Carrier 38GJ Series Owner Manual And Install Manual page 23

NO. 1
Outdoor
Name
unit
NO. 6
Name Hi-knob
1) When the liquid and gas stop valves have not been opened, the system is under the vacuum:
ａ． Refer to the left side of the previous figure and connect the R410A tank to the system.
ｂ． Turn on the R410A tank and the Hi-knob and charge the R410A refrigerant into the unit from the
liquid side stop valve. The Lo-knob should be closed completely.
ｃ． Turn off the R410A tank and the Hi-knob immediately after adding enough additional refrigerant.
ｄ． Turn on the liquid and gas side stop valves in a counter-clockwise direction slowly and completely.
If the pressure of the system is too high to charge the refrigerant, you can perform the following steps.
2)
ａ． Turn on the liquid and gas side stop valves in an counter-clockwise direction slowly and completely.
ｂ． Turn on the air conditioner power, and set the cooling mode. Run the unit more than 0.5h when
the outside temperature is higher than
i) Refer to the left side of the previous figure and connect the R410A tank to the system.
ii) Turn on the R410A tank and the Lo-knob; charge the R410A refrigerant into the unit from
the gas side stop valve. The Hi-knob should be closed completely.
iii) Turn off the R410A tank and the Lo-knob immediately after adding enough additional refrigerant.
ｃ． Turn on the air conditioner power, and set the heating mode. Run the unit more than 0.5h when the
outside temperature is lower than
i) Refer to the right side of the previous figure and connect the R410A tank to the system.
ii) Turn on the R410A tank and the Hi-knob; charge the R410A refrigerant into the unit from
the service port. The Lo-knob should be closed completely.
iii) Turn off the R410A tank and the Hi-knob immediately after adding enough additional refrigerant.
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Caution
Ensure
the liquid and gas side stop valves are opened completely after the installation.
Ensure the length of liquid pipe is exact.
Additional refrigerant charge must be measured exactly.
Ensure the refrigerant is in liquid state.
Prevent refrigerant from spilling on your body when removing the charging hose.
Heat the refrigerant tank with hot water or hot air when the outside temperature is too
low. Never use fire as a heating source; it may lead to an explosion.
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2
Liquid side stop
Service port
valve
7
Lo-knob
Fig. 19
59°F (15°C)
DB.
59°F (15°C)
18
3 4
Gas side stop
valve
8
R410A tank
DB.
5
Pressure-vacuum
gauge
9
Scale