Mitsubishi Electric PUHZ-HRP200YKA User manual

SERVICE MANUAL
SPLIT-TYPE, AIR TO WATER HEAT PUMP
No. OCH466
CONTENTS
1. SAFETY PRECAUTION...........................................2
2. SPECIFICATIONS...................................................... 5
3. DATA
.............................................................................. 7
4. OUTLINES AND DIMENSIONS ............................9
5. WIRING DIAGRAM..................................................10
6. WIRING SPECIFICATIONS ..................................11
7. REFRIGERANT SYSTEM DIAGRAM....................13
8. TROUBLESHOOTING............................................14
9. DISASSEMBLY PROCEDURE............................47
November 2009
Note:
•This manual describes only
service data of the outdoor unit.
•Refer to Technical manual of
ATW, I/F and FTC.
•RoHS compliant products have
<G> mark on the spec name
plate.
R410A
PUHZ-HRP200YKA
PARTS CATALOG (OCB466)
[Model name]
PUHZ-HRP200YKA
[Service Ref.]
PUHZ-HRP200YKA

2
SAFETY PRECAUTION
1
Cautions for units utilizing refrigerant R410A
1-2. CAUTIONS RELATED TO NEW REFRIGERANT
1-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
Charge refrigerant from liquid phase of gas cylinder.
If the refrigerant is charged from gas phase, composition change may occur in refrigerant and the efficiency
will be lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil etc.
Use a vacuum pump with a reverse flow check valve.
Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction
of compressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered.
Electronic refrigerant
charging scale
Vacuum pump adaptor
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Preparation before the repair service.
• Prepare the proper tools.
• Prepare the proper protectors.
• Provide adequate ventilation.
• After stopping the operation of the air conditioner, turn off the power-supply beaker.
• Discharge the condenser before the work involving the electric parts.
Precautions during the repair service.
• Do not perform the work involving the electric parts with wet hands.
• Do not pour water into the electric parts.
• Do not touch the refrigerant.
• Do not touch the hot or cold areas in the refrigerating cycle.
• When the repair or the inspection of the circuit needs to be done without turning off the power,
exercise great caution not to touch the live parts.

3
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
No. Tool name Specifications
1Gauge manifold · Only for R410A
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3 MPa·G or over.
2Charge hose · Only for R410A
· Use pressure performance of 5.09 MPa·G or over.
3Electronic scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Only for R410A Top of cylinder (Pink)
Cylinder with syphon
8Refrigerant recovery equipment —

4
1-3. CAUTIONS FOR REFRIGERANT PIPING WORK
Tools for R410A (The following table shows whether conventional tools can be used or not.)
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Safety charger
Charge valve
Vacuum pump
Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale
Vacuum gauge or thermis-
tor vacuum gauge and
vacuum valve
Charging cylinder
Air purge, refrigerant charge
and operation check
Gas leak check
Refrigerant recovery
Refrigerant charge
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Prevent gas from blowing out
when detaching charge hose
Vacuum drying and air
purge
Bend the pipes
Cut the pipes
Weld the pipes
Charge refrigerant
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refri-
gerant to thermistor vacuum gauge)
Refrigerant charge
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adap-
ter for reverse flow check
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
Tools and materials Use R410A tools Can R22 tools be used?
(Usable if equipped
with adapter for rever-
se flow)
Can R407C tools be used?
(Usable if equipped
with adapter for rever-
se flow)
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.

5
SPECIFICATIONS
2
2-1. SPECIFICATION
2.-1-1. PUHZ-HRP200YKA
<Reference data> Plate heat exchanger (ACH50-50 plates) *2pcs [connected in parallel]
Nominal water flow L/min 65.9
Heating
(A7/W35)
Capacity kW 23.0
COP 3.65
Power input kW 6.31
Heating
(A7/W45)
Capacity kW 23.0
COP 2.77
Power input kW 8.29
Heating
(A7/W55)
Capacity kW 23.0
COP 2.27
Power input kW 10.15
Heating
(A-7/W35)
Capacity kW 23.0
COP 2.24
Power input kW 10.25
Heating
(A-7/W45)
Capacity kW 23.0
COP 1.93
Power input kW 11.90
Heating
(A-7/W55)
Capacity kW 23.0
COP 1.66
Power input kW 13.86
Heating
(A-15/W35)
Capacity kW 23.0
COP 2.05
Power input kW 11.24
Heating
(A-15/W45)
Capacity kW 22.2
COP 1.80
Power input kW 12.36
Heating
(A-15/W55)
Capacity kW 21.2
COP 1.36
Power input kW 15.64
Heating
(A2/W35)
Capacity kW 23.0
COP 2.37
Power input kW 9.69
Nominal water flow L/min 57.3
Cooling
(A35/W7)
Capacity kW 20.00
EER 2.22
Power input kW 9.01
Cooling
(A35/W18)
Capacity kW 20.00
EER 3.55
Power input kW 5.64
Rating conditions
Nominal operating condition
Heating (A2/W35)
Outside air temperature (Dry-bulb) + 2 °C
Outside air temperature (Wet-bulb) + 1 °C
Water temperature (inlet/outlet) + 30 °C/+ 35 °C
Heating (A7/W35)
Outside air temperature (Dry-bulb) + 7 °C
Outside air temperature (Wet-bulb) + 6 °C
Water temperature (inlet/outlet) + 30 °C/+ 35 °C
Heating (A7/W45)
Outside air temperature (Dry-bulb) + 7 °C
Outside air temperature (Wet-bulb) + 6 °C
Water temperature (inlet/outlet) + 40 °C/+ 45 °C
Heating (A7/W55)
Outside air temperature (Dry-bulb) + 7 °C
Outside air temperature (Wet-bulb) + 6 °C
Water temperature (inlet/outlet) + 50 °C/+ 55 °C
Heating (A-7/W35)
Outside air temperature (Dry-bulb) - 7 °C
Outside air temperature (Wet-bulb) —
Water temperature (inlet/outlet) — °C/+ 35 °C
Heating (A-7/W45)
Outside air temperature (Dry-bulb) - 7 °C
Outside air temperature (Wet-bulb) —
Water temperature (inlet/outlet) — °C/+ 45 °C
Heating (A-7/W55)
Outside air temperature (Dry-bulb) - 7 °C
Outside air temperature (Wet-bulb) —
Water temperature (inlet/outlet) — °C/+ 55 °C
Heating (A-15/W35)
Outside air temperature (Dry-bulb) - 15 °C
Outside air temperature (Wet-bulb) —
Water temperature (inlet/outlet) — °C/+ 35 °C
Heating (A-15/W45)
Outside air temperature (Dry-bulb) - 15 °C
Outside air temperature (Wet-bulb) —
Water temperature (inlet/outlet) — °C/+ 45 °C
Heating (A-15/W55)
Outside air temperature (Dry-bulb) - 15 °C
Outside air temperature (Wet-bulb) —
Water temperature (inlet/outlet) — °C/+ 55 °C
Cooling (A35/W7)
Outside air temperature (Dry-bulb) + 35 °C
Outside air temperature (Wet-bulb) + 24 °C
Water temperature (inlet/outlet) + 12 °C/+ 7 °C
Cooling (A35/W18)
Outside air temperature (Dry-bulb) + 35 °C
Outside air temperature (Wet-bulb) + 24 °C
Water temperature (inlet/outlet) + 23 °C/+ 18 °C
Note: "COP" and "Power input" in the above table are values that does NOT contains the "pump input (based on EN 14511)".

6
2-1-2. Outdoor unit
Maximum outlet water temperature
*1 Hot gas with 4-way valve
*2 at distance of 1m from outdoor unit
*3 grill
*4 With the optional air outlet guide, the operation at
-15㷄outdoor temperature is possible.
40
45
50
55
60
65
-25-20-15-10 -5 0 5 10
Ambient temperature [㷄]
Maximum outlet water temptemperature [㷄]
Model name PUHZ-HRP200YKA
Running current
Heating(A7/W35) A 9.6
Cooling(A35/W7) A 13.7
Power factor Heating(A7/W35) %95
Cooling(A35/W7) %95
Power supply (phase, cycle, voltage) 3 phase, 50 Hz, 400 V
Max. current A 25.0
Breaker size A 32
Outer casing Galvanized plate
External finish Munsell 3Y 7.8/1.1
Refrigerant control Liner expansion valve
Compressor Hermetic scroll
Model ANB66FJHMT
Motor output kW 4.7
Start type Inverter
Protection devices HP switch
LP switch
Discharge thermo
Oil (Model) L 1.7 (FV50S)
Crankcase heater W —
Heat exchanger Air Plate fin coil
Water Plate heat exchanger
Fan Fan (drive) × No. Propeller fan × 2
Fan motor output kW 0.150 × 2
Air flow m³/min 140
(CFM) (4,940)
Defrost method Reverse cycle *¹
Noise level (SPL) Heating dB 59 *²
Cooling dB 58 *²
Dimensions Width
mm (in.) 1050 (41-5/16)
Depth mm (in.) 330 + 30 *³ (13+1-3/16)
Height mm (in.) 1338 (52-11/16)
Weight kg (lbs) 145 (320)
Refrigerant R410A
Quantity kg (lbs) 7.1 (15.7)
Guaranteed operating
range (Outdoor)
Heating °C -25 ~ +35
Cooling °C -5 *4 ~ +46
Outlet water temp.
(Max. in heating, Min. in cooling)
Heating °C +60
Cooling °C +5
Nominal return water
temperature range
Heating °C +10 ~ +59
Cooling °C +8 ~ +28
Water flow rate range L/min 28.7 ~ 68.9

7
DATA
3
1.5m
1m
MICROPHONE
UNIT
GROUND
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
PUHZ-HRP200YKA
COOLING
MODE
HEATING
58
SPL(dB)
59
LINE
3-2. NOISE CRITERION CURVES
Total piping length (one way)
Amount of additional refrigerant charge (kg)
30 m and less 31-40 m 41-50 m 51-60 m 61-70 m 71-80 m
No additional
charge necessary
Calculate the amount of additional refrigerant
charge using formula provided below.
For single combination
(1 indoor unit)
For twin / triple /
quadruple combination
(2-4 indoor units)
1.4 kg 2.8 kg
0.9 kg 1.8 kg
4.2 kg 5.6 kg 7.0 kg
At time
of
shipping
7.1 kg
3-1. Addition of refrigerant
When length exceeds 50 m for twin / triple / quadruple combination
When the total length of the piping exceeds 50 m, calculate the amount of additional charge based on the following requirements.
Note: If the calculation produces a negative number (i.e. a “minus” charge), of if calculation results in an amount that is less than the “Additional charage amount for 50 m”,
perform the additional charge using the amount shown in “Additional charge amount for 50 m”.
Amount of additional
charge =
Main piping:
Liquid line size
ø12.7 overall length ×
0.17 +++–
4.3 (kg)
(kg) (m) × 0.17 (kg/m)
Additional charge amount
for 50 meters 1.8 kg
Main piping:
Liquid line size
ø9.52 overall length ×
0.14 (Gas line: ø25.4)
(m) × 0.14 (kg/m)
Branch piping:
Liquid line size
ø9.52 overall length ×
0.05 (Gas line: ø15.88)
(m) × 0.05 (kg/m) (m) × 0.02 (kg/m)
Branch piping:
Liquid line size
ø6.35 overall length ×
0.02
Permissible total
piping length
A+B+C+D+E
A+B or A+C
or
A+D or A+E
Charge-less
piping length
A+B+C+D+E
HRP200 : A+B+C(+D)(+E) ≤80 m
* “D” is for triple“.
* “E” is for four (quadruple).
Indoor unit
Outdoor unit
Multi distribution pipe (option)
Height difference (Indoor unit-
Outdoor unit) Max. 30 m
Height difference (Indoor unit-
Indoor unit) Max. 1 m
A: Main piping
B, C, D, E: Branch
Max. 20m
piping
<Limits of refrigerant piping installation>
|B-C |or |B-D |or
|B-E |or |C-D |or
|C-E |or |D-E |
No. of bends
Within 15
80 m and less 70 m and less 30 m and less
8 m and less

8
3-3. Standard operation data Reference data (connect to Plate HEX)
(ACH50-50 plates) o2 pcs [connected in parallel]
Mode
Cooling
(A35/W7)
Heating
(A7/W35)
Total
Capacity W 20,000 23,000
Input kW 9.01 6.31
Electrical circuit
Outdoor unit PUHZ-HRP200YKA
Phase, Hz 3, 50
Voltage V 400
Current A 13.7 9.6
Refrigerant circuit
Discharge pressure MPa 3.0 2.0
Suction pressure MPa 0.7 0.6
Discharge temperature ºC 79 73
Condensing temperature ºC 49 35
Suction temperature ºC 8 8
Evaporating temperature ºC 6 2
Evaporator inlet temperature ºC 7 ——
Evaporator outlet temperature ºC 6 ——
Condenser inlet temperature ºC —— 65
Condenser outlet temperature ºC —— 34
Water
conditions
Flow volume L/min 57.3 65.9
Outlet water temperature ºC 7 35
Outdoor
conditions
Intake air
temperature
D.B. ºC 35 7
W.B. ºC 24 6
Piping length : Main 2.5m, Branch 2.5m / 2.5m
The unit of pressure has been changed to MPa based on international SI system.
The conversion factor is: 1 (MPa) = 10.2 (kgf/cm²)
3-4. CAPACITY CORRECTION (Refrigerant piping length)
Cooling and heating capacity is lowered according to the piping length. Capacity can be obtained by referring to the following
capacity curves.
Corrected pipe length (m) = actual pipe length (m) + number of bends × 0.3 (m)
Cooling
Heating
5 101520253035404550556065707580
70
75
80
85
90
95
100
Corrected pipe length [m]
Capacity ratio [%]
HRP200
HRP200

9
OUTLINES AND DIMENSIONS
4
Unit: mm
PUHZ-HRP200YKA
FOUNDATION
30
Service space
150
500
500
10
The diagram below shows a basic example. Explanation of particular details are given in the installation manuals etc.
Dimensions of space needed
for service access are
shown in the below diagram.
<Foundation bolt height>
Please secure the unit firmly with 4 foundation (M10) bolts. (Bolts and washers must be purchased locally.)
1 FREE SPACE (Around the unit) 2 SERVICE SPACE 3 FOUNDATION BOLTS
4 PIPING-WIRING DIRECTIONS
Piping and wiring connections can be made from 4 directions: FRONT,Right,Rear and Below.
Less than
Over
Over
Over
Over
Over 10mm
Over 10mm
FREE
Over 150mm
Over 1000mm
···Refrigerant GAS pipe connection (attached JOINT)ø25.4(Brazing locally) ···Refrigerant LIQUID pipe connection (FLARE) ø 9.52(3/8F) *1···Indication of STOP VALVE connection location. *2···(FLARE)ø 19.05(3/4F)
1
2
Example of Notes
Piping Knockout Hole Details
Power supply wiring hole (ø27Knockout)
Front piping hole (Knockout)
Front trunking hole (Knockout)
Power supply wiring hole (ø40Knockout)
60 55
6373
55
27
26
75
92
60
ø92
Power supply wiring hole (ø27Knockout)
Right piping hole (Knockout)
Right trunking hole (Knockout)
Power supply wiring hole (ø40Knockout)
75 50
26 27
63
73
29 92
55
92
60
ø92
Power supply wiring hole (ø27Knockout)
Rear piping hole (Knockout)
Rear trunking hole (Knockout)
Power supply wiring hole (ø40Knockout)
75
6055
6373
26
55
27
60
92
ø92
Drain hole (5-ø33)
Bottom piping hole (Knockout)
81
45
154136
110 160 160 160
86
1050
Rear Air Intake
Air Discharge
Side Air Intake
Installation Feet
2-U Shaped notched holes (Foundation Bolt M10)
2-12×36 Oval holes (Foundation Bolt M10)
28
370
60
30
225
225
330
600
417
19
70
42
40 53
56
0
Handle for moving
Rear Air Intake
Side Air Intake
Handle for moving
632
369
26
1338
Handle for moving
Handle for moving
Earth terminal
362
Brazing
Service panel
Terminal connection
Left···Power supply wiring Right···Indoor/Outdoor wiring
*1,*2 : 442
982
986
*1 450
342
Air intake
2
1
Front piping cover
Rear piping cover

10
5WIRING DIAGRAM
PUHZ-HRP200YKA
CN2
(WHT)
7
7
1
P. B .
2
2
1
2
2
1
CN4
(WHT)
CN5
(RED)
WHT
FUSE1 FUSE2
WHT
RED
RED
MS
3~
POWER
SUPPLY
3N~
400V 50Hz
INDOOR
UNIT
TB1
L3
L2
L1
NU
U
UU
U
31
2
2
13
CNDC
(PNK) CNL (BLU)
3112
CNCT
(RED) CNAC2 (RED)
31
CNAC1
(WHT)
BLK BLK
WHT WHT
U
LO 1
LO 2
LO3
LI 1
LI 2
LI 3
NI
RED
WHT
BLU
BLK
GRN/YLW
GD2GD1
RED
WHT
BLK
N. F.
TB2
DCL
ACL4
S3
S2
S1
ORN YLW
CY2 CY1
BRN
RED
RED
RS
RED
WHT
WHT
WHT
BLK
BLK
BLK X52A
BLK
BLK
TB-P2
TB-P1 TB-C1 TB-N1
CB1 CB2
W
V
MC
U
TB-L1
TB-L2
TB-L3
SC-U
SC-V
SC-W
RED
FUSE1, FUSE2
Connector<Connection for Option>
CN51
Relay
X51,X52,X54
Connector<Connection for Option>
CN3S
TB1
MC
MF1,MF2
21S4
63H
TH3
TH4
TH6
TH7
LEV-A,LEV-B,LEV-C
DCL
Terminal Block<Power Supply>
TB2 Terminal Block<Indoor/Outdoor>
Motor for Compressor
Fan Motor
Solenoid Valve (Four-Way Valve)
High Pressure Switch
63L Low Pressure Switch
63HS High Pressure Sensor
Thermistor<Outdoor Pipe>
SC-U/V/W
TB-L1/L2/L3
Connection Terminal < U/V/W-Phase >
Thermistor<Discharge>
Thermistor<Outdoor 2-Phase Pipe>
Thermistor<Outdoor>
Thermistor<Suction>
TH32
Fuse<T15AL250V>
Electronic Expansion Valve
Reactor
ACL4
Reactor
Connection Terminal < L1/L2/L3-Power supply >
P. B .
Power Circuit Board
RS
Rush Current Protect Resistor
CB1,CB2
Main Smoothing Capacitor
Connection Terminal
Noise Filter Circuit Board
Connection Terminal
< L1/L2/L3/NI-Power supply >
Connection Terminal < Ground >
52C Relay
N.F.
LI1/ LI2/LI3/NI
LO1/ LO2/LO3
Connection Terminal < L1/L2/L3-Power supply >
GD1,GD2
Controller Circuit Board
C.B.
TB-C1
X52A
Connection Terminal TB-N1
SYMBOL NAME SYMBOL NAME SYMBOL NAME
Connection Terminal
TB-P1
Connection Terminal
TB-P2
Switch < Function Setup >
Switch < Forced Defrost, Defect History Record
Reset, Refrigerant Address
>
Switch < Test Operation >
Switch < Function Switch >
Switch < Model Select >
SW1
SW4
SW5
SW6
SW8
Switch
SW9
Switch < Pump Down >
SWP
Connector < Emergency Operation >
LED < Operation Inspection Indicators >
CN31
F3,F4
CNMNT
CNVMNT
CNDM
Connector
< Connected for Option (Contact Input) >
Fuse < T6.3AL250V >
LED1,LED2
CNM
Connector < A-Control Service Inspection Kit >
SS
Connector < Connection for Option >
SV1
Connector < Connection for Option >
Connector
< Connected to Optional M-NET Adapter Board >
Connector
< Connected to Optional M-NET Adapter Board >
Switch < Function Setup >
SW7
Capacitor
CY1,CY2
LEV-A
(WHT)
61
3
LEV-B
(RED)
61
CNVMNT
(WHT)
CN4
(WHT)
CNMNT
(WHT)
31 5 1
CN5
(WHT)
31
LED2
SW1
SW11
SW12
LED3
LED4
TB7
LED1 LED5
5
1
2
5
1CND
(WHT)
CN2M
(WHT)
M-NET
When M-NET adapter is connected
12
34
CNS
(WHT)
13
21S4
(GRN)
MF1
TRANS
MF2
CNF1
(WHT)
CNF2
(WHT)
1
3
CNDC
(PNK)
CN2
(WHT)
CNAC
(WHT)
13
SV1
(GRY)
X54
X51
X52
13 SS
(WHT)
C.B.
1
F3
F4
TH7/6
(RED)
63H
(YLW)
TH3
(WHT) TH4 (WHT)
TH7 TH3 TH4
4121
21 31
31
TH6
63H
2
2
1
7
23
7
1
7
1
71
LEV-A LEV-B
MM
LED1
LED2
CNM
(WHT)
1
14
1
3
1
5
3
5
CNDM
(WHT)
CN51
(WHT) SW7
SW6SW1
SW9
CN31
+3
+1+1
SW5SW8SW4SWP
21S4
ABS
MS
3~
MS
3~
M-NET SUBSTRATE
TH32
(BLK)
TH32
2
t° t° t° t°
t°
1
63L
(RED)
31
63L
5
LEV-C
(BLU)
6
1
LEV-C
M
5
63HS
63HS
(WHT)
MODEL SW6
+1 MODEL SELECT
SW5-6 +2
12345678
+2 SW5 -1 to 5 : Function Switch.
OFF
123456
OFF
ON
HRP
200Y
ON
1234
OFF
ON
1234
OFF
ON
SW9-3.4 +4
Ambient temp.
3°C or less
(lnitial setting)
+3Setting of the starting ambient temp. of the
flash Injection.
+4 SW9-1 to 2 : Function Switch
0°C or less
-3°C or less
-6°C or less
1234
OFF
ON
1234
OFF
ON
indicates a switch position.