Klimaire KMIR218-H221 User manual

Multi outdoor units
SERVICE MANUAL
Multi - Zone
heat pump units
Model Numbers:
KMIR218-H221 / KMIR327-H217 / KMIR436-H217 / KMIR545-H219
WARNING
Installation MUST conform with local building codes or, in the absence of local
codes, with the National Electrical Code NFPA70/ANSI C1-1993 or current edition
and Canadian Electrical Code Part1 CSA C.22.1.
The information contained in the manual is intended for use by a qualified service
technician familiar with safety procedures and equipped with the proper tools and
test instruments
Installation or repairs made by unqualified persons can result in hazards to you
and others.
Failure to carefully read and follow all instructions in this manual can result in
equipment malfunction, property damage, personal injury and/or death.
Table of Contents
1. Indoor Unit Combination
2. Suggested Indoor Unit Model Numbers
3. Dimension Of Outdoor Unit
4. Refrigerant Cycle Diagram
5. Installation Details
6. Electronic Function
7. Wiring Diagrams
8. Trouble Shooting
9. Disassembly Instructions
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CONTENTS
1. Indoor Unit Combination.......................................................................................................................................... 4
2. Suggested Indoor Unit Model Numbers...................................................................................................................5
3. Dimension Of Outdoor Unit...................................................................................................................................... 6
4. Refrigerant Cycle Diagram........................................................................................................................................ 7
5. Installation Details.................................................................................................................................................... 9
5.1 Wrench torque sheet for installation ................................................................................................................. 9
5.2 Connecting the cables ........................................................................................................................................ 9
5.3 Pipe length and the elevation............................................................................................................................. 9
5.4 Installation for the first time .............................................................................................................................. 9
5.5 Adding the refrigerant after running the system for many years ....................................................................11
5.6 Procedure when servicing the indoor unit refrigeration circuit.......................................................................12
5.7 Evacuation after servicing the outdoor unit refrigeration circuit ....................................................................13
6. Electronic Function................................................................................................................................................. 14
6.1 Abbreviation .....................................................................................................................................................14
6.2 Electric control working environment.............................................................................................................. 14
6.3 Main Protection................................................................................................................................................ 14
6.4 Control and Functions ......................................................................................................................................16
7. Wiring Diagrams .....................................................................................................................................................21
8. Troubleshooting .....................................................................................................................................................24
8.1Safety................................................................................................................................................................. 24
8.2Indoor Unit Error Display...................................................................................................................................25
8.3 Outdoor Unit Display ........................................................................................................................................26
8.4 Diagnosis and Solution .....................................................................................................................................31
8.5 Trouble Criterion Of Main Parts. ...................................................................................................................... 80
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1. Indoor Unit Combination
Multi-Zone
Outdoor Unit
Nominal
capacity
Suggested
Combination
Limit
KSIM218-H221
1drives2
18k Btu
12
None
9+9
9+12
12+12
Multi DC
Outdoor Unit
Nominal
capacity
Suggested
Combination
Limit
KSIM545-H219
1 drives5 48k Btu
18+18
None
18+24
24+24
9+9+18
9+9+24
9+12+12
9+12+18
9+12+24
9+18+18
9+18+24
9+24+24
12+12+12
12+12+18
12+12+24
12+18+18
12+18+24
12+24+24
18+18+18
Multi-Zone
Outdoor Unit
Nominal
capacity
Suggested
Combination
Limit
9+9
9+12
9+18
12+12
12+18
18+18
9+9+9
9+9+12
9+9+18
9+12+12
9+12+18
12+12+12
Multi DC
Outdoor Unit
Nominal
capacity
Suggested
Combination
Limit
KSIM436-H217
1 drives4
36k Btu
9+18
None
12+12
12+18
18+18
9+9+9
9+9+12
9+9+18
9+12+12
9+12+18
9+18+18
12+12+12
12+12+18
12+18+18
9+9+9+9
9+9+9+12
9+9+9+18
9+9+12+12
9+9+12+18
9+12+12+12
12+12+12+12
KSIM327-H217
1drives3
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18+18+24
9+9+9+9
9+9+9+12
9+9+9+18
9+9+9+24
9+9+12+12
9+9+12+18
9+9+12+24
9+9+18+18
9+9+18+24
9+12+12+12
9+12+12+18
9+12+12+24
9+12+18+18
9+18+18+18
12+12+12+12
12+12+12+18
12+12+12+24
12+12+18+18
9+9+9+9+9
9+9+9+9+12
9+9+9+9+18
9+9+9+9+24
9+9+9+12+12
9+9+9+12+18
9+9+9+18+18
9+9+12+12+12
9+9+12+12+18
9+12+12+12+12
9+12+12+12+18
12+12+12+12+12
KSIM545-H219
1 drives5 48k Btu
KSIM545-H219
1 drives5 48k Btu
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2. Dimension Of Outdoor Unit
Model
Unit：
W
D
H
W1
A
B
KSIM218-H221
mm
845
363
702
923
540
350
inch
33.3
14.3
27.6
36.0
21.3
13.8
KSIM327-H217
mm
946
410
810
1034
673
403
inch
37.2
16.5
31.9
40.6
26.5
15.9
KSIM436-H217
mm
946
410
810
1034
673
403
inch
37.2
16.5
31.9
40.6
26.5
15.9
KSIM545-H219
mm
952
415
1333
1045
634
404
inch
37.5
16.3
52.5
41.1
25.0
15.9
A
B
D
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3. Refrigerant Cycle Diagram
4.1 Refrigeration circuit drawing of inverter 1 drives2 type
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXV B CAPILIARY B
LIQUID VALVE B
GAS VALVE B
Accumulator
T2B-A Evaporator
temp. sensor outlet
T2B-B
4.2 Refrigeration circuit drawing of inverter 1 drives3 type
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXV B CAPILIARY B
LIQUID VALVE B
GAS VALVE B
EXV C CAPILIARY C
LIQUID VALVE C
GAS VALVE C
Accumulator
T2B-A Evaporator
temp. sensor outlet
T2B-B
T2B-C
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4.3 Refrigeration circuit drawing of inverter 1 drives4 type
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXV B CAPILIARY B
LIQUID VALVE B
GAS VALVE B
EXV C CAPILIARY C
LIQUID VALVE C
GAS VALVE C
EXV D CAPILIARY D
LIQUID VALVE D
GAS VALVE D
Accumulator
High pressure
switch
Low pressure
switch
T2B-A Evaporator
temp. sensor outlet
T2B-B
T2B-C
T2B-D
4.4 Refrigeration circuit drawing of inverter 1 drives5 type
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR) HEAT
EXCHANGE
(CONDENSER)
COOLING
HEATING
T2 Evaporator
temp. sensor
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILIARY A
CHECK VALVE
CAPILIARY TUBE
EXV B CAPILIARY B
LIQUID VALVE B
GAS VALVE B
EXV C CAPILIARY C
LIQUID VALVE C
GAS VALVE C
EXV D CAPILIARY D
LIQUID VALVE D
GAS VALVE D
EXV E CAPILIARY E
LIQUID VALVE E
GAS VALVE E
Compressor
4-WAY VALVE
T5 Discharge
temp. sensor
Accumulator High pressure
switch
Low pressure
switch
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4. Installation Details
5.1 Wrench torque sheet for installation
Outside diameter
Torque
Additional tightening torque
mm
inch
N.cm
N.cm
Ф6.35
1/4
1500(153kgf.cm)
1600(163kgf.cm)
Ф9.52
3/8
2500(255kgf.cm)
2600(265kgf.cm)
Ф12.7
1/2
3500(357kgf.cm)
3600(367kgf.cm)
5.2 Connecting the cables
The power cord connection should be
selected according to the following
specifications sheet.
Unit
AWG
1 drive 2 type (18K outdoor unit)
14
1 drive 3 type (27K outdoor unit).
14
1 drive 4 type (36K outdoor unit)
12
1 drive 5 type (48K outdoor unit)
10
For indoor unit and outdoor unit connection
line, 16AWG is ok for all.
5.3 Pipe length and the elevation
Maximum piping length and height difference
1 drive 2
1 drive 3
1 drive 4
1 drive 5
Max. length for all
rooms (m)
30 (98ft)
45
(150ft)
60
(200ft)
75
(246ft)
Max. length for
one IU (m)
20
(65.6ft)
25 (82ft)
30 (98ft)
30 (98ft)
Max.
height
difference
between
IU and
OU (m)
OU
higher
than
IU
10 (33ft)
10 (33ft)
10 (33ft)
10 (33ft)
OU
lower
than
IU
15
(49.2ft)
15
(49.2ft)
15
(49.2ft)
15
(49.2ft)
Max. height
difference between
IUs (m)
10 (33ft)
10 (33ft)
10 (33ft)
10 (33ft)
Additional refrigerant charge
1 drive 2
1 drive 3
1 drive 4
1 drive 5
Chargeless pipe
length (m)
15
(49.2ft)
22.5
(73.8ft)
30
(98.4ft)
37.5
(123ft)
Additiona
l
refrigeran
t charge
g
15 x
(length
for all
rooms -
15)
15 x
(length
for all
rooms –
22.5)
15 x
(length
for all
rooms -
30)
15 x
(length
for all
rooms –
37.5)
oz
0.161
x(length
for all
rooms –
49.2)
(0.161
x(length
for all
rooms –
73.8)
0.161x(le
ngth for
all rooms
–98.4)
.0.161x(le
ngth for
all rooms
–123)
Caution:
●Refrigerant pipe diameter is different
according to indoor unit to be connected.
When using the extension pipe, refer to the
tables below.
●When refrigerant pipe diameter is different
from that of the outdoor unit connector (18K
indoor unit) an additional adapter is required.
Indoor unit
Extension pipe diameter
(mm/inch)
Model
Pipe diameter
(mm/inch)
9K
Liquid
6.35(1/4)
Liquid
6.35(1/4)
Gas
9.52(3/8)
Gas
9.52(3/8)
12K 18K
Liquid
6.35(1/4)
Liquid
6.35(1/4)
Gas
12.7(1/2)
Gas
12.7(1/2)
24K
Liquid
9.52 (3/8)
Liquid
9.52 (3/8)
Gas
15.9(5/8)
Gas
15.9(5/8)
Outdoor unit union diameter (mm/inch)
1 drive 2
Liquid
6.35(1/4) *2
Gas
9.52(3/8) *2
1 drive 3
Liquid
6.35(1/4) *3
Gas
9.52(3/8) *3
1 drive 4
Liquid
6.35(1/4) *4
Gas
9.52(3/8) *4
1 drive 5
Liquid
6.35(1/4) *5
Gas
9.52(3/8) *3
12.7(1/2)*2
5.4 Installation for the first time
Air and moisture in the refrigerant system have
undesirable effects as below:
●Pressure in the system rises.
●Operating current rises.
●Cooling or heating efficiency drops.
●Moisture in the refrigerant circuit may freeze
and block capillary tubing.
●Water when mixed with the refrigerant and oil
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will create an acid that will damage the motor
windings and components.
Therefore, the indoor units and the pipes between
indoor and outdoor units must be leak tested and
evacuated to remove gas and moisture from the
system.
Gas leak check (Soap water method):
Apply soap water or a liquid neutral detergent on
the indoor unit connections or outdoor unit
connections with a soft brush to check for
leakage of the connecting points of the piping. If
bubbles come out, the pipes have leakage.
1. Air purging with vacuum pump
1. Completely tighten the flare nuts of the indoor
and outdoor units, confirm that both the 2-way
and 3-way valves are set to the front seated.
2. Connect the low pressure gauge to the 3 way
service valve access port.
3. Connect the middle hose of the gauge
manifold (usually yellow) to the vacuum pump.
4. Fully open the handle for the low pressure
gauge.
5. Start the vacuum pump and operate
according to manufacture spec's.
6. Perform an evacuation for a minimum of 30
minutes and check that the low pressure
(compound) gauge indicates a vacuum of
29.9 in/hg (500 microns). A vacuum gauge
should be used if available. If the proper
vacuum cannot be achieved the vacuum
pump should be run for an additional 20
minutes. If after the additional 20 minutes the
vacuum still cannot be achieved there is a
leak in the system and must be located and
repaired. Follow the leak checking procedure
as mentioned before. If the vacuum is
achieved, close the low pressure gauge
handle off and shut the vacuum pump off.
Recheck the reading after 10 minutes, the
vacuum may change slightly, this is normal.
7. The system is now dry and free of
contaminates, refrigerant pressure should
now be added to the system from a source
other than the system before opening the 2
way and 3 way valves for system operation.
8. The 2 way and 3 way valve can now be
opened for the system operation.
2. Air purging by refrigerant
Procedure:
1) Confirm that both the 2-way and 3-way valves
are set to the closed position.
2) With a container of refrigerant and a gauge
manifold set, connect the low pressure gauge
hose to the 3 way valve service port.
3) Air purging.
Open the valve on the refrigerant container and
the low pressure gauge to allow the refrigerant to
enter the system, next loosen the flare connection
on the 2 way valve line to purge the air and
contaminants from the system for 30 to 50
seconds, then retighten the connection.
4) Check the gas leakage.
Next allow the pressure from the refrigerant to
reach 100 psi and then close the low pressure
gauge and the refrigerant container and check
the 2 way and 3 way valve line connections for
leaks with liquid soap or electronic leak detector.
5) Discharge the refrigerant.
After the system has been check for leaks the
pressure should be adjusted to about 25 to 50
psi.
6) You can now disconnect the gauge manifold
and refrigerant container from the system and
open the 2 way and 3 way valves for system
operation.
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7). Mount the valve stems nuts and the service
port cap.
Be sure to use a torque wrench to tighten the
service port cap to a torque 18N·m (13.27 ft·lbs).
Always leak check after servicing the refrigerant
system.
3. Adding refrigerant if the pipe length
exceeds chargeless pipe length
Procedure:
1) Connect the low pressure gauge from the
gauge manifold set to the 3 way service valve
(this is the blue hose on most sets).
2) Connect the middle hose from the manifold set
to the refrigerant container (this is the yellow line
on most sets). With refrigerant 410A the container
must be inverted (upside down) when adding the
refrigerant. Note that the 2 way and 3 way valves
must be in the open position.
3) The air in the gauge hoses needs to be purged
out. use the pressure from the system to purge
the low side line, loosen the connection on the
manifold for a second, next open the to valve on
the refrigerant container to pressurize the line,
now loosen that hose at the manifold for a second
and purge that line.
4) Set the refrigerant container on an electronic
charging scale and record the weight or zero the
scale depending on the scale used. Next
determine the refrigerant charge to be added.
5) Start the unit in the cooling mode and lower
the set point so the unit won’t shut off during the
charging procedure.
6) Refrigerant can now be added to the system,
open the low pressure valve on the gauge
manifold set to start charging the unit with liquid
refrigerant, keep track of the refrigerant being
added to the system (do not overcharge the
system).
7) Once the correct charge has been added to
the system close the low pressure valve on the
gauge manifold set and record the operating
pressure. The system is now charged and the
unit can be shut off. Close the valve on the
refrigerant container and disconnect the hose
from the manifold set, also disconnect the hose
from the 3 way valve and replace and torque all
caps.
Be sure to use a torque wrench to tighten the
service port cap to a torque 18N·m (13.27 ft·lbs).
Always leak check after servicing the refrigerant
system.
5.5 Adding the refrigerant after running
the system for many years
Procedure
1) Connect the low pressure gauge from the
gauge manifold set to the 3 way service valve
(this is the blue hose on most sets).
2) Connect the middle hose from the manifold set
to the refrigerant container (this is the yellow line
on most sets). With refrigerant 410A the container
must be inverted (upside down) when adding the
refrigerant. Note that the 2 way and 3 way valves
must be in the open position.
3) The air in the gauge hoses needs to be purged
out. use the pressure from the system to purge
the low side line, loosen the connection on the
manifold for a second, next open the to valve on
the refrigerant container to pressurize the line,
now loosen that hose at the manifold for a second
and purge that line.
4) Set the refrigerant container on an electronic
charging scale and record the weight or zero the
scale depending on the scale used. Next
determine the refrigerant charge to be added.
5) Start the unit in the cooling mode and lower
the set point so the unit won’t shut off during the
charging procedure.
6) Refrigerant can now be added to the system,
open the low pressure valve on the gauge
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manifold set to start charging the unit with liquid
refrigerant, keep track of the refrigerant being
added to the system (do not overcharge the
system).
7) Once the correct charge has been added to
the system close the low pressure valve on the
gauge manifold set and record the operating
pressure. The system is now charged and the
unit can be shut off. Close the valve on the
refrigerant container and disconnect the hose
from the manifold set, also disconnect the hose
from the 3 way valve and replace and torque all
caps.
Be sure to use a torque wrench to tighten the
service port cap to a torque 18N·m (13.27 ft·lbs).
Always leak check after servicing the refrigerant
system.
5.6 Procedure when servicing the indoor
unit refrigeration circuit.
1. Pumping down the system (isolating the
refrigerant charge in the condensing unit)
Procedure
1) With the unit in the cooling mode and a low set
point remove all caps from the 3 way and 2 way
valves, next attach the low pressure gauge to the
3 way service valve port and purge the air from
that hose by loosening the hose at the manifold
for a second, be sure the low pressure gauge
valve is closed. Be sure to record the operating
pressure, you will need to know this when you
complete the service on the indoor unit and
restart the system. Now prepare to close both
valves on the unit starting with the 2 way valve
(this is called front seating the valve) also prepare
to shut the power off to the outdoor unit.
2) Now close the 2 way valve and monitor the low
pressure gauge. The pressure will start to drop.
3) Operate the unit in the cooling mode and
disconnect the power to the outdoor unit when
the low side gauge reads a slight vacuum,
running the compressor in a vacuum could
damage the motor windings. Note that units with
extended lines and additional refrigerant charge
may not be able to achieve a vacuum. This is
because the outdoor unit can only store a certain
amount of refrigerant, this is normal (the
amperage of the compressor will have to be
monitored in this case). Stop compressor when
the amperage approaches the name plate FLA
rating.
4) Now close the 3 way valve right away. The
pressure will rise during this time, this is normal.
There will be some pressure left in the system.
This is normal. The indoor unit is now ready to be
serviced.
2. Sweeping (air purging) the system with
refrigerant after the service to the refrigerant
circuit of the indoor unit is complete.
Procedure:
1) Sweeping the system can be used when the unit
has been pumped down, this eliminates the need to
loosen the flare connection on the 2 way valve
(loosening and retightening flare connections could
cause a refrigerant leak)
2) Sweeping the system with refrigerant from a
pump down condition (refrigerant has been isolated
in the outdoor unit)
3) Open the 2 way valve all the way then the 3 way
valve all the way and check for leaks.
4) Start the unit in the cooling mode and check the
pressure (remember the pressure you recorded?)
The unit is going to be low on refrigerant from the
sweeping process, add refrigerant as needed from
the refrigerant container in the liquid state to
achieve the operating pressure that you recorded.
The process is now complete.
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5.7 Evacuation after servicing the outdoor
unit refrigeration circuit
1. Evacuation of the complete refrigeration
circuit, Indoor and outdoor unit.
Procedure:
1). Confirm that both the 2-way and 3-way valves
are set to the opened position.
2). Connect the vacuum pump to 3-way valve’s
service port.
3). Evacuation for approximately one hour.
Confirm that the compound meter indicates -
0.1Mpa (500 Microns / 29.9 in,hg).
4). Close the valve (Low side) on the charge set,
turn off the vacuum pump, and confirm that the
gauge needle does not move (approximately 5
minutes after turning off the vacuum pump).
5). Disconnect the charge hose from the vacuum
pump.
2. Refrigerant charging
Procedure:
1). Connect the charge hose to the charging
cylinder, open the 2-way valve and the 3-way
valve.
Connect the charge hose which you disconnected
from the vacuum pump to the valve at the bottom
of the cylinder. If the refrigerant is R410A, make
the cylinder bottom up to ensure liquid charge.
2). Purge the air from the charge hose
Open the valve at the bottom of the cylinder and press
the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
3) Put the charging cylinder onto the electronic
scale and record the weight.
4). Open the valves (Low side) on the charge set and
charge the system with liquid refrigerant
If the system cannot be charge with the specified
amount of refrigerant, or can be charged with a little
at a time (approximately 150g each time) , operating
the air conditioner in the cooling cycle; however,
one time is not sufficient, wait
approximately 1 minute and then repeat the
procedure.
5).When the electronic scale displays the proper
weight, disconnect the charge hose from the 3-way
valve’s service port immediately
If the system has been charged with
liquid refrigerant while operating the air conditioner, turn
off the air conditioner before disconnecting the
hose.
6). Mounted the valve stem caps and the service port.
Use torque wrench to tighten the service port cap
to a torque of 18N·m (13.27 ft·lbs). Always leak check
after servicing the refrigerant system.
For KMIR327-H217 / KMIR436-H217 / KMIR545-H219
There are one low-pressure centralized valve and one
high-pressure centralized valve, it will be more
time saving when vacuum and recycle
refrigerant. But refer to the previous instruction
when vacuum and recycle refrigerant.
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6. Electronic Function
6.1 Abbreviation
T1: Indoor ambient temperature
T2: Coil temperature of indoor heat exchanger
middle.
T2B: Coil temperature of indoor heat exchanger
outlet. (This sensor is located in the outdoor unit)
T3: Pipe temperature of outdoor heat exchanger
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
6.2 Electric control working environment.
6.2.1 Input voltage: 230V.
6.2.2 Input power frequency: 60Hz.
6.2.3 Indoor fan normal working amp. is less than
1A.
6.2.4 Outdoor fan. Normal working amp. is less
than 1.5A.
6.2.5 Four-way valve normal working amp. is less
than 1A.
6.3 Main Protection
VOLTAGE
No limit
VOLT_LTM_FREQ1_ADD
VOLT_LTM_FREQ2_ADD
6.3.1 Three Minutes Delay at restart for
compressor.
---- 1min delay for the 1st time start-up and 3
minutes delay for others.
6.3.2 Temperature protection of compressor
discharge.
When the compressor discharge temperature is
getting higher, the running frequency will be
limited as below rules:
----If 221 ºF(105 ºC)≦T5<230 ºF (110ºC), keep
the current frequency.
----If the temperature increase and T5≧230 ºF
(110 ºC), decrease the frequency to the lower
level every 2 minutes till to F1.
---If T5≧239 ºF (115ºC) for 10 seconds, the
compressor will stop and restart till T5<194ºF
(90ºC).
6.3.3 Fan Speed is out of control.
---- When outdoor fan speed is lower
than 100RPM or higher than 2400RPM for 60
second, the whole unit stops and LED displays
E8 failure.
6.3.4 Inverter module Protection.
----Inverter module protection itself has
a protection function against current, voltage
and temperature. If these protections
happened, the corresponding code will display
on indoor unit LED and A/C will stop. The unit
will recover 3min delay after the protection
6.3.5 Lodisappeared.
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Note: if the low voltage protection occurs and not
resumes within 3min, it will keep the protection
always after restart the machine.
6.3.6 Compressor current limit protection
Temperature interval.of current limit is same as
range of T4 limited frequency.
Cooling mode:
CoolReturnI
The difference between limit
current and quit current.
CoolT4Zone5I
Cooling T4≥122ºF limit current value
CoolT4Zone4I
Cooling 49＞T4≥113ºF (45ºC)
limit current value
CoolT4Zone3I
Cooling 44＞T4≥106ºF (41ºC)
limit current value
CoolT4Zone2I
Cooling 40﹥T4≥91ºF (33ºC)
limit current value
CoolT4Zone1I
Cooling 32＞T4ºC limit current value
CoolStopI
Cooling stop protection current value
Heating mode:
ºF
59
57 HeatT4Zone4I
50
48 HeatT4Zone3I
43
41 HeatT4Zone2I
HeatT4Zone1I
HeatReturnI
The difference between limit
current and quit current.
HeatT4Zone4I
Heating T4≥59ºF (15ºC) limit
current value
HeatT4Zone3I
Heating 14＞T4≥50ºF (10ºC)
limit current value
HeatT4Zone2I
Heating 9＞T4≥43 ºF (6ºC)
limit current value
HeatT4Zone1I
Heating 5＞T4 limit current value
HeatStopI
Heating stop protection current
value
6.3.7 Indoor / outdoor units communication
protection
If the indoor units cannot receive the feedback
signal from the outdoor units for 2 minutes, the
AC will stop and display the failure.
6.3.8 High condenser coil temp. protection.
6.3.9 Outdoor unit anti-freezing protection
When T2<39ºF (4ºC) for 250 seconds or
T2<32ºF (0ºC), the indoor unit capacity
demand will be zero and resume to normal
when T2>46ºF(8ºC) and the time of protection
is no less than 3 minutes.
T3
Resume
Off
Decrease
Hold
ºF
CoolT4Zone5I
122
120
113 CoolT4Zone4I
109
106
104 CoolT4Zone3I
91
90
CoolT4Zone2I
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6.3.10 Oil return
Running rules:
1. If the compressor frequency keeps lower than
setting frequency for setting time, the AC will rise
the frequency to setting frequency for setting
time and then resume to former frequency.
2. The EXV will keep 300p while the indoor units
will keep the current running mode.
If the outdoor ambient is higher than setting
frequency during the oil return, the AC quit oil
return.
6.3.11 Low outdoor ambient temperature
protection
When compressor is off, T4 is be lower than -
35℃.for 10s, the AC will stop and display “LP”.
When compressor is on, T4 is be lower than -
40℃.for 10s, the AC will stop and display “LP”.
When T4 is no lower than -32℃.for 10s, the unit
will exit protection.
6.4 Control and Functions
6.4.1 Capacity Request Calculation
Total capacity Request=Σ(Norm code × HP) /10 +
correction
Cooling mode:
T1 Ts
5.4
1.8
-1.8
e
c
a7.2
3.6
0
3.6
5.4
0
1.8
f
d
b
Capacity area
a
b
c
d
e
f
Norm code (N)
3
2
1.5
1
0.5
0
Model
9K
12K
18K
24K
HP
1.0
1.2
1.5
2.5
Note: The final result is integer.
According to the final capacity request to
confirm the operating frequency, as following
table.
Frequency (Hz)
0
COO
L_F1
COO
L_F2
…
…
COOL
_F24
COO
L_F2
5
Amendatory
capacity
demand.
0
1
2
…
…
24
25
Meanwhile the maximum running frequency will
be adjusted according to the outdoor ambient
temp.
109
106
100
T4LimFre1_ADD
No limit
T4LimFre2_ADD
T4LimFre3_ADD
108
102
99
120
115
T4LimFre4_ADD
T4LimFre5_ADD
118
113
Heating mode
T1 Ts
7.2
1.8
a
5.4
1.8
-1.8
5.4
1
3.6
0
b
c
d
e
f
3.6
Capacity area
a
b
c
d
e
f
Norm code (N)
3
2
1.5
1
0.5
0
Model
9K
12K
18K
24K
HP
1.0
1.2
1.5
2.5
Note: The final result is integer.
ºF
T4
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Then modify it according to T2 average
(correction):
Note:Average value of T2：Sum T2 value of all
indoor units)/ (indoor units number
ºF T2 average
Decrease frequency
117
Keep frequency
104 Increase frequency
According to the final capacity request to
confirm the operating frequency, as following
table.
Frequency (Hz)
0
HEAT
_F1
HEAT
_F2
…
HEAT
_F24
HEAT
_F25
Amendatory
capacity
demand.
0
1
2
…
24
25
6.4.2 Defrosting control
Condition of defrosting:
Condition of defrosting:
If any one of the following items is satisfied, AC
will enter the defrosting mode.
After the compressor starts up and keeps running,
mark the minimum value of T3 from the 10th
minutes to 15th minutes as T30.
1)If the compressor cumulate running time is up
to 29 minutes and T3< TCDI1, T3＋
T30SUBT3ONE≦T30.
2)If the compressor cumulate running time is up
to 35 minutes and T3< TCDI2, T3＋
T30SUBT3TWO≦T30.
3)If the compressor cumulate running time is up to
40 minutes and T3< -11ºF (-24C)for 3 minutes.
4)If the compressor cumulate running time is up to
120 minutes and T3<-5ºF (-15ºC).
Condition of ending defrosting:
If any one of the following items is satisfied, the
defrosting will finish and the machine will turn to
normal heating mode.
----T3 rises to be higher than TCDE 34ºF(1ºC).
----T3 keeps to be higher than TCDE 36ºF (2ºC)
for 80 seconds.
----The machine has run for 10 minutes in
defrosting mode.
Defrosting action：
off
on
Cool-F9
10S
30S
TimeA
10S
4-way valve
defrosting
Defrosting over
compressor
Indoor fan
Outdoor fan
EXV open
frequency
Max 10 minutes
frequency
Compressor stops
off
Anti-cold control
off
480P
480P for 240s
Condition of ending defrosting:
If any one of following items is satisfied,
defrosting will stop and the machine will turn to
normal heating mode.
·T3 > TempQuitDefrost_ADD ºF;.
·The defrosting time achieves
10min.
·Turn to other modes or off.
6.4.3 Outdoor fan control
6.4.3.1 Cooling mode
Normally the system will choose the running fan
speed according to ambient temperature:
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Outdoor temperature ºF
Supper high fan speed
High fan speed
Middle fan speed
Low fan speed
Supper low fan speed
Breeze fan speed
F fan speed
G fan speed
H fan speed
I fan speed
When low ambient cooling is valid:
Outdoor fan speed control logical (low ambient
cooling)
When T4 <59 ºF (15ºC) and T3 < 86 ºF (30 ºC),
the unit will enter into low ambient cooling
mode. The outdoor fan will choose speed
according to T3.
When T3≥100.4 ºF (38 ºC) or when T4≥68ºF
(20ºC), the outdoor fan will choose the speed
according to T4 again.
100
Exit low ambient cooling
mode,run with high fan
for 1 minute
Low
86
81
73
off
T3
Increase fan speed increase
Keep current fan speed
Decrease fan speed
Fan stop
LowCoolT3_ON
LowCoolT3_Down
LowCoolT3_OFF
6.4.3.2 Heating mode
Normally the system will choose the running fan
speed according to ambient temperature:
Outdoor temperature ºF
70
Breeze fan speed
66
64
Supper low fan speed
61
59
Low fan speed
55
54
Middle fan speed
50
32
High fan speed
28
Supper high fan speed
6.4.4 Electronic Expansion Valve (EXV)
Control
1. EXV will be fully closed when turning on the
power. Then EXV will be standby with 350P open
and will open to target angle after compressor
starts.
2. EXV will close with -160P when compressor
stops. Then EXV will be standby with 350P open
and will open to target angle after compressor
113
109
82
79
77
73
72
68
66
63
50
48
32
30
23
21
14
12
ºF
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starts.
3. The action priority of the EXVs is A-B-C-D-E.
4. Compressor and outdoor fan start operation
only after EXV is initialized.
6.4.4.1 Cooling mode
The initial open angle of EXV is depend on indoor
model size, adjustment range is 100-400p. When
the unit start to work for 3 minutes, the outdoor
will receive indoor units( of capacity demand) T2B
information and calculate the average of them.
After comparing each indoor’s T2B with the
average, the outdoor gives the following
modification commands:
If the T2B＞average, the relevant valve needs
more 16p open;
If the T2B= average, the relevant valve’s open
range remains;
If the T2B＜average, the relevant valve needs
more 16p close.
This modification will be carried out every 2
minutes.
6.4.4.2 Heating mode
The initial open angle of EXV is depend on indoor
model size, adjustment range is 150-350p. When
the unit start to work for 3minutes, the outdoor will
receive indoor units (of capacity demand) T2
information and calculate the average of them.
After comparing each indoor’s T2 with the
average, the outdoor gives the following
modification commands:
If the T2＞average +4, the relevant valve needs
more 16p close;
If average +4 ≥ the T2 ≥ average -4, the relevant
valve’s open range remains;
If the T2＜average -4, the relevant valve
needs more 16p open.
This modification will be carry out every 2
minutes.
6.4.5 Four-way valve control
In heating mode, four-way valve is opened. In
defrosting, four-way valve operates in according
to defrosting action. In other modes, four-way
valve is closed. When the heating mode to other
modes, the four-way valve is off after compressor
is off for 2 minutes. Failure or protection (not
including discharge temperature protection, high
and low pressure protection), four-way valve
immediately shuts down.
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7. Wiring Diagrams
8.1 Wiring diagram of 1 drive 2 outdoor
KMIR218-H221
8.2 Wiring diagram of 1 drive 3 outdoor
KMIR327-H217
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8.3 Wiring diagram of 1 drive 4 outdoor KMIR436-H217
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