Nortek GMH24-36MSK4DH1 User manual

Owner's Manual
Installation Instructions
Heat Pump
Air Handlers
Models:
GMH24-36MSK4DH1
GMH48-60MSK4DH1
Please read this owner’s manual carefully before operation and retain for future
reference. Specifications & illustrations subject to change without notice or incurring
obligations. If you have lost the owner’s manual, please visit www.NortekHVAC.com
for electronic version.

To Users
Thank you for selecting our product. Please read this instruction manual carefully
before installing and using the product, so as to master and correctly use the product. In
order to guide you to correctly install and use our product and achieve expected
operating effect, we hereby instruct as below:
(1) This appliance can be used by children aged from 8 years and above and persons
with reduced physical, sensory or mental capabilities or lack of experience and
knowledge if they have been given supervision or instruction concerning use of
the appliance in a safe way and understand the hazards involved. Children shall
not play with the appliance. Cleaning and user maintenance shall not be made by
children without supervision.
(2) In order to ensure reliability of product, the product may consume some power
under stand-by status for maintaining normal communication of system and
preheating refrigerant and lubricant. If the product is not to be used for long, cut off
the power supply; please energize and preheat the unit in advance before reusing
it.
(3) Please properly select the model according to actual using environment;
otherwise it may impact the using convenience.
(4) This product can’t be installed at corrosive, inflammable or explosive environment
or the place with special requirements, such as kitchen. Otherwise, it will affect the
normal operation or shorten the service life of the unit, or even cause fire hazard or
serious injury. As for above special places, please adopt special air conditioner
with anti-corrosive or anti-explosion function.
(5) If the product needs to be installed, moved or maintained, please contact our
designated dealer or local service center for professional support. Users should
not disassemble or maintain the unit by themselves, otherwise it may cause
relative damage, and our company will bear no responsibilities.
(6) All the illustrations and information in the instruction manual are only for reference.
In order to make the product better, we will continuously conduct improvement and
innovation. If there is adjustment in the product, please subject to actual product.
(7) If the supply cord is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.

(8) Nortek Global HVAC, LLC assumes no responsibility for personal injury, property
loss or equipment damage caused by improper installation and commissioning,
unnecessary maintenance, or not following relevant national rules and regulations,
industrial standards and requirements in this instruction manual.
Exception Clauses
Manufacturer will bear no responsibilities when personal injury or property loss is
caused by the following reasons:
(1) Damage the product due to improper use or misuse of the product.
(2) Alter, change, maintain or use the product with other equipment without abiding by
the instruction manual of manufacturer.
(3) After verification, the defect of product is directly caused by corrosive gas.
(4) After verification, defects are due to improper operation during transportation of
product.
(5) Operate, repair, maintain the unit without abiding by instruction manual or related
regulations.
(6) After verification, the problem or dispute is caused by the quality specification or
performance of parts and components that produced by other manufacturers.
(7) The damage is caused by natural calamities, bad using environment or force
majeure.

Contents
1 Safety Precautions ............................................................ 1
2 Product Introduction ......................................................... 3
2.1 Product Description................................................................3
2.2 Optional Accessories..............................................................3
2.3 Physical Dimension................................................................4
2.4 Names of Main Parts..............................................................5
2.5 General Information ...............................................................5
2.6 Dip switch configuration .........................................................5
2.7 Fan Performance Data ........................................................6
3 Preparative for Installation................................................ 9
3.1 Pre-Installation Instruction......................................................9
3.2 Important Safety Instructions..................................................9
4 Installation........................................................................ 11
4.1 Unit Inspection .....................................................................11
4.2 Location ...............................................................................12
4.3 Piping Work..........................................................................13
4.4 Condensate Removal...........................................................15
4.5 Ductwork..............................................................................16
4.6 Electric Heater .....................................................................16
4.7 Electrical Installation ............................................................19
5 Installation Check and Trial Run .................................... 24
5.1 Checking Items after Installation ..........................................24
5.2 Trial Run ..............................................................................24
6 Common Malfunction and Elimination .......................... 25
7 Maintenance and Care..................................................... 27
7.1 Drain Pipe ............................................................................27

7.2 Notice before Seasonal Use.................................................27
7.3 Maintenance after Seasonal Use .........................................27
7.4 Parts Replacement...............................................................28
8 After-Sales Service .......................................................... 28
This marking indicates that this product should not be disposed with other household
wastes throughout the EU. To prevent possible harm to the environment or
human health from uncontrolled waste disposal, recycle it responsibly to
promote the sustainable reuse of material resources. To return your used
device, please use the return and collection systems or contact the retailer
where the product was purchased. They can take this product for
environmental safe recycling.

Air Handlers
1
1 Safety Precautions
This product can’t be installed at corrosive, inflammable or explosive environment
or the place with special requirements, such as kitchen. Otherwise, it will affect the
normal operation or shorten the service life of the unit, or even cause fire hazard or
serious injury. As for above special places, please adopt special air conditioner with
anti-corrosive or anti-explosion function.
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 the kits or accessories when installing. Follow
all safety codes. Wear safety glasses, protective clothing, and work gloves. Use
quenching cloth for brazing operations. Have 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 National Electrical Code (NEC)
for special requirements. Recognize safety information. This is the safety--alert
symbol .
When you see this symbol on the unit and in instructions or manuals, be alert to the
potential for personal injury. Understand these signal words: DANGER, WARNING,
CAUTION and NOTICE. These words are used with the safety--alert symbol.
Indicates a hazardous situation that, if not avoided, will result in
death or serious injury.
Indicates a hazardous situation that, if not avoided, could result
in death or serious injury.
Indicates a hazardous situation that, if not avoided, may result
in minor or moderate injury.
Indicates important but not hazard-related information, used to
indicate risk of property damage.

Air Handlers
2
Electrical shock hazard:
Failure to follow this warning could result in personal injury or death.
Before installing, modifying, or servicing system, main electrical disconnect switch
must be in the OFF position. There may be more than 1 disconnect switch. Lock out
and tag switch with a suitable warning label.
PROPOSITION 65:
Respirable particles of fiberglass are known to State of California to cause cancer.
This appliance contains fiberglass insulation.
California Proposition 65 warnings are required for certain products, which are not
covered by the OSHA standards. All manufacturer products meet current federal OSHA
Guidelines for safety.
Products that contain or produce any of the more than 600 listed chemicals known
in California can cause cancer or birth defects, such as fiberglass insulation, lead in
brass and natural gas combustion products. Warnings are issued for such products
sold in California as required by California Proposition 65.
All “new equipment” shipped for sale in California will have labels stating that the
product contains and /or produces Proposition 65 chemicals. We cannot always know
“when, or if” products will be sold in the California market. Although we have not
changed our processes, having the same label on all our products facilitates
manufacturing and shipping.
All phases ofthis installation must conform toNATIONAL, STATE AND LOCAL
CODES. If it is required for additional information,please contact your local distributor.
The unit must be permanently grounded. Failure to do so can lead to electrical
shock causing personal injury or death.
The material of plenum and ductwork must meet the standard NFPA 90B.
The supply air plenum or duct must have a solid sheet metal bottom piece directly
after the air handler unit with no openings, registers or flexible air ducts located in it.
The first 6 inches of supply air plenum and ductwork must be constructed of sheet

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metal as required by NFPA 90B. Metal plenum of duct may be connected to the
non-combustible floor base for downflow. Exposing combustible non-metal. material to
the supply opening of a downflow unit can cause a fire resulting in property damage,
personal injury or death. If flexible supply air ducts are used they may be located only in
the side walls of the rectangular plenum, a minimum of 6 inches from the solid bottom.
2 Product Introduction
2.1 Product Description
The NORTEK air handler offer the perfect combination of superior product
quality, operating efficiency, operating sound levels and value for money. The
condensing unit uses the environmentally friendly refrigerant R410A, which is
chlorine-free to help prevent damage to the ozone layer.
2.2 Optional Accessories
Indoor unit accessories
No.
Name
Appearance
Q'ty
Usage
1 Throw-over
pipe
1
Connect the unit
with the liquid
pipe
2 Throw-over
pipe
1
Connect the unit
with the gas
pipe

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2.3 Physical Dimension
Unit: inch(mm)
Model
Dimension
W
D
H
A
B
GMH24-36MSK4DH1
21-1/4(540) 21-1/4(540) 48-1/4(1224) 11-5/8(295) 20(508)
24-3/4(630) 21-1/4(540) 57(1448) 11-5/8(295) 20(508)
GMH48-60MSK4DH1