DC INVERTER MULTI VRF INSTALLATION
149
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.
3
）Attention
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:
i. To avoid the position difficult to weld, you may add a prefabricated assembly below.
Difficult to weld at
this position
Drainage pipe
Weld the pipe approx. 1m before and
behind the reflared position, and wrap
with thernal insulation materials. Then,
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