Preparing For Test Run - Panasonic U-72MF1U9 Technical Data Manual

1. Preparing for Test Run

1. Preparing for Test Run

Before attempting to start the air conditioner, check the fol-
lowing.
(1) The control wiring is correctly connected and all electrical
connections are tight.
(2) The transportation pads for the indoor fan have been
removed. If not, remove them now.
(3) The power has been connected to the unit for at least 5
hours before starting the compressor. The bottom of the
compressor should be warm to the touch and the crank-
case heater around the feet of the compressor should be
hot to the touch.
(Fig. 5-1)
(4) If only 1 outdoor unit is installed, close the service valve
on the balance tubes, and open the service valve on the
other 3 tubes (suction, discharge, and liquid tubes). (Fig.
5-2)
If 2 or 3 outdoor units are installed, open the service
valves on all 4 tubes (suction, discharge, liquid, and bal-
ance tubes). (Fig. 5-2)
1
(5) Request that the customer be present for the trial run.
Explain the contents of the instruction manual, then have
the customer actually operate the system.
(6) Be sure to give the instruction manual and warranty cer-
tifi cate to the customer.
2
(7) When replacing the control PCB, be sure to make all the
same settings on the new PCB as were in use before
replacement.
The existing EEP ROM is not changed, and is connected
to the new control PCB.
3
4
5
6
7
8
Power mains switch
Balance tube
Liquid tube
Discharge tube
5 - 2
Test Run
ON
(Power must be turned ON
at least 5 hours before
attempting test run)
Fig. 5-1
Suction tube
Fig. 5-2