819682-UIM-A-0212
MODULAR
STANDARD ECM AIR HANDLERS
MODELS: MX
ISO 9001
Certified Quality
Management System
LIST OF SECTIONS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
ELECTRIC HEATER INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . .5
LOW VOLTAGE CONTROL CONNECTIONS . . . . . . . . . . . . . . . . . .6
REQUIRED CONTROL SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
LINE POWER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
BLOWER SPEED CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 8
UNIT DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
LIST OF FIGURES
Typical Installation with MC or FC Evaporator Coil . . . . . . . . . . . . . . .3
Coil and Air Handler Attachment Details . . . . . . . . . . . . . . . . . . . . . . .3
Gasket Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Dimensions & Duct Connection Dimensions . . . . . . . . . . . . . . . . . . . .4
Duck Work Transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Typical Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Line Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Blower Speed Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Cooling Models with Electric Heat Wiring . . . . . . . . . . . . . . . . . . . . . 13
Single-Stage Heat Pump Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Two-Stage Heat Pump Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiring Diagram - MX12-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Wiring Diagram - MX20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
LIST OF TABLES
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Low Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Low Fan Control Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Fault Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Blower Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Heat Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Physical and Electrical Data - Cooling Only (60 Hz) . . . . . . . . . . . . . .9
Electrical Data - Cooling Only (60 Hz) . . . . . . . . . . . . . . . . . . . . . . . . .9
Conversion Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Electrical Data - 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . .9
Electrical Data - (For Single Source Power Supply) -
Copper Wire 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Data - (For Multi-Source Power Supply) -
Copper Wire 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Data - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical Data - (For Single Source Power Supply) -
Copper Wire - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical Data - (For Multi-Source Power Supply) -
Copper Wire - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Air Flow Data - 60 Hz Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SECTION I: GENERAL
This modular air handler provides the flexibility for installation in any
upflow, downflow, or horizontal application. These versatile models may
be used for cooling or heat pump operation with or without electric heat.
A BRAND LABEL (available from Distribution) may be applied to the
center of the blower access panel.
The unit can be positioned for bottom return air in the upflow position,
top return air in the downflow position, and right or left return in the hor-
izontal position.
Top and side power wiring and control wiring, accessible screw termi-
nals for control wiring and easy to install electric heaters all combine to
make the installation easy, and minimize installation cost.
SECTION II: SAFETY
This is a safety alert symbol. When you see this symbol on
labels or in manuals, be alert to the potential for personal
injury.
Understand and pay particular attention to the signal words DANGER,
WARNING, or CAUTION.
DANGER indicates an imminently hazardous situation, which, if not
avoided, will result in death or serious injury
.
WARNING indicates a potentially hazardous situation, which, if not
avoided, could result in death or serious injury
.
CAUTION indicates a potentially hazardous situation, which, if not
avoided may result in minor or moderate injury.
It is also used to
alert against unsafe practices and hazards involving only property dam-
age.
Improper installation may create a condition where the operation of
the product could cause personal injury or property damage.
Improper installation, adjustment, alteration, service or maintenance
can cause injury or property damage. Refer to this manual for assis-
tance or for additional information, consult a qualified contractor,
installer or service agency.
This product must be installed in strict compliance with the installation
instructions and any applicable local, state, and national codes
including, but not limited to building, electrical, and mechanical codes.
FIRE OR ELECTRICAL HAZARD
Failure to follow the safety warnings exactly could result in serious
injury, death or property damage.
A fire or electrical hazard may result causing property damage, per-
sonal injury or loss of life.
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