MITSUBISHI ELECTRIC PUZ-HA24NHA1 Professional Heat Pump Outdoor Unit Instruction Manual

• Be sure to install the unit in a sturdy, level surface to prevent rattling noises during operation. (Fig. 3-1)

< Foundation specifications>

• Make sure that the length of the foundation bolt is within 30 mm, 1-3/16 inch of the bottom surface of the base.

• Secure the base of the unit firmly with four-M10 foundation bolts in sturdy locations.
  Installing the outdoor unit

• Do not block the vent. If the vent is blocked, operation will be hindered and breakdown may result.

• In addition to the unit base, use the installation holes on the back of the unit to attach wires, etc., if necessary to install the unit. Use self-tapping screws (ø5 × 15 mm, ø13/16 × 19/32 inch or less) and install on site.

Warning :

• The unit must be securely installed on a structure that can sustain its weight. If the unit is mounted on an unstable structure, it may fall down and cause damage or injuries.
• The unit must be installed according to the instructions in order to minimize the risk of damage from earthquakes, typhoons, or strong winds. An incorrectly installed unit may fall down and cause damage or injuries.

Installing the refrigerant piping

A Liquid pipe
B Gas pipe
C Insulation
D Taping

A Flare cutting dimensions
B Flare nut tightening torque

A (Fig. 4-1)

B (Fig. 4-1)

A Front piping cover
B Piping cover
C Stop valve
D Service panel
E Bend radius : 100 mm, 3-15/16 inch-150 mm, 5-27/32 inch

Precautions for devices that use R410A refrigerant

• Refer to 1.5. for precautions not included below on using air conditioners with R410A refrigerant.
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil applied to the flared sections.
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses specified in the table to the below. Make sure the insides of the pipes are clean and do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust.

Warning:

When installing or relocating, or servicing the air conditioner, use only the specified refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specified for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case, this could lead to a serious impediment to securing product safety.

Do not use pipes thinner than those specified above.

Connecting pipes (Fig. 4-1, Fig. 4-2)

When commercially available copper pipes are used, insulate both the liquid and gas pipes separately with commercially available insulation materials (heat-resistant to 100°C, 212°F or more, thickness of 12 mm, 1/2 inch or more). (Fig. 4-1)

• The indoor parts of the drain pipe should be wrapped with polyethylene foam insulation materials (specific gravity of 0.03, thickness of 9 mm, 23/64 inch or more). [Fig. 4-2]
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening flare nut. A
• Use two wrenches to tighten piping connections. B
• Use leak detector or soapy water to check for gas leaks after connections are completed.
• Apply refrigerating machine oil over the entire flare seat surface. C
• Use the flare nuts for the following pipe size. D

*: The flare nut is supplied as an outdoor unit accessory. Be sure to use it otherwise gas leakage or even pipe extraction may occur.

• When bending the pipes, be careful not to break them. Bend radii of 100 mm, 3-15/16 inch to 150 mm, 5-27/32 inch are sufficient.
• Make sure the pipes do not contact the compressor. Abnormal noise or vibration may result.

1. Pipes must be connected starting from the indoor unit. Flare nuts must be tightened with a torque wrench.
2. Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration oil (Applied on site).

Warning:

When installing the unit, securely connect the refrigerant pipes before starting the compressor.

Refrigerant piping (Fig. 4-3)

Remove the service panel D (3 screws) and the front piping cover A (2 screws) and rear piping cover B (2 screws: HA24) (4 screws: HA30, HA36, HA42).

1. Perform refrigerant piping connections for the indoor/outdoor unit when the outdoor unit’s stop valve is completely closed.

2. Vacuum-purge air from the indoor unit and the connection piping.

3. After connecting the refrigerant pipes, check the connected pipes and the indoor unit for gas leaks. (Refer to 4.4 Refrigerant pipe airtight testing method)

4. Vacuumize the refrigerant lines through the service port of the liquid stop valve and then open the stop valves completely (for both the liquid and gas stop valves). This will completely connect the refrigerant lines of the indoor and outdoor units.

   • If the stop valves are left closed and the unit is operated, the compressor and control valves will be damaged.
   • Use a leak detector or soapy water to check for gas leaks at the pipe connection sections of the outdoor unit.
   • Do not use the refrigerant from the unit to purge air from the refrigerant lines.
   • After the valve work is completed, tighten the valve caps to the correct torque: 20 to 25 N·m, 14 to 18 ft·lbs (200 to 250 kgf·cm).
     Failure to replace and tighten the caps may result in refrigerant leakage. In addition, do not damage the insides of the valve caps as they act as a seal to prevent refrigerant leakage.

5. Use sealant to seal the ends of the thermal insulation around the pipe connection sections to prevent water from entering the thermal insulation.

A Stop valve
B Stop valve
C Service port
D Open/Close section
E Local pipe
F Sealed, same way for gas side
G Pipe cover
H Do not use a wrench here.
Refrigerant leakage may result.
I Use two wrenches here

The figure to the left is an example only.
The stop valve shape, service port position, etc., may vary according to the model.

• Turn section A only. (Do not further tighten sections A and

B together.)
C Charge hose
D Service port

Refrigerant pipe airtight testing method (Fig. 4-4)

(1) Connect the testing tools.

• Make sure the stop valves A B are closed and do not open them.
• Add pressure to the refrigerant lines through the service port C of the liquid stop valve D.

(2) Do not add pressure to the specified pressure all at once; add pressure little by little.

1. Pressurize to 0.5 MPa (5 kgf/cm2G), wait five minutes, and make sure the pressure does not decrease.
2. Pressurize to 1.5 MPa (15 kgf/cm2G), wait five minutes, and make sure the pressure does not decrease.
3. Pressurize to 4.15 MPa (41.5 kgf/cm2G) and measure the surrounding temperature and refrigerant pressure.
   (3) If the specified pressure holds for about one day and does not decrease, the pipes have passed the test and there are no leaks.
   • If the surrounding temperature changes by 1 °C, the pressure will change by about 0.01 MPa (0.1 kgf/cm2G). Make the necessary corrections.
   (4) If the pressure decreases in steps (2) or (3), there is a gas leak. Look for the source of the gas leak.

Stop valve opening method

(1) Gas side (Fig. 4-5)

1. Remove the cap and turn the valve rod counterclockwise as far as it will go with the use of a 4 mm hexagonal wrench. Stop turning when it hits the stopper. (ø15.88, 5/8 inch: Approximately 11 revolutions)
2. Make sure that the stop valve is open completely and rotate the cap back to its original position.
   

(2) Liquid side (Fig. 4-6)

1. Remove the cap and turn the valve rod counterclockwise as far as it will go with the use of a 4 mm hexagonal wrench. Stop turning when it hits the stopper. (ø6.35, 1/4 inch: Approximately 4.5 revolutions) (ø9.52, 3/8 inch: Approximately 10 revolutions)
2. Make sure that the stop valve is open completely and rotate the cap back to its original position.

A Valve body
B Unit side
C Cap
D Local pipe side
E Pipe cover
F Service port
G Valve stem
H Double spanner section (Do not apply a spanner other than to this section.Doing so would cause refrigerant leaks.)
I Seal section
(Seal the end of the heat insulation material at the pipe connection section with whatever seal material you have on hand so that water does not infiltrate the heat insulation material

Refrigerant pipes are protectively wrapped

• The pipes can be protectively wrapped up to a diameter of ø90 mm, 3-35/64 inch before or after connecting the pipes. Cut out the knockout in the pipe cover following the groove and wrap the pipes.
  Pipe inlet gap

• Use putty or sealant to seal the pipe inlet around the pipes so that no gaps remain.(If the gaps are not closed, noise may be emitted or water and dust will enter the unit and breakdown may result.)

Precautions when using the charge valve (Fig.4-7)
Do not tighten the service port too much when installing it, otherwise, the valve core could be deformed and become loose, causing a gas leak.
After positioning section B in the desired direction, turn section A only and tighten it.
Do not further tighten sections A and B together after tightening section A.

Warning:
When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap between the valve stem and the valve body, resulting in injuries.

Addition of refrigerant

• Additional charging is not necessary if the pipe length does not exceed 30 m, 100 ft
• If the pipe length exceeds the specified length above, charge the unit with additional R410A refrigerant according to the permitted pipe lengths in the chart below.
• When the unit is stopped, charge the unit with the additional refrigerant through the liquid stop valve after the pipe extensions and indoor unit have been vacuumized.  When the unit is operating, add refrigerant to the gas check valve using a safety charger. Do not add liquid refrigerant directly to the check valve.
• After charging the unit with refrigerant, note the added refrigerant amount on the service label (attached to the unit). Refer to the “1.5. Using R410A refrigerant air conditioners” for more information.
• Be careful when installing multiple units. Connecting to an incorrect indoor unit can lead to abnormally high pressure and have a serious effect on operation performance.

Model| Max pipe length| Max height difference| Additional refrigerant charging amount
---|---|---|---
20 m| 24 m| 27 m| 30 m| 34 m| 37 m| 40 m| 43 m| 46 m| 49 m| 50 m| 52 m| 55 m| 58 m| 61 m| 64 m| 67 m| 70 m| 73 m| 75 m
70 ft| 80 ft| 90 ft| 100 ft| 110 ft| 120 ft| 130 ft| 140 ft| 150 ft| 160 ft| 165 ft| 170 ft| 180 ft| 190 ft| 200 ft| 210 ft| 220 ft| 230 ft| 240 ft| 245 ft
HA24| 50 m, 165 ft| 30 m, 100 ft| 0| 0.2 kg 7 oz| 0.4 kg 14 oz| 0.6 kg 21 oz| 0.8 kg 28 oz| 1.0 kg 35 oz| 1.2 kg 42 oz| 1.4 kg 49 oz| 1.6 kg 56 oz| 1.8 kg 63 oz| 1.9 kg 67 oz| –| –| –| –| –| –| –| –| –
HA30, 36| 75 m, 245 ft| 30 m, 100 ft| 0| 0| 0| 0| 0.2 kg 7 oz| 0.4 kg 14 oz| 0.5 kg 18 oz| 0.7 kg 25 oz| 0.9 kg 32 oz| 1.0 kg 35 oz| 1.1 kg 39 oz| 1.2 kg 42 oz| 1.4 kg 49 oz| 1.4 kg 49 oz| 1.4 kg 49 oz| 1.4 kg 49 oz| 1.4 kg 49 oz| 1.4 kg 49 oz| 1.4 kg 49 oz| 1.4 kg 49 oz
HA42| 75 m, 245 ft| 30 m, 100 ft| 0| 0| 0| 0| 0.2 kg 7 oz| 0.4 kg 14 oz| 0.5 kg 18 oz| 0.7 kg 25 oz| 0.9 kg 32 oz| 1.0 kg 35 oz| 1.1 kg 39 oz| 1.2 kg 42 oz| 1.4 kg 49 oz| 1.5 kg 53 oz| 1.7 kg 60 oz| 1.9 kg 67 oz| 2.0 kg 71 oz| 2.2 kg 78 oz| 2.3 kg 81 oz| 2.4 kg 85 oz

For twin combination

Refrigerant piping limitation of length, height difference are shown in the figure. (Fig. 4-8)
A Indoor unit
B Outdoor unit
C Multi distribution pipe (option)
D Height difference (Indoor unit-Outdoor unit) Max. 30 m, 100 ft
E Height difference (Indoor unit-Indoor unit) Max. 1 m, 3 ft
A: Main piping
B,C: Branch piping Max. 20 m, 65 ft

Drainage piping work

Outdoor unit drainage pipe connection When drain piping is necessary, use the drain socket or the drain pan (opti

• Do not use the drain pipe in cold climates as it may freeze.

Electrical work

Outdoor unit (Fig. 6-1, Fig. 6-2)

1. Remove the service panel.
2. Wire the cables referring to the Fig. 6-1 and the Fig 6-2

A Indoor unit
B Outdoor unit
C Remote controller
D Main switch (Breaker)
E Earth

A Earth terminal
B Terminal block
C Clamp
D Service panel
E Wire the cables so that they do not contact the center of the service panel or the gas valve.

Electrical work

Field electrical wiring

AWG 8
Indoor unit-Outdoor unit *1|

3 × AWG 14 (polar)

Indoor unit earth *1|

1 × Min. AWG 14

Remote controller-Indoor unit *2|

2 × AWG 22 (Non-polar)

Circuit rating| Outdoor unit L1-L2 *3|

208/230 VAC

Indoor unit-Outdoor unit S1-S2 *3|

208/230 VAC

Indoor unit-Outdoor unit S2-S3 *3|

24 VDC

Remote controller-Indoor unit      *3|

12 VDC

1. Max. 45 m, 147 ft
If 2.5 mm2 used, Max. 50 m, 164 ft
If 2.5 mm2 used and S3 separated, Max. 80 m, 262ft
*2.* The 10 m, 30 ft wire is attached in the remote controller accessory. Max 1500 ft
3.** The figures are NOT always against the ground.
S3 terminal has 24 VDC against S2 terminal. However between S3 and S1, these terminals are NOT electrically insulated by the transformer or other device.
*4. Please follow applicable federal, state, or local codes to prevent potential leakage/electric shock. Or install a ground fault interrupt for the prevention of leakage and electric shock.
Notes:

1. Wiring size must comply with the applicable local and national code.
2. Use copper supply wires.
3. Use wires rated 600V or more for the power supply cables and the indoor/outdoor unit connecting cables.
4. Install an earth longer than other cables.

Warning:
In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3 terminals when the power is energized. If isolator should be used between indoor unit and outdoor unit, please use 3-pole type.
Warning:

• Turn on the main power when the ambient temperature is -20°C, -4°F or higher.
• In below -20°C, -4°F condition, it needs at least 4hr standby to operate in order to warm the electrical parts

Never splice the power cable or the indoor-outdoor connection cable, otherwise it may result in a smoke, a fire or communication failure.

Test run

Before test run

After completing installation and the wiring and piping of the indoor and outdoor units, check for refrigerant leakage, looseness in the power supply or control wiring, wrong polarity, and no disconnection of one phase in the supply.
Use a 500-volt megohmmeter to check that the resistance between the power supply terminals and ground is at least 1 MΩ.
Do not carry out this test on the control wiring (low voltage circuit) terminals.
Warning:
Do not use the air conditioner if the insulation resistance is less than 1 MΩ.
Insulation resistance
After installation or after the power source to the unit has been cut for an extended period, the insulation resistance will drop below 1 MΩ due to refrigerant accumulating in the compressor. This is not a malfunction. Perform the following procedures.

1. Remove the wires from the compressor and measure the insulation resistance of the compressor.
2. If the insulation resistance is below 1 MΩ, the compressor is faulty or the resistance dropped due the accumulation of refrigerant in the compressor.
3. After connecting the wires to the compressor, the compressor will start to warm up after power is supplied. After supplying power for the times indicated below, measure the insulation resistance again.
   • The insulation resistance drops due to accumulation of refrigerant in the compressor. The resistance will rise above 1 MΩ after the compressor is warmed up for two to three hours. (The time necessary to warm up the compressor varies according to atmospheric conditions and refrigerant accumulation.)
   • To operate the compressor with refrigerant accumulated in the compressor, the compressor must be warmed up at least 12 hours to prevent breakdown.
4. If the insulation resistance rises above 1 MΩ, the compressor is not faulty

Caution:

• The compressor will not operate unless the power supply phase connection is correct.
• Turn on the power at least 12 hours before starting operation.
  • Starting operation immediately after turning on the main power switch can result in severe damage to internal parts. Keep the power switch turned on during the operational season.

► The followings must be checked as well.

• The outdoor unit is not faulty. LED1 and LED2 on the control board of the outdoor unit flash when the outdoor unit is faulty.
• Both the gas and liquid stop valves are completely open.
• A protective sheet covers the surface of the DIP switch panel on the control board of the outdoor unit. Remove the protective sheet to operate the DIP switches easily.
• Make sure that the all of the SW5 DIP switches for function changes on the control board of the outdoor unit are set to OFF. If all of the SW switches are not set to OFF, record the settings and then set all of the switches to OFF. Begin recovering the refrigerant. After moving the unit to a new location and completing the test run, set the SW5 switches to the previously recorded settingS.

Test run

Using SW4 in outdoor un

• After performing the test run, set SW4-1 to OFF.

  • After power is supplied, a small clicking noise may be heard from the inside of the outdoor unit. The electronic expansion valve is opening and closing. The unit is not faulty.
  • A few seconds after the compressor starts, a clanging noise may be heard from the inside of the outdoor unit. The noise is coming from the check valve due to the small difference in pressure in the pipes. The unit is not faulty.
    The test run operation mode cannot be changed by DIP switch SW4-2 during the test run. (To change the test run operation mode during the test run, stop the test run by DIP switch SW4-1. After changing the test run operation mode, resume the test run by switch SW4-1.)

Using remote controller

Refer to the indoor unit installation manual.
Note: Occasionally,vapor that is made by the defrost operation may seem as if smoke come up from the outdoor unit.

A Circuit diagram example (low noise mode)
B On-site arrangement
C External input adapter (PAC-SC36NA-E)
X: Relay
D Outdoor unit control board
E Max. 10 m, 33 ft
F Power supply for relay

Low noise mode (on-site modification) (Fig. 8-1)

By performing the following modification, operation noise of the outdoor unit can be reduced by about 3-4 dB.
The low noise mode will be activated when a commercially available timer or the contact input of an ON/OFF switch is added to the CNDM connector (option) on the control board of the outdoor unit.

• The ability varies according to the outdoor temperature and conditions, etc.

1. Complete the circuit as shown when using the external input adapter (PAC-SC36NA-E). (Option)
2. SW7-1 (Outdoor unit control board): OFF (Operation of HA24)
3. SW1 ON: Low noise mode
   SW1 OFF: Normal operation

Special Functions

A Circuit diagram example (Demand function)
B On-site arrangement X, Y: Relay
C External input adapter (PAC-SC36NA-E)
D Outdoor unit control board
E Max. 10 m, 33 ft
F Power supply for relay

Demand function (on-site modification) (Fig. 8-2)

By performing the following modification, energy consumption can be reduced to 0–100% of the normal consumption.
The demand function will be activated when a commercially available timer or the contact input of an ON/OFF switch is added to the CNDM connector (option) on the control board of the outdoor unit.

1. Complete the circuit as shown when using the external input adapter (PAC-SC36NA-E). (Option)
2. By setting SW7-1 on the control board of the outdoor unit, the energy consumption (compared to the normal consumption) can be limited as shown below.

| SW7-1| SW2| SW3| Energy consumption
---|---|---|---|---
Demand function| ON| OFF| OFF| 100%
ON| OFF| 75%
ON| ON| 50%
OFF| ON| 0% (Stop)

Refrigerant collecting (pump down)

Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit.
1 Supply power (circuit breaker).

• When power is supplied, make sure that “CENTRALLY CONTROLLED” is not displayed on the remote controller. If “CENTRALLY CONTROLLED” is displayed, the refrigerant collecting (pump down) cannot be completed normally.
• Start-up of the indoor-outdoor communication takes about 3 minutes after the power (circuit breaker) is turned on. Start the pump-down operation 3 to 4 minutes after the power (circuit breaker) is turned ON.
  2 After the liquid stop valve is closed, set the SWP switch on the control board of the outdoor unit to ON. The compressor (outdoor unit) and ventilators (indoor and outdoor units) start operating and refrigerant collecting operation begins. LED1 and LED2 on the control board of the outdoor unit are lit.
• Only set the SWP switch (push-button type) to ON if the unit is stopped.
  However, even if the unit is stopped and the SWP switch is set to ON less than 3 minutes after the compressor stops, the refrigerant collecting operation cannot be performed. Wait until compressor has been stopped for 3 minutes and then set the SWP switch to ON 3 Because the unit automatically stops in about 2 to 3 minutes when the refrigerant collecting operation is completed (LED1 off, LED2 lit), be sure to quickly close the gas stop valve. If LED1 is lit and LED2 is off and the outdoor unit is stopped, refrigerant collection is not properly performed. Open the liquid stop valve completely, and then repeat step 2 after 3 minutes have passed.
• If the refrigerant collecting operation has been completed normally (LED1 off, LED2 lit), the unit will remain stopped until the power supply is turned off.
  4 Turn off the power supply (circuit breaker).
• Note that when the extension piping is very long with large refrigerant amount, it may not be possible to perform a pump-down operation. When performing the pump-down operation, make sure that the low pressure is lowered to near 0 MPa (gaug).

Warning:
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst if air etc. get into it.

System control (Fig. 9-1)

A Outdoor unit
B Indoor unit
C Master remote controller
D Subordinate remote controller
E Standard 1:1 (Refrigerant address = 00)
F Simultaneous twin (Refrigerant address = 01)
G Simultaneous twin (Refrigerant address = 02)

• Set the refrigerant address using the DIP switch of the outdoor unit.

  1. Wiring from the Remote Control
     This wire is connected to TB5 (terminal board for remote controller) of the indoor unit (non-polar).

  2. When a Different Refrigerant System Grouping is Used.
     Up to 16 refrigerant systems can be controlled as one group using the slim MA remote controller.

Note:
In single refrigerant system (twin), there is no need of wiring 2

| Function| Operation according to switch setting
---|---|---
ON| OFF
SW1function settings| 1 Compulsory defrosting| Start| Normal
2 Error history clear| Clear| Normal
3 Refrigerant 4 system ad- 5 dress setting 6| Settings for outdoor unit addresses 0 to 15

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