For 13 SEER R410A Unitary
Ducted Split AC & Heat Pump
Residential Air Conditioners & Heat Pumps
Installation Manual
Thank you for choosing Residential Air Conditioners & Heat Pumps, please read this
Installation manual carefully before operation and retain it for future reference.
MRCOOL reserves the right to interpret this manual which will be subject to any change due
to product improvement without further notice.
Contents
Safety Considerations ...................................................................................1
1. Unit Parts Arrangement .............................................................................2
2. Physical Dimension ...................................................................................3
2.1 Outdoor Unit ..........................................................................................3
2.2 Installation Clearance Data ...................................................................5
2.3 Units Installation ....................................................................................5
2.4 Installation Recommendations .............................................................6
3. Brazing Connections .................................................................................7
3.1 Preparation the Line .............................................................................7
3.2 Cap and Core Removal ......................................................................... 8
3.3 Attach Gauge ......................................................................................... 8
3.4 Braze Line Set ....................................................................................... 8
3.5 Preparation for Next Step ...................................................................... 9
4. Check Piston .............................................................................................9
5. Operating Gauge Set and Service Valves ...............................................10
5.1 Torque Requirements ..........................................................................10
5.2 Using Manifold Gauge Set ..................................................................10
5.3 Operating Service Valves ...................................................................10
5.4 Operating Angle Type Service Valve ...................................................10
5.5 To Access Service Port ........................................................................ 11
5.6 Reinstall Stem Cap .............................................................................. 11
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5.7 Install Liquid Line Filter Drier Indoor ................................................... 11
6. Recovering Refrigerant from Existing System ......................................... 12
6.1 Disconnect Power ...............................................................................12
6.2 Connect Manifold Gauge Set ..............................................................12
6.3 Recovering Refrigerant .......................................................................12
6.4 Leak Test Line Set and Indoor Coil......................................................13
6.5 Evacuating Line Set and Indoor Coil ...................................................14
7. Electrical .................................................................................................. 15
7.1 Size Circuit And Install Disconnect Switch ..........................................16
7.2 Install Thermostat ................................................................................ 16
7.3 Unit Low Voltage Connections ............................................................16
7.4 Unit High Voltage Connections ............................................................ 17
8. System Refrigerant .................................................................................. 21
8.1 Gauge Set (Cooling Only) ...................................................................21
8.2 Gauge Set (Heat Pump) ..................................................................... 22
8.3 Weigh In ..............................................................................................23
9. Unit Control............................................................................................27
9.1 Mainboard Description ......................................................................27
9.2 Terminal Description .......................................................................... 28
9.3 Control Flowchart ..............................................................................29
9.4 Error Analysis ....................................................................................30
9.5 Setting on Defrost Control PCB (for Heat Pump unit only) ............... 33
9.6 Manually Defrost Cycle ....................................................................33
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1
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. Instructions for installation and use of this product are provided by the manufacturer.
Installation must be performed in accordance with the requirements of NEC and CEC by qualied
installer or agency only. 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, and CAUTION. These words are used with
the safety--alert symbol. DANGER identies 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.
WARNING
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.
This product must not be disposed together with the domestic waste.
This product has to be disposed at an authorized place for recycling of
electrical and electronic appliances.
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1. Unit Parts Arrangement
Cooling Only Condensing Unit
Low pressure switch
High pressure switch
Compressor harness
Compressor
Filter
Liquid line service valve
Vapor line service valve
Fig.1
Heat Pump Condensing Unit
High pressure switch
Low pressure switch
Revesing valve
Compressor harness
Compressor
Throttle
Nozzle for adding freon
Liquid line service valve
Filter
Vapor line service valve
Fig.2
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2. Physical Dimension
2.1 Outdoor Unit
H
D
W
Fan motor
Axial flow fan
Compressor
Fig.3—Outdoor Unit
Table 1—Dimension of Outdoor Unit
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Unit: Inch (mm)
MODEL
DIMENSION
H D W
MAC13018 24"(610)
21-1/2"(546) 21-1/2"(546)
MAC13024 24-1/2"(620) 24"(610) 24"(610)
MAC13030 29"(735) 24"(610) 24"(610)
MAC13036 29"(735) 28"(710) 28"(710)
MAC13042 29"(735) 28"(710) 28"(710)
MAC13048 29"(735) 28"(710) 28"(710)
MAC13060 33-1/2"(850) 29-1/2"(750) 29-1/2"(750)
MHP13018 24-1/2"(620) 24"(610) 24"(610)
MHP13024 24-1/2"(620) 24"(610) 24"(610)
MHP13030 29"(735) 28"(710) 28"(710)
MHP13036 29"(735) 28"(710) 28"(710)
MHP13042 29"(735) 28"(710) 28"(710)
MHP13048 33-1/2"(850) 28"(710) 28"(710)
MHP13060 33-1/2"(850) 29-1/2"(750) 29-1/2"(750)
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2.2 Installation Clearance Data
>1000mm
>1000m
（40inch）
（40inch）
（32inch）
（120inch）
（40inch）
（40inch）
m
>800mm
>3000mm
>1000mm
>1000mm
Floor
Floor
Fig.4
2.3 Units Installation
2.3.1 Installation Positions of Condensing Units
● Outdoor Unit must be xed on stable and solid surface of oor.
● Don’t install Outdoor Unit under window or between buildings, and prevent the operation
noise from room.
● There should be no obstructions at both air inlet and outlet of indoor and outdoor units for
maintaining well air ventilation.
● When installing indoor unit, make sure that the hanging parts at top are strong enough to
stand the weight of unit.
2.3.2 Matters Need Attention
● Before installation, make sure that the power supply comply with nameplate and check the
security of the power supply.
● Do not use or place combustible and explosive gas or liquid near the air conditioner.
● Do not attempt to install Air Conditioner by yourself to guarantee the air Conditioner can be
permanent use.
● In the event of malfunction(burning smell, etc.),stop operation immediately and turn off the
power switch.
● Do not insert ngers or objects into the outlet port or inlet grillers.
● Do not check or repair the air Conditioner when it is running.
● Do not sprinkle water on the air Conditioner or operate it with wet hands.
● Do not climb or place objects on the air conditioner.
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2.4 Installation Recommendations
NOTE: In some cases noise in the living area has been traced to gas pulsations from improper
installation of equipment.
1). Locate unit away from windows, patios, decks, etc. where unit operation sound may disturb
customer.
2). Ensure that vapor and liquid tube diameters are appropriate for unit capacity.
3). Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends.
4). Leave some slack between structure and unit to absorb vibration.
5). When passing refrigerant tubes through the wall, seal opening with RTV or other pliable
silicon--based caulk.(See Fig. 5.)
6). Avoid direct tubing contact with water pipes, duct work, oor joists, wall studs, oors, and
walls.
7). Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap which comes
in direct contact with tubing. (See Fig. 5.)
8). Ensure that tubing insulation is pliable and completely surrounds vapor tube.
9). When necessary, use hanger straps which are 1 in. wide and conform to shape of tubing
insulation. (See Fig. 5.)
10). Isolate hanger straps from insulation by using metal sleeves bent to conform to shape of
insulation.
When outdoor unit is connected to factory--approved indoor unit, outdoor unit contains system
refrigerant charge good for 25 ft.
For proper unit operation, check refrigerant charge using charging information located on
control box cover and/or in the Check Charge section of this instruction.
NOTE: Avoid contact between tubing and structure
OUTDOOR WALL
CAULK
INDOOR WALL
LIQUID TUBE
INSULATION
VAPOR TUBE
JOIST
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
THROUGH THE WALL
INSULATION
VAPOR TUBE
LIQUID TUBE
SUSPENSION
1”MIN.
Fig.5 – Connecting Tubing Installation
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3. Brazing Connections
3.1 Preparation the Line
Refer to Table 2 for eld tubing diameters. The pipe must remain round. Do not crimp end of
the line.
Table 2. Refrigerant Line Set Inches (mm)
Model
Valve Field Connections
Liquid Line Vapor Line
MAC13018
3/8 in. (9.5 mm)
5/8 in. (16 mm)
MHP13018
MAC13024
MHP13024
MAC13030
3/4 in. (19 mm)
MHP13030
MAC13036
MHP13036
MAC13042
7/8 in. (22 mm)
MHP13042
MAC13048
MHP13048
MAC13060
1/2 in. (12 mm) 1-1/8 in. (28 mm)
MHP13060
Line set size matches
service valve connection
Do not crimp service valve connector
whenpipe is smaller than connection
Fig.6
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3.2 Cap and Core Removal
Remove service cap and core from both the vapor and liquid line service ports.
Service port core
Service port cap
Liquid line
service valve
Vapor line
service valve
Service port core
Service port cap
Fig.7
3.3 Attach Gauge
Flow regulated nitrogen (at 1 to 2 psig) through the low−side refrigeration gauge set into the
liquid line service port valve, and out of the vapor line service port valve.
Liquid line
Use regulator to flow
nitrogen at 1 to 2 psig
Liquid line service valve
Vapor line service valve
Vapor service port must be open
to allow exit point for nitrogen
Vapor line
OUTDOOR
UNIT
INDOOR
UNIT
Fig.8
3.4 Braze Line Set
To help protect service valve seals during brazing,wrap water saturated cloths around
service valve bodies and copper tube stubs. Water saturated cloths must remain water saturated
throughout the brazing and cool−down process.
Braze line to the service valve.
When brazing line set to
service valves, point flame
away from service valve.
Water saturated
cloth
Fig.9
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3.5 Preparation for Next Step
After all connections have been brazed, disconnect manifold gauge set from service ports.
Apply water saturated cloths to both services valves to cool piping. Once piping is cool, remove all
water saturated cloths.Reinstall service cap and core.Refer to the unit installation instructions for
the next step in preparing the unit.
4. Check Piston
There is a piston located in outdoor condensing unit, please verify the piston size based on the
below table. When matching with air handler, please make sure replace this piston in air handler.
Table 3
OUTDOOR UNIT INDOOR UNIT PISTON KIT PART NO.
MAC13018 MAH13018 053
MAC13024 MAH13024 054
MAC13030 MAH13030 064
MAC13036 MAH13036 067
MAC13042 MAH13042 071
MAC13048 MAH13048 079
MAC13060 MAH13060 084
MHP13018 MAH13018 055
MHP13024 MAH13024 057
MHP13030 MAH13030 068
MHP13036 MAH13036 067
MHP13042 MAH13042 073
MHP13048 MAH13048 082
MHP13060 MAH13060 091
Liquid line orifice housing
Distributor assembly
Fixed orifice
Teflon ring
Liquid line assembly
(includes strainer)
Liquid line
Brass nut
Vapor line
Fig.10
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