Daikin REMQ8P9Y1B, Installation Manual

R REMQ10~16P8 + REMHQ12P8Y1B

VRVIII System air conditioner

4PW48463-1A

Installation manual

12

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Vacuum drying: Use a vacuum pump which can evacuate to 
–100.7 kPa (5 Torr, –755 mm Hg)

1.

Evacuate the system from the liquid pipe, the suction gas pipe,
the high pressure/low pressure gas pipe and the equalizer pipe
stop valve service ports by using a vacuum pump for more than
2 hours and bring the system to –100.7 kPa. After keeping the
system under that condition for more than 1 hour, check if the
vacuum gauge rises or not. If it rises, the system may either
contain moisture inside or have leaks.

2.

Following should be executed if there is a possibility of moisture
remaining inside the pipe (if piping work is carried out during the
raining season or over a long period of time, rainwater may enter
the pipe during work).
After evacuating the system for 2 hours, pressurize the system to
0.05 MPa (vacuum break) with nitrogen gas and evacuate the
system again using the vacuum pump for 1 hour to –100.7 kPa
(vacuum drying). If the system cannot be evacuated to

–100.7 kPa

within 2 hours, repeat the operation of vacuum break and vacuum
drying.
Then, after leaving the system in vacuum for 1 hour, confirm that
the vacuum gauge does not rise.

8.

F

IELD

WIRING

8.1.

Internal wiring – Parts table

Refer to the wiring diagram sticker on the unit. The abbreviations
used are listed below:

A1P~A8P ............ Printed circuit board (main, noise filter, inverter,

fan, sub, current sensor, current sensor, fan)

BS1~BS5 ............ Push button switch (mode, set, return, test, reset)

C1,C63,C66 ........ Capacitor

E1HC~E3HC....... Crankcase heater

F1U ..................... Fuse (DC 650 V, 8 A, B) (A4P, A8P)

F1U ..................... Fuse (T, 3.15 A, 250 V) (A5P)

F1U,F2U ............. Fuse (T, 3.15 A, 250 V) (A1P)

F5U ..................... Field fuse (field supply)

F400U ................. Fuse (T, 6.3 A, 250 V) (A2P)

H1P~H8P ............ Pilot lamp

H2P: Under preparation or in test operation when

blinking

H2P: Malfunction detection when light up

HAP..................... Pilot lamp (service monitor - green) (A1P, A5P)

K1,K3 .................. Magnetic relay

K1R ..................... Magnetic relay (K2M–A1P, Y5S–A5P)

K2,K4 .................. Magnetic contactor (M1C)

K2M..................... Magnetic contactor for M2C 

(only for REMQ10~16 + REMHQ12)

K2R ..................... Magnetic relay (K3M–A1P, Y6S–A5P)

K3M..................... Magnetic contactor for M3C 

(only for 16 + REMHQ12)

K3R~K5R ............ Magnetic relay (Y1S~Y3S–A1P)

K5R ..................... Magnetic relay (for option–A5P)

K6R ..................... Magnetic relay (Y7S–A5P)

K7R~K9R ............ Magnetic relay (E1HC~E3HC–A1P)

K11R ................... Magnetic relay (Y4S–A1P)

L1R ..................... Reactor

M1C~M3C........... Motor (compressor)

M1F,M2F ............. Motor (fan)

PS ....................... Switching power supply (A1P,A3P)

Q1DI.................... Earth leakage breaker (field supply)

Q1RP .................. Phase reversal detection circuit

R1T ..................... Thermistor (air–A1P, fin–A3P)

R3T~R9T ............ Thermistor (H/E gas, H/E-de-icer, sub cool H/E

gas, sub cool H/E liquid, H/E liquid, suction, liquid)

R10 ..................... Resistor (current sensor) (A4P, A8P)

R31T~R33T ........ Thermistor (discharge) (M1C~M3C)

R50,R59.............. Resistor

R90 ..................... Resistor (current sensor)

R95 ..................... Resistor (current limiting)

S1NPH ................ Pressure sensor (high)

S1NPL................. Pressure sensor (low)

S1PH~S3PH ....... Pressure switch (high)

SD1 ..................... Safety devices input

T1A ..................... Current sensor (A6P, A7P)

V1R ..................... Diode bridge (A3P)

V1R ..................... Power module (A4P, A8P)

V2R ..................... Power module (A3P)

X1A,X4A ............. Connector (M1F, M2F)

X1M..................... Terminal strip (power supply)

X1M..................... Terminal strip (control) (A1P)

Y1E~Y3E ............ Electronic expansion valve (main, charge,

subcool)

All field wiring and components must be installed by a
licensed electrician and must comply with relevant local
and national regulations.

The field wiring must be carried out in accordance with the
wiring diagrams and the instructions given below.

Be sure to use a dedicated power circuit. Never use a
power supply shared by another appliance. This can lead
to electric shock or fire.

Be sure to install an earth leakage circuit breaker.
(Because this unit uses an inverter, install an earth
leakage circuit breaker that is capable of handling high
harmonics in order to prevent malfunctioning of the earth
leakage breaker itself.)

Do not operate until refrigerant piping work is completed.
(If operated before completion of the piping work, the
compressor may break down.)

Never remove a thermistor, sensor, etc., when connecting
power wiring and transmission wiring.
(If operated without thermistor, sensor, etc., the
compressor may break down.)

The reversed phase protection detector of this product only
functions when the product starts up. Consequently,
reversed phase detection is not performed during normal
operation of the product.

The reversed phase protection detector is designed to stop
the product in the event of an abnormality when the
product is started up.

Replace two of the three phases (L1, L2, and L3) during
reverse-phase protection circuit operation.

If the possibility of reversed phase exists after a
momentary blackout and the power goes on and off while
the product is operating, attach a reversed phase
protection circuit locally. Running the product in reversed
phase can break the compressor and other parts.

Means for disconnection must be incorporated in the field
wiring in accordance with the wiring rules.
(An all-pole disconnection switch must be available on the
unit.)