HITACHI RAM-125FPS Multi Split System Heat Pump Air Conditioners Instruction Manual

Selection of connector
The thickness of connectors (elbows and tubing) must be changed according to the design pressure change. As 1/2H parts cannot be bend or expanded, select the appropriate tubing according to the minimum thickness below. Please note that the sizes of flare nuts also change.

Connection minimum thickness(mm)

Flare Nut size B{mm)

Pipe Size

| Flare Nut Size B(mm)|

Pipe Size

| Flare Nut Size B(mm)
---|---|---|---
R407C • R22| R410A| R407C • R22| R410A

Factory-Supplied Accessories
The following is accessory parts of the outdoor unit. Please confirm it before installation.

Combination of Indoor Unit and Outdoor Unit

1. Select the quantity and capacity of indoor unit for outdoor unit as shown below. (Please pay attention! When the indoor unit does not fit the “Minimum Individual Operation Capacity”, the outdoor unit will not run.)
   Accessory| Q’ty| Use Place| Use Method
   ---|---|---|---
   Special Washer                                       @

n

|

4

|

Unit base to fix

| Please refer to installation instructions on page 6.

Drain Connector

|

1

|

Base condensation water exhaust

|

Washer

|

1

Stop Gap Material

|

4

| For 4-<1>24 drain holes to stop gap (Please refer to installation instructions on page 6.)
2. Cooling operating instructions.
The same refrigerant system of indoor unit, the cooling shall be operated.

3. NOTE:
   This unit will not operate in the first 4 hours after power connection. The error code will be “d 1-22”. Follow the steps below to deactivate protection if you need to operate the unit within four hours after power connection.

4. Connect the power of both the indoor and outdoor units.

5. Wait for 30 seconds.

6. Press the PSW1 and PSW3 switches simultaneously on the main board of outdoor unit for three seconds.

Outdoor Unit Installation

NOTICE

1. Do not install the outdoor unit where there is a high level of oil mist, salty air or harmful gases such as sulphur. (Fault may occur more easily when installing in such locations/environments. Apply special protection if it is necessary to install the air-conditioner in these locations/environments.)
2. Do not install the outdoor unit where the electromagnetic wave is directly radiated to the electrical box.
3. Install the outdoor unit as far as at least 3 meters from the electromagnetic wave radiator.
4. Do not install the outdoor unit in the indoor.

Installation Space
Retain maintenance space for the outdoor unit as shown below

Installation place

1. Install the outdoor unit where good ventilation is available, and where it is dry.
2. Install the outdoor unit where it is in the shade or it will not be exposed to direct sunshine or direct radiation from high temperature heat.
3. The sound from the outdoor unit must not disturb your neighbors. (The operating sound at the rear sides is 3 to 5 db (A) higher than the value in the catalog at the front side).
4. Unit air outlet must not directly flow to the plants or your neighbor’s windows.
5. Do not install the heal exchanger in places where dust or scrap paper can enter easily. Add a wind guard (see below) as necessary to deflect wind.
6. Avoid installing the unit in places with headwind (wind directly blowing against the fan). Add a wind guard when installing in places with strong wind.
7. During installation, please note the following:
8. To prevent the outdoor unit from falllng, shaklng, and producing noise In a strong wind or an earthquake, Install the unit using appropriate methods. Determine the required installation strength by calculating the seismic strength. Do not install the unit at locations where strong wind may blow off the roof or wall. Secure the unit with steal wire if necessary.
9. Add rubber cushions to the four legs of the unit stand, please use anti-vibration rubber.
10. The locatlon should be convenient for draining rainwater and condensate from defrosting. For good drainage, the outdoor unit should be installed in places with draining facilities. (When installing under roofs where condensate drips, this may wet the floor to cause fall in winter.) Also, using central draining pipes is easier. (In frigid zones, condensate from defrosting may freeze easily in winter, do not use central draining pipes.)
11. Provide a foundation so that the entire footing of the outdoor unit can be mounted on the foundation. The height of the foundation should be 100mm to 300mm higher than the ground level.

Strong wind blowlng dlrectly against the product lnstallatlon method
Follow the instructions below when installing the unit on the roof with strong winds in the absence of obstruction:

• Do not face the unit’s air ouUet gr111 toward the strong winds. This will interfere the air ventilation of the unit and will cause damage to the unit.
• When strong winds dlrectty blowlng against the air outlet grille.

Note : When strong winds continuously blow toward the air outlet of the outdoor unit, the ventilation fan will rotate in reverse and become damaged.

• Whan on the roof or open space, the strong winds will damage the unit. Please make steel wire cable and others to fixed the unit.

Installation Work
Securely fix the outdoor unit on the foundation to prevent noise and collapse by strong wind or an earthquake due to loss of level (leaning aside).

1. Secure the outdoor unit with the anchor bolts.

2. Installation size of anchor bolts

3. Example of fixing the stand with anchor bolts:
   Make sure to cut off section A when using this type of anchor bolts. Otherwise, it will be difficult to remove thepipe cover.

4. Confirm lnstallatlon of drainage and drain elbow:

   • When defrost operation, the condensate water will be discharged, select the best location for the water discharge to the drainage ditch. Also, avoid installing the unit ovemead as water will drip from the unit. Plan drainage for the secondary oondensate tray If overhead lnstallatlon Is necessary.
   • If the overhead lnstallatton Is required, please use condensatton water drain pipes kit (option) Concentration Drain Pipes Kit
     Type : DBS-26(L)

5. To avoid dumping the body resulting In noise, or due to gusts and earthquakes caused by inclination. Be sure to make the outdoor unit fixed securely.

6. When using ordinary frames whose legs are narrower than the legs of the outdoor unit, add a board under the legs of the outdoor unit as shown in the figure before installation to ensure all legs of the outdoor unit are adequately supported on the frame.

Refrigerant Piping Work

Refrigerant Piping Work

1. Please refer to the following table for Pipe Size, Length and Lift difference between the indoor and outdoor unit.
   .

Example of Systems  .

…

,. These figures show examples of 4 indoor units

combined with one outdoor unit.

The refrigerant pipes are shown as single line in the diagrams.

However, liquid line piping and gas line piping are

.., required in the field.

| | |
---|---|---|---
The Total Length of Piping| LO+ L1+ L2+ L3+ L4       95m
Maximum Piping Length(Actual Length)| From the outdoor unit to the indoor unit’s piping length.| L t 75m

Maximum Lift between

Outdoor Unit and Indoor Unit

| In the case that the position of outdoor unit is higher than that of indoor unit.| ****

H1 30m

In the case that the position of outdoor unit is lower than that of indoor unit.| ****

H1 20m

Maximum Lift between Each Indoor Unit, or Multi-kit and Indoor Unit| ****

H2 3m

Maximum Piping Length between Multi-kit and Indoor Unit| L1 ,L2,L3,L4 10m
Choice of each Multi-kit| “a~c” Use MW-NP282A

Note the common

| 1. Liquid, gas of the piping length and piping path to be the same.

2. Multi-kit pipe have to install around the indoor unit.

2. Piping Size
   • Indoor Unit

Horse-Power

| Piping Size(mm)
---|---
Gas| Liquid
0.8~1.5HP

22~45 Level

|

|

2.0~2.3HP

56 Level

|

2.5~3.0HP

63~90 Level

|

4.0~6.0HP

112~160 Level

  * Outdoor Unit  

Model

| Piping Size (mm)
---|---
Gas| Liquid

RAM-125, 140FPS(B)

|

|

3. Cautions for Refrigerant Piping Work (For Example)
   Select clean copper pipes. Maka sure that there Is no dust and moisture Inside the pipes. When cuffing off the refrigerant piping, use the Pipe Cutter. Blow the inside of the pipes with nitrogen or dry air to remove any dust or foreign materials before connecting pipes. (Avoid using e saw or grinding stone tools that is easy to produce powder.)

4. Prepare locally-supplied copper pipe

5. Connect the multi-kit to the indoor unit, be sure to use the option parts of the multi-kit , do not use connectors. In multi-kit lnstalla11on, please keep columns, walls, callings and other surfaces to maintain a hortzontal direction for fixing the multi-kit.

< Caution for maaaurlng pressure data from the check Joints.>
Read the pressure data from the check joints of the gas line stop valve (right figure®) and the check joints of piping line (right figure(ID) after you connect. And please read the details in changing high and low pressure position of the connection according to the different operation state, please refer to the following descrintion of the table.

Piping Direction

After removing the knock-out hole, please ‘bim burrs. To protect the wiring and piping, use the insulation material (Field-supplied materials) to wrap.

1. In using rubber plugs and wire tubes, make sure to check the size of the gap Lower Right Rear Cover referred to the knock-out hole.

2. When removing the front and right piping, please pay more attention when lnstalllng In order to ensure the wlrtng removing space.
   Example : When Nmoving the rear piping and the right wiring, remove the part of piping to make the gap of the upper part (A division). The unirs internal piping and wiring shall not interfere with each other.

3. For connection piping bending, use the pipe bender.

4. In order to metel plate’s burrs does not cut the wiring and piping, use the insulation material (field-supplied materials) to protect them.

5. In order to prevent rainwater intrusion in the unit, be sure to install the piping cover. When you install the cover, be sure to install the insulation material (field-supplied materials) to the piping through the hole to resist clearance. At the same time, remove the part under the side of the pipe cover to install it easily.

Piping Connection .. Insulation

1. Check if the stop valves of the outdoor unit is closed.
2. Please connect the piping between the indoor and outdoor unit. When tightening the joints of piping, please insert the inside and outside of flare piping, coated with a layer of refrigerant oil, and in accordance with the provisions of tightening torque with double spanner to tighten. After tightening, please check for gas leakage once more. During brazing, please blow nitrogen into the piping.
3. Connect the indoor unit and the outdoor unit with field-supplied refrigerant piping. Suspend the refrigerant piping at certain points and prevent the refrigerant piping from touching the weak part of the building such as wall, ceiling, etc.( If touched, abnormal sound may occur due to the vibration of the piping. Pay special attention in case of short piping length.)
4. Please confirm any gas leakage at the flare nut connections or brazed parts.
5. Completely insulate the unions and flare-nuts at the piping connections. Insulate the liquid piping and gas piping completaly to avoid decreasing of performance and dewing on the surface of the pipe.

Piping Connection .. lnaulation

1. Check if the stop valves of the outdoor unit is closed.
2. Please connect the piping between the indoor and outdoor unit. When tightening the joints of piping, please insert the inside and outside of flare piping, coated with a layer of refrigerant oil, and in accordance with the provisions of tightening torque with double spanner to tighten. After tightening, please check for gas leakage once more. During brazing, please blow nitrogen into the piping.
3. Connect the indoor unit and the outdoor unit with field-supplied refrigerant piping. Suspend the refrigerant piping at certain points and prevent the refrigerant piping from touching the weak part of the building such as wall, ceiling, etc.( If touched, abnormal sound may occur due to the vibration of the piping. Pay special attention in case of short piping length.)
4. Please confirm any gas leakage at the flare nut connections or brazed parts.
5. Completely insulate the unions and flare-nuts at the piping connections. Insulate the liquid piping and gas piping completaly to avoid decreasing of performance and dewing on the surface of the pipe.
6. Air-tight Teat
7. Before performing the air-tight test, please close the spindle valve of gas stop valve and liquid stop valve.
8. Connect the gauge manifold using charging hoses with a vacuum pump or a nitrogen cylinder to the check Joints of the llquld llne and the gas llne stop valves. Perform the air-tight tasl Connect a manifold gauge to the check joints of the liquid and gas stop valves in the outdoor unit Do not open the stop valves. Apply nitrogen gas pressure of 4.15 Mpa.

The Vacuum, Filling Refrigerant

1. Yacuum

2. For the details of stop valve operation, please refer to the attention of nameplate inside service cover description.

3. Connect a manifold gauge to 1he check joints at the both sides. Continue vacuum pumping wort until the pressure reaches -0.1MPa (-750mmHg) or lower for one to two hours.

4. After vacuum pumping work, stop the mani-fold valve, stop the vacuum pump and leave it for one hour. Check to ensure that the pressure In the manlfold gauge does not Increase.

5. The check joints and flare nut cannot connect, so please use the charging hose. After connecting, please tighten the flare nut with 15 – 16N • m of torque.

6. Check for any gas leakage at the flare nut connections, or brazed parts by gas leakage tester or foaming agent. The following table is recommended for foam tasting fluid, component is not clear if will use the general household cleaner liquid as a foam testing.

7. Fillng Refrigerant

8. The unit has been filled with refrigerant, if the connecting pipe is longer than the length of setting standard refrigerant volume, please add the appropriate amount of refrigerant (Please refer to page.12).

9. Fully open the gas line stop valve and slightly open the liquid line stop valve.

10. In cooling operation, connect the gauge manifold using charging hose with a refrigerant charging cylinder to the check joint of the liquid line stop valve, and then charge the refrigerant.

11. Fully open the liquid line stop valve after completing refrigerant charge.

12. Please be sure to perform the air-tight test.
    Note :

13. The spindle valve cap of stop valve is removed, due to internal 0-ring end thread will be opened, the whistle caused by gas emitting, which has nothing to do with the leakage.

14. Use tools and measuring Instruments only for the new refrigerant (R41 OA) which directly touch refrtgerant.

15. When pressure does not drop below-0.1 MPa (-750mmHg), it is considered that leakage exist&. Check for any gas leakage once again. If no leakage exists, operate the vacuum pump for one to two hours

DSW Setting With The Piping Length
When the piping length is below Sm or above 30m, DSW2 setting must be adjusted. Please follow the instructions below to reset.

Quantity Refrigerant Filling

1. The factory refrigerant charging weight of each model and standard piping length
   Calculate the additional piping length before filling additional refrigerant to ensure the required quantity of refrigerant. And then charge the appropriate amount of additional refrigerant. Please follow the calculation of additional refrigerant as shown below and 3-2 guidelines for additional refrigerant filling.

2. Calculating method of additional refrigerant.
   The calculation formula of piping length L (m)

3. If the length L (m) is less than 30m, it doesn’t need additional refrigerant.

4. If the length L (m) is more than 30m, it needs additional refrigerant.

Please charge the addltlonal refrigerant quantity W by the calculating method (2).

Refrigerant Recovery Methods
Follow the steps below to recover refrigerant from the outdoor unit before relocating the indoor and/or outdoor unit(s).

1. Please close the gas line stop valve, liquid line stop valve and the manifold gauge ..
2. Tum the AJC power.
3. Set DSW1-1 on the outdoor unit to ON (unit operation starts). Close the liquid line stop valve. Start refrigerant recovery.
4. When the low pressure (gas Hna stop valve) dlsplay–0.01 MPa (-75mmHg), quickly run the following actions:
5. Close the gas Interceptor valve.
6. Set DSW1-1 to OFF (unit operation stops).
7. Please tum off the power source.

Caution : Make sure pressure is not below -0.0lMPa. Presmre below -0.0tMPaG will cause compressor damage.

Electrlcal Wiring

CAUTION : All the fteld wiring and electrlcal components muet comply with local codea.

1. Electrlcal Work
   Please entrust qualified distributors, and according to relevant national laws and regulations for cons1ruction.

2. In electrical wiring, please use 3-phase /single-phase 220V ways. Select the wiring capacity according to the following essentials of wiring, power source wiring has two ways:

3. Power supply from the outdoor unit.

4. Power supply from indoor unit and outdoor unit separately.