Gree HOME GMV Инструкция по эксплуатации онлайн [187/367] 48267

Gree HOME GMV Инструкция по эксплуатации онлайн [187/367] 48267
Dc Inverter VRF plus Water Heater Solution Service Manual INSTALLATION
183
10.7 Welding of Copper Pipe
1Braze welding
Materials for braze welding
There are two kinds of braze welding, soft braze welding and hard braze welding. Hard braze
welding is required in this case.
Selection of braze welding
Red copper + red copperbrazing filler metal is Bcu93PGB 6418and welding flux is not needed.
Flame flux: capable of preventing the surface of copper pipes from oxidation, recommended for
use.
Temperature for braze welding820-860 (copper pipe becomes light red)
2Safety acknowledgement before operation
a. Safety acknowledgement before operation
b. Acknowledgement on work suitshelmets, clothes, safety bags and safety shoes
c. Description of work location and environment
d. Job division shall be made. Job content, method and order shall be indicated. Risk prediction
activities shall be performed.
e. “Construction Schedule” shall be worked out.
f. Head of each group shall be assigned.
g. Risks of occurrence of an accident such as electric shock or fire shall be indicated.
h. Instructions on how to use electric machinery properly shall be available.
i. Locations marked with “Staff Only” shall be indicated.
j. An application is necessary for use of open flame and shall be reviewed by on-site safety officer
for approval.
k.Instructions given by fire authorities shall be accepted in accordance with local laws and
regulations.
l. Tools shall be sorted and counted. Upon knocking off for the day, tools shall be sorted and
counted. If necessary, the piping system shall be charged with coolant to avoid exhaustion.
a. Construction personnel must have relevant operation qualification.
Flame operation must be undertaken by qualified persons in accordance with local laws
and regulations.
b. Wear coveralls (cotton for the best), safety shoes, safety helmet, leather gloves, protective
goggles and anti-dust mask.
Welding torch with back fire arrestor shall be used to ensure safety.
c. Take care not to be burned by flame and heating parts.
d. Gas cylinder shall be handled carefully to prevent leakage.
e. Combustible substances in the surrounding areas shall be moved away. If movement is
impossible, fire proofing treatment shall be taken properly, such as being covered by
flame-proof enclosure.
f. Good ventilation is necessary to avoid breathe in of harmful gas.
g. Appropriate measures shall be taken if there is a safety problem.
h. Operation on connectors of branch pipes as well as on the surrounding of pipe ends shall be
performed on the ground as possible, because heating is difficult to control at a high place
and welded part of a branch pipe is prone to be melted to cause leakage.
For example:
Weld the pipe approx. 1m before and
behind the reflared position, and wrap
with thernal insulation mate
r
ials. Then,
weld on higher position.
A
pprox. 1m
A
pprox. 1m

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