Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Heater Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Check Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Mount Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Nuisance sweating may occur if the unit is installed in a high humidity
environment with low airflow.. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Upflow Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Downflow Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Air Ducts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Ductwork Acoustical Treatment . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Line Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
24V Control System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Manufactured Housing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ground Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Minimum CFM and Motor Speed Selection . . . . . . . . . . . . . . . . . 7
Refrigerant Tubing Connection and Evacuation . . . . . . . . . . . . . . . . 8
Refrigerant Flow-Control Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Continuous Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Cooling Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Heat Pump Heating with Auxiliary Electric Heat . . . . . . . . . . . . 10
Electric Heat or Emergency Heat Mode . . . . . . . . . . . . . . . . . . . 10
Start-up Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Care and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Safety Considerations
Improper installation, adjustment, alteration, service, maintenance, or
use can cause explosion, fire, electrical shock, or other conditions which
may cause death, personal injury or property damage. Consult a
qualified installer, service agency, or your distributor or branch for
information or assistance. The qualified installer or agency must use
factory-authorized kits or accessories when modifying this product.
Refer to the individual instructions packaged with kits or accessories
when installing.
Follow all safety codes. Wear safety glasses, protective clothing and
work gloves. Have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in literature and
attached to the unit. Consult local building codes and the current editions
of the National Electrical Code (NEC) NFPA 70.
In Canada, refer to the current editions of the Canadian Electrical Code
CSA C22.1.
Recognize safety information. This is the safety-alert symbol . When
you see this symbol on the unit and in instruction manuals, be alert to the
potential for personal injury.
Understand the signal words DANGER, WARNING, and CAUTION.
These words are used with the safety-alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury or
death. WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe practices which
may result in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced
installation, reliability, or operation.
PF4MNX
FAN COIL UNITS
SIZES 018 TO 060
WARNING
!
PERSONAL INJURY / PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in property damage, personal
injury, or death.
For continued performance, reliability, and safety, the only approved
accessories and replacement parts are those specified by the equipment
manufacturer. The use of non-manufacturer approved parts and
accessories could invalidate the equipment limited warranty and result
in fire risk, equipment malfunction, and failure. Please review
manufacturer’s instructions and replacement part catalogs available
from your equipment supplier.
WARNING
!
ELECTRICAL OPERATION HAZARD
Failure to maintain proper clearances could result in personal injury or
death.
Before installing or servicing unit, always turn off all power to unit.
There may be more than 1 disconnect switch. Turn off accessory heater
power if applicable.
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing, safety glasses and gloves when
handling parts.
CAUTION
!
HOT TUBE WARNING
Failure to follow this caution could result in personal injury and/or
property damage.
Refrigerant lines can reach or exceed 130 °F (54 °C). Avoid contact
with the vapor header or vapor line, especially in Heating Mode. Do not
service A2L refrigerant fan coils while these components are hot to
avoid risk of ignition source.
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