20
8.10 Addition refrigerant charge
1.After vacuuming work, exchange the vacuum pump with the refrigerant bomb and then start the additional
charging work of refrigerant.
2.Calculating the amount of additional refrigerant required.
3.When the system is charged with refrigerant at the factory, the amount of refrigerant needed for the pipes on
site is not included. Calculate the additional amount required, and add that amount to the system. Please refer
to '8.7 Additional refrigerant charge calculation'.
Charging of refrigerant:
●Keeping valve of the outdoor unit closed is sure to charge the liquid refrigerant into service port at liquid side.
●If the specified amount of refrigerant cannot be charged, open fully valves of outdoor unit at liquid and
discharge/suction gas sides, operate the air conditioner in COOL mode under condition that valve at suction
gas side is a little returned to close side, and then charge refrigerant into service port at suction gas side. In
this time, choke the refrigerant slightly by operating valve of the bomb to charge liquid refrigerant. The liquid
refrigerant may be charged suddenly, therefore be sure to charge refrigerant gradually.
●When refrigerant leaks and refrigerant shortage occurs in the system, recover the refrigerant in the system and
recharge refrigerant newly up to the correct level.
8 refrIGerANT pIpING
8.11 Installation of drain pipe
● Drain line must be inclined downward (minimum 1/100).
● Drain line must be PVC pipes with 25 of extra diameter.
● Drain hose can be matched to spot constriction to cut with knife.
● Please do not put drain pipe directly to the sewer that may produce sulfur gas of a location that may
produce bad smell.
● Please make sure no water leakage at interconnecting area of drain pipes.
● When drain pipe has to cross indoor, thermal insulation material (foam polyethylene with gravity of
0.03kg/m
3
and minimum 9mm of thickness) from the market must be applied to wrap the pipe and stick
adhesive tape on the surface to prevent invasion of air and condensation.
● If outdoor unit would work under cold, please insulate the drainage pipe.
CAUTION
