R-22. No other refrigerant
may be used in this system.
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A 7
Johnson Controls Ducted Systems

Nomenclature
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A8
Johnson Controls Ducted Systems

Installation
Installation Safety Information
About this task:
Read these instructions before continuing
this appliance installation. This is an outdoor
combination heating and cooling unit. The installer
must assure that these instructions are made
available to the consumer and with instructions to
retain them for future reference.
1. Refer to the unit rating plate for the approved
type of gas for this product.
2. Install this unit only in a location and position
as specified in the Location section of these
instructions.
3. Never test for gas leaks with an open flame.
Use commercially available soap solution
made specifically for the detection of leaks
when checking all connections, as specified
on Installation Safety Information, Gas
Connection, and Post Start Checklist of these
instructions.
4. Always install furnace to operate within the
furnace's intended temperature-rise range
with the duct system and within the allowable
external static pressure range, as specified on
the unit name/rating plate, specified in the
Physical Data of these instructions.
5. This equipment is not to be used for
temporary heating of buildings or structures
under construction.
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could
result in serious injury, death, or property damage.
Never test for gas leaks with an open flame. Use
a commercially available soap solution made
specifically for the detection of leaks to check all
connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
Preceding Installation
1. Remove the two screws that hold the brackets
in the forklift slots on the side of the unit.
Figure 1: Unit shipping bracket
A Bracket screws
B Bracket
2. Turn each bracket toward the ground. The
protective plywood covering drops to the
ground.
3. Remove the protective covering from the
condenser coil prior to operation.
Figure 2: Protective condenser covering
4. If a factory option convenience outlet is
installed, you must install the weatherproof
outlet cover in the field. The cover is located
behind the filter access panel.
a. Remove the shipping label that covers the
convenience outlet.
b. Follow the instructions on the back of the
cover box.
c. Attach the cover to the unit with the four
screws provided.
CAUTION
208/230-3-60 and units with factory installed Powered
Convenience Outlet Option are wired for 230v power
supply. Change tap on transformer for 208-3-60
operation. See unit wiring diagram.
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A 9
Johnson Controls Ducted Systems

5. For gas heating models, you must move
the supply air temperature (SAT) sensor to
the working position to ensure proper SAT
readings. The SAT sensor is shipped in the
supply air compartment.
a. Move the SAT sensor to the inside of the
supply air duct. See Item A in Figure 5.
b. Use the excess wire available to its full
length to drop or mount the SAT sensor in
the duct. Avoid close contact with the gas
heat exchanger.
c. Use the shipping bracket to hold the SAT
sensor in the supply air stream. See Figure
3 for the factory SAT sensor location and
Figure 5 for the sensor relocation.
Figure 3: Supply air temperature sensor
6. For units equipped with an economizer or
motorized OD air damper, you must move
the return air temperature (RAT) sensor to
the working position to ensure proper RAT
readings. See Item B in Figure 5.
a. Move the RAT sensor to the inside of
the return air duct, verifying that the
sensor is at least 6 in. below the unit duct
opening. The sensor must read the return
air temperature, not mixed return air and
outdoor air temperatures.
b. Use the excess wire available to its full
length to drop or mount the RAT sensor in
the duct.
c. You can use the shipping bracket to hold
the RAT sensor in the return air stream.
See Figure 4 for the factory RAT sensor
location and Figure 5 for the sensor
relocation.
Figure 4: Return air temperature sensor
A Filter rack and filters
B RAT sensor
Figure 5: Supply and return air ducts
A Supply air duct
B Return air duct
7. If an optional return air smoke detector is
installed, you must move the return air sensor
from the factory shipped position (upside
down) to the working position (right side up).
Then slide the flex tube over the stub and
tighten, see Figure 7.
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A10
Johnson Controls Ducted Systems

Figure 6: Return air smoke detector - shipped
position
A Flex tube secured to the bracket
B Return air sensor
C Controller
D Wire tie
Figure 7: Return air smoke detector - working
position
A Controller
B Return air sensor
C Flex tube in the working position
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A 11
Johnson Controls Ducted Systems

Limitations
These units must be installed in accordance with the
following:
In U.S.A.:
• National Electrical Code, ANSI/NFPA No. 70 -
Latest Edition
• National Fuel Gas Code, ANSI Z223.1 - Latest
Edition
• Gas-Fired Central Furnace Standard, ANSI
Z21.47a. - Latest Edition
• Local building codes, and
• Local gas utility requirements
In Canada:
• Canadian Electrical Code, CSA C22.1
• Installation Codes, CSA - B149.1
• Local plumbing and waste water codes, and
• Other applicable local codes.
Refer to unit application data found in this
document.
After installation, gas fired units must be adjusted to
obtain a temperature rise within the range specified
on the unit rating plate.
If components are to be added to a unit to meet
local codes, they are to be installed at the dealer’s
and/or customer’s expense.
Size of unit for proposed installation should be
based on heat loss/heat gain calculation made
according to the methods of Air Conditioning
Contractors of America (ACCA).
This furnace is not to be used for temporary heating
of buildings or structures under construction.
Table 1: ZXA7, 08-14 Unit Limitations
Unit Limitations
Applied Voltage Outdoor
DB Temp
Model Size
(Tons) Unit Voltage SCCR (kVA)
Min Max Max (°F)
208/230-3-60 5 187 252 125
460-3-60 5 432 504 125ZX A7 (6)
575-3-60 5 540 630 125
208/230-3-60 5 187 252 125
460-3-60 5 432 504 125ZX 08 (7.5)
575-3-60 5 540 630 125
208/230-3-60 5 187 252 125
460-3-60 5 432 504 125ZX 09 (8.5)
575-3-60 5 540 630 125
208/230-3-60 5 187 252 125
460-3-60 5 432 504 125ZX 12 (10)
575-3-60 5 540 630 125
Table 1: ZXA7, 08-14 Unit Limitations
Unit Limitations
Applied Voltage Outdoor
DB Temp
Model Size
(Tons) Unit Voltage SCCR (kVA)
Min Max Max (°F)
208/230-3-60 5 187 252 125
460-3-60 5 432 504 125
ZX 14 (12.5)
575-3-60 5 540 630 125
Location
Use the following guidelines to select a suitable
location:
1. Unit is designed for outdoor installation only.
2. Condenser coils must have an unlimited
supply of air. Where a choice of location is
possible, position the unit on either north or
east side of building.
3. Suitable for mounting on roof curb.
4. For ground level installation, use a level
concrete slab with a minimum thickness of
4 inches. The length and width should be at
least 6 inches greater than the unit base rails.
Do not tie slab to the building foundation.
5. Roof structures must be able to support the
weight of the unit and its options/accessories.
Unit must be installed on a solid, level roof
curb or appropriate angle iron frame.
6. Maintain level tolerance to 1/2 in. across the
entire width and length of unit.
WARNING
Excessive exposure of this furnace to contaminated
combustion air will result in safety and performance
related problems. Typical contaminates include:
permanent wave solution, chlorinated waxes and
cleaners, chlorine based swimming pool chemicals,
water softening chemicals, de-icing salts or chemicals,
carbon tetrachloride, Halogen type refrigerants,
cleaning solvents (e.g. perchloroethylene), printing
inks, paint removers, varnishes, hydrochloric acid,
cements and glues, anti-static fabric softeners for
clothes dryers, masonry acid washing materials.
Clearances
All units require particular clearances for proper
operation and service. Installer must make
provisions for adequate combustion and ventilation
air in accordance with section 5.3 of Air for
Combustion and Ventilation of the National Fuel
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A12
Johnson Controls Ducted Systems

Gas Code, ANSI Z223.1 – Latest Edition (in U.S.A.),
or Sections 7.2, 7.3, or 7.4 of Gas Installation
Codes, CSA-B149.1 (in Canada) - Latest Edition,
and/or applicable provisions of the local building
codes. Refer to Table 4 for clearances required for
combustible construction, servicing, and proper unit
operation.
WARNING
Do not permit overhanging structures or shrubs to
obstruct condenser air discharge outlet, combustion
air inlet or vent outlets.
Rigging and Handling
Exercise care when moving the unit. Do not remove
any packaging until the unit is near the place of
installation. Rig the unit by attaching chain or cable
slings to the lifting holes provided in the base rails.
Spreader bars, whose length exceeds the largest
dimension across the unit, MUST be used across the
top of the unit.
CAUTION
If a unit is to be installed on a roof curb other than a
Ducted Systems roof curb, gasketing must be applied
to all surfaces that come in contact with the unit
underside.
CAUTION
Before lifting, make sure the unit weight is distributed
equally on the rigging cables so it will lift evenly.
Units may be moved or lifted with a forklift. Slotted
openings in the base rails are provided for this
purpose.
LENGTH OF FORKS MUST BE A MINIMUM OF
60INCHES.
CAUTION
All panels must be secured in place when the unit is
lifted.
The condenser coils should be protected from rigging
cable damage with plywood or other suitable material.
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A 13
Johnson Controls Ducted Systems

ZXA7, 08-14 Unit Weights
Figure 8: Unit 4 Point Load Weight Figure 9: Unit 6 Point Load Weight
Figure 10: Center of Gravity
Table 2: ZXA7, 08-14 Corner Weights
Weight (lb) Center of gravity 4-Point load location (lb) 6-Point load location (lb)
Model Size
(tons) Shipping Operating X Y A B C D A B C D E F
ZXE A7 (6) 634 614 34 25 168 146 139 160 115 104 95 91 99 109
ZXE 08 (7.5) 787 782 47 36 211 245 175 151 138 151 167 119 108 98
ZXE 09 (8.5) 847 842 46 36 227 259 189 166 148 161 176 129 118 109
ZXE 12 (10) 874 869 46 36 239 268 191 170 156 169 182 130 120 111
ZXE 14 (12.5) 936 931 45 36 262 281 200 187 173 181 190 135 129 123
ZXG A7 (6) 688 668 34 25 183 159 152 174 125 114 104 99 108 119
ZXG 08 (7.5) 889 884 46 37 249 282 188 166 162 176 192 128 117 108
ZXG 09 (8.5) 949 944 45 36 266 288 203 187 175 184 194 137 130 123
ZXG 12 (10) 980 975 45 37 281 298 204 192 185 193 201 137 132 127
ZXG 14 (12.5) 1042 1037 44 37 301 309 216 210 200 203 207 145 142 140
Table 3: ZXA7, 08-14 Unit Accessory Weights
Unit accessory Weights (lb)
Vertical Flow Dry Bulb Economizer Large Footprint 60
Horizontal Flow Dry Bulb Economizer Large Footprint Short 79
Horizontal Flow Dry Bulb Economizer Large Footprint Tall 82
Power Exhaust Vert Flow Large Footprint 75
Power Exhaust Horiz Flow Large Footprint 80
Hail Guard Kit Large Short Factory Installed 36
Hail Guard Kit Large Tall Factory Installed 44
Flue Extension Kit (1FE0416) 20
Curb Rigid 14 in. Large Footprint 126
Curb Rigid 24 in. Large Footprint 222
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A14
Johnson Controls Ducted Systems

Figure 11: ZXA7 Unit Dimensions
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A 15
Johnson Controls Ducted Systems

Figure 12: ZX08 Unit Dimensions
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A16
Johnson Controls Ducted Systems

Figure 13: ZX09/12 Unit Dimensions
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A 17
Johnson Controls Ducted Systems

Figure 14: ZX14 Unit Dimensions
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A18
Johnson Controls Ducted Systems

Table 4: ZXA7, 08-14 Unit Clearances
Direction Distance (in.) Direction Distance (in.)
1 Top172 Right 18
Front 48 Left 12
Rear 2, 3 182/3634 Bottom41
1 Units must be installed outdoors. Over hanging structure or
shrubs should not obscure condenser air discharge outlet.
2 Units without economizer or power exhaust.
3 Units equipped with an Economizer or Power Exhaust. Flue
products must not be discharged within 10 Feet of the rear
of the unit.
4 Units may be installed on combustible floors made from
wood or class A, B or C roof covering materials.
Figure 15: 1RC0456, 1RC0458 Roof Curb Dimensions
Unit Models used with 1RC0456, 1RC0458 Roof Curb
• ZXA7
Note: If utilities are required thru the base of
the unit or thru the roof curb the following field
installed accessories can be purchased thru
your dealer or contractor:
1TB0401 - Thru the base electrical and thru the
curb gas
1TB0403 - Thru the base electrical and gas
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A 19
Johnson Controls Ducted Systems

Figure 16: 1RC0457, 1RC0459 Roof Curb Dimensions
Unit Models used with 1RC0457, 1RC0459 Roof Curb
• ZX08
• ZX09
• ZX12
• ZX14
Note: If utilities are required thru the base of
the unit or thru the roof curb the following field
installed accessories can be purchased thru
your dealer or contractor:
1TB0401/1TB0402 - Thru the base electrical and
thru the curb gas
1TB0403/1TB0404 - Thru the base electrical and
gas
Ductwork
Ductwork should be designed and sized according
to the methods in Manual D of the Air Conditioning
Contractors of America (ACCA) or as recommended
by any other recognized authority such as ASHRAE
or SMACNA.
A closed return duct system should be used. This
will not preclude use of economizers or outdoor
fresh air intake. The supply and return air duct
connections at the unit should be made with flexible
joints to minimize noise.
The supply and return air duct systems should
be designed for the CFM and static pressure
requirements of the job. They should NOT be sized
to match the dimensions of the duct connections on
the unit.
Refer to Figure 12 thru Figure 14 for bottom and
side air duct openings.
Duct Covers
Units are shipped with the side duct openings
covered and a covering over the bottom of the unit.
For bottom duct application, Models ZX08 require
a filler plate to be removed from the return air
opening, for all other models no other changes are
necessary. For side duct application, remove the
side duct covers and install over the bottom duct
openings. The panels removed from the side duct
connections are designed to be reused by securing
each panel to its respective bottom duct opening.
But keep in mind that the supply and return panels
are installed with the painted surface DOWN,
facing the bottom duct opening. The gasket must
be removed from the insulation side of the duct
cover so it is not directly exposed to the heating
elements.The panels are secured by sliding them
INSTALLATION MANUAL ZX SERIES 6-12.5Ton 60 Hertz R-410A20
Johnson Controls Ducted Systems