Notices For Welding - Lennox VERDB01C432P Installation Manual

Vrf heat recovery distribution boxes
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Cooling and Heating Recovery Mode Exchanger
2) Take out the two silencers, insert nozzle ODΦ19(3/4) in silencer 1 to the high pressure gas pipe
on the left side of converter, then insert nozzle ODΦ28(1-1/8) in silencer 2 to the low pressure gas
pipe on the left side of converter, conduct welding;
NOTICE!
During welding, wrap up the pipe with wet cloth (as shown in the fig. 4.18).

4.2.2 Notices for welding

(1) Pipeline connection must adopt socket soldering welding. The gap between socket components
cannot be too big or too small to only make sure they won't fall down by relying on friction
force.
(2) Please note that protect thermal insulating sponge and solenoid valve in the pipeline. Please
wrap the pipeline with wet cloth to weld it for protection;
(3) Before welding the pipeline, please charge nitrogen at first. Nitrogen must be charged for
protection during the whole welding process and within 30s after welding is finished. The
nitrogen cylinder must be connected to the pressure control valve and the flow speed of nitrogen
should be controlled within 4~6L/min (air pressure: 0.02~0.05Mpa). During installation process,
Fig. 4.17
Fig. 4.18
Fig. 4.19
15

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