Lennox G43UF SERIES - Page 24

OUTDOOR UNIT
A
TO VAPOR
SERI/ICE VALVE
B
~
A. WARNING
A IMPORTANT
1
CONNECT GAUGE SET
A Conneclan HFC-410A manifold gauge set h/gllllte5Sure
hose 10 Ihe vapor valve serl/ial port.
NOT!; - Normelly, Ihe high pressure hose Is connected to
Iheliquid line port. However, connecting II to tha vapor port
bItter protects the manirold gauge sel from high pl'Quure
damage.
B With both manifold valves closed, connecllhe c~lndor or
HFC-41 OArerrigel8ntle the ORnlRr port or the menlfold 9iIuge
set
NOTE - LeIer in Iha procedure,
the HFC-41 OA container will be
replBoed by the nitrogen
container.
.. -....,..-[)I
~
NITROGEN
U
~
2
HFC-410A
TEST FOR LEAKS
After the IIna SOL hes been oorllwcled 10 the indoor lind outdoor units. check Ihellne set connecllons and Indoor unit ror laaks. Usa lha
!allowing procedure to lesl ror leaks:
A With both manllOid Valvll6 cIo6ed, oanneclthe cylinder of HFQ.41 OA relrigerant to the cenler pari or the manllold gauge sel. Open the valve
on Ihe HFC-410A cylinder ("apor only).
B Open tha high ptltBture &ide of the manifold 10 allow HFC-410A Inle the finuel and Indoor unit WaIgh In a trace amounl of HFC-410A. fA
IroCllamounl is 8 mall/mum of two ounces (51 g) raMl1erant or three potlndl1 (31 /lPa) fJf"$ure}. CIO:Ie the wive on the HFCi-410A cylinder
and the valve on the hIgh pressure side 01 the mani~ld 9au9~ eel. Oieoonneclltll' HFc-410A cylinder.
Connect B cylinder of dry nitrogen with 8 pressure regulating valve to lhe canter port altho manifold gauge SOl.
o Adjust dy rV1rogRn pr1lISilll'Q to 150 pSig (1034llPa). Open \he wive mlhe high sjde or Ihe Irerlilold gauge set n Older 10 pre5sunzlllhe line geI
arxllhe Indoor un~.
E Af\or B rew mln\.l~, open Olle of the selVic6 valve ports and VII~1y that the reflfgetant added to 1118 systam earlier Is meBSurablo with B laek
detector.
F After leal< tellting dilloonnect gauges from serl/lce parts
Figure 10. Leak Test
Page 17
1JACX SERIES
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