Lennox G43UF SERIES - Page 21

2
CAP AND CORE REMOVAL
1
CUT AND DEBUR
Remove service cap and coro
Cui ends of the refriglmmt lines squllre
'rom
bIJth the Vllpor and liQUid lInG
(free from nicks or dent~) lind debur lhe
service ports.
ends. Tho pipa mull remoin round lind do
not pinch ond of the line,
3ATTACHED GAUGES
A
B
DUTbOO"
UNIT
ATTACH
GAUGES
INDOOR
UNIT
SERVICE PORT MUST BE OPEN TO AllOW EXIT
POINT FOR NITROGEN
\
VAPQRLlNE
SERVICE
VAPOR UNE VALVE
/ /
Connl'Ot gouge sellaN pross\I/'G $Ide to liquid line servles valve.
Connect gauge sel center por1 to bottle 01 nitrogen with reg\llalor.
lIaUID LINE SERVICE ~A
VAlVE
lIQUJDll,."
/
S
NITROGEN
VS~ REGULATOR TO flOW
NITROGEN AT 1 TO 2 PSIG.
WRAP SERVICE VALVE
FLOW NITROGEN
To protect componllnts during brazing, wrap a wet cloth
Flow Rlg\llaled nitrogen (at 1 to 2 P5i9) through the mlrfgerallon gallge
Braund the liquid line SIlNlca valve body ond CDppllr lube 6l\lb
SIlt InlO the valve slem pon conn9CIion on the liquid line seNlc", vilive
4
5
and U90 Bnolher wot cloth IInder· neath the valve body to
and out orItte valve 818m port oonnection on the vapor service valve,
prolect the base paint.
NOTE - The refrigerant metering deVice
located lit 1116 indoor roll will allow low pressure
nilrogento ftow Ihl'Ough the system,
USE REGULATOR TO
FLOW NITROGEN AT 1
T02PSIG
6
BRAZE LINE SET
7
INSTALL SERVICE PORT CAPS ONLY
After all oonnlldlons have been brtlZed, disconnllct mMifold gliluge
Breze the liquid IIn8 to the liqUid line service valve. Tum oIf
I!9t frcm serviOll ports, cool down piping with wet rag and romove 1111
nllrogenftow.
wrllppings.
Do not relnslall cores untllllller evacuation procedvre.
Rein61e11 serviOll port ClIpS" desired to clQ~e olf refrigerant pons.
POINT FLAM!! AWAY FROM
SERVICE VALVE
SERVICE PORT
Figure 7. Brazing Connection$
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