Panasonic GHP Test Run Manual page 5

(3) Safety check
 Insulation resistance check
Perform the following procedure to check the insulation up until the unit power terminal block.
 Turn off the main power supply of the indoor and outdoor units.
 Turn off the power switch in the terminal box of the outdoor unit.
 Connect the insulation tester between each of the power terminals of the R phase, O phase, and S phase and the
ground terminal on the power terminal block (TB1) in the terminal box, and take measurements. (Figure 1)
If a resistance check is required on the outdoor unit side, turn on the power switch in the terminal box, and take
measurements.
* Measurement criterion: 1 M Ω or more
(2) Fuel tube connector leak check
 Open the liquid tube cock.
 Use a gas leak detector (Figure 2), soap solution, or the like to check that there is no leak from the fuel tube con-
nector of the outdoor unit.
(4) Indoor/outdoor control wire connection confirmation
Check the indoor/outdoor control wire connection regardless of whether there is a warning or not. Before performing the
check, turn off the power of all devices (including controllers) that are connected to the indoor/outdoor control wire.
1. Ground fault check
2. Short circuit check
3. Wire break or dis-
connection check
4. Shield wire check
5. Others
* Terminal resistor is basically "ON (SHORT) for one unit only, but depending on the installation status can be set to
"ON (SHORT)" for up to 3 units.
Figure 1
Measure the resistance between one end of the indoor/outdoor control wire and
the point of ground screw, as well as the resistance between the other operating
1-1
line end and the point of ground screw. Are both measured resistance values in
MΩ unit (infinite)?
1-2 Because the indoor/outdoor control wiring has a ground fault, search for the location of the
ground fault.
Measure the resistance between the indoor/outdoor control wires on the terminal
board of the outdoor unit.
2-1 The measured resistance value is around 75 to 100Ω?
When setting multiple "ON (SHORT)" to switches with terminal resistor, the
resistance value mentioned above is 1 over number of units. *1
If the wiring has a short circuit, search for the location of the short circuit on the indoor/
outdoor control wire.
2-2
If it is open, check the terminal resistor of outdoor board, and check the wiring from out-
door board to outdoor terminal board.
Measure the resistance between the indoor/outdoor control wires on the boards
3-1 of all devices that are connected to the control wires.
Any location with measured resistance values in MΩ units (infinite)?
3-2 Because the wiring has a break, search for the location of the break.
4-1 A shield wire is used as an indoor/outdoor control wire?
4-2 Only one end of the shield wire is grounded?
4-3 Ground only one end of the shield wire.
5-1 Check total wire length and the number of branch connections and connected units.
Figure 2
Ⅰ－2
Yes 2-1
No 1-2
Yes 3-1
No 2-2
Yes 3-2
No 4-1
Yes 4-2
No 5-1
Yes 5-1
No 4-3