Additional Refrigerant Charge; Before Adding Refrigerant; Checking The Refrigerant Tank; Adding Refrigerant - Daikin VRV IV-S Series Installation Manual

8.

ADDITIONAL REFRIGERANT CHARGE

WARNING
• When leaving the unit with the power on, be sure to
switch with another person doing the installation or close
the front panel.

8-1 Before adding refrigerant

• Make sure the following work and inspection is complete, in accor-
dance with the installation manual.
• Piping
• Wiring
• Airtightness test, Vacuum drying

8-3 Adding refrigerant

Filling after calculating the amount of refrigerant to add
1. Calculate the amount of refrigerant to add as described in "Calculating the
amount of refrigerant to add" in "7. PRECAUTIONS ON
REFRIGERANT PIPING".
2. After the vacuum drying is finished, open valve A and charge the calculated
amount of refrigerant through the service port for the liquid-side stop valve.
3. Close valve A after charging is complete.
Note: If all the refrigerant to be added cannot be charged using the above
procedure, right-hand the procedure below and re-charge the refrigerant.
If all the refrigerant could not be added
Add refrigerant using the following procedure. See the "Service Precautions" plate
attached to the outdoor unit for details on the settings for adding refrigerant.
9.

POST-WORK CHECKS

Perform the following checks after work is complete.
(1) Drain pipe connection, removal of transport clasp 
See "5. PRECAUTIONS ON INSTALLATION".
(2) Incorrect power supply wiring, loose screws 
See "6-3 How to connect the power supply wiring".
(3) Incorrect transmission wiring, loose screws 
See "6-4 Transmission wiring connection procedure".
(4) Incorrect refrigerant piping connections 
See "7. PRECAUTIONS ON REFRIGERANT PIPING".
(5) Piping sizes, use of insulation 
See : "7-1 Selecting piping material".
"7-5 Heat insulation of piping".
(6) Stop valve check 
Make sure both the liquid-side and gas-side stop valves are open.
(7) Record of Amount of Refrigerant Added 
Record it on "Record of Amount of Refrigerant Added" on the "Ser-
vice Precautions" plate.
(8) Measuring the insulation of the main power circuit 
• Use a 500V mega-tester.
• Do not use the mega-tester for weak currents other than 208/230V.
(Transmission wiring)
CAUTION
To the pipe-layer
After completing installation, be sure to open the valve.
(Operating the unit with the valve shut will break the compressor.)
12

8-2 Checking the refrigerant tank

• Check whether the tank has a siphon pipe before charging and place
the tank so that the refrigerant is charged in liquid form. (See the fig-
ure below.)
Tank with siphon pipe
There is a siphon
pipe inside, so the
cylinder need not be
upside-down to fill
with liquid.
(Stand the cylinder
upright when filling.)
Status of the Stop valve and other valves when adding refrigerant
• See "Stop valve operation procedure" in "7. PRECAUTIONS ON REFRIGERANT PIPING" for
details on how to use the stop valve.
(Refer to figure 28)
1. R410A Tank (Siphon system)
2. Measuring instrument
3. Valve A
4. Indoor unit
State of valve A and the stop valve
Before starting to charge the refrigerant
During charging of the refrigerant

10. TEST RUN

This unit is equipped with a crank case heater to ensure smooth
startup. Be sure to turn the power on at least 6 hours before oper-
ation in order to have power running to the crank case heater.
WARNING
When leaving the unit with the power on, be sure to switch
with another person doing the installation or close the front
panel.
Precautions before turning the power on
• Using insulating sheets, tape electric parts as described in the "Ser-
vice Precautions" plate on the back of the front panel.
• All indoor units connected to the outdoor unit operate automatically.
Complete work on the indoor units in order to ensure maximum safety.
10-1 Power On–Check Operation
• Make sure to perform the check operation after installation.
(If the air conditioner is operated using the indoor remote controller
without performing the check operation, the malfunction code "U3" is
displayed in the indoor remote controller, and normal operation is
disabled.)
• When making settings on the outdoor unit PC board (A1P) after turn-
ing the power on, do not touch anything other than the push-button
switches and dip switches.
(See the "Service Precautions" plate for the locations of the push-
button switches (BS1-5) and dip switches (DS1-1, 2) on the PC
board (A1P).)
Other tanks
Stand the tank
upside down and
charge.
5. Stop valve service port
6. Gas line stop valve
7. Outdoor unit
8. Liquid line stop valve
Liquid line Gas line
Valve A
stop valve stop valve
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