Lennox Relax series Installation Manual page 15

When Using the Vacuum Pump
(For method of using a manifold valve, refer to its operation manual.)
1. Completely tighten the flare nuts, A, B, C, D, connect the manifold valve charge hose to
a charge port of the low-pressure valve on the gas pipe side.
2. Connect the charge hose connection to the vacuum pump.
3. Fully open the handle Lo of the manifold valve.
4. Operate the vacuum pump to evacuate. After starting evacuation, slightly loose the flare
nut of the Lo valve on the gas pipe side and check that the air is entering
(Operation noise of the vacuum pump changes and a compound meter indicates 0
instead of minus)
5. After the evacuation is complete, fully close the handle Lo of the manifold valve and stop
the operation of the vacuum pump.
Make evacuation for 15 minutes or more and
check that the compound meter indicates
-76cmHg (-1x105Pa).
6. Turn the stem of the packed valve B about 45º
counterclockwise for 6~7 seconds after the gas
coming out, then tighten the flare nut again.
Make sure the pressure display in the pressure
indicator is a little higher than the atmosphere
pressure.
7. Remove the charge hose from the Low pressure
charge hose.
8. Fully open the packed valve stems B and A.
9. Securely tighten the cap of the packed valve.
After the confirmation of the above conditions, prepare the wiring as follows:
1) Never fail to have an individual power circuit specifically for the air conditioner. As for
the method of wiring, be guided by the circuit diagram posted on the inside of control
cover.
2) The screw which fasten the wiring in the casing of electrical fittings are liable to come
loose from vibrations to which the unit is subjected during the course of
transportation. Check them and make sure that they are all tightly fastened. (If they
are loose, it could cause burn-out of the wires.)
3) Specification of power source.
4) Confirm that electrical capacity is sufficient.
5) See to that the starting voltage is maintained at more than 90 percent of the rated
voltage marked on the name plate.
6) Confirm that the cable thickness is as specified in the power source specification.
7) Always install an earth leakage circuit breaker in a wet or moist area.
8) The following would be caused by voltage drop.
Vibration of a magnetic switch, which will damage the contact point, fuse breaking,
disturbance of the normal function of the overload.
9) The means for disconnection from a power supply shall be incorporated in the fixed
wiring and have an air gap contact separation of at least 3mm in each active (phase)
conductors.
12 Air purging
CAUTION