Daikin GYEQ20AN Service Manual page 65

SiAUY361411EA
7 Installing the Outdoor Unit
Fuel gas pipe
The piping to the outdoor unit should use metal pipes and have the following parts installed.
Use a white (zinc plated) pipe for the gas pipe.
Use a reinforced gas hose (approved for gas) or low-pressure gas hose with a joint fixture for
liquefied petroleum gas to link the fuel gas piping to the outdoor unit.
As needed depending on the degree of contamination inside the fuel pipe due to piping work, install
a strainer between the reinforced gas hose and the cock.
The outdoor unit, particularly when installed on a vibration-proof stand, shakes a lot at start-up. Pay
attention to where you lay out the reinforced gas hose.
To seal the threads, use a liquid sealant such as Tight Seal. Do not use seal tape, which may get
caught in the valve seat of the gas regulator, resulting in gas leak.
After you have finished connecting the pipes, use soap solution to check the connections for leaks.
The gas supply pressure at the outdoor unit inlet should be adjusted to meet the conditions specified
in the table below.
Max. gas pressure
Standard gas pressure
Min. gas pressure
When required by national or regional legislation, a low gas pressure switch has to be mounted in the safety loop.
Installation must comply to local and national standards or legislation.
Manual gas valve
Recharging refrigerant
Amount of recharged refrigerant
The amount of recharged refrigerant (R) is calculated based on the fluid pipe sizes and lengths
(actual lengths) of the extended piping.
Use the formula below to calculate the amount of recharged refrigerant, and recharge that amount of refrigerant.
The value of R should be rounded off in units of 0.1 kg.
( Total length of )
R= x 0.25
pipes [m]
Outdoor unit capacity
Refrigerant correction amount
CAUTION
CAUTION
Recording the filled refrigerant amount
When you refill the chlorofluorocarbon refrigerant, record the type and quantity of the chlorofluorocarbon on the
sticker attached above the stop valve on the outdoor unit's terminal box cover. Use an oil-based marker or similar.
Since the outdoor unit is shipped with 11.8 kg of refrigerant already charged, the amount of
recharged refrigerant should be carefully determined at the site (using the formula described above).
Device Overview
(Unit: kPa)
Natural gas
2.5
2.0
1.7
Weather protection
Filter Low pressure switch
Pressure test point Pressure regulator
( Total length of ) ( Total length of
+ x 0.17 +
pipes [m] pipes [m]
GYEQ20AN GYEQ30AN
6.4 kg 13.9 kg
R410A must be charged as liquid refrigerant.
Flexible hose
LG
Pressure test point
Solenoid valve
) ( Total length of ) ( Total length of
x 0.11 + x 0.054 +
pipes [m] pipes [m]
– 26 –
Installation Work Manual
Outdoor unit
059072-00EN00
)
Correction amount
x 0.022 ×1.15+
(value shown in
table below)
0FGHP-EN0801 DGJ002
54