Mitsubishi Electric Fresh Master GUF-50RDH3 User manual

FRESH MASTER
HAND BOOK
(For HONG KONG)
Issued July 2004 No. U-101
Model: GUF-50RDH3
GUF-100RDH3
Notice:
The term of validity is for a year from the issued date.
MITSUBISHI ELECTRIC CORPORATION
Model name
FOR DEALERS
The picture is shown GUF-50RDH3.

Contents
Safety precautions.................................................................... 3-4
1. Specifications.......................................................................... 4
2. Dimensions.............................................................................. 5
3. Wiring diagrams ...................................................................... 6
4. Maintenance procedures.................................................... 7-14
4-1 Blower Parts...................................................................... 7-8
4-2 Damper Motor Part (All units available)................................ 9
4-3 Circuit Board Part............................................................ 9-10
4-4 Humidifier Parts............................................................. 10-11
4-5 Heat exchanger for refrigerant Part............................... 12-13
4-6 Solenoid valve and water sencor Part........................... 13-14
5. Parts list ........................................................................... 15-27
GUF-50RDH3................................................................ 16-21
GUF-100RDH3.............................................................. 22-27

—3—
♦♦
Turn off the power supply
Be sure to shut off the breaker before dis-
assembling the unit for repair.
(Failure to heed this warning may result in elec-
tric shock.)
♦♦
Use proper parts and tools
For repair, be sure to use the parts listed in the service
parts list of the applicable unit model and
use the proper tools.
(Failure to heed this warning may result in elec-
tric shock, fire and/or bodily injury.)
♦♦
Proper electric work
Use the electric wires designated for electric work, and
conduct electric work in accordance with the "Electric
Installation Engineering Standard," the "Indoor Wiring
Regulations," and the Installation Work
Guide.
(Incomplete connection or wiring installation may
result in electric shock and/or fire.)
♦♦
Replace damaged and/or degraded parts
Be sure to replace the power-supply cord and lead wire
in the event that they are damaged and/or
degraded.
(Failure to heed this warning may result in elec-
tric shock and/or fire.)
♦♦
Check insulation
Be sure to measure the insulation resistance once the
repair work is complete, and turn on the power supply
after verifying that an insulation resistance
of at least 1MΩis obtained.
(If an insulation problem exists, it may result in
electric shock.)
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Safety precautions
●Please be sure to read the following safety precautions thoroughly before commencing with the maintenance
work, and conduct the inspection and repair of the product in a safe manner.
●The types and levels of danger that may arise if the product is handled incorrectly are described by using the
warning symbols shown below.
♦♦
Electric shock
If you must inspect the circuitry while the
power is on, do not touch the live parts.
(Failure to heed this warning may result in elec-
tric shock.)
Caution for
electric shock
♦♦
Modification is prohibited
Do not modify the unit.
(Failure to heed this warning may result in elec-
tric shock, fire and/or bodily injury.)
Prohibited
♦♦
Do not mix anything other than (Use the specified
coolant of the same type used in the outdoor unit.)
Do not charge any coolant different from the coolant
used in the outdoor unit.
(Failure to heed this warning may cause the
pressure inside the freezing cycle to become
abnormally high, leading to bodily injury or other
damage.)
Prohibited
♦♦
Toxic gas generation
•Be careful that the coolant (R407C,R410A,R22) does
not leak in a flammable environment.
•Conduct welding operation in an open room.
•If the coolant gas leaks, open the windows while in
operation.
•Be sure to completely repair the leak. Close the ser-
vice valve if the repair work is temporarily suspended.
(If the coolant gas comes into contact with
flames such as open fire, sparks and a heater, it
may generate toxic gas.)
Be sure to follow
this instruction.
Incorrect handling of the product may result in serious injury
or death.
Warning

—4—
♦♦
Caution for bodily injury
•Do not conduct any work at a location
where you do not have a sure footing.
(Failure to heed this caution may result in a fall.)
•Wear gloves when conducting work.
(Failure to heed this caution may result in injury
to your hands from sharp metal or other edges.)
Prohibited
Be sure to follow
this instruction.
♦♦
Prevent water leakage
•Before removing any of the water-related parts, com-
pletely drain the residual water from the piping.
•After the repair is complete, be sure to check the
drainage of the indoor unit and that no water leaks
from any of the piping connections.
(Water leakage may cause buildings to soil,
leading to secondary failure of other parts.)
Be sure to follow
this instruction.
GUF-50RDH3
GUF-100RDH3
Single-
phase
220-240
50 1.15
2.20
235-265
480-505
m3/h
500
1,000
L/S
139
278
5.29
(1.66)
10.81
(3.49)
6.42
(2.25)
13.00
(4.70)
2.70
5.40
33.5-34.5
38-39
•The values given in the table for the noise level reflect the levels measured at a position 1.5 meters immediately below theunit in an anechoic
chamber.
•The noise at the air outlets (at a 45°angle, 1.5 meters in front) is about 5-6 dB (A) higher than the values given in the table.
•The above values apply during Lossnay ventilation when the fan speed is set to high speed.
* Capacity in ( ) is heat recovery capacity by Lossnay core.
Cooling/Heating capacity indicates the maximum value at operation under the following condition.
Cooling: Indoor: 27°C DB/19.5°C WB Outdoor: 35°C DB/24°C WB
Heating: Indoor: 21°C DB/14.6°C WB Outdoor: 7°C DB/6°C WB
57
98
Air
volume
External air load heat
processing capability (kw)
Heating
capability
P32
P63
Cooling
capability
Humidifying
volume
Model
name Power
supply
(V)
Frequency
(Hz) Current (A)
Power
con-
sumption
(W)
Noise
(dB) Weight (kg) Equivalent
indoor unit
capability
1. Specifications
•Inspect the grounding, and repair it if incomplete.
●Make sure that the product operates correctly upon completion of repair. Clean the product as well as the sur-
rounding area, and then notify the customer of the completion of repair.
Incorrect handling of the product may result in serious injury
or damage to properties including buildings and equipment.
Caution
Request during repair

—5—
2. Dimensions
Unit (mm)
G
P
ML
20
100
øH
øJ
C
(N) A
FE
ND
B
79 79
N
T
150 to 250
60
Q
79
R30
K
Air exhaust fan
Damper plate
Air supply fan
Ceiling suspension fixture (4places×13×30 length hole for GUF-50RDH3)
Ceiling suspension fixture (4 places×15×30 length hole for GUF-100RDH3)
RA
(Return air)
Control box
Maintenance cover
EA
(Exhaust air)
High efficiency filter
(Optional part)
Gas pipe(U)
Drain discharge hole
(VP25 connection)
Lossnay core
Liquid pipe (V)
Heat exchanger
Air filters
SA
(Supply air)
OA
(Outdoor air)
Ceiling suspension fixture Maintenance cover
Location at which the duct direction can be changed
Lossnay core
Air filter
High efficiency filter
Fan
Maintenance space
Inspection
opening Inspection opening
Solenoid valve unit with
pressure regulator*
Solenoid valve
Heat exchange unit
Humidifying element
Maintenance space
Power cable
installation port
Can install upper area of ceiling suspension fixture
(GUF-100RDH3)
Location at which the duct direction can be changed
Humidifying element*
S (Water intake)
(Discharge hole)
Water intake strainer
with check valve
(PT1/2 External thread)
More than 600
External Ceiling suspension Duct connection Duct pitch Humidification Flare
Inspection
Model dimension
fixture pitch flange
opening
ABCDEF
Nominal
GHJ K LMNP QR ST
diameter
GUF-50RDH3 1288 1016 317 1185 1048 22 200 158.5 192 208 745 372.5 435 124 347 135 99 266 450
GUF-100RDH3 1580 1231 398 1465 1271 16 250 199 242 258 920 460 670 149 361 169 110 280 6
U
ø12.7
ø15.88
ø6.35
ø9.52
V
00
GUF-50RDH3,GUF-100RDH3

—6—
3. Wiring diagrams
GUF-50RDH3,GUF-100RDH3

—7—
4. Maintenance procedures
4-1 Blower Parts
1Remove the cover fixing special screw.
2Pull back the hinged clip.
2Open the door and lift off of the hinge brackets.
3Remove Filters from the unit.
4Remove Lossnay cores from the unit.
Special screw Hinge
Lossnay core Filter
Maintenance cover
5Remove screw from the core-guide,Remove core-
guide.
Core Guide

—8—
6Remove separator from the blower portion.
7Remove connections motor lead wire.
8Remove screws from the motor base.
9Remove the pre-assembled blower.
Separator
Motor Base Motor
Pre-assembled Blower

—9—
4-2 Damper Motor Part (All units available)
4-3 Circuit Board Part
1Remove the 4 screws from the control cover.
1Remove (2) screws out from the damper motor cover.
2Take the damper motor out of the cover.
Damper Motor Cover
Damper Motor
Control Cover
Screw
2Remove the 3 screws from capacitors.
(2 screws for the GUF-50RDH3)
Capacitors

—10—
3Remove all harnesses connected to the circuit board.
4Take the circuit board out.
Circuit Board
4-4 Humidifier Parts
The photograph shows GUF-100RDH3.
1Remove the 7 screws to remove the humidifier cover. Screw Humidifier cover
2Remove the Humidifier cover (Inner lid). Humidifier cover (Inner lid)

—11—
3Remove the water supply tube from the humidifying ele-
ment. Water supply tube
Hose band
Water supply tube
Solenoid valve unit with
pressure regulator
Humidifying
element
Water supply tube
[1]
[2]
[3]
[4]
[5]
[6]
4Holding the hose bands indicated by [1] to [6] with your
fingers, remove the water supply tubes. Referring to the
procedure entitled “removing the humidifying elements”
below, remove the water supply tube at the rear while
taking out the front humidifying element.
Caution:
•To remove the water supply tube, hold and slide the
hose bands and remove the water supply tube.
•Do not remove the water supply tube from the sole-
noid valve unit with a pressure regulator.
•When removing the water supply tube, be sure that
water is collected on the drain tray inside the main
unit.
5Remove the humidfying elements. Humidifying element

—12—
4-5 Heat exchanger for refrigerant Part
1Remove the 11 screws to remove cover (L) and cover (S).
(9 screws for the GUF-50RDH3) Cover (L) Screw Cover (S)
5Remove the 2 screws to remove the Fix plate.
Screw Fixture Heat exchanger
Connection Humidifying element
Fix plate 2 screws
2Remove connections of themistor lead wire and lenear
expansion valve lead wire.
3Remove the 2 screws to remove the Fixture.
4Remove the heat exchanger from the unit.

—13—
4-6 Solenoid valve and water sencor Part
1Remove connections of solenoid valve lead wire
and water sencor lead wire.
2Remove pipes connected to the solenoid valve.
Connection Solenoid Valve
cover (solenoid valve)
Connection for water sencor
3Remove the 2 screws to remove the cover (solenoid
valve).
4Remove the 2 screws to remove the solenoid valve.
Solenoid valve
Water sensor and solenoid valve installation
positions

—14—
5Remove a screw to remove the water sencor.
Water sensor plate
Fixing position of
water sensor plate
(GUF-50RDH3)
Installed condition of GUF-100RDH3
6The hole at the fixing position of the water sensor plate
(GUF-50RDH3) is no longer visible. Installed condition of GUF-50RDH3
Fixing position of
water sensor plate
(GUF-100RDH3)

—15—
5. Parts list
Please note the following when using the parts list.
1. When ordering parts, always indicate the part number, part name, and number of parts
required.
2. Parts are not always available, and it may take time for you to receive them.
3. There may be specification improvements or prices changes.
4. Specifications and prices are as of July 2004.
5. Parts marked are critical for safety. To maintain safety and performance, always
replace these parts with the parts prescribed.
6. The numbers that are circled in the exploded view are the same as the reference
number for the part being indicated.
Description of screw abbreviations
Screw 4×16
Abbreviation
PC screw
PRC screw
PP screw
SW · PP screw
PPT screw
PCT screw
PTT screw
PT screw
SET screw
SQ · SET screw
P · SET screw
PMT screw
HS · SET screw
P · R · W screw
P · C · W screw
P · R · C · W screw
R · W screw
PW · PP screw
SW-PW · PP screw
Description
Cross recess flat head machine screw
Cross recess oval head machine screw
Cross recess pan head machine screw
Cross recess pan head screw with spring washer
Cross recess tapping screw
Cross recess flat head tapping screw
Cross recess truss head tapping screw
Cross recess truss head machine screw
Slotted head stop screw
Square head stop screw
Pan head stop screw
Primer truss head screw
Hexagon head stop screw
Cross recess round wood screw
Cross recess flat head wood screw
Cross recess round and flat wood screw
Slotted round wood screw
Cross recess pan head screw with small washer
Cross recess pan head machine screw with spring washer and flat washer
Screw diameter Length

ModelGUF‑50RDH3
No.
PartsNo.
Nameofpart
Critical
Remarks
Price
forsafety
1. Y50062718 Filter 2
2. H00000488 PTTscrew4×12 2
3. R50216381 Coreguide 1
4. R50216710 Lossnaycore 2
5. R50263381 Coreguide 1
6. R50474737 Linearexpansionvalve 1
7. H00000487 PTTscrew4×8 38
8. R50028610 Flange 4
9. R50351708 Cover 2
10. R50466344 Hinge 1
11. Y50029712 Fixplate 1
12. R50095380 Hanger 4
13. H00000244 PTscrew6×12 8
14. M34074017 Specialscrew4×11 1
15. R50429691 Cover(L) 1
16. Y55007366 Modelname 1
17. X50002707 Maintenancecover 1
18. R50429697 Cover(S) 1
19. H00189007 PTTscrew5×10 13
20. R50429700 Fixplate 1
21. R50429698 Humidifiercover 1
22. R50429699 Fixplate 1
23. R50395319 Strainer 1
24. R50429303 Pipe 1
25. R40647340 Thermistor 1 Liquidpipe
25. R40632936 Thermistor 1 Gaspipe
26. R50429486 Humidifiercover(IN) 1
27. Y55001319 Solenoidvalve 1 200VSV2
28. R50429692 Cover(Solenoidevalve) 1
29. R50261714 Humidifyingelement 2
30. R50117223 Hoseband 1
31. R50261223 Hoseband 4
32. R50428390 Tube 1
33. R50429390 Tube 1
34. R50429389 Tube 1
35. R50117708 Watersensor 2
36. M35282045 Specialscrew4×12 3
37. H00260045 PTTscrew4×8 6
38. Y55007692 Watersensorplate 1
39. R50472699 Heatexchanger 1 Refrigerant
Q'ty
pcs/unit
!"!"

—17—
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
8
7
12
13 7
7
2
12
13
31 31
1
7
19 19
7
8
7
8
12
13

ModelGUF‑50RDH3
No.
PartsNo.
Nameofpart
Critical
Remarks
Price
forsafety
51. R50331067 Specialnut 2
52. M34398077 Tabwasher 2
53. R50351480 Centrifugalfan 2 φ220
54. R50478707 Motorbase 2
55. M34706465 Specialwasher 2
56. Y50062452 Motor 1
57. R50351713 Motorfixplate 2
58. H00189007 PTTscrew5×10 16
59. Y55003451 Motor 1
Q'ty
pcs/unit
!#!"

—19—
51 52 53 54 55 56 57 58 59
Air Supply fan assembly
Air Exhaust fan assembly
58
58
58
55
57
53
52 51
54

ModelGUF‑50RDH3
No.
PartsNo.
Nameofpart
Critical
Remarks
Price
forsafety
71. R50472716 Dampersupport 1
72. R50069156 Pullspring 1
73. R50054225 Bush 2
74. R50232150 Rod 1
75. Y50061693 Dampermotorcover 1
76. Y50061260 Dampermotor 1 220×240V
77. H00312007 PTTscrew4×6 3
78. Y55003216 Thermistor 1
79. D41093224 Cordclamper 1
80. R50399224 Cordclip 5
81. H00000349 PTscrew4×8 1
82. Y55001217 Transformer 1
83. H00013076 Lockwasher 3
84. H00011008 PTscrew4×8(BS) 3 Forearth
85. Y55007367 Wiringdiagram 1
86. R50429693 Cover 1
87. R50430693 Sideplate 1
88. R50351225 Bush 4
89. R50472715 Damper 1
90. M31234089 Specialbush 2
91. R50429701 Terminalfixplate 1
92. M13100242 Terminal 1 3P
93. H00000007 PPTscrew4×25 1
94. Y55007235 Capacitor 1 4μF･440VAC
95. H00000332 PTTscrew4×10 2
96. Y55003235 Capacitor 1 4μF･440VAC
97. R50429695 PCBfixplate 1
98. Y55003215 Resistor(lead) 1
99. R50327730 PCBfixplate 1
100. Y55007171 Circuitboard 1 FU‑M04‑D4
101. Y55001698 Separator 1
102. Y55001699 Separator 1
Q'ty
pcs/unit
$%!"