MRCOOL HAC13018FA Series Split System Air Conditioner

Product Usage Instructions

• Read the safety precautions carefully before using the air conditioner. Incorrect usage may cause serious damage or injury. Follow all warnings and cautions mentioned in the manual to prevent accidents.
• Before installation, ensure you have read and understood the installation preparation section in the manual. Proper installation is crucial for the efficient operation of the air conditioner.
• Refer to the refrigerant section for important information regarding refrigerant handling and usage. It is essential to follow the guidelines provided to prevent damage to the system.
• Understand the electrical requirements outlined in the manual before connecting the air conditioner to the power supply. Failure to follow electrical guidelines may result in damage to the unit.
• Adjusting the system charge is critical for optimal performance. Follow the specified methods for charging the system provided in the manual.
• Refer to this section for information on operating the air conditioner and troubleshooting common issues. Understanding how the system operates will help in maintaining its efficiency.
• After installation, follow the post-installation guidelines to ensure that the air conditioner is functioning correctly. Regular maintenance is key to prolonging the life of the unit.

Safety Precautions

Read Before Using

Incorrect usage may cause serious damage or injury.
The symbols below are used throughout this manual to indicate instructions that should be followed closely or actions that should be avoided to prevent death, injury, and/or property damage.

• WARNING: Indicates the possibility of personal injury or loss of life.
• CAUTION: Indicates the possibility of property damage or serious consequences.

WARNING

1. Failure to follow these warnings could result in property damage, severe personal injury, or death.
   Disconnect all electrical power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized.
2. Any attempt to repair a central air conditioning product may result in property damage, severe personal injury, or death. These units use These units use R-410a refrigerant which operates at 50% to 70% higher pressures than R-22. Use only R-410a-approved service types of equipment. Refrigerant cylinders are painted a “Rose” color to indicate the type of refrigerant and may contain a “dip” tube to allow for charging of liquid refrigerant into the system. All R-410A systems use a POE oil (VG74 or equivalent) that readily absorbs moisture from the atmosphere. To limit this ‘hygroscopic“ action, the system should remain sealed whenever possible. If a system has been open to the atmosphere for more than 4 hours, the compressor oil must be replaced. Never break a vacuum with air and always change the driers when opening the system for component replacement.
3. Grounding is essential before connecting the electrical supply.
4. Turn valve stem counterclockwise only until the stem contacts the rolled edge. No torque is required.
   Failure to follow this warning will result in the abrupt release of the system charge and may result in personal injury and/or property damage.
5. Brazing required. Failure to inspect lines or use proper service tools may result in equipment damage or personal injury. If using existing refrigerant lines, ensure all joints are brazed, not soldered.

CAUTION

1. This information is intended for use by individuals possessing adequate background electrical and mechanical experience. Any attempt to repair a central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.
2. Failure to follow proper procedures can result in personal illness or injury or severe equipment damage.
   Systems contain oil and refrigerant under high pressure. Recover refrigerant to relieve pressure before opening a system.
3. Failure to inspect or use proper service tools may result in equipment damage or personal injury.
   Reconnect all grounding devices. All parts of this product that are capable of conducting electrical current are grounded. If grounding wires, screws, straps, clips, nuts, or washers used to complete a path to the ground are removed for service, they must be returned to their original position and properly fastened.
4. Do not touch the top of the compressor, as it may cause minor to severe burning.

INSTALLATION PREPARATION

Unit Dimensions
The unit’s weight value is on the cardboard box. When mounting the outdoor unit on a roof, ensure the roof will support the unit’s weight. Properly selected isolation is recommended to prevent sound or vibration transmission to the building structure.

Unit Dimensions
Model	Height (in.)	Width (in.)	Length (in.)
18/24	24-15/16	23-5/8	23-5/8
30	24-15/16	28	28
36	24-15/16	29-1/8	29-1/8
42/48	33-3/16	28	28
60	33-3/16	29-1/8	29-1/8

Location Restrictions

• Ensure the top discharge area is unrestricted for at least 60 inches above the unit.
• Do not place outdoor units near bedrooms since normal operational sounds may be objectionable.
• Position the unit to allow adequate space for unobstructed airflow, wiring, refrigerant lines, and serviceability.
• Maintain a distance of 24 inches between units.
• 24 inches clearance must be provided in front of the control box (access panels) and any other side requiring service.
• Position the unit where water, snow, or ice from the roof or overhang cannot fall directly on the unit.
• Position the outdoor unit a minimum of 12″ from any wall or surrounding shrubbery to ensure adequate airflow. See Figures 2.2 and 2.3.
• Units should be elevated 3-12 inches above the pad or rooftop, depending on local weather. This additional height will allow drainage of snow and ice melted during the defrost cycle prior to its refreezing. Ensure that drain holes in unit base pan are not obstructed, preventing drainage of defrost water (Fig. 2.4).
• If possible, avoid locations that are likely to accumulate snow drifts. If not possible, a snow drift barrier should be installed around the unit to prevent a build-up of snow on the sides of the unit.

Pre-Installation Steps

• STEP 1 – Check for damage and report promptly to the carrier any damage found to the unit.
• STEP 2 – Instruments must be designed to install/serve R410A equipment.
• Gauge sets, hoses, refrigerant containers, and recovery systems must be designed to handle the POE-type oils.
• Manifold sets should be 800 PSIG high side and 250 PSIG low side.
• All hoses must have a 700 PSIG service pressure rating.
• Leak detectors should be designed to detect R410a.
• Recovery equipment (including refrigerant recovery containers) must be specifically designed to handle R410a.
• Do not use R22 TXV.

Pad Installation

When installing the unit on a support pad, such as a concrete slab, consider the following:

• The pad must be at least 1-2″ larger than the unit on all sides.
• The pad must be separate from any structure.
• The pad must be level.
• The pad must be high enough above grade to allow for drainage.
• The pad location must comply with National, State, and Local codes.

NOTE
These instructions are intended to provide a method to tie down the system to the concrete slab as a securing procedure for high wind areas. Check local codes for tie-down methods and protocols

REFRIGERANT

Service Valve Connection Sizes

Models	Suction Line Connection	Liquid Line Connection
18/24/30/36/42	3/4	3/8
48/60	7/8

Refrigerant Line Sizes

Model	Suction Line		Liquid Line
	Optional	Standard	Optional	Standard
18/24/ 30/36/ 42	5/8	3/4	5/16	3/8
48	3/4	7/8	1/2
60	7/8	1-1/8	1/2

Refrigerant Piping Limits & Required Refrigerant Line Length

Model	Liquid Line (inches)	Total Equivalent Length (Feet)
		25	50	75	100	125	150
		Maximum Vertical Length (Feet)
18	5/16	25	50	40	30	NA	NA
	3/8	25	50	45	40	NA	NA
24	5/16	25	40	30	20	NA	NA
	3/8	25	50	45	40	NA	NA
30	5/16	25	40	40	30	NA	NA
	3/8	25	50	50	50	NA	NA
36	5/16	25	50	40	30	NA	NA
	3/8	25	50	50	50	NA	NA
42	5/16	25	23	4	NA	NA	NA
	3/8	25	50	43	36	30	24
48	1/2	25	50	56	55	40	30
	3/8	25	46	38	30	22	15
60	1/2	25	50	60	60	40	30
	3/8	25	50	56	44	32	20

Model	Suction (inches)	Total Suction Line Length
		25	50	100	150
		Coefficient
18	5/8	1.00	0.97	0.94	NA
	3/4	1.00	0.98	0.95	NA
24	5/8	1.00	0.97	0.94	NA
	3/4	1.00	0.98	0.95	NA
30	5/8	1.00	0.97	0.94	NA
	3/4	1.00	0.98	0.96	NA
36	5/8	1.00	0.97	0.94	NA
	3/4	1.00	0.99	0.97	NA
42	5/8	1.00	0.98	0.95	0.91
	3/4	1.00	0.98	0.97	0.96
48	3/4	1.00	0.98	0.95	0.92
	7/8	1.00	0.98	0.97	0.96
60	7/8	1.00	0.98	0.94	0.90
	1-1/8	1.00	0.99	0.98	0.97

NOTE

Using a suction line larger than shown in the chart will result in poor oil return and is not recommended. For example: the system capacity published in AHRI is 17800 BTU/H. This data is based on the AHRI test condition and 25 feet line set with standard suction tube size (3/4″ tube). If you need to add the line set more than 25 feet or use the optional suction tube size, you need to recalculate the capacity with the coefficient in the table.
For 50 feet line and 5/8″ suction tube, the capacity will be 17800*0.97=17266 BTU/H.

Determine the required line length and lift. You will need this information later.

• Total line length = _______________ feet
• Total vertical change (lift) = _______________ feet

Refrigerant Line Insulation

NOTE
The suction line must always be insulation. DO NOT allow the Liquid Line and Suction Line to come in direct (metal to metal) contact.

Existing Refrigerant Line Reuse

CAUTION
If using existing refrigerant lines, make certain that all joints are brazed, not soldered.
For retrofit applications, where the existing refrigerant lines will be used, the following precautions should be taken:

• Ensure that the size of the refrigerant lines is correct.
• Ensure that the refrigerant lines are free of leaks, acid, and oil.

NOTE
It is recommended to install only approved matched indoor and outdoor systems. All of the manufacturer’s systems have been AHRI-certified.
Some of the benefits of installing approved matched indoor and outdoor split systems are maximum efficiency, optimum performance, and the best overall system reliability.

Line Routing

NOTE
Take precautions to prevent noise within the building structure due to vibration transmission from the refrigerant lines. For example:

• When the refrigerant lines have to be fastened to floor joists or another framing in a structure, use isolation-type hangers.
• Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings.
• Where the refrigerant lines run through a wall or sill, they should be insulated and isolated.
• Isolate the lines from all ductwork.
• Minimize the number of 90° turns.
• Use PVC piping as a conduit for all underground installations. Buried lines should be kept as short as possible.
• The lines should not obstruct service access to the coil, air handling system, or filter.
• Care must also be taken to isolate the refrigerant lines to minimize noise transmission from the equipment to the structure.
• Comply with national, state, and local codes when isolating linesets from joists, rafters, walls, and other structural elements.

Line Brazing

1. Remove caps or plugs. Use a deburring tool to debut the pipe ends. Clean both the internal and external surfaces of the tubing using an emery cloth.
2. Remove the pressure tap cap from both service valves.
3. Purge the refrigerant lines and indoor coil with dry nitrogen.
4. Wrap a wet cloth around the valve body to avoid heat damage and continue the dry nitrogen purge. (Figure 3.13).
   Braze the refrigerant lines to the service valves.
   Check the liquid line filter drier’s directional flow arrow to confirm the correct direction of refrigeration flow (away from the outdoor unit and toward the evaporator coil) as illustrated. Braze the filter drier to the liquid line. Continue the dry nitrogen purge. Do not remove the wet rag until all brazing is completed.
   NOTE
   Remove the wet cloth before stopping the dry nitrogen purge.
5. Replace the pressure tap caps after the service valves have cooled.

NOTE
Do not over-tighten (between 40 and 60 inch-lbs. maximum).

Leak Check

1. Pressurize the refrigerant lines and evaporator coil to 150 PSIG using dry nitrogen.
2. Check for leaks by using a soapy solution or bubbles at each brazed location.
3. Remove nitrogen pressure and repair any leaks before continuing.

Evacuation
NOTE
Do not open the service valves until the refrigerant lines and indoor coil leak check and evacuation are complete.

1. Evacuate until the micron gauge reads no higher than 350 microns, then close off the valve to the vacuum pump.
2. Observe the micron gauge. Evacuation is complete if the micron gauge does not rise above 500 microns in one (1) minute.
   Once evacuation is complete, blank off the vacuum pump and micron gauge, and close the valves on the manifold gauge set.

Opening the Service Valves
WARNING
Exercise extreme caution when opening the liquid line service valve. Turn counterclockwise until the valve stem just touches the rolled edge. No torque is required. Failure to follow this warning will result in the abrupt release of the system charge and may result in personal injury and/or property damage.
NOTE
Leak check and evacuation must be completed before opening the service valves.

1. Remove the service valve cap. (Figure 3.15)
2. Fully insert the hex wrench into the stem and back out counterclockwise until the valve stem just touches the rolled edge.
3. Replace the valve stem cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.

ELECTRICAL

• The following table defines the maximum total length of low-voltage wiring from the outdoor unit to the indoor unit and to the thermostat.

24 Volts – Wire Size	Maximum Wire Length
18 AWG	150 ft.
16 AWG	225 ft.
14 AWG	300 ft.

Low Voltage Wiring Diagrams

• Air Handler Hook-up Diagram

Notes:

• “—–” – The electric auxiliary heat connection (optional)
• W – Electric auxiliary heat signal
• W1 – First electric auxiliary heat signal
• W2 – Second electric auxiliary heat signal

WARNING

Low voltage line must be connected inside the outdoor unit case through the control wiring channel on the right. High voltage line must be connected through the power wiring channel on the left. A mixed channel may result in personal injury.

1. During installation or maintenance, do not cut the tie of the rubber ring on the electric control box with scissors. It can be untied by pressing the loose buckle. The tightening belt can be reused.
2. After installation or maintenance, the tightening belt shall be tightened, and should not be loosened or discarded.
   The control box access panel must be installed and the screws must be tightened.

High Voltage Power Supply

WARNING
During installation, testing, servicing, and troubleshooting of this product, it may be necessary to work with live electrical components.
Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.
The high-voltage power supply must agree with the equipment nameplate. Power wiring must comply with National, State, and Local codes. Follow the instructions on the unit wiring diagram located on the inside of the access panel.

High Voltage Disconnect Switch
Install a separate disconnect switch at the outdoor unit. Field-provided flexible electrical conduit must be used for high-voltage wiring.

High Voltage Ground

• Ground the outdoor unit per national, state, and local code requirements.

Start-Up

1. Ensure all previous sections have been completed.
2. Set System Thermostat to OFF.
3. Turn on power to the indoor and outdoor units at the disconnect switch.
4. Wait one (1) hour before starting the unit if the compressor crankcase heater is used and the outdoor ambient temperature is below 70°F.
5. Set the system thermostat to ON.

SYSTEM CHARGE ADJUSTMENT

Charging: Weigh-In Method
The Weigh-In method can be used for the initial installation or any time a system charge is being replaced. The Weigh-In method can also be used when power is not available at the equipment site or operating conditions (indoor/outdoor temperatures) are not in range to verify with the suction line pressure charging method.

Model	Factory Charge	Charge Multiplier for Liquid Line Length
18 AWG	150 ft.	5/16″	3/8″	1/2″
16 AWG	225 ft.	0.4 oz/ft	0.6 oz/ft	1.2 oz/ft

NOTE
The factory charge in the outdoor unit is sufficient for 15 feet of standard-size interconnecting liquid line.

New installations:
Calculating additional charge for lineset greater than 15 feet.

1. Total Line Length (ft) = ____________________ (a)
2. Standard Lineset (ft) = ____________________ (b)
3. (a) minus (b) = ____________________ (c)
4. Refrigerant Multiplier = ____________________ (d)
5. Refrigerant Adder (c*d) = ____________________ (e)

*If the lineset is less than 15 feet, (e) = 0.

Sealed-System Repairs:
Calculating total system charge

1. Total Line Length (ft) = ____________________ (a)
2. Standard Lineset (ft) = ____________________ (b)
3. (a) minus (b) = ____________________ (c)
4. Refrigerant Multiplier = ____________________ (d)
5. Refrigerant Adder (c*d) = ____________________ (e)*
6. Factory Charge (nameplate)= ____________________ (f)
7. Total System Charge (e+f) = ____________________

*If the lineset is less than 15 feet, (e) = 0.

NOTE
The only mode approved for validating system charge is while in Cooling Mode. The outdoor temperature must be between 55°F and 115°F with Indoor Temperature kept between 70°F and 80°F.

Suction Line Pressure Charging & Refrigerant Adjustment in Cooling

1. Check the outdoor ambient temperatures.
   Suction line pressure (in cooling mode) is the only recommended method of charging above 55°F outdoor ambient temperatures.
   For outdoor ambient temperatures below 55°F, use the weigh-in charge method.
2. Ensure all previous sections have been completed.
3. Stabilize the system by operating for a minimum of 20 minutes.

NOTE
It is important to return in the spring or summer to accurately charge the system in cooling mode when outdoor ambient temperature is above 55°F.

• For best results, the indoor temperature should be kept between 70°F and 80°F.

NOTE
At startup, or whenever a charge is removed or added, the system must be operated for a minimum of 20 minutes to stabilize before accurate measurements can be made.

• Measured Suction Line Pressure = ________ PSIG
• Outdoor Ambient Temperature = __________ °F
• Indoor Ambient Temperature = __________ °F
• Calculate Liquid Line Pressure = __________ PSIG
• Measured Suction Line Temperature = _______ °F

Design Superheat with TXV Throttle

Outdoor DB (°F)	Indoor Unit Inlet DB/WB (°F)
	95/79	90/75	85/71	80/67	75/63	70/58
115	13	12	11	11	10	9
110	13	11	10	10	10	9
105	12	11	10	10	9	8
100	11	10	10	10	9	8
95	11	10	10	9	8	8
90	11	10	10	9	8	8
85	12	10	9	9	8	8
80	13	11	9	9	8	8
75	14	12	9	8	7	5
70	10	9	8	6	5	5
65	7	6	6	6	5	5
60	6	5	5	5	5	5
55	6	5	5	5	5	5

Design Superheat with Piston Throttle

Outdoor DB (°F)	Indoor Unit Inlet DB/WB (°F)
	95/79	90/75	85/71	80/67	75/63	70/58
115	16	11	6	5	5	5
110	18	13	8	5	5	5
105	20	15	10	5	5	5
100	23	17	13	7	5	5
95	25	20	15	9	5	5
90	27	22	17	12	5	5
85	29	24	19	14	8	5
80	25	20	16	11	7	5
75	22	18	14	95	5	5
70	22	18	13	8	5	5
65	21	17	13	8	5	5
60	20	16	12	7	5	5
55	19	15	11	5	5	5

Use the final superheat value, refrigerant temperature, and pressure from step 4, to determine the proper suction gauge pressure using the R410A Refrigerant Superheat Chart below.
Example: Assume a 12°F final superheat value and suction temperature of 58°F.

1. Locate 12°F final superheat in the table below.
2. Locate the Suction Temperature (58°F) in the left column.
3. The Suction Gauge Pressure should be approximately 133 PSIG. (This is shown as the intersection of the

Final Superheat column and the Suction Temperature row.)

• Design Superheat Value = __________°F
• Superheat Correction = __________°F
• Final Superheat Value = __________°F

R410A Refrigerant Superheat Chart
Suction Temp (°F)	Final Superheat (°F)
	6	8	10	12	14	16	18
	Suction Gauge Pressure (PSI)
40	105	101	97	93	89	86	82
42	109	105	101	97	93	89	86
44	114	109	105	101	97	93	89
46	118	114	109	105	101	97	93
48	123	118	114	109	105	101	97
50	128	123	118	114	109	105	101
52	133	128	123	118	114	109	105
54	138	133	128	123	118	114	109
56	143	138	133	128	123	118	114
58	148	143	138	133	128	123	118
60	153	148	143	138	133	128	123
62	159	153	148	143	138	133	128
64	164	159	153	148	143	138	133
66	170	164	159	153	148	143	138
68	176	170	164	159	153	148	143
70	182	176	170	164	159	153	148
72	188	182	176	170	164	159	153

SYSTEM OPERATION & TROUBLESHOOTING

Adjust refrigerant level to attain proper final superheat.

NOTE
Add refrigerant if the measured superheat is higher than the final superheat value.

• Connect gauges to refrigerant bottle and unit as illustrated.
• Purge all hoses.
• Open bottle.
• Stop adding refrigerant when gas line pressure matches the Refrigerant Charging Chart.

NOTE
Recover refrigerant if the measured superheat is lower than the final superheat value.

Stabilize the system.

• Wait 20 minutes for the system condition to stabilize between adjustments.

NOTE
When the gas line pressure matches the chart, the system is properly charged.

• Remove gauges.
• Replace service port caps to prevent leaks. Tighten finger tight plus an additional 1/6 turn.
• Record system information, pressures, and temperatures in the following reference table after charging is complete.

Reference Chart
Description	Value
Outdoor Model Number
Measured Outdoor Ambient Temperature	°F
Measured Indoor Ambient Temperature	°F
Liquid Gauge Pressure	PSIG
Suction Gauge Pressure	PSIG
Suction Line Temperature	°F

Protection Function

• Discharge Temperature Protection:
• Discharge Temperature > 239°F, the compressor stops working.
• Discharge Temperature < 167°F, compressor restarts working.

For 18K-30K High-Pressure Protection:
High Pressure > 609 PSIG, compressor & outdoor fan motor stop working.
High Pressure < 464 PSIG, compressor & outdoor fan motor restart working (3 minute delay necessary).

• T4 = Ambient Temperature
• T4 < 32°F, compressor can’t start
• T4 ≥ 41°F, compressor restarts working

For 42K-60K High Pressure Protection

• High Pressure > 638 PSIG, compressor and outdoor fan motor stop working.
• High Pressure < 464 PSIG, compressor and outdoor fan motor restart working (3-minute delay necessary).

Temperature Sensor Resistance Table

Temperature °F	Resistance Ω	Temperature °F	Resistance Ω	Temperature °F	Resistance Ω	Temperature °F	Resistance Ω
-4	106.73	37	29.87	78	10	119	3.69
-3	103.25	38	29.22	79	9.5	120	3.61
-2	99.89	39	28.19	80	9.26	121	3.53
-1	96.65	40	27.39	81	9.03	122	3.45
0	93.53	41	26.61	82	8.81	123	3.38
1	90.53	42	25.85	83	8.59	124	3.3
2	87.62	43	25.12	84	8.38	125	3.23
3	84.83	44	24.42	85	8.17	126	3.16
4	82.13	45	23.73	86	7.97	127	3.1
5	79.52	46	23.07	87	7.78	128	3.03
6	77.01	47	22.42	88	7.59	129	2.96
7	74.58	48	21.8	89	7.4	130	2.9
8	72.24	49	21.2	90	7.22	131	2.84
9	69.98	50	20.61	91	7.05	132	2.78
10	67.8	51	20.04	92	6.88	133	2.72
11	65.69	52	19.49	93	6.72	134	2.67
12	63.65	53	18.95	94	6.56	135	2.61
13	61.68	54	18.44	95	6.4	136	2.56
14	59.78	55	17.94	96	6.25	137	2.5
15	57.95	56	17.45	97	6.1	138	2.45
16	56.17	57	16.98	98	5.96	139	2.4
17	54.46	58	16.52	99	5.82	140	2.35
18	52.8	59	16.08	100	5.68	141	2.3
19	51.2	60	15.65	101	5.55	142	2.25
20	49.65	61	15.23	10	5.42	143	2.21
21	48.16	62	14.83	103	5.3	144	2.16
22	46.71	63	14.43	104	5.18	145	2.12
23	45.31	64	14.05	105	5.06	146	2.08
24	43.95	65	13.68	106	4.94	147	2.03
25	42.64	66	13.32	107	4.83	148	1.99
26	41.38	67	12.97	108	4.72	149	1.95
27	40.15	68	12.64	109	4.61	150	1.91
28	38.97	69	12.31	110	4.54	151	1.88
29	37.82	70	11.99	111	4.41	152	1.84
30	36.71	71	11.68	112	4.31	153	1.8
31	35.64	72	11.38	113	4.21	154	1.77
32	34.6	73	11.09	114	4.12	155	1.73
33	33.59	74	10.8	115	4.03	156	1.7
34	32.61	75	10.53	116	3.94	157	1.66
35	31.67	76	10	117	3.85	158	1.63
36	30.76	77	10	118	3.77	159	1.6

Electrical Data Table

Model	18	24	30	36	42	48	60
Minimum Circuit Ampacity (A)	11.9	16.3	16.3	21.1	24.8	29.7	38.5
Maximum Circuit Protector (A)	20	25	30	35	40	50	60

Troubleshooting Table

POST-INSTALLATION

Fault Code Table

• Fault Code of Motor Driver Module

• Fault Code of Main Control Module

Maintenance

• Dirt should not be allowed to accumulate on the indoor or outdoor coils or other parts in the air circuit.
• Clean as often as necessary to keep the unit clean. Use a brush, vacuum cleaner attachment, or other suitable means.
• The outdoor fan motor is permanently lubricated and does nto require periodic oiling.
• Refer to the furnace or air handler instructions for filter and blower motor maintenance.
• The indoor coil and drain pan should be inspected and cleaned regularly to ensure proper drainage.

NOTE
It is unlawful to knowingly vent, release, or discharge refrigerant into the open air during repair, service, maintenance, or the final disposal of this unit. When the system is functioning properly and the owner has been fully instructed, secure the owner’s approval.

Removing & Installing the Cover Plate

1. Before removing the cover plate of the electronic control box, ensure screws 1-7 are removed first.
2. When reinstalling the cover plate, screws 1 and
3. must be installed at the last step to facilitate assembly and avoid damage to the waterproof sponge.

Changing the Motor

When the motor requires changing, follow the steps below:

• STEP 1 – Go into the electrical panel, and disconnect the motor power lines.
• Note: Disconnect the main power to the unit. Severe burns and electrical shock will occur if the main power is not disconnected.
• STEP 2 – Remove the cover (be careful of motor wires).
• STEP 3 – Be sure to place the fan cover unit on the ground.
• Note: Do not place or lean fan blades on the ground or against the surface.
• STEP 4 – Remove fan motor by removing 5/16″ nuts from the cover.
• STEP 5 – Remove fan blade from the motor by removing 1/2″ nut and place fan on the ground.
• STEP 6 – Reverse removal process to reinstall the fan and motor.
• Note: When connecting motor wires, be sure to check motor direction.

NOTE
Damage will occur to the condensing unit if the 5/16″ nuts are removed prior to the removal of the cover.

Operational & Checkout Procedures
Final phases of this installation are the unit Operational and Checkout Procedures. To obtain proper performance, all units must be operated and charge adjustments made.
After installation has been completed, it is recommended that the entire system be checked against the following list:

• Be sure unit suspension (if used) is secure and that there are no tools or loose debris in, around, or on top of the unit.
• Properly insulate suction lines and fittings.
• Properly secure and isolate all refrigerant lines.
• Verify that all electrical connections are tight.
• Check all duct outlets; they must be open and unrestricted.
• Check drain lines and be sure all joints are tight.
• Be sure that a return air filter is installed.
• Operate a complete system in each mode to verify proper performance. Verify proper performance of supplementary electric heater if applicable.

FAQ

• Q: What should I do if I encounter an error code on the display?
  • A: Error codes indicate specific issues with the air conditioner. Refer to the troubleshooting section of the manual to identify the error code and follow the recommended actions to resolve it.
• Q: Can I install the air conditioner myself?
  • A: It is recommended to have a professional HVAC technician install the air conditioner to ensure proper setup and avoid any potential safety hazards or damage to the unit.

PRODIRECT™ Series Split System Air Conditioner

• The design and specifications of this product and/or manual are subject to change without prior notice.
• Consult with the sales agency or manufacturer for details.
• Read this manual carefully before installation and keep it where the operator can easily find it for future reference.
• Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice.
• Version Date: November 21, 2024
• Please visit www.mrcool.com/documentation to ensure you have the latest version of this manual

Documents / Resources

MRCOOL HAC13018FA Series Split System Air Conditioner [pdf] Owner's Manual HAC13018FA Series Split System Air Conditioner, HAC13018FA Series, Split System Air Conditioner, Air Conditioner, Conditioner

References

• User Manual