2WAY VRF SYSTEM
Test Run
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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
Balance tube
Liquid tube
(7) 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.
(8) Be sure to give the instruction manual and warranty
certificate to the customer.
(9) 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 EEPROM is not changed, and is connected to
the new control PCB.
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2. Test Run Procedure
41
Recheck before the test run.
Set outdoor unit address.
System address setting
Is it OK to start the compressor?
Turn ON power to indoor and outdoor units.
Set the remote controller to a test run.
Return remote controller
to normal mode.
Follow the section “8. 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.)
Cooling of indoor and outdoor units started.
LEDs 1 and 2 blink alternately.
Heating of indoor and outdoor units started.
LEDs 1 and 2 blink alternately.
While COOL side of MODE pin (CN40) on
outdoor main unit P.C.B short circuited, short
circuit the A.ADD pin (CN30) on outdoor main
unit P.C.B for over 1 second long.
Short circuit the A.ADD pin (CN30) on outdoor
main unit P.C. board for over 1 second long and
then open circuit.
Is it OK to start the compressor?
Make necessary
corrections.
Check alarm
contents.
Make necessary
corrections.
Turn OFF power to
indoor and outdoor units.
Check alarm contents.
Turn OFF power
to indoor and
outdoor units.
Short circuit the A.ADD pin (CN30)
on outdoor main unit P.C.B 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)
Turn ON power to indoor and outdoor units.
Set No. of outdoor units.
Set No. of indoor units.
CASE 1
CASE 2
CASE 3.a
CASE 3.b
Have outdoor sub units been connected?
Are LEDs 1 and 2 on
outdoor unit P.C.B OFF?
Are LEDs 1 and 2 on
outdoor unit P.C.B OFF?
Does system operate?
If the terminating resistance pin on outdoor main
unit P.C.B 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?
Is auto address setting
performed in heating mode?
NO
NO
YES
YES
YES
YES
End test run.
NO
NO
YES
NO
*2
*3
*4
*4
*2
*3
*1 The unit set to 1
becomes the outdoor
main unit.
Note:
It is not necessary to control the terminating
resistance pin excepting the outdoor main
unit.
<All outdoor unit control P.C.B>
Unit number setting switch
(SW5)
<Outdoor main unit control P.C.B>
Number of outdoor units setting
switch (SW6)
<Outdoor main unit control P.C.B>
Number of indoor units setting
switch (SW3 and SW4)
<Outdoor main unit control P.C.B>
System address setting switch
(SW1 and SW2)
See the section “6. Setting
Test Run Remote Controller.”
*1
YES
YES
NO
NO
(Check link wiring.)
*2 At least 5 hours must have passed after the power ON to the outdoor unit.
*3 All indoor units operate in all refrigerant systems where the power is ON.
*4 See the section “8. Self-Diagnosis Function Table and Contents of Alarm
Display”.
Notes:
1. Use caution when making the settings.
If there are duplicated system addresses, or if
the settings for the number of indoor units are not
consistent, an alarm will occur and the system will
not start.
2. These settings are not made on the indoor unit P.C.
board.
7-2. Test Run Procedure
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