d. R410A refrigerating machine oil
Conventionally, mineral oil or a syntheti c oil such as alkylbenzen e ha s been used for R22 refrigerating ma chine
oil. Be caus e of the poo r compatibility betwe en R 410 A and conve ntional oils l ike m ine ral oil, h owe ver, ther e is a
te n de ncy for th e re fr i g er at i ng m a ch in e o il to co l le c t in the ref rigerating cy c le. F or thi s reason, polyester and
oth er s ynth etic oils whic h ha ve a high compa tibility w ith R 4 10 A a r e used a s refrige ratin g m achine o il.
Because of the hig h hygro scop ic p roperty of s yntheti c oil, more care must be t ake n in its hand ling tha n was
necessary with conventional refrigerat ing mac hine oils. Also, these sy nthe tic oils will degrade if m ixed with
mi nera l oil o r a lkylbe n zene , ca usin g cl oggi ng i n ca pil lary t ubes or compr es sor mal func tion. D o not mix t he m
unde r any c i rc u mstance s.
10.1.2 Safety Measure When Installing / Receiving Refrigeran t Piping
Cause the gas pressure of R410A is a pproximately 1.6 tim es as hi gh a s that o f R2 2, a mistake in insta llation or
servicing c oul d r es ul t in a major acci dent . It i s essen tia l tha t you u se R 41 0 a too l s and m ate r i als, and t ha t you
observe the fol lowi ng p recautions to ensure safety.
Do not u se a ny refrigerant other than R410A in Acs that have been used with R410A.
If a ny re fr ig e r ant g as lea k s w h il e yo u are wo rk in g , ve nt il a te th e ro o m. Toxi c g a s may b e ge n er at ed if refri g er an t
gas is exposed to a d irect flame.
When instal ling or transferring an A C, d o not allow any air or sub stance other than R410A to mix into the
refri geration cycle. I f it does, the p ressure in the r efrigeration cycle can b ecome abnormally high, possibly
causing an explosion and/or injury.
Afte r finishi ng the installation, check t o make sure there is no refrigerant gas leaking.
When installing or transferrin g an AC, follow the instructions in the i nstallation instructions caref ully. Incorrect
installation can r esult in a n ab nor mal refri geration cycl e or wat er leakage, elect ric s hock, fire, etc.
Do not perform any alterations on the AC unit under any ci rcumstances. Have all repair work do ne b y a spec ialist.
Incorrect repairs can result in an water leakage, electric shock, fire, etc.
10.2. TOOL FOR INSTALLING / SERVICING REFRIGERANT PIPING
10.2.1
Necessary Tools
In ord er to preven t an R41 0AA C fr o m m i st a ken ly b e ing c ha r ged wi th any oth e r refrigerant, the diamet er of the 3-way
valve service port on the outdoor unit has been changed.Also, to increase its ability to withstand pressure, the
oppo sing dimensions have be e n c h an g ed fo r t he refrigerant pip e fl a r ing s ize and f lar e nut. A ccor di ngly, w hen
instal li ng or servicing r efrigerant pipin g , you m u st h a ve b ot h the R410A and ordinar y tools li sted below .
1.
2.
3.
4.
5.
6.
Type of work
Flar ing
Bending, connecting pipes
Air p urging
Gas leak inspection
Table 3 Tools for installation, trans ferri ng or replacement
Ordinary tools R410A tools
Fl aring t ool (cl utc h type), p ipe cut ter, re am er
To rque wrenc h (nominal diameter 1/4,
3/ 8,1 /2) Fixed s pann e r (op posing side s 12
m m , 17 m m, 19 mm ) Adj us tabl e wre nch,
Sp ring b ender
Vacuum pump H exa g onal w rench
(o pposin g sides 4 mm )
Ga s leak inspec tion fl uid or s oapy water
Cop per pip e gau ge for cleara nc e
Adju stmen t, flari ng too l (clutc h type ) *1)
Mani fold gauge, c h argin g hos e, vac uum
pump adap tor
Electric gas leak detector for HFC
refrigerant*2)
*1) Yo u can use th e conventional (R 22) flaring tool . If you ne ed t o bu y a n ew t ool, buy the R41 0A ty pe.
*2) Use when it is nec e ssary to detect smal l gas leaks.
*For o the r installa tion wor k, you sh ould have th e usual t ools , su ch as screwdrivers (+ ,-), a me tal-c utting sa w, a n
e lectrical drill, a hole core drill (65 or 70 dia .), a t ape me asu re, a l ev e l, a t her mom eter, a clamp me ter, an insulation
tester, a voltmet er, etc.
Table 4 Tool for serving
Type of work Ordinary tools
R410A tools
Refrigerant charging
Brazing (Repl acing refrigerat ing
cycle part*1)
Nitrogen blow set (be sure t o us e n itrogen
blowin g fo r all b razing ), and brazin g), an d
bra zing machine
Electro nic scale for refr iger ant c har ging
Refriger an t cyl in der Ch arg ing o rific e and
pack ing fo r refr ig erant cylinde r
*1) Always replac e the dryer o f t he out d oo r u nit at the s a me t ime. Th e replaceme nt dr yer is wrapp ed in a v a cu u m
pack. Repl ace it last among t he refriger ati n g c y c le part s. Start brazing a s soon as you ha v e o p ened t he vacuum pack,
and begin the v ac uuming
40
&6U:*.( &8U:*.( &6U:*.( &8U:*.(
&63:*.;&83:*.;&63:*.;&83:*.;
To Next Page
Loading...
