Lennox G43UF SERIES - Page 25

1
c
MANIFOLO
CONNECT GAUGE SET
GAUGE SET
NOTE - Remove coras from service valves (II nol "Iready donE!).
.,
A
Connecl low side of manifold gauge set
wilh 1/4 SAE in-line tee 10 vspor line
servlclI vall/II
B
Connect high side of manifold gaugll
let 10 lIquid line service valva
Connact micron gauQe available
connector on \1'19 1/4 SAE in-line lee.
D
Connect the lIacuum pump (wilh
lIacuum gauge) 10 the oenler port of lI1e
manlfuld gauge 8lll The oenter pori fine
will be U!led later for both the HFC410A
and nitrogen oonlalners.
A34()OQ 1/4 SAl; TeE WITH
SWIVEL COUPLER
c
MICRON ~B;~_I1U~~
GAUGE t
TO VAPOR
SERVICE VALV~
:l
II
!J!~HlIJIJlIw~I!lfli1
TO LIQUID LINE
SeRViCe VALVE
i3:D
•
VACUU PUMP
o
t
ReCOMMENO
MINIMUM 316" HOSE
2
EVACUATE THE 5YSTEM
A Open both menifold v81ves snd start the vacuum pump.
B Evacuate the line Sill and Indoor LJnilto an8beoMe pre •• ure or 23,000 microns (29.01 Inches of mercury).
NOTE - DUling the early stilges of evacuation. it is desirable to dose the manifold gauge v;llve et lellat Ol"ce, A rapid lise in pressure indical6s a
rel"llvely
181ge leak. If Ihis occurs. repeat the leak llllting procadu....
NOTe - The term absolule prellure means ttle IoLaI actlJal p,eSGul. WIthin II given volume or system. above Ihe absolule zlIro or prllssul'll.
Absolute pressure In a vacuum Is equal to atmoGphelic prea6Urll minus vllcuum pressure.
e Whan !he ablolul8 pressul'Q roaches 23.000 micron. (29.01 inches of mercury). close the manifold gauge valvllS, tum off Ihe IISCUUIn pump
and dlsoonnaet lho manifold geuge center port hose from vacuum pump. Attach the manifold conl&r port hOl:oto a dry nitrC!gen cylinder with
pressure regUlator sello 150 pslg (1034 kPa) and purge the hOGe, Open the mllnilold gauge valves 10 break !he vacuum In the line sel and
indoor unil. CI06e the manifold gauge IIall/es.
D Shu I ort Itle dry nitrogen cyllndar and remove the manifold gauge hose from !he cylinder. Open !he manifold gauge valves 10 rolease Ihe dry
nitrogen from the line eel and indoor unil.
E R9coonoctlhe manifold giluge 10 ltle vacuum pump. tum !he pump on, and oondnue to svaeual& the liM Gal and indtlQr unil until the absolute
pr9&Gul& doeG nof rise ebove 500 miaons (29.9 InchllS or mercury) within S 2(}.mlnule period Bfler shutting orr the vacuum pump lIT1d closing
Ihe manifold gauge valves.
F Whan the ablolu18 presGLJro requh'emenl above hes been met. disoonnect !he manifold hose from thll vacuum pump and cormectillo an
uprightcyllndor of HFC41 OA refrigeranl. Open !he manifold gauge valVe 1 10 2 pslg ITl ordllr to I'llIQQSe ltIa vse:uum In the line Gel ilnd indoor
unil.
G Perform the following:
• CIOlle manifold gaugo vell/ee.
• Shut orr HFC-410A cylinder.
• Reinstall service valve cores by remt)u1ng manifold hose from service valva. Quickly install cores with core
tool while maintaining e poGlUlie eyslem pressure.
Replace the stem caps and secure nTlger light, then tighten an additional one-sixth (1/6) or a turn as
illustrated.
Figure 11. Evacuating System
Page 18
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