Mini VRF SYSTEM
Test Run
7 - 3
7
2. Test Run Procedure
1. Preparing for Test Run
●
Before attempting to start the air conditioner, check the
following.
(1) All loose matter is removed from the cabinet especially
steel filings, bits of wire, and clips.
(2) The control wiring is correctly connected and all electrical
connections are tight.
(3) The protective spacers for the compressor used for
transportation have been removed. If not, remove them
now.
(4) The transportation pads for the indoor fan have been
removed. If not, remove them now.
(5) 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
crankcase heater around the feet of the compressor should
be hot to the touch.
ON
(Power must be turned
ON at least 5 hours
before attempting test
run)
Power mains switch
(6) Both the gas and liquid tube service valves are open. If
not, open them now.
Gas tube
Liquid tube
(7) Request that the customer be present for the trial run.
Explain the contents of the operating instructions, then
have the customer actually operate the system.
(8) Be sure to give the operating instructions and installation
instructions to the customer.
(9) When replacing the control P.C. board, be sure to make all
the same settings on the new P.C. board as were in use
before replacement.
The existing EEPROM is not changed, and is connected to
the new control P.C. board.
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*
Recheck before the test run.
System address setting
Set the remote controller to a test run.
Return remote controller
to normal mode.
Follow the section “7. Self-Diagnosis Function Table and
Contents of Alarm Display” and resolve the problem.
Test run preparation is completed.
(Do not allow short-circuited pin to remain short-circuited.)
Make necessary
corrections.
Make necessary
corrections.
Check alarm
contents.
Check alarm
contents.
Turn OFF power
to indoor and
outdoor units.
Turn OFF power
to indoor and
outdoor units.
Short circuit the A.ADD pin on outdoor
main unit P.C. board for over 1 second
long and then open circuit.
Short circuit the A.ADD pin on outdoor
main unit P.C. board for over 1 second
long and then open circuit.
Turn ON power to indoor and outdoor
units only for that refrigerant system.
LEDs 1 and 2 blink alternately.
(Approx. 2 - 3 minutes)
Disconnect link wires for
multiple refrigerant system.
LEDs 1 and 2 blink alternately.
(Approx. 2 - 3 minutes)
Set the number of indoor units.
CASE 1
CASE 2
Are LEDs 1 and 2 on outdoor
unit P.C. board OFF?
Connect link wires to original place.
Are LEDs 1 and 2 on outdoor
unit P.C. board OFF?
Does system operate?
If the terminating resistance pin on outdoor main unit P.C.
board is made link wiring more than 2 refrigerant systems,
set to OPEN side excepting the nearest outdoor unit and
the farthest outdoor unit from the central controller.
Are indoor and outdoor control wires
connected to a multiple refrigerant system?
Is it possible to turn ON power only
for 1 refrigerant system where the
test run will be performed?
NO
YES
YES
YES
End test run.
NO
NO
YES
NO
*
<Outdoor main unit control P.C. board>
Number of indoor units
setting switch
(SW3 and SW4)
<Outdoor main unit control P.C. board>
System address setting switch
(SW1 and SW2)
See the section “5.
Setting Test Run Remote
Controller”.
YES
NO
(Check link wiring.)
*
See the section “7. Self-Diagnosis Function Table and
Contents of Alarm Display”.
Note:
These settings are not made on the indoor unit P.C. board.
2. Test Run Procedure
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