Mrcool MPGXSXM414A User Manual

The Signature Series is NOT designed for amateur installation. Installation SHOULD be performed by an authorized technician.

Please read this manual carefully before installation and keep it for future reference.

Owner & Installation

Manual

Signature Series

MPG*S*M414A Residential Package

The Signature Series is NOT designed for amateur installation. Installation SHOULD be performed by an authorized technician.

Please read this manual carefully before installation and keep it for future reference.

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

WARNING

If this unit is to be installed in a mobile or manufactured
home application, the duct system must be sized to
achieve static pressures within the manufacturer’s
guidelines. All other installation guidelines must also
be followed. Failure to do so may result in equipment
damage, personal injury, and improper performance of
the unit.

INSTALLATION AND MAINTENANCE

INSTRUCTIONS

MPG*S*M414A SERIES UNITS

RESIDENTIAL PACKAGED UNITS

Gas/Electric
507295-02C
4/2019

Table of Contents

Installation ...................................................................2

Venting.........................................................................4

Duct System ................................................................5

Filters...........................................................................5

Condensate Drain........................................................5

Gas Piping...................................................................6

Electrical Wiring ..........................................................7

Heating Start-Up .........................................................8

Operation...................................................................10

Maintenance..............................................................11

WARNING

Do not store combustible materials, including gasoline

vent pipe, or warm air ducts. Such actions could cause
property damage, personal injury, or death.

WARNING

Improper installation, adjustment, alteration, service, or
maintenance can cause injury or property damage. Refer
to this manual. For assistance or additional information,
consult a licensed professional (or equivalent), HVAC
installer, service agency, or the gas supplier.

Manufactured By

MRCOOL LLC

Hickory, KY 42051

*F507295-C*

(P) 507295-02C

CAUTION

The installation of the unit, wiring, warm air ducts, venting, etc. must conform to the requirements of the National Fire
Protection Association; the National Fuel Gas Code, ANSI Z223.1 (latest edition) and the National Electrical Code, ANSI/
NFPA No. 70 (latest edition) in the United States; the Canadian Installation Codes CAN/CGA-B149.1 & .2 (latest edition)
and the Canadian Electrical Code Part 1, CSA 22.1 (latest edition) in Canada; and any state or provincial laws, local
ordinances, or local gas utility requirements. Local authorities having jurisdiction should be consulted before installation
is made. Such applicable regulations or requirements take precedence over the general instructions in this manual.

Save these instructions for future reference

507295-02C Page 1 of 13mrcool.com

Installation

These instructions must be saved for future reference.

These units are single package air conditioners with gas
heat designed for outdoor installation on a rooftop or a
slab.

Inspection

As soon as the unit is received, it should be inspected
for possible damage during transit. If damage is evident,
the extent of the damage should be noted on the carrier’s
freight bill. A separate request for inspection by the carrier’s
agent should be made in writing.

The units are completely assembled. All piping, refrigerant
charge, and electrical wiring are factory installed and
tested. The units require only electric power, gas piping,
condensate drain, and duct connections, plus installation
of the vent cover at the point of installation.

If components are to be added to a unit to meet local codes,
they are to be installed at the dealer’s and/or customer’s
expense.

The size of unit for the proposed installation should be
based on heat loss/heat gain calculation made according
to the methods of Air Conditioning Contractors of America
(ACCA).

WARNING

In the State of Massachusetts:

This product must be installed by a licensed Plumber

maximum length shall not exceed 36”. When lever-type
gas shutoffs are used, they shall be T-handle type.

These installation instructions are intended as a

contractor.

Inc.:

• For use as a forced air furnace with cooling unit.

• For outdoor installation only.

• For installation on combustible material.

• For use with natural gas or propane gas. (Conversion
kit required for propane gas application.)

These units are not suitable for use with conventional
venting systems.

Location

Use the following guidelines to select a suitable location
for these units.

1. Unit is designed for outdoor installation only. Unit must
be installed so all electrical components are protected
from water.

2. Condenser coils must have an unlimited supply of air.

3. For ground level installation, use a level prefabricated
pad or use a level concrete slab. Do not tie the slab to
the building foundation.

4. Maintain level within a tolerance of 1/4” maximum
across the entire length or width of the unit.

CAUTION

5. Do not locate the unit where the combustion air supply
will be exposed to any of the following substances:

• Permanent wave solutions

• Chlorinated waxes and cleaners

• Chlorine-based swimming pool chemicals

• Water softening chemicals

• Deicing salts or chemicals

• Carbon tetrachloride

• Halogen-type refrigerants

• Cleaning solvents (such as perchloroethylene)

• Printing inks, paint removers, varnishes, etc.

• Cements and glues

• Antistatic fabric softeners for clothes dryers

• Masonry acid washing materials

• Chlorinated laundry products

• Hydrochloric acid

Page 2 of 13 507295-02Cmrcool.com

Clearances

All units require certain clearances for proper operation
and service. Refer to Table 1 for the minimum clearances
to combustibles, servicing, and proper unit operation. In

made from wood or class A, B, or C roof covering material.

Units must be installed outdoors.

Do not permit overhanging structures or shrubs to
obstruct condenser air discharge outlet, combustion
air inlet, or vent outlet.

Clearance to

Combustibles

Front of unit 0 in. 24 in.

Back of unit 0 in. 0 in.

Left side 0 in. 24 in.

Right side (from
vent hood)

Base of unit 0 in. 0 in.

Top of unit 0 in. 48 in.

temperatures. For any future service, installer must provide
access to screws of top and rear panels.

12 in. 24 in.

Clearance for

Service Access

Table 1. Minimum Clearances

Roof Curb Installation

If a roof curb is used, follow the manufacturer’s Installation
Instructions and be sure that all required clearances are
observed (see Clearances section).

Rigging Unit

Exercise care when moving the unit. Do not remove any
packaging until the unit is near the place of installation.
An optional lifting lug kit may be purchased separately for
use in rigging the unit for lifting. Spreaders whose length
exceeds the unit depth dimension by 6 inches MUST be
used across the top of the unit.

Units may also be moved or lifted with a forklift while still in
the factory supplied packaging. The lengths of the forks

of the forklift must be a minimum of 42 inches.

Figure 1.

CAUTION

Before lifting a unit, make sure that the weight is
distributed equally on the cables so that it will lift evenly.

Unpacking

Carefully remove outer packaging material and discard.
Locate the four (4) shipping brackets that attached the
unit to the wood pallet and remove. Locate the supply duct
corner and seal the shipping openings in the base from
the underside with silicone or other approved sealant to
prevent air leakage during unit operation.

Service Access

Access to all serviceable components is provided by four
removable panels: upper access panel (for blower, ID coil,

panel, and compressor access.

CAUTION

As with any Mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.

507295-02C Page 3 of 13mrcool.com

WARNING

This unit is charged with HFC-410A refrigerant.
Operating pressures for units charged with HFC-410A
are higher than pressures in units charged with HCFC-

22. All service equipment MUST be rated for use with
HFC-410A refrigerant.

Venting

The vent outlet must be installed in a location as to prevent
building degradation and must be consistent with the
National Fuel Gas Code, Z223.1 or CAN/CGA-B149.1 &
.2.

The products of combustion are discharged through
a screened opening on the gas heat side panel. The
horizontal vent system shall terminate at least 4 feet below,
4 feet horizontally from, or 1 foot above any door, window,
or gravity air inlet into the building. The vent system shall
terminate at least 3 feet above any forced air inlet located
within 10 feet.

The unit shall be installed in a manner such that snow

Minimum horizontal clearance of 4 feet from electric meters,
gas meters, regulator, and relief equipment is required.

In addition to the above requirements, consideration must
be given to prevent unwanted ice buildup from the vent
condensate. The vent should not be located on the side of
a building where the prevailing winter winds could trap the
moisture, causing it to freeze on the walls or on overhangs
(under eaves). The vent should not be located over a
sidewalk, patio, or other walkway where the condensate
could cause the surface to become slippery.

The products of combustion must not be allowed to

be recirculated.

Vent Hood Installation

The unit is shipped with the vent hood inside the control
compartment. Locate the vent hood and attach to side of
utility panel with screws provided in the instruction bag
(see Figure 2).

NOTE:

If an existing gas furnace is being removed from a
common venting system when this packaged unit is
installed, then read and follow the instructions in the
“Removal of Unit from Common Venting System” section
that follows. Otherwise, you may skip this section.

Removal of Unit from Common Venting System

When an existing furnace is removed from a common
venting system serving other appliances, the venting
system is likely to be too large to properly vent the
remaining attached appliances. The following test
should be conducted with each appliance while the other
appliances connected to the common venting system are
not in operation.

1. Seal any unused openings in the common venting
system.

2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage

which could cause an unsafe condition.

3. Insofar as is practical, close all building doors and
windows between the space in which the appliances
remaining connected to the common venting system
are located and other spaces in the building. Turn on
clothes dryers and any appliance not connected to the
common venting system. Turn on exhaust fans, such
as range hoods and bathroom exhausts, so they will
operate at maximum speed. Do not operate a summer

4. Following the lighting instructions, place the unit being
inspected in operation. Adjust the thermostat so the
appliance will operate continuously.

5. Test for spillage at the draft control relief opening after

6. Follow the preceding steps for each appliance

7. After it has been determined that each appliance

8. If improper venting is observed during any of the

Figure 2. Installing the Vent Cover

Page 4 of 13 507295-02Cmrcool.com

a match or candle.

connected to the common venting system.

remaining connected to the common venting system
properly vents when tested as outlined above, return

and any other fuel burning appliance to their previous
condition of use.

above tests, the common venting system must be
corrected. See National Fuel Gas Code, ANSI Z223.1
(latest edition) or CAN/CGA B149.1 & .2 Canadian
Installation Codes to correct improper operation of
common venting system.