AAON RZ Series Packaged Rooftop Units and Outdoor Air Handling Units Instruction Manual
- June 15, 2024
- AAON
Table of Contents
AAON RZ Series Packaged Rooftop Units and Outdoor Air Handling Units
Product Information
Specifications
- Product Name: RZ SERIES
- Capacity: 45-240 tons
- Type: Packaged Rooftop Units & Outdoor Air Handling Units
- Certification: UL-60335
Product Usage Instructions
Installation
- Before installation, carefully read and understand the installation instructions provided in this manual.
- Ensure proper preparation of the installation site, including a level and stable foundation.
- Follow all safety warnings and precautions to prevent fire or explosion hazards.
- For proper installation, it is recommended to hire a professional technician.
Operation
- Familiarize yourself with the operation instructions provided in this manual.
- Ensure that the unit is connected to a reliable power source and all electrical connections are secure.
- Follow the recommended startup procedure provided in the manual.
- Regularly monitor the unit’s performance and address any issues promptly.
Maintenance
- Regular maintenance is essential for optimal performance and longevity of the unit.
- Follow the maintenance schedule outlined in the manual.
- Before performing any maintenance tasks, disconnect all electrical power to the unit.
- Use only recommended cleaning agents and tools for maintenance.
- If unsure about any maintenance procedure, contact a Factory Trained Service Technician.
FAQ
Q: What should I do if I smell gas?
A: If you smell gas, follow these steps:
- Do not try to light any appliance or touch any electrical switch.
- Do not use any phone in the building.
- Leave the building immediately.
- Call your gas supplier from a phone remote from the building and follow their instructions.
- If you cannot reach your gas supplier, call the fire department.
Q: Can I perform servicing on the unit myself?
A: It is recommended to have servicing performed by a Factory Trained
Service Technician to ensure safe and proper operation of the unit.
RZ SERIES
(45-240 tons)
Packaged Rooftop Units & Outdoor Air Handling Units
Installation, Operation, & Maintenance
UL-60335
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in serious injury,
death or property damage.
Be sure to read and understand the installation, operation and service
instructions in this manual.
Improper installation, adjustment, alteration, service or maintenance can
cause serious injury, death or property damage.
A copy of this IOM must be kept with the unit.
WARNING
o Do not store gasoline or other flammable vapors and liquids in the vicinity
of this or any other appliance
o WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance. Do not touch
any electrical switch; do not use any phone in your building. Leave the
building immediately. Immediately call your gas supplier from a phone remote
from the building. Follow the gas supplier’s instructions. If you cannot reach
your gas supplier, call the fire department.
o Startup and service must be performed by a Factory Trained Service
Technician.
AAON® RZ Series Features and Options Introduction
Energy Efficiency · Direct Drive Airfoil Plenum Supply Fans · Variable Speed
R-410A and
R-454B Scroll Compressors · AAON Evaporative Condenser · Airside Economizer ·
Factory Installed AAONAIRE® Energy
Recovery Wheels · Double Wall Rigid Polyurethane Foam
Panel Construction, R-13 Insulation · Modulating Gas Heaters · Modulating/SCR
Electric Heaters · Premium Efficiency Permanent Magnet
Motors · Variable Speed Supply/Return/Exhaust
Fans
Indoor Air Quality · 100% Outside Air · Outside Airflow Monitoring ·
Economizer CO2 Override · High Efficiency Filtration · Final Filters,
including Gas Heat Systems · UV Lights for Single Pass 90% Air
Disinfection · Double Wall Rigid Polyurethane Foam
Panel Construction, R-13 Insulation · Interior Corrosion Protection
Humidity Control · High Capacity Cooling Coils · Variable Speed Compressors ·
Factory Installed AAONAIRE Total
Energy Recovery Wheels · Modulating Hot Gas Reheat
Safety · Burglar Bars · Freeze Stats · Phase and Brown Out Protection ·
Supply/Return Smoke Detectors · Supply/Return Firestats · Remote Safety
Shutdown Terminals · SA & RA Opening Walkable
Safety Grates
Installation and Maintenance · Clogged Filter Switch · Color Coded Wiring
Diagram · Compressors in Isolated Compartment · Compressor Isolation Valves ·
Convenience Outlet · Direct Drive Supply Fans · VFD Shaft Grounding · Hinged
Access Doors with Lockable
Handles · Magnehelic Gauge · Service Lights · Sight Glasses · BACnet MSTP with
Diagnostics · Remote Start-Stop Terminals · Access Door Windows · Motorized
Fresh Air Service Vestibule
System Integration · Chilled Water Cooling Coils · Electric/Natural Gas/LP
Heating · Hot Water/Steam Heating Coil · Non-Compressorized DX Coils
Environmentally Friendly · Airside Economizers · Factory Installed AAONAIRE
Energy
Recovery Wheels · R-410A Refrigerant · R-454B Refrigerant
Extended Life · 5 Year Compressor Warranty · 25 Year Stainless Steel Heat
Exchanger
Warranty · Interior Corrosion Protection · Polymer E-Coated Coils – 5 Year
Coating
Warranty · Stainless Steel Coil Casing · Stainless Steel Drain Pans
8
Safety
Attention must be paid to the following statements:
NOTE – Notes are intended to clarify the unit installation, operation and
maintenance.
CAUTION – Caution statements are given to prevent actions that may result in
equipment damage, property damage, or personal injury.
WARNING – Warning statements are given to prevent actions that could result in
equipment damage, property damage, personal injury or death.
DANGER – Danger statements are given to prevent actions that will result in
equipment damage, property damage, severe personal injury or death.
WARNING
ELECTRIC SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety 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 the furnace. More than
one disconnect may be provided.
When servicing controls, label all wires prior to disconnecting. Reconnect
wires correctly.
Verify proper operation after servicing. Secure all doors with key-lock or nut
and bolt.
CAUTION
WHAT TO DO IF YOU SMELL GAS
Do not try to turn on unit. Shut off main gas supply. Do not touch any
electric switch. Do not use any phone in the
building. Never test for gas leaks with an
open flame. Use a gas detection soap solution
and check all gas connections and shut off valves.
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eselercvticriicnagl, psohwuteroftfoaltlheeleucntriitcatol paovwoeidr
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to avoid shock hazard or injury from rotating parts. Follow proper Lockout-
Tagout procedures.
9
WARNING
FIRE, EXPLOSION OR CARBON MONOXIDE POISONING HAZARD
Failure to replace proper controls could result in fire, explosion or carbon
monoxide poisoning. Failure to follow safety warnings exactly could result in
serious injury, death or property damage. Do not store or use gasoline or
other flammable vapors and liquids in the vicinity of this appliance.
WARNING
On heaters which recirculate room air, outside ventilation air must be
provided in accordance with the information shown on the heater nameplate.
WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow instructions could result in severe personal injury or death
due to carbon-monoxide poisoning, if combustion products infiltrate into the
building.
Check that all openings in the outside wall around the vent (and air intake)
pipe(s) are sealed to prevent infiltration of combustion products into the
building.
Check that furnace vent (and air intake) terminal(s) are not obstructed in any
way during all seasons.
10
WARNING
During installation, testing, servicing, and troubleshooting of the equipment
it may be necessary to work with live
components. Only a qualified licensed electrician or individual properly
trained in handling live electrical components must perform these tasks.
Standard NFPA-70E, an OSHA regulation requiring an Arc Flash Boundary to be
field established and marked for identification of where appropriate Personal
Protective Equipment (PPE) be worn, must be followed.
CAUTION
Unit power supply wire must be only copper or aluminum.
WARNING
ROTATING COMPONENTS
Unit contains fans with moving parts that can cause serious injury. Do not
open door containing fans until the power to the unit has been disconnected
and fan wheel has stopped rotating.
WARNING
GROUNDING REQUIRED
All field installed wiring must be completed by qualified personnel. Field
installed wiring must comply with NEC/CEC, local and state electrical code
requirements. Failure to follow code requirements could result in serious
injury or death. Provide proper unit ground in accordance with these code
requirements.
WARNING
VARIABLE FREQUENCY DRIVES
Do not leave VFDs unattended in hand mode or manual bypass. Damage to
personnel or equipment can occur if left unattended. When in hand mode or
manual bypass mode VFDs will not respond to controls or alarms.
CAUTION
Electric motor over-current protection and overload protection may be a
function of the Variable Frequency Drive to which the motors are wired. Never
defeat the VFD motor overload feature. The overload ampere setting must not
exceed 115% of the electric motors FLA rating as shown on the motor nameplate.
WARNING
UNIT HANDLING
To prevent injury or death, lifting equipment capacity must exceed unit weight
by an adequate safety factor. Always test-lift unit not more than 24 inches
high to verify proper center of gravity lift point to avoid unit damage,
injury or death.
CAUTION
Failure to properly drain and vent coils when not in use during freezing
temperature may result in coil and equipment damage.
CAUTION
Rotation must be checked on all MOTORS AND COMPRESSORS of 3 phase units at
startup by a qualified service technician. Scroll compressors are directional
and can be damaged if rotated in the wrong direction. Compressor rotation must
be checked using suction and discharge gauges. Fan motor rotation must be
checked for proper operation. Alterations must only be made at the unit power
connection
WARNING
Do not use oxygen, acetylene or air in place of refrigerant and dry nitrogen
for leak testing. A violent explosion may result causing injury or death.
11
WARNING
WATER PRESSURE
Prior to connection of condensing water supply, verify water pressure is less
than maximum pressure shown on unit nameplate. To prevent injury or death due
to instantaneous release of high pressure water, relief valves must be field
supplied on system water piping.
WARNING
Always use a pressure regulator, valves and gauges to control incoming
pressures when pressure testing a system. Excessive pressure may cause line
ruptures, equipment damage or an explosion which may result in injury or
death.
CAUTION
To prevent damage to the unit, do not use acidic chemical coil cleaners. Do
not use alkaline chemical coil cleaners with a pH value greater than 8.5,
after mixing, without first using an aluminum corrosion inhibitor in the
cleaning solution.
WARNING
Some chemical coil cleaning
compounds are caustic or toxic. Use
these substances only in accordance
with the manufacturer’s
usage
instructions. Failure to follow
instructions may result in equipment
damage, injury or death.
12
CAUTION
Do not clean DX refrigerant coils with hot water or steam. The use of hot
water or steam on refrigerant coils will cause high pressure inside the coil
tubing and damage to the coil.
CAUTION
Door compartments containing hazardous voltage or rotating parts are equipped
with door latches to allow locks. Door latch are shipped with nut and bolts
requiring tooled access. If you do not replace the shipping hardware with a
pad lock always re-install the nut & bolt after closing the door.
CAUTION
Cleaning the cooling tower or condenser water loop with harsh chemicals such
as hydrochloric acid (muriatic acid), chlorine or other chlorides, can damage
the refrigerantto-water heat exchanger. Care must be taken to avoid allowing
chemicals to enter the refrigerant-to-water heat exchanger. See Appendix A –
Heat Exchanger Corrosion Resistance for more information.
CAUTION
In order to avoid a hazard due to inadvertent resetting of the THERMAL CUT-
OUT, this appliance must not be supplied through an external switching device,
such as a timer, or connected to a circuit that is regularly switched on and
off by the utility.
WARNING
OPEN LOOP APPLICATIONS
Failure of the condenser as a result of chemical corrosion is excluded from
coverage under AAON Inc. warranties and the heat exchanger manufacturer’s
warranties.
WARNING
WATER FREEZING
Failure of the condenser due to freezing will allow water to enter the
refrigerant circuit and will cause extensive damage to the refrigerant circuit
components. Any damage to the equipment as a result of water freezing in the
condenser is excluded from coverage under AAON warranties and the heat
exchanger manufacturer warranties.
WARNING
COMPRESSOR CYCLING
3 MINUTE MINIMUM OFF TIME To prevent motor overheating compressors must cycle
off for a minimum of 3 minutes.
5 MINUTE MINIMUM ON TIME To maintain the proper oil level compressors must
cycle on for a minimum of 5 minutes.
The cycle rate must not exceed 7 starts per hour.
WARNING
UV LIGHTS
Never expose eyes or skin to UVC light from any source, as personal injury may
result. Wear gloves, face shield/glasses (per ANSI Z87.1) and cover all
exposed skin.
WARNING
This appliance is not intended for use by persons with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety. Children must be
supervised around this appliance.
CAUTION
Disconnect power to the unit before servicing UV-C lamps
CAUTION
Doors and panels with access to UV-C lamps, with possible spectral irradiance
exceeding 1.7 W/cm2 are provided with an interlock switch. Do not over-ride.
WARNING
Do not operate UV-C lamps outside of the unit.
13
WARNING
Units containing UV-C Germicidal lamps should not be operated with damage to
the cabinet of the unit. UVC radiation may, even in small doses, cause harm to
the eyes and skin.
WARNING
Units with VFD driven motors/ compressors have adjustable overload settings.
These are set by the AAON factory for the protection of these
motors/compressors and must not be adjusted over this factory setpoint or
bypassed.
1. Startup and service must be performed by a Factory Trained Service
Technician.
2. Use only with type of the gas approved for the furnace. Refer to the
furnace rating plate.
3. The unit is for outdoor use only. See General Information section for more
information.
4. Provide adequate combustion ventilation air to the furnace. If a vent duct
extension is used, a class III approved vent is required. See the Locating
Units and Gas Heating sections of the Installation section of the manual.
5. Always install and operate furnace within the intended temperature rise
range and duct system external static pressure (ESP) as specified on the unit
nameplate.
6. The supply and return air ducts must be derived from the same space. It is
recommended ducts be provided with access panels to allow inspection for duct
tightness. When a down flow duct is used with electric heat, the exhaust duct
must be an L shaped duct.
7. Clean furnace, duct, and components upon completion of the construction
setup. Verify furnace operating conditions including input rate, temperature
rise, and ESP.
8. Every unit has a unique equipment nameplate with electrical, operational,
and unit clearance specifications. Always refer to the unit nameplate for
specific ratings unique to the model you have purchased.
9. READ THE ENTIRE INSTALLATION, OPERATION, AND MAINTENANCE MANUAL. OTHER
IMPORTANT SAFETY PRECAUTIONS ARE PROVIDED THROUGHOUT THIS MANUAL.
10. Keep this manual and all literature safeguarded near or on the unit.
14
RZ Series Feature String Nomenclature
9 D
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
5 E
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 D
3 C
3 B
8
7
16D 3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZ E
2
1
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 – M0 – C – 0 0 0 – 8 0 – DA 0 B – 0 0 – 0 0 0 – ABEQ 0A – E 0 0 0 0 0 – 0 0 0 0 0DB
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
MODEL OPTIONS
SERIES AND GENERATION RZ
MAJOR REVISION A
UNIT SIZE
Air-Cooled Condenser 45 = 45 ton Capacity 55 = 55 ton Capacity 65 = 65 ton Capacity 75 = 75 ton Capacity 90 = 90 ton Capacity 105 = 105 ton Capacity 120 = 120 ton Capacity 130 = 130 ton Capacity 140 = 140 ton Capacity 145 = 145 ton Capacity 160 = 160 ton Capacity 180 = 180 ton Capacity 200 = 200 ton Capacity 220 = 220 ton Capacity 240 = 240 ton Capacity
Evaporative Condenser 51 = 51 ton Capacity 66 = 66 ton Capacity 73 = 73 ton Capacity 79 = 79 ton Capacity 101 = 101 ton Capacity 109 = 109 ton Capacity 124 = 124 ton Capacity 136 = 136 ton Capacity 148 = 148 ton Capacity 161 = 161 ton Capacity 172 = 172 ton Capacity 197 = 197 ton Capacity 221 = 221 ton Capacity 241 = 241 ton Capacity 261 = 261 ton Capacity
SERIES
Air-Cooled A = 45-75 ton units B = 90-105 ton units C = 120-140 ton units D = 145-180 ton units E = 200-240 ton units
Evaporative Condenser A = 51-79 ton units B = 101-109 ton units C = 124-148 ton units D = 161-197 ton units E = 221-261 ton units
MINOR REVISION 0 = RZ-075 and higher A = only for RZ-045,055,065 changing to 2-circuits
VOLTAGE 2 = 230V/3 /60Hz 3 = 460V/3 /60Hz 4 = 575V/3 /60Hz 8 = 208V/3 /60Hz
Model Option A: COOLING/HEAT PUMP A1: COMPRESSOR STYLE 0 = No Compressor C =
R-410A Variable Speed Scroll Compressor H= R-454B Variable Speed Scroll
Compressor N = DX Air Handling Unit
A2: CONDENSER STYLE 0 = No Condenser A = Microchannel Air-Cooled Condenser H =
Evaporative Condenser
A3: INDOOR COIL CONFIGURATION 0 = No Cooling Coil A = Std Row Std Size
Evaporator B = 6 Row Std Size Evaporator C = Std Row Large Size Evaporator D =
6 Row Large Size Evaporator E = 4 Row Chilled Water Coil Std Size F = 6 Row
Chilled Water Coil Std Size G = 8 Row Chilled Water Coil Std Size H = 4 Row
Chilled Water Coil Large Size J = 6 Row Chilled Water Coil Large Size K = 8
Row Chilled Water Coil Large Size
A4: COOLING HEAT EXCHANGER CONSTRUCTION 0 = Standard A = Polymer E-Coated
Cooling Coil B = Stainless Steel Cooling Coil Casing D = Stainless Steel
Cooling Coil Casing + Polymer ECoated Cooling Coil E = Polymer E-Coated Cond.
Coil J = Polymer E-Coated Evap. And Cond. Coil T = Stainless Steel Cooling
Coil Casing + Polymer ECoated Evap. And Cond. Coil
15
RZ Series Feature String Nomenclature
9 D
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
8
7
5 E 2 5
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 D
3 C
3 B
16D 3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZE
2
1
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 -M0 – C – 0 0 0 – 8 0 – DA0 B – 0 0 – 0 0 0 – ABEQ0 A – E 0 0 0 0 0 – 0 0 0 0 0DB
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
A5: COOLING STAGING 0 = No Cooling A = Full Face Variable Capacity + Tandem
On/Off Refrigeration Systems E = All Variable Capacity Refrigeration Systems F
= Single Serpentine 8 FPI G = Half Serpentine 8 FPI H = Single Serpentine 10
FPI J = Half Serpentine 10 FPI K = Single Serpentine 12 FPI L = Half
Serpentine 12 FPI M = DX Air Handling Unit with 4 Refrigeration Circuits N =
DX Air Handling Unit with 8 Refrigeration Circuits
Model Option B: HEATING B1: HEAT TYPE 0 = No Heat B = Electric Heat D =
Natural Gas Single Rack E = Natural Gas Double Rack K = Hot Water Coil M =
Steam Distributing Coil
B2: HEAT CONSTRUCTION 0 = Standard B = Stainless Steel Heat Exchanger D = High
Altitude Stainless Steel Heat Exchanger G = Polymer E-Coated Heating Coil
B3: HEAT DESIGNATION 0 = No Heat 1 = Heat 1 2 = Heat 2 3 = Heat 3 4 = Heat 4 5
= Heat 5 6 = Heat 6 7 = Heat 7 8 = Heat 8
16
B3: HEAT DESIGNATION Continued A = 1 Row Size A B = 1 Row Size B C = 1 Row
Size C D = 1 Row Size D E = 2 Row Size A F = 2 Row Size B G = 2 Row Size C H =
2 Row Size D
B4: HEAT STAGING 0 = No Heat A = 1 Stage B = 2 Stage C = 3 Stage D = 4 Stage E
= 5 Stage F = 6 Stage G = 7 Stage H = 8 Stage V = 10 Stage J = 12 Stage K =
Modulating Gas Heat Temp Control L = High Turndown Modulating Gas Heat
Temperature Control M = Modulating SCR with Temperature Control N = Modulating
SCR with External 0-10 VDC R = Single Serpentine 10 FPI S = Half Serpentine 10
FPI
B5: HEAT PUMP AUX HEATING 0 = No Heat Pump
RZ Series Feature String Nomenclature
9 D
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
8
7
5 E 2 5
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 D
3 C
3 B
3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZE
2
1
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 – M0 – C – 0 0 0 – 8 0 – DA0 B – 0 0 – 0 0 0 – ABEQ 0 A – E 0 0 0 0 0 – 0 0 0 0 0 DB
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16D
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
1: UNIT ORIENTATION E = Draw Through SA Fan, Walk-in Vestibule, Left
Side Access F = Draw Through SA Fan, Walk-in Vestibule, Right
Side Access G = Draw Through SA Fan, Non-compressorized,
End Control Panel, Left Access H = Draw Through SA Fan, Non-compressorized,
End Control Panel, Right Access J = Draw Thru Supply Fan, Non-compressorized,
Left Control Panel, Left Access K = Draw Thru Supply Fan, Non-compressorized,
Right Control Panel, Right Access L = Draw Through SA Fan, Non-compressorized,
Walk-in Vestibule, Left Access M = Draw Through SA Fan, Non-compressorized,
Walk-in Vestibule, Right Access N = Blow Through SA Fan, Walk-in Vestibule,
Left
Side Access P = Blow Through SA Fan, Walk-in Vestibule, Right
Side Access Q = Blow Through SA Fan, Non-compressorized,
End Control Panel, Left Access R = Blow Through SA Fan, Non-compressorized,
End Control Panel, Right Access S = Blow Thru Supply Fan, Non-compressorized,
Left Control Panel, Left Access T = Blow Thru Supply Fan, Non-compressorized,
Right Control Panel, Right Access U = Blow Through SA Fan, Non-compressorized,
Walk-in Vestibule, Left Access V = Blow Through SA, Fan Non-compressorized,
Walk-in Vestibule, Right Access W = Draw Thru Supply Fan, End Control Panel,
Left
Side Air Tunnel Access Y = Draw Thru Supply Fan, End Control Panel,
Right Side Air Tunnel Access Z = Blow Thru Supply Fan. End Control Panel, Left
Side Air Tunnel Access 1 = Blow Thru Supply Fan. End Control Panel, Right
Side Air Tunnel Access
2: SUPPLY & RETURN LOCATIONS 0 = Bottom Supply–Bottom Return A = Bottom
Supply–No Return B = Bottom Supply–Left Return C = Bottom Supply–Right Return
D = Bottom Supply–End Return E = Left Supply–No Return F = Left Supply–Bottom
Return G = Left Supply–Left Return H = Left Supply–Right Return J = Left
Supply–End Return K = Right Supply–No Return L = Right Supply–Bottom Return M
= Right Supply–Left Return N = Right Supply–Right Return P = Right Supply–End
Return Q = Top Supply–No Return R = Top Supply–Bottom Return S = Top
Supply–Left Return T = Top Supply–Right Return U = Top Supply–End Return V =
End Supply + No Return W = End Supply + Bottom Return Y = End Supply + Left
Return Z = End Supply + Right Return 1 = End Supply + End Return
Feature 3: SUPPLY FAN OPTIONS 3A: SUPPLY FAN QUANTITY 0 = 1 Fan A = 2 Fans B =
3 Fans C = 4 Fans D = 5 Fans E = 6 Fans F = 7 Fans G = 8 Fans H = 9 Fans J =
10 Fans K = 11 Fans L = 12 Fans
17
RZ Series Feature String Nomenclature
9 D
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
5 E
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 D
3 C
3 B
8
7
16D 3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZE
2
1
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 -M0 – C – 0 0 0 – 8 0 – DA0 B – 0 0 – 0 0 0 – ABEQ0A – E 0 0 0 0 0 – 0 0 0 0 0DB
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
3B: SUPPLY FAN CONFIGURATION 0 = No VFDs + Full Width Fan A = 1 Fan per VFD +
Full Width Fan B = 2 Fans per VFD + Full Width Fan C = 3 Fans per VFD + Full
Width Fan D = 4 Fans per VFD + Full Width Fan E = No VFDs + Narrow Width Fan F
= 1 Fan per VFD + Narrow Width Fan G = 2 Fans per VFD + Narrow Width Fan H = 3
Fans per VFD + Narrow Width Fan J = 4 Fans per VFD + Narrow Width Fan K =
Option 0 + Inlet Backdraft Dampers L = Option A + Inlet Backdraft Dampers M =
Option B + Inlet Backdraft Dampers N = Option C + Inlet Backdraft Dampers P =
Option D + Inlet Backdraft Dampers Q = Option E + Inlet Backdraft Dampers R =
Option F + Inlet Backdraft Dampers S = Option G + Inlet Backdraft Dampers T =
Option H + Inlet Backdraft Dampers U = Option J + Inlet Backdraft Dampers
3C: SUPPLY FAN SIZE G = 27″ Direct Drive Backward Curved Plenum
Aluminum J = 30″ Direct Drive Backward Curved Plenum Steel K = 33″ Direct
Drive Backward Curved Plenum Steel L = 36.5″ Direct Drive Backward Curved
Plenum
Aluminum M = 42.5″ Direct Drive Backward Curved Plenum
Aluminum N = 18.5″ Direct Drive Airfoil Plenum Aluminum P = 22″ Direct Drive
Airfoil Plenum Aluminum Q = 24″ Direct Drive Airfoil Plenum Aluminum R = 27″
Direct Drive Airfoil Plenum Aluminum
3D: SUPPLY FAN MOTOR TYPE 0 = High Efficiency Open Motor (1170 nominal rpm) A
= High Efficiency Open Motor (1760 nominal
rpm) K = High Efficiency Totally Enclosed Motor (1170
nominal rpm)
18
3D: SUPPLY FAN MOTOR TYPE (continued) L = High Efficiency Totally Enclosed
Motor (1760
nominal rpm) P = Permanent Magnet AC Totally Enclosed Motor
(1760 nominal rpm)
3E: SUPPLY FAN MOTOR SIZE G = 3 hp H = 5 hp J = 7.5 hp K = 10 hp L = 15 hp M =
20 hp N = 25 hp P = 30 hp Q = 40 hp R = 50 hp
Feature 4: RETURN/OUTSIDE AIR OPTIONS 4A: OUTSIDE AIR SECTION 0 = 100% Outside
Air A = 100% Outside Air with Motorized Dampers B = Manual Outside Air +
Return Air Opening C = Motorized Outside Air Dampers + Return Air
Opening D = 100% Return Air E = Economizer G = Econ + Power Exhaust (Plenum
Fans) J = Econ + Power Return (Plenum Fans) Q = Econ + Energy Recovery +
Bypass Damper R = Econ + Energy Recovery + Bypass Damper +
Power Return (Plenum Fans)
4B: ENERGY RECOVERY TYPE 0 = No Energy Recovery A = Polymer Energy Recovery
Wheel B = Polymer Energy Recovery Wheel + 1% Purge C = Aluminum Energy
Recovery Wheel D = Aluminum Energy Recovery Wheel + 1% Purge
RZ Series Feature String Nomenclature
9 D
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
5 E
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 D
3 C
3 B
8
7
16D 3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZE
2
1
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 -M0 – C – 0 0 0 – 8 0 – DA0B – 0 0 – 0 0 0 – ABEQ0A – E 0 0 0 0 0 – 0 0 0 0 0DB
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
4C: ENERGY RECOVERY SIZE 0 = No Energy Recovery A = Small Enthalpy B = Medium Enthalpy C = Large Enthalpy D = Extra Large Enthalpy E = Small Sensible F = Medium Sensible G = Large Sensible H = Extra Large Sensible J = Small Enthalpy
- Exhaust Filters K = Medium Enthalpy + Exhaust Filters L = Large Enthalpy + Exhaust Filters M = Extra Large Enthalpy + Exhaust Filters N = Small Sensible
- Exhaust Filters P = Medium Sensible + Exhaust Filters Q = Large Sensible +
Exhaust Filters R = Extra Large Sensible + Exhaust Filters
Feature 5: RETURN FAN OPTIONS 5A: RETURN FAN QUANTITY 0 = No Return Fan A = 1 Fan B = 2 Fans C = 3 Fans D = 4 Fans
5B: RETURN FAN CONFIGURATION 0 = No Return Fan A = No VFDs + Full Width Fan B = 1 Fan per VFD + Full Width Fan C = 2 Fans per VFD + Full Width Fan D = 3 Fans per VFD + Full Width Fan E = 4 Fans per VFD + Full Width Fan F = No VFDs - Narrow Width Fan G = 1 Fan per VFD + Narrow Width Fan H = 2 Fans per VFD + Narrow Width Fan J = 3 Fans per VFD + Narrow Width Fan K = 4 Fans per VFD + Narrow Width Fan L = Option A + Inlet Backdraft Dampers M = Option B + Inlet Backdraft Dampers
5B: RETURN FAN CONFIGURATION Continued N = Option C + Inlet Backdraft Dampers
P = Option D + Inlet Backdraft Dampers Q = Option E + Inlet Backdraft Dampers
R = Option F + Inlet Backdraft Dampers S = Option G + Inlet Backdraft Dampers
T = Option H + Inlet Backdraft Dampers U = Option J + Inlet Backdraft Dampers
V = Option K + Inlet Backdraft Dampers
5C: RETURN FAN SIZE 0 = No Return Fan N = 27″ Direct Drive Backward Curved
Plenum
Aluminum Q = 30″ Direct Drive Backward Curved Plenum Steel R = 33″ Direct
Drive Backward Curved Plenum Steel S = 36.5″ Direct Drive Backward Curved
Plenum
Aluminum T = 42.5″ Direct Drive Backward Curved Plenum
Aluminum U = 18.5″ Direct Drive Backwards Airfoil Aluminum V = 22″ Direct
Drive Backwards Airfoil Aluminum W = 24″ Direct Drive Backwards Airfoil
Aluminum Y = 27″ Direct Drive Backwards Airfoil Aluminum
5D: RETURN FAN MOTOR TYPE 0 = No Return Fan A = High Efficiency Open Motor
(1170 nominal
rpm) B = High Efficiency Open Motor (1760 nominal
rpm) L = High Efficiency Totally Enclosed Motor (1170
nominal rpm) M = High Efficiency Totally Enclosed Motor (1760
nominal rpm) P = Permanent Magnet AC Totally Enclosed Motor
(1170 nominal rpm) Q = Permanent Magnet AC Totally Enclosed Motor
(1760 nominal rpm)
19
RZ Series Feature String Nomenclature
9 D
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
8
7
5 E 2 5
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 D
3 C
3 B
16D 3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZE
2
1
3 7
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 – M0 – C – 0 0 0 – 8 0 – DA0 B – 0 0 – 0 0 0 – ABEQ 0 A – E 0 0 0 0 0 – 0 0 0 0 0 DB
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
5E: RETURN MOTOR SIZE 0 = No Return Fan H = 3 hp J = 5 hp K = 7.5 hp L = 10 hp
M = 15 hp N = 20 hp P = 25 hp Q = 30 hp R = 40 hp
Feature 6: EXHAUST FAN OPTIONS 6A: EXHAUST FAN QUANTITY 0 = No Exhaust Fan A =
1 Fan B = 2 Fans
6B: EXHAUST FAN CONFIGURATION 0 = No Exhaust Fan A = No VFDs + Full Width Fan
B = 1 Fan per VFD + Full Width Fan C = 2 Fans per VFD + Full Width Fan D = 3
Fans per VFD + Full Width Fan E = 4 Fans per VFD + Full Width Fan F = No VFDs
- Narrow Width Fan G = 1 Fan per VFD + Narrow Width Fan H = 2 Fans per VFD +
Narrow Width Fan J = 3 Fans per VFD + Narrow Width Fan K = 4 Fans per VFD +
Narrow Width Fan L = Option A + Inlet Backdraft Dampers M = Option B + Inlet
Backdraft Dampers N = Option C + Inlet Backdraft Dampers P = Option D + Inlet
Backdraft Dampers Q = Option E + Inlet Backdraft Dampers R = Option F + Inlet
Backdraft Dampers S = Option G + Inlet Backdraft Dampers T = Option H + Inlet
Backdraft Dampers U = Option J + Inlet Backdraft Dampers V = Option K + Inlet
Backdraft Dampers
20
6C: EXHAUST FAN SIZE 0 = No Exhaust Fan N = 27″ Direct Drive Backward Curved
Plenum
Aluminum Q = 30″ Direct Drive Backward Curved Plenum
Steel R = 33″ Direct Drive Backward Curved Plenum
Steel S = 36.5″ Direct Drive Backward Curved
Plenum Aluminum T = 42.5″ Direct Drive Backward Curved Plenum
Aluminum U = 18.5″ Direct Drive Backwards Airfoil Aluminum V = 22″ Direct
Drive Backwards Airfoil Aluminum W = 24″ Direct Drive Backwards Airfoil
Aluminum Y = 27″ Direct Drive Backwards Airfoil Aluminum
6D: EXHAUST FAN MOTOR TYPE 0 = No Exhaust Fan A = High Efficiency Open Motor
(1170 nominal
rpm) B = High Efficiency Open Motor (1760 nominal
rpm) L = High Efficiency Totally Enclosed Motor (1170
nominal rpm) M = High Efficiency Totally Enclosed Motor (1760
nominal rpm) P = Permanent Magnet AC Totally Enclosed Motor
(1170 nominal rpm) Q = Permanent Magnet AC Totally Enclosed Motor
(1760 nominal rpm)
6E: EXHAUST MOTOR SIZE 0 = No Exhaust Fan H = 3 hp J = 5 hp K = 7.5 hp L = 10
hp M = 15 hp N = 20 hp P = 25 hp Q = 30 hp R = 40 hp
RZ Series Feature String Nomenclature
9 D
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
8
7
5 E 2 5
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 D
3 C
3 B
16D 3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZE
2
1
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 -M0 – C – 0 0 0 – 8 0 – DA0 B – 0 0 – 0 0 0 – ABEQ0 A – E 0 0 0 0 0 – 0 0 0 0 0DB
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
7: O/A CONTROL 0 = Standard (No Actuator) C = Fully Modulating Actuator –
Sensible Limit D = Fully Modulating Actuator – Enthalpy Limit E = DDC Actuator
P = Option C + CO2 Override Q = Option D + CO2 Override R = Option E + CO2
Override U = 2 Position Actuator V = Fault Detection and Diagnostics
Controller
(FDD) Sensible Limit W = FDD Enthalpy Limit Y = Option V + CO2 Override Z =
Option W + CO2 Override
8: RETURN & EXHAUST OPTIONS 0 = No Return Opening A = Standard Return Opening
without EA Dampers B = Large Return Opening without EA Dampers E = Standard
Return Opening + Motorized EA
Dampers F = Large Return Opening + Motorized EA Dampers
Feature 9: FILTER OPTIONS 9A: UNIT FILTER TYPE 0 = 2″ Pleated MERV 8 A = 4″
Pleated MERV 8 B = 2″ Pleated MERV 8 + 4″ Pleated MERV 11 C = 2″ Pleated MERV
8 + 4″ Pleated MERV 13 D = 2″ Pleated MERV 8 + 4″ Pleated MERV 14 E = 4″
Pleated MERV 8 + 4″ Pleated MERV 11 F = 4″ Pleated MERV 8 + 4″ Pleated MERV 13
G = 4″ Pleated MERV 8 + 4″ Pleated MERV 14 H = 2″ Pleated MERV 8 + 12″
Cartridge MERV 11 J = 2″ Pleated MERV 8 + 12″ Cartridge MERV 13 K = 2″ Pleated
MERV 8 + 12″ Cartridge MERV 14 L = 4″ Pleated MERV 8 + 12″ Cartridge MERV 11 M
= 4″ Pleated MERV 8 + 12″ Cartridge MERV 13 N = 4″ Pleated MERV 8 + 12″
Cartridge MERV 14 P = 2″ Pleated MERV 8 + 30″ Bag MERV 13 Q = 2″ Pleated MERV
8 + 30″ Bag MERV 14
9A: UNIT FILTER TYPE Continued R = 4″ Pleated MERV 8 + 30″ Bag MERV 13 S = 4″
Pleated MERV 8 + 30″ Bag MERV 14 W = 4″ MERV 8 + 12″ 99.97 HEPA
9B: UNIT FILTER BOX SIZE/LOCATION 0 = Standard Filters in Standard Position A
= Standard Filters in Pre-position B = High Eff Filters Box A in Standard
Position C = High Eff Filters Box B in Standard Position D = High Eff Filters
Box C in Standard Position E = High Eff Filters Box A in Pre-Position F = High
Eff Filters Box B in Pre-Position G = High Eff Filters Box C in Pre-Position H
= Dual Angled Filter Racks Box A in Standard
Position J = Dual Angled Filter Racks Box B in Standard
Position K = Dual Angled Filter Racks Box A in Pre-Position L = Dual Angled
Filter Racks Box B in Pre-Position N = HEPA Filters Box A in Standard Position
P = HEPA Filters Box B in Standard Position Q = HEPA Filters Box A in Pre-
position R = HEPA Filters Box B in Pre-position
9C: FINAL FILTER TYPE 0 = No Final Filters A = 12″ Cartridge MERV 13–Filter
Box A B = 12″ Cartridge MERV 13–Filter Box B C = 12″ Cartridge MERV 13–Filter
Box C D = 12″ Cartridge MERV 14–Filter Box A E = 12″ Cartridge MERV 14–Filter
Box B F = 12″ Cartridge MERV 14–Filter Box C G = 30″ Bag MERV 13–Filter Box A
H = 30″ Bag MERV 13–Filter Box B J = 30″ Bag MERV 13–Filter Box C K = 30″ Bag
MERV 14–Filter Box A L = 30″ Bag MERV 14–Filter Box B M = 30″ Bag MERV
14–Filter Box C N = HEPA Frame (No Filter)–Filter Box A
21
RZ Series Feature String Nomenclature
9 D
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
5 E
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 D
3 C
3 B
8
7
16D 3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZE
2
1
3 7
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 -M0 – C – 0 0 0 – 8 0 – D A 0 B – 0 0 – 0 0 0 – A B E Q 0 A – E 0 0 0 0 0 – 0 0 0 0 0 D B
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
9C: FINAL FILTER TYPE (continued)
P = HEPA Frame (No Filter)–Filter Box B Q = 12″ 99.97 HEPA–Filter Box A R =
12″ 99.97 HEPA–Filter Box B S = 4″ MERV 8 + 12″ 99.97 HEPA–Filter Box A T = 4″
MERV 8 + 12″ 99.97 HEPA–Filter Box B
9D: FILTER OPTIONS 0 = None A = Clogged Filter Switch – Unit Filters B =
Clogged Filter Switch – Unit + Energy Recovery
Filters C = Clogged Filter Switch – Unit + Final Filters D = Clogged Filter
Switch – Unit + Energy Recovery
+ Final Filters E = Magnehelic Gauge – Unit Filters F = Magnehelic Gauge –
Unit + Energy Recovery
Filters G = Magnehelic Gauge – Unit + Final Filters H = Magnehelic Gauge –
Unit + Energy Recovery +
Final Filters J = CFS + Magnehelic Gauge – Unit Filters K = CFS + Magnehelic
Gauge – Unit + Energy
Recovery Filters L = CFS + Magnehelic Gauge – Unit + Final Filters M = CFS +
Magnehelic Gauge – Unit + Energy
Recovery + Final Filters
Feature 10: REFRIGERATION CONTROL
10A: REFRIGERATION CONTROL A 0 = Standard E = Freeze Stats (each circuit)
10B: REFRIGERATION CONTROL B 0 = Standard
Feature 11: REFRIGERATION OPTIONS
11A: REFRIGERATION OPTIONS A 0 = Standard D = Hot Gas Bypass Non-Variable
Compressor Circuits (HGBNV) E = Modulating Hot Gas Reheat [MHGR] M = HGBNV +
MHGR Q = Polymer E-Coated MHGR W = HGBNV + Polymer E-Coated MHGR
11B: REFRIGERATION OPTIONS B 0 = Standard
12: REFRIGERATION ACCESSORIES 0 = Standard B = Compressor Isolation Valves C =
Sight Glass + Compressor Isolation Valves
F = Option B + Variable Circuits -20°F Low Ambient [Size 075 & Series B, C,D,
E] F = Option B + Lead Circuit -20°F Low Ambient [Size 045, 055, & 065] G =
Option C + Variable Circuits -20°F Low Ambient [Size 075 & Series B, C, D, E]
G = Option C + Lead Circuit -20°F Low Ambient [Size 045, 055, & 065] K =
Option B + Tandem Circuits -20°F Low Ambient [Size 075 & Series B, C, D, E] K
= Option B + Lag Circuit -20°F Low Ambient [Size 045, 055, & 065] L = Option C
- Tandem Circuits -20°F Low Ambient [Size 075 & Series B, C, D, E] L = Option C + Lag Circuit -20°F Low Ambient [Size 045, 055, & 065] P = Option B + All Circuits -20°F Low Ambient Q = Option C + All Circuits -20°F Low Ambient
22
GEN MJREV SIZE SERIES MNREV VLT A 1 A 2 A 3 A 4 A 5 B 1 B 2 B 3 B 4 B 5 1 2 3 A 3 B 3 C 3 D 3 E 4 A 4 B 4 C 5 A 5 B 5 C 5 D 5 E 6 A 6 B 6 C 6 D 6 E 7 8 9 A 9 B 9 C 9 D
10A 10B 11A 11B
1 2 13A 13B 13C
1 4 1 5 16A 16B 16C 16D 17A 17B 18A 18B 18C 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2
7 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7
RZ Series Feature String Nomenclature
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 – M0 – C – 0 0 0 – 8 0 – DA0 B – 0 0 – 0 0 0 – ABEQ 0 A – E 0 0 0 0 0 – 0 0 0 0 0 DB
Feature 13: POWER OPTIONS
13A: UNIT DISCONNECT TYPE
0 = Single Point Power – Standard Power
Block
A = Single Point Power – Non-fused
Disconnect Power Switch
B = Single Point Power – Non-fused
Disconnect Power Switch
C = Dual Point Power Standard Power Block Method #1 D = Dual Point Power
Non-Fused Disconnect Power Switch Method #1 E = Dual Point Power Circuit
Breaker Method #1
F = Dual Point Power Standard Power Block Method #2 G = Dual Point Power
Non-Fused Disconnect Power Switch Method #2 H = Dual Point Power Circuit
Breaker Method #2
J = Dual Point Power Standard Power Block Method #3 K = Dual Point Power
Non-Fused Disconnect Power Switch Method #3 L = Dual Point Power Circuit
Breaker Method #3
M = Dual Point Power Standard Power Block Method #4 N = Dual Point Power
Non-Fused Disconnect Power Switch Method #1 P = Dual Point Power Circuit
Breaker Method #1
13B: DISCONNECT 1 SIZE / 13C: DISCONNECT 2 SIZE 0 = Power Block A = 15 amps B = 20 amps C = 25 amps D = 30 amps E = 35 amps F = 40 amps G = 45 amps H = 50 amps J = 60 amps K = 70 amps L = 80 amps M = 90 amps N = 100 amps P = 110 amps Q = 125 amps R = 150 amps S = 175 amps T = 200 amps U = 225 amps V = 250 amps W = 300 amps Y = 350 amps Z = 400 amps 1 = 450 amps 2 = 500 amps 3 = 600 amps 4 = 700 amps 5 = 800 amps 6 = 1000 amps 7 = 1200 amps
23
RZ Series Feature String Nomenclature
GEN MJREV SIZE SERIES MNREV VLT A 1 A 2 A 3 A 4 A 5 B 1 B 2 B 3 B 4 B 5 1 2 3 A 3 B 3 C 3 D 3 E 4 A 4 B 4 C 5 A 5 B 5 C 5 D 5 E 6 A 6 B 6 C 6 D 6 E 7 8 9 A 9 B 9 C 9 D
10A 10B 11A 11B
1 2 13A 13B 13C
1 4 1 5 16A 16B 16C 16D 17A 17B 18A 18B 18C 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2
7 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 – M 0 – C – 0 0 0 – 8 0 – DA0 B – 0 0 – 0 0 0 – A B E Q 0 A – E 0 0 0 0 0 – 0 0 0 0 0 DB
14: SAFETY OPTIONS
0 = Standard A = RA & SA Firestat B = RA Smoke Detector C = SA Smoke Detector
D = High Supply Air Static Pressure Switch E = Remote Safety Shutdown
Terminals F = Option A + B G = Option A + C H = Option A + D J = Option A + E
K = Option B + C L = Option B + D M = Option B + E N = Option C + D P = Option
C + E Q = Option D + E R = Option A + B + C S = Option A + B + D T = Option A
- B + E U = Option A + C + D V = Option A + C + E W = Option A + D + E Y =
Option B + C + D Z = Option B + C + E 1 = Option B + D + E 2 = Option C + D +
E 3 = Option A + B + C + D 4 = Option A + B + C + E 5 = Option A + B + D + E 6
= Option A + C + D + E 7 = Option B + C + D + E 8 = Option A + B + C + D + E
15: ELECTRICAL ACCESSORIES
0 = Standard B = Phase & Brown Out Protection C = Air Disinfection UV Lights E = Compressor Sound Blankets K = Option B + C M = Option B + E P = Option C + E Z = Option B + C + E
24
Feature 16: UNIT CONTROLS 16A: CONTROL SEQUENCE 0 = Standard Terminal Block
for Thermostat A = Terminal Block for Thermostat + Isolation
Relays B = Single Zone VAV Unit Controller – VAV
Cool + CAV Heat C = Single Zone VAV Unit Controller – VAV
Cool + VAV Heat D = VAV Unit Controller – VAV Cool + CAV Heat E = Constant Air
Volume Unit Controller – CAV
Cool + CAV Heat F = Makeup Air Unit Controller M = Field Installed DDC
Controls by Others N = Field Installed DDC Controls + Isolation Relays P =
Factory Installed DDC Controls by Others + Isolation Relays Q = DX-DOAS
Controls
16B: CONTROL SUPPLIER 0 = Standard A = AAON Controls C = AAON Controls
Supervisory
16C: CONTROL SUPPLIER OPTIONS 0 = Standard
16D: BMS CONNECTION & DIAGNOSTICS 0 = None B = BACnet MSTP K = BACnet MSTP
with Diagnostics
RZ Series Feature String Nomenclature
9 D
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
8
7
5 E 2 5
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 C 3 D
3 B
16D 3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZE
2
1
3 7
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 – M0 – C – 0 0 0 – 8 0 – DA0 B – 0 0 – 0 0 0 – ABEQ 0 A – E 0 0 0 0 0 – 0 0 0 0 0 DB
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
Feature 17: PREHEAT OPTIONS
17A: PREHEAT CONFIGURATION 0 = No Preheat F = Hot Water Coil Preheat in Option
Box G = Steam Distributing Coil Preheat in Option Box M = Polymer Coated Hot
Water Coil Preheat in
Option Box N = Polymer Coated Steam Distributing Coil Preheat
in Option Box P = Direct Fired Heat 100% OA Nat Gas (CAV)
17B: PREHEAT SIZING 0 = No Preheat
Hot Water Preheat Coil [17A = F, M] A = Size A 1 Row Half Serpentine 10 FPI B
= Size B 1 Row Half Serpentine 10 FPI C = Size C 1 Row Half Serpentine 10 FPI
D = Size D 1 Row Half Serpentine 10 FPI E = Size A 1 Row Quarter Serpentine 10
FPI F = Size B 1 Row Quarter Serpentine 10 FPI G = Size C 1 Row Quarter
Serpentine 10 FPI H = Size D 1 Row Quarter Serpentine 10 FPI J = Size A 2 Row
Full Serpentine 10 FPI K = Size B 2 Row Full Serpentine 10 FPI L = Size C 2
Row Full Serpentine 10 FPI M = Size D 2 Row Full Serpentine 10 FPI N = Size A
2 Row Half Serpentine 10 FPI P = Size B 2 Row Half Serpentine 10 FPI Q = Size
C 2 Row Half Serpentine 10 FPI R = Size D 2 Row Half Serpentine 10 FPI
Steam Distributing Preheat Coil [17A = G, N] A = Size A 1 Row Full Serpentine
10 FPI B = Size B 1 Row Full Serpentine 10 FPI C = Size C 1 Row Full
Serpentine 10 FPI D = Size D 1 Row Full Serpentine 10 FPI J = Size A 2 Row
Full Serpentine 10 FPI K = Size B 2 Row Full Serpentine 10 FPI L = Size C 2
Row Full Serpentine 10 FPI M = Size D 2 Row Full Serpentine 10 FPI
Direct Fired Heat [17A = P] A = 1′ Burner B = 1.5′ Burner C = 2′ Burner D =
2.5′ Burner E = 3′ Burner F = 4′ Burner G = 4.5′ Burner H = 5.5′ Burner J = 6′
Burner K = 7′ Burner L = 7.5′ Burner M = 8.5′ Burner
Feature 18: OPTION BOXES
18A: BOX LOCATION 0 = No Option Box A = One Option Box after Return B = One
Option Box after Pre-Filter C = One Option Box after Cooling D = One Option
Box after Supply Fan E = One Option Box after Heat F = One Option Box after
Return + One after Pre- Filter G = One Option Box after Return + One after
Cooling H = One Option Box after Return + One after Supply Fan J = One Option
Box after Return + One after Heat K = One Option Box after Pre-Filter + One
after Cooling L = One Option Box after Pre-Filter + One after Supply
Fan M = One Option Box after Pre-Filter + One after Heat N = One Option Box
after Cooling + One after Supply
Fan P = One Option Box after Cooling + One after Heat Q = One Option Box after
Supply Fan + One after Heat R = No Option Box S = 2 ft First Box T = 2 ft
First Box + 2ft Second Box U = 2 ft First Box + 4ft Second Box V = 2 ft First
Box + 6ft Second Box W = 2 ft First Box + 8ft Second Box Y = 2 ft First Box +
8ft Second Box
25
RZ Series Feature String Nomenclature
GEN MJREV SIZE SERIES MNREV VLT A 1 A 2 A 3 A 4 A 5 B 1 B 2 B 3 B 4 B 5 1 2 3 A 3 B 3 C 3 D 3 E 4 A 4 B 4 C 5 A 5 B 5 C 5 D 5 E 6 A 6 B 6 C 6 D 6 E 7 8 9 A 9 B 9 C 9 D
10A 10B 11A 11B
1 2 13A 13B 13C
1 4 1 5 16A 16B 16C 16D 17A 17B 18A 18B 18C 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2
7 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 – M0 – C – 0 0 0 – 8 0 – D A 0 B – 0 0 – 0 0 0 – ABE Q 0 A – E 0 0 0 0 0 – 0 0 0 0 0 D B
18A: BOX LOCATION Continued Z = 2 ft First Box + 8ft Second Box 1 = 2 ft First
Box + 8ft Second Box 2 = 2 ft First Box + 8ft Second Box 3 = 2 ft First Box +
8ft Second Box 4 = 2 ft First Box + 8ft Second Box
18B: BOX SIZE 0 = No Option Box A = 2 ft First Box B = 2 ft First Box + 2ft
Second Box C = 2 ft First Box + 4ft Second Box D = 2 ft First Box + 6ft Second
Box E = 2 ft First Box + 8ft Second Box F = 4 ft First Box G = 4 ft First Box
- 2ft Second Box H = 4 ft First Box + 4ft Second Box J = 4 ft First Box + 6ft
Second Box K = 4 ft First Box + 8ft Second Box L = 6 ft First Box M = 6 ft
First Box + 2ft Second Box N = 6 ft First Box + 4ft Second Box P = 6 ft First
Box + 6ft Second Box Q = 6 ft First Box + 8ft Second Box R = 8 ft First Box S
= 8 ft First Box + 2ft Second Box T = 8 ft First Box + 4ft Second Box U = 8 ft
First Box + 6ft Second Box V = 8 ft First Box + 8ft Second Box
26
18C: BOX ACCESSORIES 0 = None A = 20″ Drain Pan in First Box B = 20″ Drain Pan
in First Box + 20″ Drain Pan in
Second Box C = 20″ Drain Pan in First Box + 44″ Drain Pan in
Second Box D = Option A + Sound Attenuator E = 44″ Drain Pan in First Box F =
44″ Drain Pan in First Box + 20″ Drain Pan in
Second Box G = 44″ Drain Pan in First Box + 44″ Drain Pan in
Second Box H = Option E + Sound Attenuator J = Sound Attenuator in First Box K
= Option J + 20″ Dain Pan in Second Box L =Option J + 44″ Drain Pan in Second
Box N = Empty First Box + 20″ Drain Pan in Second Box P = Empty First Box +
44″ Drain Pan in Second Box Q =Empty First Box + Sound Attenuator in Second
Box S = Air Mixer in First Box T = Option S + 20″ Drain Pan in Second Box U
=Option S + 44″ Drain Pan in Second Box V =Option S + Sound Attenuator in
Second Box
19: OUTSIDE AIR ACCESSORIES 0 = No Outside Air Hood 100% Return Air A =
Outside Air Hood B = Outside Air Hood with Metal Mesh Filters C = Outside Air
Hood + Outside Air Flow Measuring Station G = Option B + C
20: CABINET OPTIONS 0 = Standard B = SA & RA Burglar Bars C = SA & RA Walkable
Safety Grates D = Perforated Line for SA Fans E = Perforated Liner for RA Fans
L = Option B + D M = Option B + E Q = Option D +E 1 = Option B + D + E
RZ Series Feature String Nomenclature
9 D
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
5 E
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 D
3 C
3 B
8
7
16D 3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZE
2
1
3 7
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 – M 0 – C – 0 0 0 – 8 0 – D A 0 B – 0 0 – 0 0 0 – A B EQ 0 A – E 0 0 0 0 0 – 0 0 0 0 0 D B
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
21: ACCESSORIES
0 = None B = Motorized Service Vestibule Fresh Air C = Supply Fan Air Flow
Measuring D = Return Fan Air Flow Measuring E = Access Door Windows K = Option
B + C L = Option B + D M = Option B + E N = Option C + D P = Option C + E Q =
Option D + E Y = Option B + C + D Z = Option B + C + E 1 = Option B + D + E 2
= Option C + D + E 7 = Option B + C + D + E
22: MAINTENANCE ACCESSORIES
0 = Standard A = Factory Wired 115V Convenience Outlet B = Field Wired 115V
Convenience Outlet C = Service Lights D = Remote Start/Stop contacts E =
Supply Fan Auxiliary Contacts F = Option A + C G = Option A + D H = Option A +
E J = Option B + C K = Option B + D L = Option B + E M = Option C + D N =
Option C + E P = Option D + E Q = Option A + C + D R = Option A + C + E S =
Option A + D + E T = Option B + C + D U = Option B + C + E V = Option B + D +
E W = Option C + D + E Y = Option A + C + D + E Z = Option B + C + D + E
23: CODE OPTIONS
0 = Standard – ETL U.S.A. Listing A = Chicago Code B = ETL U.S.A. + Canada
Listing
24: SHIPPING SPLITS
0 = Standard A = Two Piece Unit D = Two Piece Unit (Refrigeration Split)
25: AIR COOLED CONDENSER ACESSORIES
0 = Standard E = VFD Condenser Fan Head Pressure Control K = Low Sound
Condenser Fan Head Pressure Control
26: EVAPORATIVE CONDENSER ACESSORIES 0 = No Evaporative Condenser A = No Sump
or Vestibule Heater B = Sump & Vestibule Heaters
27: WATER – COOLED CONDENSER ACCESSORIES 0 = No Water-Cooled Condenser
28: ENERGY RECOVERY WHEEL ACCESSORIES 0 = None A = Energy Recovery Wheel
Defrost Start/Stop B = Energy Recovery Wheel Rotation Detection E =VFD for
Heat Wheel Motor (Field Control) F = Energy Recovery Wheel Defrost Start/Stop
M = Option B + E
29: VFD OPTIONS 0 = None A = Shaft Grounding Kit on all SA, RA, EA Motors C =
BACnet VFD on all Motors G = Option A + C
27
9 D
3 7
RZ Series Feature String Nomenclature
9 C
9 B
9 A
6 E
6 D
6 C
6 B
6 A
5 E
5 D
5 C
5 B
5 A
4 C
4 B
4 A
3 E
3 D
3 C
3 B
8
7
16D 3 A
B 5
B 4
B 3
B 2
B 1
A 5
A 4
A 3
A 2
A 1
VLT
MNREV
SERIES
GEN MJREV SIZE
2
1
RZ A – 145 – D 0 – 3 – C A B 0 A – 0 0 0 0 0 : N 0 – A A K A Q – J 0 0 – B F T 0 M – 0 0 0 0 0 – Q F – A 0 A A – 0 0 – M 0 – C – 0 0 0 – 8 0 – D A 0 B – 0 0 – 0 0 0 – AB EQ 0A – E 0 0 0 0 0 – 0 0 0 0 0 DB
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
1 9
18C
18B
18A
17B
17A
16C
16B
16A
1 5
1 4
13C
13B
13A
1 2
11B
11A
10B
10A
30: MISCELLANEOUS OPTIONS 0 = None A = High Condensate Level Switch S =
Additional Vestibule Heater T = Option A + S
31: BLANK 0 = Standard
32: BLANK 0 = Standard
33: BLANK 0 = Standard
34: BLANK 0 = Standard
35: WARRANTY 0 = Standard Warranty
36: CABINET Material D= Galvanized Cabinet Double Wall + R-13 Foam
Insulation + 6″ Base Rail + Double Sloped Roof
37: SPECIALS & PAINT B = Premium AAON Gray Paint Exterior D = Premium AAON
Gray Paint Exterior + Interior Corrosion Protection G = Premium AAON Gray
Paint Exterior + Interior Corrosion Protection + Shrink Wrap X = SPA + Premium
AAON Gray Paint Exterior Z = SPA + Premium AAON Gray Paint Exterior + Interior
Corrosion Protection 3 = SPA + Premium AAON Gray Paint Exterior + Interior
Corrosion Protection + Shrink Wrap 4 = SPA + Special Exterior Paint Color 6 =
SPA + Special Exterior Paint Color + Interior Corrosion Protection 9 = SPA +
Special Exterior Paint Color + Interior Corrosion Protection + Shrink Wrap
28
General Information
RZ Series packaged rooftop and outdoor air handling units are for outdoor
installation only. A minimum of 12″ high curb is required for installation on
combustible roofs.
WARNING
Improper installation, adjustment, alteration, service or maintenance can
cause property damage, personal injury or loss of life. Startup and service
must be performed by a Factory Trained Service Technician.
CAUTION
These units must not be used for heating or cooling at any time during any
phase of construction. Very low return air temperatures, harmful vapors, and
misplacement of the filters will damage the unit and its efficiency.
Certification of Gas Heat Models a. The RZ Series gas heat exchangers have
been certified as a Category III forced air furnace for use with or without
cooling, located downstream of the indoor coil. b. AAON gas heat exchangers
operate for a minimum of 10,000 cycles. c. Individual RZ Series gas heat
exchangers are designed for 400 MBH and 350 MBH input rates and can be
configured for up to a 4500 MBH total gas input rating (maximum input rates
vary by selected heating feature).
d. Modulating gas heat exchangers are designed for 3:1 turndown of the 320 MBH
input rate available on the first stage of heating.
Certification of Steam or Hot Water Heat Models a. Certified as a forced air
heating system
with or without cooling. b. RZ Series hot water coils are designed for
operation with no more than 82.2°C (180°F) water at a 1034 kpa (150 psig)
working pressure. c. RZ Series steam coils are designed for 1034 kpa (150
psig) working pressure.
Certification of Electric Heat Models a. RZ Series electric warm air furnaces
have
been certified for use with or without cooling, located downstream of the
indoor coil. b. RZ Series electric warm air furnaces are designed with
individual 40 KW electric heating elements that can be configured for up to
240 KW of electric heat (maximum output varies by selected heating features).
c. Modulating electric heat exchangers are equipped with Silicon Control
Rectifiers (SCR) on the first stage of heating.
Certification of Cooling Models a. RZ Series R-410A refrigerant systems have
been certified as commercial central air conditioners with or without
electrically operated compressors. b. RZ Series chilled water coils are
designed for 1034 kpa (150 psig) working pressure.
29
Codes and Ordinances The RZ Series has been tested and certified by Intertek
(ETL) to the following safety standards: ANSI Z21.47-2016/CSA 2.3-2016 Gas-
Fired Central Furnaces
ANSI Z83.8-2016/CSA 2.6-2016 Gas unit heaters, gas packaged heaters, gas
utility heaters and gas-fired duct furnaces
UL 1995/CSA C22.2 No. 236-11 Fifth Edition Heating and Cooling Equipment
UL 60335-2-40 4th Edition 2022
System must be sized in accordance with practices described in the American
Society of Heating, Refrigeration, and Air Conditioning Engineers Handbooks.
AAON equipment must be installed in accordance with this manual and the
International Code Council (ICC) requirements.
Installation of RZ Series units must conform to the International Code Council
(ICC) standards of the International Mechanical Code, the International
Building Code, and local building, plumbing, and waste water codes. In the
absence of local codes installation must conform to current National Fuel Code
ANSI Z223.1/NFPA 54 or the National Gas & Propane Installation Code CSA
B149.1, and CSA B52 Mechanical Refrigeration Code. All appliances must be
electrically grounded in accordance with local codes, or in the absence of
local codes, the National Electric Code, ANSI/NFPA 70, and/or the Canadian
Electrical Code CSA C22.1.
CAUTION
The Clean Air Act of 1990 bans the intentional venting of refrigerant as of
July 1, 1992. Approved methods of recovery, recycling, or reclaiming must 3b0e
followed.
WARNING
Coils and sheet metal surfaces present sharp edges and care must be taken when
working with this equipment.
WARNING
Failure to observe the following instructions will result in premature failure
of your system and possible voiding of the warranty.
Receiving Unit When received, the unit must be checked for damage that might
have occurred in transit. If damage is found, it must be noted on the
carrier’s Freight Bill. A request for inspection by carrier’s agent must be
made in writing at once. Nameplate must be checked to ensure the correct model
sizes and voltages have been received to match the job requirements.
If repairs must be made to damaged goods, notify the factory before any repair
action is taken in order to protect the warranty. Certain equipment
alteration, repair, and manipulation of equipment without the manufacturer’s
consent may void the product warranty. Contact the AAON Warranty Department
for assistance with handling damaged goods, repairs, and freight claims:
918-382-6450.
Note: Upon receipt check shipment for items that ship loose such as filters
and remote sensors. Consult order and shipment documentation to identify
potential looseshipped items. Loose-shipped items may have been placed inside
unit cabinet for security. Installers and owners must secure
29
all doors with locks or nuts and bolts to prevent unauthorized access.
Storage If installation will not occur immediately following delivery, store
equipment in a dry protected area away from construction traffic and in the
proper orientation as marked on the packaging with all internal packaging in
place. Secure all loose-shipped items.
Access Doors Lockable access doors are provided to the services vestibule and
to sections of the unit which may require maintenance or servicing. After
startup is completed, if necessary, use locks to prevent unauthorized access.
A separate access door is also provided to the evaporator and pumping package
compartment. See maintenance section for information on leak checking these
doors.
Figure 1- Lockable Door Handles
Wiring Diagrams Unit specific wiring diagrams are laminated and affixed inside
the controls compartment door.
Installation
AAON equipment is designed to be easily installed and serviced.
Locating Units The curb must be mounted first and must be located so that duct
connections will be clear of structural members of the building.
Verify rooftop or foundation can support the total unit weight, including
accessory weights.
WARNING
When locating gas fired units, the unit shall be installed so that the flue
discharge vents are located at least 305 cm (120 inches) away from any opening
through which combustion products could enter the building.
Do not position flue opening to discharge into a fresh air intake of any other
piece of equipment. Unit must also be installed so that the flow of combustion
intake air is not obstructed from reaching the furnace.
WARNING
Distances from adjacent public walkways, adjacent buildings, operable windows
and building openings, shall conform to local codes and/or the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, or the National Gas & Propane Code, CSA B149.1
Vent opening must not be blocked by snow. A minimum 30.5 cm (12″) curb must be
used or the vent outlet shall be greater than 30.5 cm (12″) off the
ground/roof.
Flue gas is dangerously hot and contains containments. The user is responsible
for
30
determining if vent gases may degrade building materials.
The National Gas and Propane Installation Code, B149.1 specifies a 1.8m (6ft).
horizontal vent terminal clearance to gas and electric meters and relief
devices.
Local codes may supersede or further place restrictions on vent termination
locations.
Table 1 – Air-Cooled Condenser Unit Clearances 45-240 ton
Location
Front (Condenser Side) Back (Outside Air) Left Right Top
Clearance for
45-240 ton units
152cm (60″) 254 cm (100″) 254 cm (100″) 254 cm (100″) Unobstructed
debris that may be drawn in and obstruct airflow in the condensing section.
Consideration must be given to obstruction caused by snow accumulation when
placing the unit.
Curb Installation Make openings in the roof decking large enough to allow for
duct penetrations and workspace only. Do not make openings larger than
necessary. Set the curb to coincide with the openings. Make sure curb is
level. Unit must be level in both horizontal axes to support the unit and
reduce noise and vibration.
Unit specific curb drawing is included with job submittal. See SMACNA
Architectural Sheet Metal Manual and HVAC Duct Construction Standards for curb
installation details.
Left Side
Outside Air
Figure 2 – RZ Series Unit Orientation
Table 2 – Evaporative Condenser Unit
Clearances 45-240 ton
Location
Clearance for
45-240 ton units
Front (Condenser Side) 254 cm (100″)
Back (Outside Air)
254 cm (100″)
Left
254 cm (100″)
Right
254 cm (100″)
Top
Unobstructed
Condenser coils and fans must be free of any
obstructions in order to start and operate
properly with a correct amount of airflow.
For proper unit operation, theimmediate area around the condenser must remain free of
CAUTION
All roofing work must be performed by competent roofing contractors to avoid
any possible leakage.
CAUTION
Where the supply or warm air duct passes through a combustible roof, a
clearance of 2.54cm (1 inch) must be maintained between the outside edges of
the duct and combustible material in accordance with National Fire Protection
Association Standard No. 90A. Provide flashings or enclosure between structure
and roof and all joints must be sealed with mastic roofing to ensure a
watertight seal.
31
For horizontal return and discharge applications, total height of mounting
rail and unit base rail must be high enough so that adequate condensate drain
p-trap can be included. Units require steel mounting rail support along all
four sides of the unit base.
When installed at ground level, a one-piece concrete slab must be used with
footings that extend below the frost line. Care must also be taken to protect
the coil and fins from damage due to vandalism or other causes.
If unit is elevated a field supplied catwalk is recommended to allow access to
unit service doors.
This unit ships with a curb gasket that is 31 ¾ mm ( 1¼”) wide and 38 mm (1½”)
tall. This or another similar gasket must be used between the curb and the
unit to reduce vibration from the unit to the building.
Lifting the Unit
CAUTION
Incorrect lifting can cause damage to the unit.
If cables or chains are used to hoist the unit they must be the same length.
See Figure 4 and Figure 5 for dimensions.
Lift the unit with the outside air hood in the downward shipping position.
However, the unit may be lifted with the outside air hood in the open
position. Before lifting unit, be sure that all shipping material has been
removed from the unit. Secure hooks and cables at all marked lifting points
provided on the unit. Hoist unit to a point directly above the curb and duct
openings. Be sure that the gasket material has been applied to the curb.
Carefully lower and align unit with utility and duct openings. Lower the unit
until the unit skirt fits around the curb. Make sure the unit is properly
seated on the curb and is level.
Figure 3 – Base Rail Lifting Lug
32
Figure 4 – 4 Point Lift RZ Series Air-Cooled Condenser Unit 33
Figure 5 – 8 Point Lift RZ Series Air-Cooled Condenser Unit Lifting slot
locations are unit specific.
Unit must be rigged at all marked lifting points.
34
Duct Connection
Figure 6 – Curb Mounting
Tons
45-140 145-240
Table 3 – Mounting Dimensions
A m (ft) 2.5 (8.3)
3.6 (11.8)
B m (ft) 2.4 (8.0)
3.5 (11.5)
C m (ft) 2.3 (7.7)
3.4 (11.2)
Figure 7 – Curb Detail
D m (ft) 2.5 (8.1) 3.5 (11.6)
Figure 8 – Curb & Steel Mounting Rail with Dimensions 35
Reassembling Split Units Some RZ Series units are built and shipped in two
separate sections.
Shipping covers must be removed from the ends where the sections will connect.
Lift and set the largest section first, checking for the correct location and
position.
In order to simplify the connection of the two sections, it is important to
position and set the second section as close as possible to the first section.
This will allow the use of a comealong tool, to pull the second section
against the first section. One come-along tool is required on each side of the
unit, connected at the base slots. The two sections must be tightly adjoined
before the splicing parts can be installed.
All parts required for splicing the sections together are factory provided.
Neoprene gasket is provided to be applied on ends of both sections.
Once the unit is completely assembled, it is important to visually inspect all
exposed areas and fill any gaps with butyl caulking.
Splicing 1. Align base rail and side sections. 2. Check roof alignment and
connecting flange. 3. Fill post seam with butyl caulking. Apply butyl caulking
between roof flange sections. 4. Attach splice plate to outside of post to
cover seam. Splice plate is typically required on both sides of the unit. 5.
Install factory provided roof splice cap over the two sections connecting
flange and secure with screws along the length of the cap.
36
6. Apply butyl caulking to all seams and perimeter of splice and to the
perimeter of the roof splice cap against the roof of the unit.
Figure 9 – Unit Base and Sides
CAUTION
Attach splice cap with screws from each side of the cap only. Do not install
screws from the top.
Figure 10 – Unit Roof Flange Splice Detail
Refrigeration Split Installation Procedure If a given unit is too large to be
shipped on one truck bed, the unit must be split. If the condenser side of the
split is too long, a split is required in the refrigeration system. Each side
of the split will have isolation valves; one isolation valve is connected to
the condenser side, while the other is connected to the evaporator side. Keep
these isolation valves closed until the following assembly procedure is
complete.
Caution, the refrigeration lines between the isolation valve and cap at the
unit split are charged with 689.5 kpa (100 psi) of nitrogen.
1. Relieve the pressure in the refrigeration split that is charged with
nitrogen by attaching a gauge manifold set and purging through the hoses.
2. Next remove the copper caps on each side by using a pipe cutter at the
brazed joint (Joint A and B).
3. Then braze the provided copper lines onto their respective open lines.
4. After the lines are joined, charge the newly joined section with 1.28 Mpa
(200 psi) of dry nitrogen. Test the charge for an hour. After one hour and no
pressure loss, relieve the pressure by removing the Schrader core. Replace
Schrader core once all pressure is relieved.
5. Next evacuate out each section of connection piping from valve to valve to
400 microns. The micron gauge must not rise above 500 microns after 30 minutes
of wait time.
6. Finally open the isolation valves. The unit is shipped with the correct
refrigerant charge.
Figure 11 – Staggered assembly for refrigeration pipes
37
Electrical Connection of Split Units Before attempting to make wire
connections between sections it is important to refer to the unit specific
wiring diagram located in the unit controls compartment to obtain additional
details related to the wiring of the specific unit.
Adjoining sections are factory wired and ready for field connection. The
electrical wiring is unit specific and designed according to the overall unit
configuration.
A factory supplied and mounted terminal block is located in the main section
of the unit that must be used in making the rough-in wire connections.
Each wire being spliced from section to section is tagged at both ends
according to its termination. Junctions for wiring the sections together are
separated according to voltage.
CAUTION
All wire terminations MUST BE made before applying power to the unit. The unit
will not operate unless all circuits are made.
Outside Air Rain Hood For proper unit operation, the outside air hood must be
opened at start-up as shown in Figure 12.
Locate the middle support for the outside air rain hood inside of the unit and
remove shipping screws from each side of the closed hood.
Lift hood outward to the open position and secure with sheet metal screws.
Then place the middle support connecting the middle of
the hood to the unit and secure with sheet metal screws. Apply butyl caulking
along the top and both sides of the rain hood. Take care to seal the top
corners where the rain hood attaches to the unit. Outdoor air intake
adjustments must be made according to building ventilation or local code
requirements.
Air hoods vary according to unit size and options. Figure 12 below is shown as
a practical guideline for all outside air rain hoods.
Figure 12 – Air Hood Shown in the Open Position
End Flashing Installation On RZ Series D and E cabinet units which are 360.7
cm (142″) wide (RZ-145, 160, 180, 200, 220, 240) the cabinet width will
overhang the trailer on each side.
In order to secure and protect the unit during transit the sheet metal end
flashings have been removed from the unit. The slot created at the base of
each end of the unit allows the unit to set firmly on the trailer deck.
Sheet metal flashings are shipped loose with the unit and once the unit is set
into place the flashings must be installed on each end of the unit to complete
the finished seal at the base. The flashings are unit specific and designed to
cover the slot at each end of the unit to prevent water run-off into the curb.
38
Failure to attach and seal the end of unit with the flashings will result in
water leakage into the curb.
Figure 13 – Factory Supplied End Flashings
CAUTION
In order to prevent water leakage into the roof curb, the factory provided
sheet metal flashings MUST BE attached to the unit base to cover the shipping
slots at both ends of the unit.
Motorized Exhaust & Rain Hood Narrow (254 cm [100″]) The motorized exhaust
damper and rain hood ships inside of the return air section. For proper unit
operation, the motorized exhaust damper must be installed in the field. Once
the motorized exhaust is screwed into place and has been sealed with butyl
caulking, attach a rain hood above the motorized exhaust. Upon screwing the
rain hood into place over the motorized exhaust, apply a seal of butyl
caulking around the edges of the rain hood.
Wide (360 cm [142″]) The RZ unit will arrive with the motorized exhaust
already in place. The rain hood ships inside of the return air section and
must be field installed. After screwing the rain hood over the motorized
exhaust with sheet metal screws, apply a sealant of butyl caulking.
Vestibule Exhaust Fan Prior to unit operation of units with service vestibules
the exhaust fan shipping support must be removed from the exterior of the
unit.
The exhaust fan also includes a factory provide exterior rain hood which must
be installed.
Figure 15 – Motorized Exhaust
Figure 14 – Vestibule Exhaust Fan 39
Electrical Verify the unit nameplate agrees with power supply. Connect power and control field wiring as shown on the unit specific wiring diagram provided laminated and attached to the door in the controls compartment.
Table 4 – Nameplate Voltage Markings & Tolerances
Hz
Nameplate Voltage
Nominal System Voltage
Operating Voltage Range 1
Min
Max
Acceptable Performance Range2
Min
Max
115
120
104
127
108
126
208/230
208/240
187
254
187
252
208
208
187
228
187
228
60
230
240
208
254
216
252
265
277
240
293
249
291
460
480
416
508
432
504
575
600
520
635
540
630
230
230
50
400
400
198
254
208
254
344
440
360
440
Notes: 1. Operating voltage is the min and max voltage for which the unit can function. Never operate outside of this min and max voltage. 2. The Acceptable Performance Range is the min and max voltage for which the unit performance is designed and rated to give acceptable performance.
Route power and control wiring, separately, through the utility entry in the
base of the unit. Do not run power and signal wires in the same conduit.
WARNING
Electric shock hazard. Before attempting to perform any installation, service,
or maintenance, shut off all electrical power to the unit at the disconnect
switches. Unit may have multiple power supplies. Failure to disconnect power
could result in dangerous operation, serious injury, death or property damage.
Size supply conductors based on the unit MCA rating. Supply conductors must be
rated a minimum of 75°C (167°F).
Protect the branch circuit in accordance with code requirements. The unit must
be electrically grounded in accordance with local codes, or in the absence of
local codes, the current National Electric Code, ANSI/NFPA 70 or the current
Canadian Electrical Code CSA C22.1.
CAUTION
Proper sealing of the electrical and gas entries into the unit must be
performed. Failure to seal the entries may result in damage to the unit and
property
40
Note: All units are factory wired for 208/230V, 460V, or 575V. If unit is to
be connected to a 208V supply, the transformer must be rewired to 208V
service. For 208V service interchange the yellow and red conductor on the low
voltage control transformer. Red-Black for 208V Yellow-Black for 230V Wire
power leads to the unit’s power block or main disconnect. All wiring beyond
this point has completed by the manufacturer and cannot be modified without
affecting the unit’s agency/safety certification.
Figure 16 – Power Block Supply voltage must be within the min/max range shown
on the unit nameplate. Available short circuit current must not exceed the
short circuit current rating (SCCR) shown on the unit nameplate.
CAUTION
Three phase voltage imbalance will cause motor overheating and premature
failure.
Three phase voltage imbalance will cause motor overheating and premature
failure. The maximum allowable imbalance is 2%.
Voltage imbalance is defined as 100 times the maximum deviation from the
average voltage divided by the average voltage. Example: (221V+230V+227V)/3 =
226V, then 100*(226V-221V)/226V = 2.2%, which exceeds the allowable imbalance.
Check voltage imbalance at the unit disconnect switch and at the compressor
terminal. Contact your local power company for line voltage corrections.
Installing contractor must check for proper motor rotation and check blower
motor amperage listed on the motor nameplate is not exceeded. Motor overload
protection may be a function of the variable frequency drive and must not be
bypassed.
CAUTION
Rotation must be checked on all MOTORS AND COMPRESSORS of three phase units.
Supply fan, exhaust fan, return fan, and condenser fan motors must all be
checked by a qualified service technician at startup and any wiring alteration
must only be made at the unit power connection.
Variable frequency drives are programmed to automatically rotate the fan in
the correct rotation. Do not rely on fans with variable frequency drives for
compressor rotation.
Wire control signals to the unit’s low voltage terminal block located in the
controls compartment.
41
CAUTION
Scroll compressors are directional and will be damaged by operation in the
wrong direction. Low pressure switches on compressors have been disconnected
after factory testing. Rotation must be checked by a qualified service
technician at startup using suction and discharge pressure gauges and any
wiring alteration must only be made at the unit power connection.
Variable Speed Compressors Variable speed compressors with VFD speed control
are standard on RZ Series units. Variable speed compressors must not be
operated below 50 Hz.
Fuses and Circuit Breakers The interrupting rating of fuses and circuit breakers is to be determined based on the KAIC rating of the unit. Refer to the wiring diagram for fuse sizing.
Table 5 35 KAIC Fuse Sizing
35 KAIC Construction
Component
Description
Interrupting Rating (kA)
Fuse
Class CC, 600V, 0.5A – 30A
200
Fuse
Class J, 600V, 35A – 600A
200
Disconnect
3P, 600V, 15A 600A
35
Table 6 35 KAIC Fuse Sizing
65 KAIC Construction
Component
Description
Interrupting Rating (kA)
Fuse
Class CC, 600V, 0.5A – 30A
200
Fuse
Class J, 600V, 35A – 600A
200
Disconnect
3P, 600V, 15A – 600A
65
42
CAUTION
Unit must not be operated without a ptrap. Failure to install a p-trap may
result in overflow of condensate water into the unit.
CAUTION
No variable speed compressor shall operate below 50 Hz. Operating variable
speed compressors outside the frequency range specified in this manual voids
all warranties and may result in compressor failure.
Condensate Drain Piping Unit is equipped with 2 or more condensate drain pan
connections. A drain line with ptrap must be installed on every drain
connection, with the p-trap not to exceed 15.2 cm (6″) from the drain
connection. The lines must be the same pipe size or larger than the drain
connection and pitched away from the unit at least 1/8 inch per foot. An air
break must be used with long runs of condensate lines.
All drain connections must be used and individually trapped to ensure a
minimum amount of condensate accumulation in the drain pans. ABS type cement
must be used to join the drain pipe connections.
Note: The drain pan connections are 38 mm (1.5″) MPT fitting.
Condensate drain trapping and piping must conform to all applicable governing
codes. Drainage of condensate directly onto the roof may be acceptable in
certain areas, refer to local codes. If condensate is to drain directly onto
the roof a drip pad must be placed below the drain to protect the roof from
possible damage.
Draw-through cooling coils will have a negative static pressure in the drain
pan area. This will cause an un-trapped drain to back up due to air being
pulled up through the condensate drain piping.
Blow-through coils will have a positive static pressure in the drain pan. The
condensate piping on these drain pans must be trapped to prevent pressure loss
through the drain.
Draw-Through Coils
Figure 17 – Draw-Through Drain Trap
The X dimension on the draw-through trap must be at least equal to the
absolute value of the negative static pressure in the drain pan plus one inch.
To calculate the static pressure at the drain pan add the pressure drops of
all components upstream of the drain pan, including the cooling coil, and add
the return duct static pressure. Include the dirt allowance pressure drop for
the filters to account for the worst-case scenario.
The height from top of the bottom bend of the trap to the bottom of the
leaving pipe must be at least equal to one half of the X dimension. This
ensures that enough water is stored in the trap to prevent losing the drain
seal during unit startup
Note: The absolute value of the fan inlet pressure will always be greater than
or equal to the absolute value of the static pressure in the drain pan on
draw-through units, so the
CAUTION
All condensate drain connection must be used. Drain pans are sloped towards
connections.
CAUTION
All condensate drains must be trapped individually before they are connected to a common line.
fan inlet pressure is a safe value to use for the drain pan static pressure.
Table 7 – Draw-Through Drain Trap Dimensions (Metric)
Draw-Through
Drain Pan Pressure
Trap Dimensions
Negative Static
X
X/2
(mmHg)
(millimeters) (millimeters)
-0.93
38.1
19.1
-1.87
50.8
25.4
-2.80
63.5
31.8
-3.74
76.2
38.1
-4.67
88.9
44.5
-5.60
101.6
50.8
-6.54
114.3
57.2
-7.47
127
63.5
-8.41
139.7
69.9
-9.34
152.4
76.2
-10.28
165.1
82.6
-11.21
177.8
88.9
-12.14
190.5
95.3
-13.08
203.2
101.6
-14.01
215.9
108.0
-14.95
228.6
114.3
43
Table 8 – Draw-Through Drain Trap Dimensions (Imperial)
Draw-Through
Drain Pan Pressure
Trap Dimensions
Negative Static
X
X/2
(inches of water)
(inch)
(inch)
-0.50
1.50
0.75
-1.00
2.00
1.00
-1.50
2.50
1.25
-2.00
3.00
1.50
-2.50
3.50
1.75
-3.00
4.00
2.00
-3.50
4.50
2.25
-4.00
5.00
2.50
-4.50
5.50
2.75
-5.00
6.00
3.00
-5.50
6.50
3.25
-6.00
7.00
3.50
-6.50
7.50
3.75
-7.00
8.00
4.00
-7.50
8.50
4.25
-8.00
9.00
4.50
Blow-Through Coils The Y dimension of blow-through traps must be at least equal to the value of the positive pressure in the drain pan plus one inch. This ensures that there will be enough water stored in the trap to counter the static pressure in the drain pan. To find the pressure subtract any pressure drops between the drain pan and the supply fan from the fan discharge pressure. The worst-case scenario for blow-through coils is the minimum pressure drop, so do not include dirt allowance pressure drops for filters.
The bottom of the leaving pipe must be at least one half inch lower than the
bottom of the drain pan connection. This ensures proper drainage when the unit
is not running.
Note: It may be necessary to fill the trap manually, or the trap can be filled
automatically by operating the unit until enough condensate collects to fill
the trap. The trap will then be filled when the unit is turned off.
Table 9 – Blow-Through Drain Trap Dimensions (Metric)
Blow-Through
Drain Pan Pressure
Trap Dimension
Positive Static
Y
(mmHg)
(millimeters)
0.93
38.1
1.87
50.8
2.80
63.5
3.74
76.2
4.67
88.9
5.60
101.6
6.54
114.3
7.47
127.0
8.41
139.7
9.34
152.4
10.28
165.1
11.21
177.8
12.14
190.5
13.08
203.2
14.01
215.9
14.95
228.6
Figure 18 – Blow-Through Drain Trap 44
Table 10 – Blow-Through Drain Trap Dimensions (Imperial)
Blow-Through
Drain Pan Pressure
Trap Dimension
Positive Static
Y
(inches of water)
(inch)
0.5
1.5
1.0
2.0
1.5
2.5
2.0
3.0
2.5
3.5
3.0
4.0
3.5
4.5
4.0
5.0
4.5
5.5
5.0
6.0
5.5
6.5
6.0
7.0
6.5
7.5
7.0
8.0
7.5
8.5
8.0
9.0
Startup (See back of the manual for startup form)
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Startup and service must be performed by a Factory Trained Service Technician.
WARNING
Electric shock hazard. Shut off all electrical power to the unit to avoid
shock hazard or injury from rotating parts.
During startup, it is necessary to perform routine checks on the performance
of the unit. This includes checking the air flow, air filters, condenser water
flow, dampers, heaters, and refrigerant charge.
Filters Do not operate the unit without filters in place. Unit must be checked
for correct filter placement during startup. Operation of the equipment
without filters will result in clogged cooling and heating coils.
Figure 19 – Top Clip and Side Spring Fastener Securing Filters in Place
CAUTION
Before completing startup and leaving the unit a complete operating cycle must
be observed to verify that all components are functioning properly.
Cartridge Filter Installation Cartridge filters may be held in their proper
orientation and placement with channels, spring fasteners, or clips (see
Figure 19).
HEPA Filters HEPA filters can be selected in the Pre, Standard, and Final
filter position. HEPA filters are a highly effective filter. HEPA filters
require field certification.
HEPA filters can be installed in the same way as cartridge filters. Place the
filter on the holding frame and then hold the filter in place by the swing
bolt assembly on the sides. If the unit includes HEPA pre-filters, an adapter
frame is included. The adapter frame holds the HEPA filters and the swing
bolts attach to the adapter frame.
Metal Mesh Filters Metal mesh filters are washable expanded aluminum mesh
filters that are mounted over the outside air intake. These filters are
normally located on the outside air hood. These filters are commonly used to
prevent moisture carryover from the outside. An access panel is provided to
slide out the filters for cleaning.
45
Airflow Balancing and Checking High performance systems commonly have complex
air distribution and fan systems. Unqualified personnel must not attempt to
adjust fan operation, or air circulation, as all systems have unique
operations characteristics. Professional air balance specialists must be
employed to establish actual operating conditions, and to configure the air
delivery system for optimal performance.
Air Flow Monitoring Some units include an air flow monitoring device. Air flow
can be measured either at the outside air opening, supply fans and/or return
fans. Outside air uses a measuring grid and the fans use a piezo ring on their
inlets to collect this information. A singular processor located in the
vestibule handles all of these different readings.
Supply, Return, and Exhaust Backward Curved Fans RZ Series units are equipped
with direct drive backward curved fan assemblies that are selected to deliver
the air volume specified according to unit size and job requirements. This is
either done with air volume bands in the blower wheels or with VFDs. Field
airflow adjustment may be required at startup.
Air volume bands for the wheels are sized according to the unit’s air delivery
specifications and can also be ordered from the factory for field
installation. Wheels come standard with a 10% air volume band, as a safety
factor, in case additional air volume is required from the unit.
Airflow Adjustment If reduced air volume is required an air volume band or
larger air volume band can be installed within the blower wheel to
reduce the amount of air delivered by the wheel.
If the unit is factory equipped with the air volume band and additional air
volume is required, the band can be removed from the wheel.
Use fan program in AAONEcat32TM to determine the new band size for the
required CFM and static pressure.
The following photos of a wheel are provided for practical guidelines only in
order to identify the air band location in the wheel. Actual field
installation of the air band into the wheel will require access into and
through the blower wheel venture, which may require removal of the fan motor
and wheel.
Air volume bands are made of aluminum, sized and equipped with easy bend tabs
that are to be inserted into pre-punched slots provided on the wheel. Once the
band has been inserted into the slots, it MUST BE secured by bending the tabs
over from the back side of the wheel and also MUST BE secured from the inside
by connecting the ends together with a pop-rivet in the holes provided on the
ends of the band.
Figure 20 – Air Volume Band
46
If the band is field installed, a hand held poprivet tool is recommended for
connecting the band ends together. Caution must be taken to assure that the
band is tightly installed and no damage, denting or alteration to the wheel or
blades occurs during the installation.
Figure 21 – Air Volume Band Tab Locations
required torque setting then tighten the first set screw to the full required
torque setting.
Table 11 – Plenum Fan Set Screw Specifications
SET SCREW DIAMETER 6.4 mm (1/4″) 7.9 mm (5/16″) 9.5 mm (3/8″) 11.1 mm (7/16″) 12.7 mm (1/2″) 14.3 mm (9/16″) 15.9 mm (5/8″) 19.1 mm (3/4″) 22.2 mm (7/8″) 25.4 mm (1″)
TORQUE (Nm [IN-LBS])
9 [80] 14.2 [126] 27.12 [240] 43.4 [384] 84.1 [744] 122 [1,080] 169.5 [1,500]
291.5 [2,580] 406.8 [3,600] 610.2 [5,400]
The gap tolerances that are allowed between the blower and the inlet cone for
the RZ plenum fan blowers are shown in Note: 1/4″ =
6.35 mm, 1/8″ = 3.18 mm
Figure 23. The inlet cone can be moved as necessary to center the cone in
relation to the blower. The blower can be moved on the motor shaft to set the
correct overlap. These tolerances are critical to the performance of the
blower.
Figure 22 – Securing Air Volume Band Ends
For single set screw applications, tighten the set screw to the required
torque setting (Table 11 using a calibrated torque wrench. For double set
screw applications, tighten one set screw to half of the required torque
setting (Table 11) using a calibrated torque wrench. Tighten the second set
screw to the full
Note: 1/4″ = 6.35 mm, 1/8″ = 3.18 mm
Figure 23 – Plenum Fan Gap Tolerances
47
Back Draft Damper Setup The counter balance is shipped loose and may need to
be installed during start-up on some applications. Not all applications will
require the use of the counter balance on the back draft dampers. If the unit
is equipped with back draft dampers on the supply fan, start the fans without
the counter balance and observe the operation of the back draft dampers. If
the back draft dampers do not open completely, then the counter balance can be
installed to assist with the opening of the back draft dampers. Install the
counter balance in the horizontal position when the back draft dampers are
held closed (see Figure 24). The back draft damper will remain open with no
back pressure on the damper. The damper will close completely when back
pressure is applied.
Figure 24 – Closed Back Draft Damper
48
Figure 25 – Open Back Draft Damper
Adjusting Refrigerant Charge Adjusting the charge of a system in the field
must be based on determination of liquid subcooling and evaporator superheat.
On a system with a TXV liquid sub-cooling is more representative of the charge
than evaporator superheat but both measurements must be taken.
CAUTION
The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC’s
and HCFC’s) as of July 1, 1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incarceration may be levied for non-
compliance.
Before Charging Unit being charged must be at or near full load conditions
before adjusting the charge.
Units equipped with hot gas reheat must be charged with the hot gas reheat
valves closed while the unit is in cooling mode to get the proper charge.
After charging, operate unit in
reheat (dehumidification) mode to check for correct operation.
Units equipped with heat pump options must be charged in heating mode to get
the proper charge. After charging, unit must be operated in cooling mode to
check for correct charge. Charge may need to be adjusted for cooling mode. If
adjustments are made in the cooling mode heating mode must be rerun to verify
proper operation.
After adding or removing charge the system must be allowed to stabilize,
typically 10-15 minutes, before making any other adjustments.
The type of unit and options determine the ranges for liquid sub-cooling and
evaporator superheat. Refer to Table 12 and Table 13 when determining the
proper sub-cooling.
Checking Liquid Sub-Cooling Measure the temperature of the liquid line as it
leaves the condenser coil.
Read the gauge pressure at the liquid line close to the point where the
temperature was taken. You must use liquid line pressure as it will vary from
discharge pressure due to condenser coil pressure drop.
Convert the pressure obtained to a saturated temperature using the appropriate
refrigerant temperature-pressure chart.
Subtract the measured liquid line temperature from the saturated temperature
to determine the liquid sub-cooling.
Compare calculated sub-cooling to the Table 12 and Table 13 for the
appropriate unit type and options.
Checking Evaporator Superheat Measure the temperature of the suction line
close to the compressor.
Read gauge pressure at the suction line close to the compressor.
Convert the pressure obtained to a saturated temperature using the appropriate
refrigerant temperature-pressure chart.
Subtract the saturated temperature from the measured suction line temperature
to determine the evaporator superheat.
For refrigeration systems with tandem compressors, it is critical that the
suction superheat setpoint on the TXV is set with one compressor running. The
suction superheat must be 5.6-7.2°C (10-13°F) with one compressor running. The
suction superheat will increase with both compressors in a tandem running.
Inadequate suction superheat can allow liquid refrigerant to return to the
compressors which will wash the oil out of the compressor. Lack of oil
lubrication will destroy a compressor. Liquid subcooling must be measured with
both compressors in a refrigeration system running.
Compare calculated superheat to the Table 12 and Table 13 for the appropriate
unit type and options.
CAUTION
Expansion valve must be adjusted to approximately 4.4-8.3°C (8-15°F) of
suction superheat. Failure to have sufficient superheat will damage the
compressor and void the warranty.
49
Table 12 – Acceptable Fin & Tube Sub-Cooling and Superheat Temperatures
Air-Cooled Condenser (Metric)
Sub-Cooling2
4.4-8.3°C / 1.1-
2.2°C (HP)*
Sub-Cooling with
4.4-8.3°C /1.1-
Hot Gas Reheat2
3.3°C (HP)*
Superheat1
4.4-8.3°C
Evaporative Condenser
Sub-Cooling2
3.3-5.5°C
Sub-Cooling with Hot Gas Reheat2
4.4-6.7°C
Superheat1
5.6-8.3°C
Air-Cooled Condenser (Imperial)
Sub-Cooling2
8-15°F / 2-4°F
(HP)*
Sub-Cooling with Hot
8-15°F /2-6°F
Gas Reheat2 Superheat1
(HP)* 8-15°F
Evaporative Condenser
Sub-Cooling2
6-10°F
Sub-Cooling with Hot Gas Reheat2 Superheat1
8-12°F 10-15°F
Water-Cooled Condenser/ Water Source
Water-Cooled Condenser/ Water Source
Heat Pump in Cooling Mode
Sub-Cooling2
2.2-4.4°C
Heat Pump in Cooling Mode
Sub-Cooling2
4-8°F
Sub-Cooling with Hot Gas Reheat2
Superheat1
4.4-6.7°C 4.4-8.3°C
Sub-Cooling with Hot Gas Reheat2 Superheat1
8-12°F 8-15°F
1 One compressor running in tandem 2 Two compressors running in tandem
Ambient (°C)
19.4 22.2 27.8 35.0 40.6 46.1
Table 13 – Acceptable Microchannel Air-Cooled Condenser Coil Liquid Sub Cooling Values (Metric)
4.4 5.0 – 7.8 5.6 – 8.3 5.6 – 8.3 5.6 – 8.3 6.1 – 8.9 5.6 – 8.3
Cooling Mode Liquid Sub-Cooling Values(°C)
Evaporator Coil Saturation Temperature (°C)
7.2
8.9
10.0
4.4 – 7.2
4.4 – 7.2
3.9 – 6.7
5.0 – 7.8
5.0 – 7.8
4.4 – 7.2
5.6 – 8.3
5.6 – 8.3
5.0 – 7.8
5.6 – 8.3
5.6 – 8.3
5.0 – 7.8
6.1 – 8.9
5.6 – 8.3
5.6 – 8.3
6.1 – 8.9
6.1 – 8.9
6.1 – 8.9
12.8 2.8 – 5.6 3.9 – 6.7 3.9 – 6.7 4.4 – 7.2 4.4 – 7.2 5.0 – 7.8
50
Table 14 – Acceptable Microchannel Air-Cooled Condenser Coil Liquid Sub- Cooling Values (Imperial)
Ambient (°F) 67
Cooling Mode Liquid Sub-Cooling Values(°F)
Evaporator Coil Saturation Temperature (°F)
40
45
48
50
55
9 – 14
8 – 13
8 – 13
7 – 12
5 – 10
72
10 – 15
9 – 14
9 – 14
8 – 13
7 – 12
82
10 – 15 10 – 15 10 – 15
9 – 14
7 – 12
95
10 – 15 10 – 15 10 – 15
9 – 14
8 – 13
105
11 – 16 11 – 16 10 – 15 10 – 15
8 – 13
115
10 – 15 11 – 16 11 – 16 11 – 16
9 – 14
Notes: 1. Microchannel condenser coils are more sensitive to charge. The system must
be running in cooling mode with compressor, supply airflow & condenser fan
speed at full load. The sub-cooling value changes depending on the ambient
temperature reading and the evaporator coil saturation temperature. To findthe
correct sub-cooling value, find the ambient temperature on the first column and
follow that across to the SST (4.4-12.8°C [40-55°F]).
2. Superheat for Microchannel condenser coils must be between 4.4 and 8.3°C (8 – 15°F)
Adjusting Sub-cooling and Superheat Temperatures The system is overcharged if
the sub-cooling temperature is too high and the evaporator is fully loaded
(low loads on the evaporator result in increased sub-cooling) and the
evaporator superheat is within the temperature range as shown in the Table 12
and Table 13 (high superheat results in increased sub-cooling).
Correct an overcharged system by reducing the amount of refrigerant in the
system to lower the sub-cooling.
CAUTION
DO NOT OVERCHARGE!
Refrigerant overcharging leads to excess refrigerant in the condenser coils
resulting in elevated compressor discharge pressure.
The system is undercharged if the superheat is too high and the sub-cooling is
too low.
Correct an undercharged system by adding refrigerant to the system to reduce
superheat and raise sub-cooling.
If the sub-cooling is correct and the superheat is too high, the expansion
valve may need adjustment to correct the superheat.
Freeze Stat Startup Freeze Stat is an adjustable temperature sensor (-23.3°C
to 21.1°C [-10 to 70°F]) mounted on the tubing of the first cooling circuit
and wired to de-energize all cooling circuits if tubing temperature falls
below setpoint. Option is used to prevent freezing of evaporator coil.
Recommended Setting: 0°C to 1.7°C (32° F to 35º F)
51
Table 15 – R-410A Refrigerant Temperature-Pressure Chart (Metric)
°C KPA °C KPA °C KPA °C KPA °C KPA -6.7 539.9 8.3 928.8 23.3 1473.5 38.3
2213.3 53.3 3193.8 -6.1 551.6 8.9