Air Source Heat Pump Water Heater
15
or the bell mouth, or too loose to cause leakage. Table 7-1 shows the tightening
torque.
Table 7-1 Recommended tightening torque
Hex nut
Φ 6
Φ 9.52
Tightening torque (N•m)
15-20
31-35
7.2 Exhaust Methods
Table 7-2 Exhaust methods
Length of Connection Pipe
Air Exhaust Method
Refrigerant Charge
Volume
Not greater than 10 m
Use a refrigerant in the
outdoor unit
/
10 to 20 m
Use a vacuum pump
+20g/m
Note: The unit capability and energy efficiency decreases when length of the
connecting pipe increases. Therefore, take thermal insulation measures on the
connecting pipe when it needs to be extended.
(1)
Use a refrigerant in the outdoor unit:
①
Remove the valve cap and the fluoride injection mouth nut from the
fluid valve and the air valve.
②
Use a hex key to slightly unscrew the valve plug of the fluid valve,
and use a screwdriver to jack up the valve core of the air valve. Then, the air is
discharging.
③
Discharge the air for about 15 seconds. When there is refrigerant
gas discharged, close the valve core and tighten the fluoride injection mouth
nut.
④
Fully open the valve cores of the fluid valve, and the air valve, as
shown in Figure 7-3.
⑤
Tighten the valve cap, and then use a leak detector or soapy water
to check whether the pipes for connecting the outdoor unit and the water tank
leak.
