Daikin FBQ100D_RZQSG100L9V [16/52] Checking the refrigerant piping
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Daikin FBQ100D_RZQSG100L9V [16/52] Checking the refrigerant piping

Daikin FBQ100D_RZQSG100L9V [16/52] Checking the refrigerant piping
6Installation
Installerreferenceguide
16
RZQG71~140L_V1+Y1+RZQSG100~140L_V1+Y1
Splitsystemairconditioners
4P3855221–2014.08
d
e
f
b
a
c
6 If the outdoor unit is installed above the indoor unit, cover the
stop valves (f, see above) with sealing material to prevent
condensedwateronthestopvalvesfrommovingtotheindoor
unit.
NOTICE
Anyexposedpipingmightcausecondensation.
7 Reattachtheservicecoverandthepipingintakeplate.
8 Sealallgaps(example:a) to prevent snow and small animals
fromenteringthesystem.
a
WARNING
Provideadequatemeasurestopreventthattheunitcanbe
used as a shelter by small animals. Small animals that
makecontactwithelectricalpartscancausemalfunctions,
smokeorfire.
NOTICE
Precautionswhenmakingknockoutholes:
▪ Avoiddamagingthecasing.
▪ After making the knockout holes, we recommend you
remove the burrs and paint the edges and areas
aroundtheedgesusingrepairpainttopreventrusting.
▪ When passing electrical wiring through the knockout
holes, wrap the wiring with protective tape to prevent
damage.
b
c
a
a Knockouthole
b Burr
c Sealantetc.
NOTICE
Make sure to open the stop valves after installing the
refrigerantpiping and performingvacuumdrying. Running
the system with the stop valves closed may break the
compressor.
6.4.9 Todetermineifoiltrapsarerequired
Ifoilflowsbackintotheoutdoorunit'scompressor,thismightcause
liquidcompressionordeteriorationofoilreturn.Oiltrapsintherising
gaspipingcanpreventthis.
If Then
Theindoorunitisinstalled
higherthantheoutdoor
unit
Installanoiltrapevery10m(height
difference).
a
b
10 m
aRisinggaspipingwithoiltrap
bLiquidpiping
Theoutdoorunitis
installedhigherthanthe
indoorunit
OiltrapsareNOTrequired.
6.5 Checkingtherefrigerantpiping
6.5.1 Aboutcheckingtherefrigerantpiping
Theoutdoorunit'sinternalrefrigerantpipinghasbeenfactorytested
for leaks. You only have to check the outdoor unit's external
refrigerantpiping.
Beforecheckingtherefrigerantpiping
Makesuretherefrigerantpipingisconnectedbetween the outdoor
unitandtheindoorunit.
Typicalworkflow
Checking the refrigerant piping typically consists of the following
stages:
1 Checkingforleaksintherefrigerantpiping.
2 Performing vacuum drying to remove all moisture, air or
nitrogenfromtherefrigerantpiping.
If there is a possibility of moisture being present in the refrigerant
piping (for example, rainwater may have entered the piping), first
carryout the vacuumdrying procedure belowuntilall moisturehas
beenremoved.
6.5.2 Precautionswhencheckingthe
refrigerantpiping
INFORMATION
Also read the precautions and requirements in the
followingchapters:
▪ Generalsafetyprecautions
▪ Preparation
NOTICE
Use a 2stage vacuum pump with a nonreturn valve that
can evacuate to a gauge pressure of −100.7 kPa (5 Torr
absolute).Makesurethepumpoildoesnotflowoppositely
intothesystemwhilethepumpisnotworking.

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