DAIKIN VRV System Air Conditioner Instruction Manual

1-4 Checklist

Exercise particular care concerning the following items during installation work and check again after installation is complete:

Post-installation checklist

Delivery checklist

2 . SELECTING INSTALLATION SITE

Consider the following requirements when choosing the installation location and obtain the customer’s consent:

• The location must be able to withstand the weight of the Branch Selector unit.
• The location must allow inspection holes to be installed on the control box side. (A separate opening is necessary when lowering the product.)
• There must be adequate space in which to perform installation and service work. (Refer to Fig . 1 .)
• The length of pipe to the indoor unit and outdoor unit must be less than or equal to the permissible pipe length (as listed in the installation manual included with the outdoor unit).
• Refrigerant circulated through the pipes can generate sound. Ensure that the installation takes necessary precautions when installing in a sound sensitive applications.

(1) Leave enough space to connect the field pipes.
(2) This space is needed to place the top plate when performing service on EV coil.
(*3) This space is needed to remove the top plate when performing service on EV coil.

WARNING
Securely install the unit at a location that is capable of withstanding its weight . Inadequate strength may cause the Branch Selector unit to fall, resulting in bodily injury.

CAUTION

• Leave enough space to perform maintenance on the control box.
• To prevent video and audio interference, install the Branch Selector unit as well as associated power supply wiring and transmission wiring at least 3.5 ft. (1 m) away from TVs and radios. However, depending on the reception, interference may result even if a minimum distance of 3.5 ft. (1 m) is maintained.

3 . PREPARATIONS BEFORE INSTALLATION

Install suspension bolts and hanger brackets as illustrated in the diagram below .

• Use a suspension bolt size of 3/8 in.(M8) to 7/16 in.(M10).
• Use mold-in inserts and embedded foundation bolts for new installations or hole-in anchor bolts or similar hardware for existing installations, taking care to install in a manner that can withstand the unit’s weight.

4 . BRANCH SELECTOR UNIT INSTALLATION

Use only accessories and parts that conform to the designated specifications when installing the unit .

1. Position the Branch Selector unit and secure it temporarily in place.
   Attach the hanger brackets to the suspension bolts as per the instructions in the figure on the right. Be sure to affix nuts (3/8 in.(M8) or 7/16 in.(M10), 3 pieces in  4 locations) and washers (for 3/8 in.(M8), outside diameter of 15/16 in. (24 mm) to 1-1/8 in. (28 mm) or for 7/16 in.(M10), outside diameter of 1-3/16 in. (30 mm) to 1-5/16 in. (34 mm): 2 pieces in 4 locations) (to be supplied in the field) from both the top and bottom of the hanger brackets on both sides of the unit to secure it in place.

2. Adjust the height of the unit as desired.

3. Using a level, verify that the unit has been installed in a level orientation.

WARNING

• Install the Branch Selector unit in a level orientation. (Vertical installation is not permitted.)
• Attach nuts on both the top and bottom of the hanger brackets. Overtightening the lower nut without the upper nut in place may cause the hanger bracket and top plate to deform, causing the unit to produce abnormal noise.

5 . REFRIGERANT PIPING WORK

• For instructions for installing piping between the outdoor unit and the Branch Selector unit, selecting a refrigerant branch kit, and installing piping between the refrigerant branch kit and indoor units, refer to the installation manual included with the outdoor unit.
• Before beginning the work, be sure to verify that the type of refrigerant used is R410A. (The unit will not operate correctly with a different type of refrigerant.)
• Insulate all of the piping, including the liquid pipes, high/low pressure gas pipes, suction gas pipes, gas pipes, and the pipe connections for these. Not insulating these pipes could result in water leaks or burns. In particular, low-temperature gas flows in the high/low pressure gas piping during full cooling operation, so the same amount of insulation as used for the suction gas pipes is required. In addition, high-temperature gas flows in the high/low pressure gas piping and gas piping, so use insulation that can withstand more than 250°F (120°C).
• Select insulation material as necessary for the installation environment. For details, refer to the Engineering Data Book. If you fail to do so, condensation could form on the surface of the insulation.

5-1 Pipe size selection

Select the size of piping between the outdoor unit (refrigerant branch kit) and the Branch Selector unit and between the Branch Selector unit and indoor units (refrigerant branch kits) based on example connections 1 and 2 below and Tables 3, 4 and 5.

NOTE

• If the number of indoor units to be connected is less than the number of branch ports (so that there are empty branch ports left, or if you plan to increase the number in the future), any of the branch ports can be left unused. Ensure to follow appropriate procedure for closing the unused ports.
• If you plan to add new indoor units in the future, select a pipe size based on the total indoor unit capacity before addition of new units. Do not select a pipe size based on the total future capacity. It will result in abnormal operation. If piping size doesn’t change before and after extension, extension will be allowed.
• For more information about extension, contact your Daikin sales representative.

5-2 Pipe connection work precautions

Connect the pipes .

• Braze (2) refrigerant pipes after nitrogen replacement (replacing air with nitrogen while allowing nitro-
  gen to flow inside the refrigerant pipe (1)). (Refer to Fig . 2 .) (1) The pressure regulator for the nitrogen released when doing the brazing should be set to about 2.9 psi (0.02 Mpa) (enough to feel a slight breeze on your cheek).
  (2) Do not use flux when brazing the refrigerant pipe.
  Use phosphor copper (B-Cu93P-710/795: ISO 3677), which does not require flux, as the filler metal for brazing. (Using chlorine flux may cause the pipes to corrode, and if it contains fluoride it may cause the refrigerant lubricant to degrade, adversely affecting the refrigerant piping system.)

CAUTION

• Do not use an anti-oxidizing agent when brazing the piping. (Residual debris could clog the piping or cause parts to malfunction.)
• For more information about outdoor unit refrigerant pipes, see the installation manual included with the outdoor unit or the Engineering Data Book. (Failure to purge air from the pipes or fill additional refrigerant may result in an insufficient volume of refrigerant in the pipes or other problems, causing the equipment to malfunction [for example, to not cool or heat properly].)

5-3 Piping connection

(1) Indicates field pipe.
(2) Reducers may be required (field supply) if the field pipe size does not suit on the pipe size of the Branch Selector unit (Table 5).

If there are branch ports left unused (not connected to an indoor unit)

• If there are unused branch ports, use stopper pipe (Accessory (4)). If there are many unused branch ports, be sure to use an optional Closed pipe kit (KHFP26A100C).

5-4 Airtightness test and vacuum drying

• After completing refrigerant piping work for the indoor units, Branch Selector unit, and outdoor unit, conduct an airtightness test and vacuum drying. For more information about the airtightness test pressure, refer to the outdoor unit’s installation manual.

5-5 Piping insulation

• After the gas leak inspection is completed, refer to the following figures and use the included insulation tube (Accessory (2)) and clamps (Accessory (1)) to apply the insulation.

CAUTION

• Insulate all of the piping including the liquid pipes, high/low pressure gas pipes, suction gas pipes, gas pipes, and the pipe connections for these. Not insulating these pipes could result in water leaks or burns. In particular, low-temperature gas flows in the high/low pressure gas pipes during full cooling operation, so the same amount of insulation as used for the suction gas pipes is required. In addition, high-temperature gas flows in the high/low pressure gas piping and gas piping, so use insulation that can withstand more than 250°F (120°C).
• When reinforcing the insulation material in accordance with the installation environment, also reinforce the insulation on the piping protruding from the unit. Insulation material required for reinforcement work should be supplied in the field. For more information, refer to the Engineering Data Book.
• If the taping or clamps of the insulation material is tightly wound, the thickness of the insulation material will decrease and it will lead to deterioration of the insulation performance.

CAUTION

• Wrap insulation material with the seam facing up to prevent condensation from leaking through it. (Refer to Fig . 3 .)

6 . ELECTRIC WIRING WORK

6-1 General instructions

• All wiring must be performed by an authorized electrician.
• All field supplied parts and materials, electric works must conform to local codes.
• Always ground wires. (In accordance with national regulations of the pertinent country.)
• Always turn off the power supply before performing the electric wiring work.
• Follow the “WIRING DIAGRAM” attached to the control box cover to wire the outdoor unit and indoor units.
• Properly connect wire of the specified wire type and copper thickness. Also use the included clamp to avoid applying excessive force to the terminal (field wire, ground wire).
• A disconnection incorporated in the fixed wiring is to be provided. Use an all-pole disconnection type breaker with at least 1/8 in. (3 mm) between the contact point gaps.
• Do not let the ground wire come in contact with gas pipes, water pipes, lightning rods, or telephone ground wires.
  • Gas pipes: gas leaks can cause explosions and fire.
  • Water pipes: cannot be grounded if hard vinyl pipes are used.
  • Telephone ground and lightning rods: the ground potential when struck by lightning gets extremely high.
• A circuit breaker capable of shutting down the power supply to the entire system must be installed.
• This system consists of multiple Branch Selector units. Mark each Branch Selector unit as unit A, unit B . . . , and be sure the symbols on the terminal blocks to the outdoor unit and indoor unit are properly matched. If wiring and piping between the outdoor unit, Branch Selector unit and an indoor unit are mismatched, the system may cause a malfunction.
• Do not turn on the power supply (branch switches, overload interrupters) until all other work is done.

6-2 Example for the whole system

6-3 Power supply circuit, safety device and cable requirements

• A power supply circuit (refer to Table 6) must be provided for connection of the unit. The circuit must be protected with safety devices in accordance with local and national codes i.e. a fuse, a circuit breaker or a GFCI.
• When using residual current operated circuit breakers, be sure to use a high-speed type (0.1 second or less) 30mA rated residual operating current.
• Use copper conductors only.
• Use insulated wire for the power supply.
• Select the power supply cable type and size in accordance with relevant local and national regulations.
• Use vinyl cord with sheath or cable (2 wire) of AWG 18 – 16 for transmission wiring. · The transmission wire lengths are as follows: Between the Branch Selector unit and indoor units: Max. 3,280 ft. (1,000 m) Between the Branch Selector unit and outdoor unit: Max. 3,280 ft. (1,000 m) Between Branch Selector units: Max. 3,280 ft. (1,000 m)
  Total wiring length: 6,560 ft. (2,000 m) or less

NOTE

• The above Table 6 of electrical characteristics refers to one Branch Selector unit.

6-4 Wiring example

WARNING
Install circuit protection safety devices in accordance with local and national codes . Failure to install circuit protection safety devices in accordance with local and national codes may result in electric shock or fire.

• A transmission wiring example is shown below.
• Connect “TO IN/D UNIT (F1, F2)” terminals on the printed circuit board of the outdoor unit to “OUT- DOOR UNIT (F1, F2)” terminals of the first Branch Selector unit.

NOTE

1. Connect the cooling-only unit to “BS UNIT (F1, F2)” terminals of the final Branch Selector unit.
2. This wiring example applies when joining the C and D branch ports and connecting them to indoor unit. The terminal block to which the transmission wiring is connected can be connected to either indoor unit C or indoor unit D. However, the DIP switches must be set appropriately. For more information about how to set DIP switches, refer to “7 . INITIAL SETTING”.
3. The maximum number of indoor units connected to one branch port is 5.

CAUTION

• Use 2-core transmission wiring. Using the same wire with 3 or more cores to connect 2 or more indoor units may cause them to stop with an error.
• When shielded wire is used, be sure to ground one side of the shielded wire. The total wiring length is 4,920 ft. (1,500m) when shielded wire is used.
• Be sure to use ring type crimp style terminals with insulation sleeves to connect wires to the power supply terminal block. (Refer to Fig . 4 .)

• Do not use with the power supply terminal block and ground terminal connected to wiring for another circuit.
• Do not pre-solder stranded wire.
• Connect wires securely so that the terminals will not be subjected to external force.
• Use an appropriately sized screwdriver to tighten the terminal screws. Use of a screwdriver that is too small could damage the screw head and prevent proper tightening.
• Overtightening the terminal screws could damage the screw. Refer to the table for the terminal screw tightening torque.

• Never connect power supply wiring to the transmission wiring terminal block. Doing so may damage the entire system.
• A daisy chain configuration is required for transmission wiring. Transmission wiring cannot be branched again after the initial branch. (Refer to Fig . 5 .)

6-5 Wiring connections

• Transmission wiring Remove the control box cover and connect the wires to the transmission wiring terminals (outdoor unit F1 and F2, Branch Selector unit F1 and F2, and each indoor unit (for example, for the BS12Q54TAVJ, indoor unit A through L) (F1 and F2)).
  At this time, pass the wiring into the unit through the wiring through hole and use the included clamp (Accessory (1)) to securely hold the wires. For more information about how much insulation to strip off transmission wiring, refer to the following figure.

CAUTION Verify that the piping line coincides with the transmission wiring

• Power supply wiring and ground wires Remove the control box cover and connect the power supply wiring to the power supply terminal block (X1M). Also connect the ground wiring to the ground wire terminal. Pass both the power supply wires and the ground wiring together through the conduit hole (left) into the control box and use the included clamp (Accessory (1)) to securely hold the wires in place. Be sure to wire the ground wiring so that it comes out of the cut out slit in the cup washer. (Not doing so could cause insufficient ground wire contact, causing the wire not to function as a ground.) For more information about how much sheath to strip off power supply wiring, refer to the following figure.

WARNING
Organize the wiring and securely reattach the control box cover. Pinched wires or a loose control box cover could result in electric shock or fire.

CAUTION

• When fastening the wire, use the included clamp (Accessory (1)) so as not to apply tensile force to the wire connection and then securely fasten the wire. Also, after the wiring is completed, organize the wiring so that the control box cover does not pop up and then properly replace the control box cover. Make sure no wires are pinched when replacing the control box cover. Always use the wire through hole to protect wires.
• Do not pass the transmission wiring and power supply wiring through the same locations, and outside of the unit keep them separated by at least 2 in. (50 mm). Not doing so could cause the transmission wiring to pick up electric noise (external noise) and result in a malfunction or breakdown.
• After the wiring work is complete, use sealer (to be supplied in the field) to seal closed the conduit hole. (Entry by small animals, etc., could cause a malfunction.)
• As shown in the figure on the right, wrap the transmission wiring between each Branch Selector unit and indoor unit with finishing tape (to be supplied in the field).

7 . INITIAL SETTING

7-1 Settings in the field

Follow the instructions below to set the DIP switches as necessary.

WARNING
Electric shock hazard! Before performing work, be sure to disconnect any power source connected to the unit .

Procedure

1. Disconnect the power source.
2. Set the DIP switches (DS1, DS2) for the corresponding branch ports based on the following table.
3. Once work is complete, be sure to close the control box cover.

< Setting>

1. Setting for branch ports to which no indoor unit is connected

2. Setting when joining branch ports

8 . ADDING AN ADDITIONAL CHARGE OF REFRIGERANT

Follow the instructions in the installation manual included with the outdoor unit to add an additional charge of refrigerant.

9 . CHECK OPERATION AND TEST OPERATION

1. Verify that the control box cover is reattached to the control box.
2. Refer to the installation manual included with the outdoor unit and conduct a check and a test run
   after all the work on the Branch Selector unit and outdoor and indoor units is completed and the operational safety of the units is confirmed.
   • You will hear the motor operated valve operating for about 90 seconds as it is automatically initialized (closed) after power is turned on, but this is not a problem.
   • System malfunctions can be verified by means of the following methods: Indication on the remote controller Overall system malfunctions, including the Branch Selector unit, can be identified using the LCD display on the remote controller. For more information about the malfunction display and its significance, refer to the installation manual included with the outdoor unit.

DAIKIN MANUFACTURING COMPANY, L.P.
Daikin Texas Technology Park,
19001 Kermier Road,
Waller, TX, 77484, U.S.A.

3P405106-12C EM20A009 [2105] HT

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>