Aaon M2-005 Installation Manual
Do not store gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
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 you 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.
Startup and service must be
performed by a Factory Trained
Service Technician.
M2 Series
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 should be kept
with the unit.
WARNING
Modular Indoor Air Handling Units
Installation, Operation
& Self-Contained Units
& Maintenance
Table of Contents
Safety .............................................................................................................................................. 9
Feature String Nomenclature ........................................................................................................ 15
M2 Series Base Feature String Nomenclature .......................................................................... 16
Fan Module Description ............................................................................................................ 17
Filter Module Description ......................................................................................................... 18
Mixing Module Description ...................................................................................................... 19
Heat Module Description .......................................................................................................... 20
Blank Module Description ........................................................................................................ 22
Coil Module Description ........................................................................................................... 23
Controls Module Description .................................................................................................... 25
Energy Recovery Module Description ...................................................................................... 26
Water-Source Heat Pump Module Description ......................................................................... 27
Unit Orientation ............................................................................................................................ 29
General Information ...................................................................................................................... 30
Codes and Ordinances ............................................................................................................... 31
Receiving Unit ........................................................................................................................... 31
Storage ....................................................................................................................................... 32
Preparation for Storage .............................................................................................................. 32
Direct Expansion (DX) Units .................................................................................................... 32
Gas or Electric Heating ............................................................................................................. 34
Wiring Diagrams ....................................................................................................................... 34
Condensate Drain Pan ............................................................................................................... 34
Installation..................................................................................................................................... 36
Locating Units ........................................................................................................................... 36
Lifting the Assembled Unit ....................................................................................................... 37
Lifting the Individual Modules ................................................................................................. 40
Floor Mounted Units ................................................................................................................. 40
Suspended Units ........................................................................................................................ 40
Module Assembly ..................................................................................................................... 41
Refrigerant Piping for Split Systems ......................................................................................... 46
Determining Refrigerant Line Size ........................................................................................... 47
Equivalent Line Length ......................................................................................................... 47
Liquid Line Sizing ................................................................................................................. 47
Suction Line Sizing ................................................................................................................ 48
Hot Gas Bypass Line ............................................................................................................. 49
Hot Gas Reheat Line .............................................................................................................. 50
Refrigerant-to-Water Heat Exchanger ...................................................................................... 51
Open Loop Applications ........................................................................................................ 51
Freezing Water in the Heat Exchanger .................................................................................. 52
Water Piping .......................................................................................................................... 52
Heat Exchanger Safeties ........................................................................................................ 55
Waterside Economizer .............................................................................................................. 55
Heating Coils ............................................................................................................................. 56
Chilled Water Coils ................................................................................................................... 57
Condensate Drain Piping ........................................................................................................... 57
3
Blower Wheels .......................................................................................................................... 59
Electrically Commutated Motor (ECM) Air Adjustment ...................................................... 59
Banded Wheel Air Adjustment .............................................................................................. 60
Electric Heating ......................................................................................................................... 62
Electrical .................................................................................................................................... 62
Cutting Electrical Openings ................................................................................................... 62
Thermostat Control Wiring .................................................................................................... 64
Gas Fired Duct Furnace ............................................................................................................. 65
Unit Location and Clearances ................................................................................................ 65
Gas Supply, Piping and Connections..................................................................................... 65
Duct Furnace Component Identification ............................................................................... 66
Operating and Safety Instructions ......................................................................................... 67
Startup .................................................................................................................................... 68
Shutdown ............................................................................................................................... 70
Furnace Maintenance ............................................................................................................. 73
Energy Recovery Units ............................................................................................................. 74
Initial Mechanical Check and Setup ...................................................................................... 74
Routine Maintenance and Handling ...................................................................................... 75
Cleaning ................................................................................................................................. 76
Wheel Drive Components ...................................................................................................... 77
Startup Procedure ................................................................................................................... 78
Service ................................................................................................................................... 79
Startup ........................................................................................................................................... 81
Filters ......................................................................................................................................... 81
Check Out .................................................................................................................................. 81
Commissioning .......................................................................................................................... 83
Operation ................................................................................................................................... 83
Adjusting Refrigerant Charge ................................................................................................... 84
Refrigeration Troubleshooting .................................................................................................. 87
Maintenance .................................................................................................................................. 88
Fan Assembly ............................................................................................................................ 88
Bearings ..................................................................................................................................... 88
Belts ........................................................................................................................................... 89
Indoor Coils ............................................................................................................................... 90
Refrigeration Cycle ................................................................................................................... 90
Brazed Plate Heat Exchanger Cleaning .................................................................................... 90
E-Coated Coil Cleaning ............................................................................................................ 90
Electric Heating ......................................................................................................................... 92
Steam or Hot Water Heating ..................................................................................................... 92
Cleaning .................................................................................................................................... 92
Chilled Water ............................................................................................................................ 92
DX Water Source Cooling ........................................................................................................ 92
Condensate Drain Pans .............................................................................................................. 92
Duct Furnace ............................................................................................................................. 92
Lubrication ................................................................................................................................ 92
Replacement Parts ..................................................................................................................... 93
4
AAON-Longview Product Support ........................................................................................... 93
Phase and Brownout Protection Module ................................................................................... 94
Filter Replacement .................................................................................................................... 96
Appendix A - Heat Exchanger Corrosion Resistance ................................................................... 99
Split System Piping Diagrams .................................................................................................... 101
M2 Series Startup Form .............................................................................................................. 117
Maintenance Log ........................................................................................................................ 123
R40681 · Rev. D · 160524
(ACP 30752)
5
Index of Tables and Figures
Tables:
Table 1 – Electric and Gas Heating Capacities ............................................................................. 35
Table 2 - Minimum Clearances ..................................................................................................... 37
Table 3 - Glycol Freezing Points .................................................................................................. 52
Table 4 - Standard Water-Source Connections ............................................................................. 53
Table 5 - Freezing Points .............................................................................................................. 54
Table 6 – Steam Distributing Coil Connection Sizes ................................................................... 56
Table 7 – Hot Water Coil Connection Sizes ................................................................................. 56
Table 8 – Chilled Water Coil Connection Sizes ........................................................................... 57
Table 9 - Drain Trap Dimensions ................................................................................................. 58
Table 10 - Blow-Through Drain Trap Dimensions ....................................................................... 58
Table 11 - Control Wiring............................................................................................................. 64
Table 12 – Gas Inlet Pressure ....................................................................................................... 65
Table 13 - Gas Heater Troubleshooting ........................................................................................ 71
Table 14 - Gas Heater Troubleshooting Continued ...................................................................... 72
Table 15 - Acceptable Air-Cooled Refrigeration Circuit Values ................................................. 85
Table 16 - Acceptable Water-Cooled Refrigeration Circuit Values ............................................. 85
Table 17 - R-410A Refrigerant Temperature-Pressure Chart ....................................................... 86
Table 18 – Refrigeration Problems, Causes, and Solutions .......................................................... 87
Table 19 - Bearing Setscrew Torque Recommendations .............................................................. 89
Table 20 - Fan Bearing Lubrication Schedule .............................................................................. 93
Table 21 - M2-005 and M2-008 Filters ........................................................................................ 96
Table 22 - M2-011 and M2-014 Filters ........................................................................................ 96
Table 23 - M2-018 and M2-022 Filters ........................................................................................ 97
Table 24 - M2-026 Filters ............................................................................................................. 97
Table 25 - M2-032 and M2-036 Filters ........................................................................................ 97
6
Figures:
Figure 1 - Typical M2 Series Selection ........................................................................................ 15
Figure 2 - Unit Orientation ........................................................................................................... 29
Figure 3 - Lockable Handle .......................................................................................................... 32
Figure 4 - Service Access Clearance ............................................................................................ 37
Figure 5 - M2 Series Unit Four Point Lifting ............................................................................... 38
Figure 6 - M2 Series Unit Eight Point Lifting .............................................................................. 39
Figure 7 - M2 Series Individual Module Bottom Tier Lifting ...................................................... 40
Figure 8 - M2 Series Individual Module Top Tier Lifting ........................................................... 40
Figure 9 - Unit Suspension ........................................................................................................... 41
Figure 10 - Module Assembly Schematic ..................................................................................... 43
Figure 11 - Bolted Base Rail ......................................................................................................... 44
Figure 12 - Bar Clamp .................................................................................................................. 44
Figure 13 - Self-Tapping Screw .................................................................................................... 44
Figure 14 - Strap Types................................................................................................................. 45
Figure 15 - Strap Locations........................................................................................................... 45
Figure 16 - Strap Positioning ........................................................................................................ 45
Figure 17 - Strap Installation ........................................................................................................ 45
Figure 18 - TXV Bulb Position ..................................................................................................... 46
Figure 19 - Water-Source Heat Pump Water Piping .................................................................... 52
Figure 20 - Water-Cooled Only Water Piping .............................................................................. 53
Figure 21 – Waterside Economizer Piping ................................................................................... 55
Figure 22 - Steam Distributing Piping .......................................................................................... 56
Figure 23 - Hot Water Piping........................................................................................................ 56
Figure 24 - Chill Water Piping...................................................................................................... 57
Figure 25 - Draw-Through Drain Trap ......................................................................................... 58
Figure 26 - Blow-Through Drain Trap ......................................................................................... 58
Figure 27 – EC Motor Wiring Diagram for Controls by Others ................................................... 59
Figure 28 – Jumper for Remote Fan Speed Control ..................................................................... 59
Figure 29 – Potentiometer ............................................................................................................. 60
Figure 30 - Supply Fan Banding ................................................................................................... 61
Figure 31 - Sediment Trap for Gas Heat ....................................................................................... 66
Figure 32 –Gas Heater Horizontal Configuration ......................................................................... 66
Figure 33 –Gas Heater Vertical Configuration ............................................................................. 67
Figure 34 - Gas Valve ................................................................................................................... 67
Figure 35 - 1.2” w.c. Manifold Natural Gas ................................................................................. 69
Figure 36 - 3.5” w.c. Manifold Natural Gas ................................................................................. 69
Figure 37 - Flame Sensor Current Check ..................................................................................... 70
Figure 38 - Energy Recovery Wheel ............................................................................................ 74
Figure 39 - Cross Section of Air Seal Structure ........................................................................... 75
Figure 40 - Lifting Hole Locations ............................................................................................... 76
Figure 41 - Avoid Racking of Cassette Frame.............................................................................. 78
Figure 42 - Diameter Seal Adjustment ......................................................................................... 78
Figure 43 - Hub Seal Adjustment ................................................................................................. 78
Figure 44 - Segment Retainer ....................................................................................................... 79
Figure 45 - Segment Installation ................................................................................................... 79
7
Figure 46 - Belt Replacement ....................................................................................................... 80
Figure 47 - Angular Misalignment ............................................................................................... 89
Figure 48 - Parallel Misalignment ................................................................................................ 89
Figure 49 - Belt Deflection ........................................................................................................... 89
Figure 50 - Filter Layout ............................................................................................................... 98
Figure 51 - A/C Split System Piping, Suction Down ................................................................. 101
Figure 52 - A/C Split System Piping, Suction Up ...................................................................... 102
Figure 53 - A/C with Modulating Hot Gas Reheat Split System Piping, Suction Down ........... 103
Figure 54 - A/C with Modulating Hot Gas Reheat Split System Piping, Suction Up ................ 104
Figure 55 - A/C with Hot Gas Bypass Split System Piping, Suction Down .............................. 105
Figure 56 - A/C with Hot Gas Bypass Split System Piping, Suction Up ................................... 106
Figure 57 - A/C with Modulating Hot Gas Reheat and Hot Gas Bypass Split System Piping,
Suction Down.............................................................................................................................. 107
Figure 58 - A/C with Modulating Hot Gas Reheat and Hot Gas Bypass Split System Piping,
Suction Up .................................................................................................................................. 108
Figure 59 - Heat Pump Split System Piping, Suction Down ...................................................... 109
Figure 60 - Heat Pump Split System Piping, Suction Up ........................................................... 110
Figure 61 - Heat Pump with Modulating Hot Gas Reheat Split System Piping, Suction Down 111
Figure 62 - Heat Pump with Modulating Hot Gas Reheat Split System Piping, Suction Up ..... 112
Figure 63 - Heat Pump with Hot Gas Bypass Split System Piping, Suction Down ................... 113
Figure 64 - Heat Pump with Hot Gas Bypass Split System Piping, Suction Up ........................ 114
Figure 65 - Heat Pump with Modulating Hot Gas Reheat and Hot Gas Bypass Split System
Piping, Suction Down ................................................................................................................. 115
Figure 66 - Heat Pump with Modulating Hot Gas Reheat and Hot Gas Bypass Split System
Piping, Suction Down ................................................................................................................. 116
8
Safety
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.
WARNING
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.
CAUTION
Attention should 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.
QUALIFIED INSTALLER
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.
A copy of this IOM should be kept
with the unit.
WARNING
9
Electric shock hazard. Before
servicing, shut off all electrical power
to the unit, including remote
disconnects, to avoid shock hazard
or injury from rotating parts. Follow
proper Lockout-Tagout procedures.
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.
WARNING
During installation, testing, servicing,
and troubleshooting of the equipment
it may be necessary to work with live
electrical components. Only a
qualified licensed electrician or
individual properly trained in handling
live electrical components shall
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, should be
followed.
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
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
10
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.
CAUTION
UNIT HANDLING
To prevent injury or death lifting
equipment capacity shall 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.
WARNING
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
should be checked for proper
operation. Alterations should only be
made at the unit power connection
CAUTION
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 should be field supplied on
system water piping.
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.
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.
WARNING
11
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
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.
CAUTION
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.
WARNING
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 the
condenser water loop with harsh
chemicals, such as hydrochloric acid
(muriatic acid) or chlorine, can
damage the water-cooled condenser.
Care should be taken to avoid
allowing chemicals to enter the
water-cooled condenser. See
Appendix A - Heat Exchanger
Corrosion Resistance for more
information.
CAUTION
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
12
HOT PARTS
Disconnect all power, close all
isolation valves and allow equipment
to cool before servicing equipment to
prevent serious injury. Equipment
may have multiple power supplies.
Electric resistance heating elements
and hot water or steam heating coils
may have automatic starts. Hot water
will circulate even after power is off.
COMPRESSOR CYCLING
5 MINUTE OFF TIME
To prevent motor overheating,
compressors must cycle off for a
minimum of 5 minutes.
5 MINUTE ON TIME
To maintain the proper oil level,
compressors must cycle on for a
minimum of 5 minutes.
The cycle rate must not exceed 6
starts per hour.
WARNING
PVC (Polyvinyl Chloride) and CPVC
(Chlorinated Polyvinyl Chloride) are
vulnerable to attack by certain
chemicals. Polyolester (POE) oils
used with R-410A and other
refrigerants, even in trace amounts,
in a PVC or CPVC piping system will
result in stress cracking of the piping
and fittings and complete piping
system failure.
CAUTION
Do not weld or cut foam panel with
plasma cutters or a cutting torch –
When burnt the foam produces
dangerous fumes.
WARNING
Do not work in a closed area where
refrigerant or nitrogen gases may be
leaking. A sufficient quantity of
vapors may be present and cause
injury or death.
WARNING
Never attempt to open an access
door or remove a panel while the unit
is running. Pressure in the unit can
cause excessive force against the
panel.
Ensure that sufficient dampers will be
open to provide air path before fan is
allowed to run.
WARNING
WARNING
CAUTION
13
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. 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.
4. Always install and operate furnace
within the intended temperature rise
range and duct system external static
pressure (ESP) as specified on the unit
nameplate.
5. 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 should be an L shaped duct.
6. Clean furnace, duct and components
upon completion of the construction
setup. Verify furnace operating
conditions including input rate,
temperature rise and ESP.
7. 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.
8. READ THE ENTIRE INSTALLATION,
OPERATION AND MAINTENANCE
MANUAL. OTHER IMPORTANT
SAFETY PRECAUTIONS ARE
PROVIDED THROUGHOUT THIS
MANUAL.
9. Keep this manual and all literature
safeguarded near or on the unit.
14
Feature String Nomenclature
Base Feature String
Individual Module Feature String
Identifies the main unit features and options.
Identifies module configurations, features and
options.
BBD-101-0-00-00000-00000-0-0
FTH-102-P-C0-20000-CE000-C-X
HRA-103-A-00-00000-00000-0-0
M2-H-026-L-2-A-A-0-C-0
: MBH-104-A-00-00000-0000-0-0
CLC-105-E-00-00000-610I0-S-0
SDB-106-M-EI-C0000-00000-0-0
PHG-107-H-00-00000-C0M0A-0-0
EDB-201-L-GI-C0000-00000-0-0
MBD-203-A-A0-00000-B0000-0-0
Complete Feature String
A complete unit feature string consists of a
base model feature string followed by a
series of individual module feature strings.
The first three letters of the individual
module model number identify the type of
module (fan, filter, coil, etc). The three
numbers after the three letters indicate the
position of the module in unit assembly. If
the module is on the bottom level, the first
number is 1 while the first number in the top
level is 2. The last number increases in value
from the return/outside air section to the
discharge air section. In the below example,
the cooling coil module in Figure 1, CLC105-E-00-00000-610I0-0-0, is the fifth
module on the first level of the unit. The
exhaust fan, EDB-201-L-GI-C000-00000-00, is the first module on the second level.
Figure 1 - Typical M2 Series Selection
15
M2 Series Base Feature String Nomenclature
Model Options
GEN TYPE UNIT SIZE SUPPLY
AIRFLOW VOLTAGE ASSEMBLY WIRING PAINT BASE RAIL SPECIAL
M2
- H -
011
- R - 2 - A - A - 0 - C -
0
M2 Series Base Feature String Nomenclature
BASE MODEL DESCRIPTION
Series and Generation
M2
Type
H = Horizontal
Unit Size
005 = 5 ft2 Coil (1,000 – 2,700 cfm)
008 = 8 ft2 Coil (2,000 – 4,400 cfm)
011 = 11 ft2 Coil (3,100 – 6,000 cfm)
014 = 14 ft2 Coil (5,000 – 7,700 cfm)
018 = 18 ft2 Coil (6,000 – 10,300 cfm)
022 = 22 ft2 Coil (9,900 – 13,200 cfm)
026 = 26 ft2 Coil (11,500 – 15,600 cfm)
032 = 32 ft2 Coil (13,500 – 19,200 cfm)
036 = 36 ft2 Coil (15,500 – 21,600 cfm)
Supply Airflow
L = Left Hand
R = Right Hand
Voltage
1 = 230V/1Φ/60Hz
2 = 230V/3Φ/60Hz
3 = 460V/3Φ/60Hz
4 = 575V/3Φ/60Hz
8 = 208V/3Φ/60Hz
9 = 208V/1Φ/60Hz
Assembly
A = Factory Assembled
B = Individual Boxes
Wiring
A = Control Wiring in Fan Box
B = Control Wiring in Control Box
Paint
0 = None - Standard
A = Indoor Unit with Exterior Corrosion Protection
B = Indoor Unit with Interior and Exterior Corrosion
Protection
E = Shipping Shrink Wrap
F = Indoor Unit with Exterior Corrosion Protection +
Shipping Shrink Wrap
G = Indoor Unit with Interior and Exterior Corrosion
Protection + Shipping Shrink Wrap
Base Rail
B = 8” High
C = 6” High
D = 10” High
Special
0 = None
X = Special Pricing Authorization
16
Fan Module Feature String Nomenclature
MODULE ID POSITION MOTOR
SIZE BLOWER
ISOLATION MOTOR
TYPE
BLANK
PULLEYS SAFETY
CONTROL
BLANK BLANK SPECIAL
SFA
-
103
- E - B I - A
00
0C - 0
0000
- 0 -
0
Fan Module Description
FAN MODULE DESCRIPTION
Module ID
SFA = Belt Driven Supply
SFC = Belt Drive Supply, Top Discharge
SFD = Belt Driven Supply, No Control Panel
SDB = Direct Drive Supply
SDD = Direct Drive Supply, Top Discharge
SDM = Dual Fan Direct Drive Supply
SDN = Dual Fan Direct Drive Supply, Top Discharge
PEA = Belt Driven Power Exhaust
PEC = Belt Driven Power Exhaust, Top Discharge
EDB = Direct Drive Power Exhaust
EDD = Direct Drive Power Exhaust, Top Discharge
RFA = Belt Driven Power Return
RDB = Direct Drive Power Return
RDM = Dual Fan Direct Drive Power Return
Position
### = Level and Position of Module in Air Handling
Unit
Motor Size
E = 1 hp
F = 2 hp
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 = 1.0 kW (1.3 hp)
S = 1.7 kW (2.3 hp)
T = 3.0 kW (4.0 hp)
U = 5.4 kW (8.0 hp)
Blower
A = 15” Backward Curved Plenum
B = 18” Backward Curved Plenum
C = 22” Backward Curved Plenum
D = 27” Backward Curved Plenum
E = 30” Backward Curved Plenum
F = 33” Backward Curved Plenum
G = 37” Backward Curved Plenum
H = 24” Backward Curved Plenum
J = 15” BC Plenum - 50% Width
K = 18” BC Plenum - 30% Width
L = 2 x 18” Backward Curved Plenum
M = 2 x 22” Backward Curved Plenum
N = 2 x 24” Backward Curved Plenum
P = 2 x 27” Backward Curved Plenum
Q = 14” ECM Backward Curved Plenum
R = 16” ECM Backward Curved Plenum
S = 18” ECM Backward Curved Plenum
T = 18” ECM Backward Curved Plenum
Isolation
0 = Standard
I = Fan Isolation
Motor Type
A = Standard Efficiency 1760 rpm
B = Premium Efficiency 1760 rpm
C = Premium Eff. 1760 rpm with VFD
D = Premium Eff. 1760 rpm with VFD and Bypass
E = Premium Efficiency 1170 rpm
F = Premium Eff. 1170 rpm with VFD
G = EC Motor
Blank
00 = Standard
Pulleys
## = Pulley Combination
Safety Control
0 = None
A = Phase & Brownout Protection
Blank
0000 = Standard
Blank
0 = Standard
Special
0 = None
X = Special Pricing Authorization
17
Filter Module Feature String Nomenclature
MODULE ID POSITION FILTER
TYPE FILTERS SAFETY
CONTROL
BLANK 2
ND
FILTER
TYPE
2
ND
FILTER
BLANK FILTER
OPTIONS SPECIAL
FTA
-
102
- P -
A0 - 0
0000
- 0 00
00 - 0 - 0
Filter Module Description
FILTER MODULE DESCRIPTION
Module ID
FTA = Small Flat Filter
FTC = Cartridge Filter
FTE = Medium Flat Filter
FTF = Large Flat Filter
FTH = Cartridge Filter with Flat Pre-Filter
FTK = Extra Large Flat Filter
Position
### = Level and Position of Module in Air Handling
Unit
Filter Type
P = Pleated
C = Cartridge
Filters
A0 = 2” Pleated, 30% Eff.
B0 = 4” Pleated, 30% Eff.
C0 = 4” Pleated, 65% Eff. or 12” Cartridge, 65% Eff.
D0 = 4” Pleated, 85% Eff. or 12” Cartridge, 85% Eff.
E0 = 4” Pleated, 95% Eff. or 12” Cartridge, 95% Eff.
Safety Control
0 = Standard
2 = Firestat
Blank
0000 = Standard
Second Filter Type
0 = Standard - None
C = Cartridge
Second Filter
00 = Standard - None
C0 = 12” Cartridge, 65% Eff.
D0 = 12” Cartridge, 85% Eff.
E0 = 12” Cartridge, 95% Eff.
Blank
00 = Standard
Filter Options
0 = Standard - None
A = Magnehelic Gauge
B = Clogged Filter Switch
C = Magnehelic Gauge & Clogged Filter Switch
Special
0 = None
X = Special Pricing Authorization
18
Mixing Module Feature String Nomenclature
MODULE ID POSITION ACTUATOR
TYPE FILTERS SAFETY
CONTROL
BLANK BYPASS
OPENING
BLANK FILTER
OPTIONS SPECIAL
MBH
-
101
- A -
00 - 0
0000
- 0 0000
- 0 -
0
Mixing Module Description
MIXING MODULE DESCRIPTION
Module ID
MBA = Vertical Damper
MBB = Horizontal Top Damper
MBC = Vertical & Horizontal Bottom Damper
MBD = Vertical Damper with Filter
MBE = Horizontal Top Damper with Filter
MBF = Horizontal Bottom Damper
MBH = Vertical & Horizontal Top Damper
MBI = Horizontal Bottom Damper with Filter
MBJ = Vertical & Horizontal Top Damper with Filter
MBK = Vertical & Horizontal Bottom Damper with
Filter
Position
### = Level and Position of Module in Air Handling
Unit
Actuator Type
0 = Standard - None
A = Two Position Actuator
B = DDC Actuator
Filters
00 = Standard - None
A0 = 2” Pleated, 30% Eff.
B0 = 4” Pleated, 30% Eff.
C0 = 4” Pleated, 65% Eff.
D0 = 4” Pleated, 85% Eff.
E0 = 4” Pleated, 95% Eff.
Safety Control
0 = Standard
2 = Firestat
Blank
0000 = Standard
Bypass Opening
0 = Standard - None
A = Top Open
B = Bottom Open
Blank
0000 = Standard
Filter Options
0 = Standard - None
A = Magnehelic Gauge
B = Clogged Filter Switch
C = Options A + B
Special
0 = Standard - None
X = Special Pricing Authorization
19
Heat Module Feature String Nomenclature
MODULE ID POSITION FUNCTION FILTERS ROWS
FPI
CIRCUITING
COATING HEAT
CAPACITY
STAGES
FUEL GAS
COMB
INTAKE FILTER
OPTIONS SPECIAL
PHA
-
101
- H -
00 - 0
00 0 0 - E
02 0 0 - 0 - 0
Heat Module Description
HEAT MODULE DESCRIPTION
Module ID
PHA = Electric Heat
PHB = Hot Water Coil
PHC = Hot Water Coil with Filter
PHD = Electric Heat with Filter
PHG = Gas Heat
Position
### = Level and Position of Module in Air Handling
Unit
Function
H = Heating
Filters
00 = None
A0 = 2” Pleated, 30% Eff.
B0 = 4” Pleated, 30% Eff.
C0 = 4” Pleated, 65% Eff.
D0 = 4” Pleated, 85% Eff.
E0 = 4” Pleated, 95% Eff.
HEATING COIL
Rows
0 = No Hot Water Heating
1 = 1 Row
2 = 2 Rows
FPI
00 = No Hot Water Heating
08 = 8 Fins Per Inch
10 = 10 Fins Per Inch
12 = 12 Fins Per Inch
Circuiting
0 = No Hot Water Heating
F = Single Serpentine
H = Half Serpentine
Q = Quarter Serpentine
Coating
0 = Standard
H = Stainless Steel Coil Casing & Copper Fins
P = Polymer E-Coating
S = Stainless Steel Coil Casing
Heat Capacity
0 = Hot Water Heating Coil
1 = 150 MBH input
2 = 75 MBH input
3 = 100 MBH input
4 = 125 MBH input
5 = 150 MBH input
6 = 175 MBH input
7 = 200 MBH input
8 = 250 MBH input
A = 300 MBH input OR 7 kW (5.3 kW @ 208V)
B = 350 MBH input OR 14 kW (10.5kW @ 208V)
C = 400 MBH input OR 21 kW (15.8 kW @ 208V)
D = 28 kW (21 kW @ 208V)
E = 42 kW (31.5 kW @ 208V)
F = 56 kW (42 kW @ 208V)
G = 70 kW (52.2 kW @ 208V)
H = 35 kW (26.3 kW @ 208V)
J = 84 kW (63 kW @ 208V)
K = 112 kW (84.1 kW @ 208V)
L = 126 kW (94.6 kW @ 208V)
M = 168 kW (126.2 kW @ 208V)
N = 10 kW (7.5 kW @ 208V)
P = 20 kW (15 kW @ 208V)
Q = 30 kW (22.5 kW @ 208V)
R = 40 kW (30 kW @ 208V)
S = 50 kW (37.5 kW @ 208V)
T = 80 kW (60.1 kW @ 208V)
U = 100 kW (75.1 kW @ 208V)
V = 120 kW (90.1 kW @ 208V)
W = 160 kW (120.1 kW @ 208V)
20
Heat Module Feature String Nomenclature
MODULE ID POSITION FUNCTION FILTERS ROWS
FPI
CIRCUITING
COATING HEAT
CAPACITY
STAGES
FUEL GAS
COMB
INTAKE FILTER
OPTIONS SPECIAL
PHA
-
101
- H -
00 - 0
00 0 0 - E
02 0 0 - 0 - 0
Stages
00 = Hot Water Heating Coil
01 = 1 Stage
02 = 2 Stage
03 = 3 Stage
04 = 4 Stage
0M = Modulating 5:1 Stage Natural Gas
Modulating 3:1 Stage LP Gas
Fuel Gas
0 = Natural Gas [Hot Water/Electric Heat]
A = LP Gas
Combustion Intake
0 = Open Combustion [Hot Water/Electric Heat]
A = Separated Combustion
Filter Options
0 = Standard
A = Magnehelic Gauge
B = Clogged Filter Switch
C = Options A + B
Special
0 = None
X = Special Pricing Authorization
S = Steam Heating
21
Blank Module Feature String Nomenclature
MODULE ID POSITION BLANK AIRWAY
TYPE SAFETY
CONTROL
BLANK BYPASS
OPENING
BLANK DRAIN PAN
TYPE SPECIAL
BBA
-
101
- 0 -
AR - 0
0000
- 0 0000
- 0 -
0
Blank Module Description
BLANK MODULE DESCRIPTION
Module ID
BBA = Small
BBB = Medium
BBC = Large
BBD = XL
BBE = XXL
BBF = XXXL
BBG = Extended Large
CBA = Small with Drain Pan
CBB = Medium with Drain Pan
CBC = Large with Drain Pan
CBD = XL with Drain Pan
CBE = XXL with Drain Pan
CBF = XXXL with Drain Pan
CBG = Extended Large with Drain Pan
Position
### = Level and Position of Module in Air Handling
Unit
Blank
0 = Standard
Airway Type
00 = Standard
AR = Top Open, Right Hand End Panel
AL = Top Open, Left Hand End Panel
Safety Control
0 = None
2 = Firestat
Blank
0000 = Standard
Bypass Opening
0 = None
A = Top Opening
B = Bottom Opening
Blank
0000= Standard
Drain Pan Type
0 = None
A = Auxiliary
Special
0 = None
X = Special Pricing Authorization
22
Coil Module Feature String Nomenclature
MODULE ID POSITION COOLING
TYPE ELECTRIC
HEAT kW
ELEC HEAT
STAGES HEATING
COIL ROWS
HEATING
COIL FPI
HEATING
COIL CKT
HEAT COIL
COATING COOLING
COIL ROWS
COOLING
COIL FPI
COOLING
COIL CKT
COOL COIL
COATING DRAIN PAN
TYPE SPECIAL
CLC
-
101
- C - 0 0 - 0
00 0 0 - 4
10
F 0 - S -
0
Coil Module Description
COIL MODULE DESCRIPTION
Module ID
CLB = Chilled Water or DX
CLC = DX + Hot Gas Reheat
CLF = Hot Water + Chilled Water or DX
CLG = Electric Heat + Chilled Water or DX
CLI = Hot Water, Chilled Water, or DX with Face
and Bypass Dampers
CLM = Chilled Water or DX, Shorter Length
Position
### = Level and Position of Module in Air Handling
Unit
Cooling Type
0 = None
C = Chilled Water
F = DX R-410A
G = DX R-410A + Hot Gas Bypass
ELECTRIC HEAT
Capacity
0 = No Electric Heat
A = 7 kW (5.3 kW)
B = 14 kW (10.5 kW)
C = 21 kW (15.8 kW)
D = 28 kW (21.0 kW)
H = 35 kW (26.3 kW)
E = 42 kW (35.0 kW)
F = 56 kW (42.0 kW)
G = 70 kW (52.5 kW)
J = 84 kW (63.1 kW)
K = 112 kW (84.1 kW)
L = 126 kW (94.6 kW)
M = 168 kW (126.2 kW)
Stages
0 = Standard - None
1 = 1 Stage
2 = 2 Stage
3 = 3 Stage
4 = 4 Stage
HEATING COIL
Rows
0 = No Hot Water Heating
1 = 1 Row
2 = 2 Rows
FPI
00 = No Hot Water Heating
08 = 8 Fins Per Inch
10 = 10 Fins Per Inch
12 = 12 Fins Per Inch
14 = 14 Fins Per Inch
Circuiting
0 = No Hot Water Heating
F = Single Serpentine
H = Half Serpentine
Q = Quarter Serpentine
Coating
0 = Standard
P = Polymer E-Coating
S = Stainless Steel Coil Casing
H = Stainless Steel Coil Casing & Copper Fins
K = Stainless Steel Coil Casing & Polymer ECoating
COOLING COIL
Rows
0 = No Cooling Coil
4 = 4 Rows
6 = 6 Rows
8 = 8 Rows
FPI
00 = No Cooling Coil
08 = 8 Fins Per Inch
10 = 10 Fins Per Inch
12 = 12 Fins Per Inch
23
Coil Module Feature String Nomenclature
MODULE ID POSITION COOLING
TYPE ELECTRIC
HEAT kW
ELEC HEAT
STAGES HEATING
COIL ROWS
HEATING
COIL FPI
HEATING
COIL CKT
HEAT COIL
COATING COOLING
COIL ROWS
COOLING
COIL FPI
COOLING
COIL CKT
COOL COIL
COATING DRAIN PAN
TYPE SPECIAL
CLC
-
101
- C - 0 0 - 0
00 0 0 - 4
10
F 0 - S -
0
Circuiting
0 = No Cooling Coil
D = Double Serpentine
F = Single Serpentine
H = Half Serpentine
Q = Quarter Serpentine
S = DX Single Circuit
I = DX Dual Circuit, Interlaced
Coating
0 = Standard
P = Polymer E-Coating
S = Stainless Steel Coil Casing
H = Stainless Steel Coil Casing & Copper Fins
K = Stainless Steel Coil Casing & Polymer ECoating
Drain Pan
0 = No Drain Pan
S = Stainless Steel
Special
0 = None
X = Special Pricing Authorization
S = Steam Heating
24
Controls Module Feature String Nomenclature
MODULE ID POSITION BLANK BLANK SAFETY
CONTROL
BLANK BLANK BLANK SPECIAL
TRA
-
101
- 0 -
00 - 0
0000
-
00000
- 0 -
0
Controls Module Description
CONTROLS MODULE DESCRIPTION
Module ID
TRA = Small
TRB = Medium
TRC = Large
TRD = XL
TRE = XXL
TRF = XXXL
Position
### = Level and Position of Module in Air Handling
Unit
Blank
0 = Standard
Blank
00 = Standard
Safety Control
0 = Standard
2 = Firestat
Blank
0000 = Standard
Blank
00000 = Standard
Blank
0 = Standard
Special
0 = None
X = Special Pricing Authorization
25
Energy Recovery Module Feature String Nomenclature
MODULE ID POSITION WHEEL
SIZE RECOVERY
TYPE BLANK BLANK VFD
CONTROL SPECIAL
HRA
-
101
- A -
00 - 00000
-
00000
- 0 -
0
Energy Recovery Module Description
ENERGY RECOVERY MODULE
DESCRIPTION
Module ID
HRA = AAONAIRE® Energy Recovery Wheel
Position
### = Level and Position of Module in Air Handling
Unit
Wheel Size
A = Standard
Recovery Type
00 = Total Energy Recovery
0A = Total Energy Recovery + 1% Purge
A0 = Sensible Only Energy Recovery
AA = Sensible Only Energy Recovery + 1% Purge
Blank
00000 = Standard
Blank
00000 = Standard
VFD Control
0 = Standard
A = VFD Controlled Wheel
Special
0 = None
X = Special Pricing Authorization
26
Water-Source Heat Pump Module Feature String Nomenclature
MODULE ID POSITION REVISION CAPACITY COMP
STAGING
BLANK REFRIG
OPTIONS
REFRIG
ACCESS
BLANK
WATER
SIDE
HEAT
EXCHANGER
BLANK SPECIAL
WHP
-
101
- 0 -
25 - D K 000
- D A 0 B
0 - 0 - 0
Water-Source Heat Pump Module Description
WATER-SOURCE HEAT PUMP
MODULE DESCRIPTION
Module ID
WHP = Water-Source Heat Pump
WCC = Water-Cooled Condenser (A/C only)
Position
### = Level and Position of Module in Air Handling
Unit
Revision
0
Capacity
03 = 3 tons
04 = 4 tons
05 = 5 tons
06 = 6 tons
07 = 7 tons
08 = 8 tons
10 = 10 tons
11 = 11 tons
13 = 13 tons
15 = 15 tons
16 = 16 tons
18 = 18 tons
20 = 20 tons
25 = 25 tons
30 = 30 tons
40 = 40 tons
50 = 50 tons
60 = 60 tons
70 = 70 tons
Compressor Style
A = R-410A Scroll Compressor
B = R-410A 2-Step Capacity Scroll Compressor
D = R-410A Variable Capacity Scroll Compressor
E = R-410A Tandem Scroll Compressor
G = R-410A Tandem Variable Capacity Scroll
Compressor
Staging
G = 1 On/Off Refrigeration System
H = 1 Variable Capacity Refrigeration System
J = 2 On/Off Refrigeration Systems
K = Lead Variable Capacity Refrigeration System +
Lag On/Off Refrigeration System
L = 2 Variable Capacity Refrigeration Systems
Blank
000 = Standard
Refrigeration Options
0 = Standard
A = Hot Gas Bypass [HGB] - Lead & Lag Stage
C = HGB Lag
D = Modulating Hot Gas Reheat [MHGR]
F = HGB - Lead & Lag Stage + MHGR
G = HGB - Lag Stage + MHGR
Refrigeration Accessories
0 = Standard
A = Sight Glass
B = Compressor Isolation Valves
C = Sight Glass + Compressor Isolation Valves
Blank
0 = Standard
Water-Side Options
0 = Standard
A = Balancing Valves
B = Water Flow Switch
C = Motorized Shut-off Valve
D = 2 Way Head Pressure Control
E = 3 Way Head Pressure Control
F = Options B + A
G = Options B + C
H = Options B + D
J = Options B + E
K = Options B +A + C
L = Options B + A + D
M = Options B + A + E
P = Options A + C
Q = Options A + D
R = Options A + E
27
Water-Source Heat Pump Module Feature String Nomenclature
MODULE ID POSITION REVISION CAPACITY COMP
STAGING
BLANK REFRIG
OPTIONS
REFRIG
ACCESS
BLANK
WATER
SIDE
HEAT
EXCHANGER
BLANK SPECIAL
WHP
-
101
- 0 -
25 - D K 000
- D A 0 B
0 - 0 - 0
Heat Exchanger Type
0 = Standard
A = SMO 254 Brazed Plate Heat Exchanger
B = Cupronickel Coaxial Heat Exchanger
Blank
0 = Standard
Special
0 = None
X = Special Pricing Authorization
28
Consider the airflow to be
hitting the back of your head.
M2 Series
Top View
Return Air
“Back”
Supply Air
“Front”
Left Hand Side
Right Hand Side
Connections & service
AIRFLOW
Filter
Coil
Supply Fan
Unit Orientation
Determine left hand or right hand orientation/connections:
access on left side for
left hand orientation
Figure 2 - Unit Orientation
29
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.
A copy of this IOM should be kept
with the unit.
WARNING
These units must not be used as a
“construction heater” 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.
CAUTION
This equipment is protected by a
standard limited warranty under the
condition that initial installation,
service, startup and maintenance is
performed according to the
instructions set forth in this manual.
This manual should be read in its
entirety prior to installation and
before performing any service or
maintenance work.
Equipment described in this manual
is available with many optional
accessories. If you have questions
after reading this manual in its
entirety, consult other factory
documentation or contact your AAON
Sales Representative to obtain
further information before
manipulating this equipment or its
optional accessories
CAUTION
General Information
M2 Series modular indoor air handling units
and self-contained units have been designed
for indoor installation. Flexible connectors
are required on all duct connections to
minimize air leaks.
M2 Series units are designed for safe
operation when installed, operated and
maintained within design specifications and
the instructions in this manual. It is
necessary to follow these instructions to
avoid personal injury or damage to
equipment or property during equipment
installation, startup, operation and
maintenance.
30
Certification of Gas Heat Models
a. Certified as a Category III forced air
furnace with or without cooling.
b. Certified for indoor installation.
Certification of Steam or Hot Water Heat
Models
a. Certified as a forced air heating system
with or without cooling.
b. Certified for indoor installation.
Certification of Electric Heat Models
a. Certified as an electric warm air furnace
with or without cooling.
b. Certified for indoor installation.
Certification of Cooling Models
a. Certified as a commercial central air
conditioner.
b. Certified for indoor installation.
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