Summary of Contents for Mitsubishi Electric FRESH MASTER GUF-50RD4
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June 2014 No. U189-A FRESH MASTER HANDBOOK Model : GUF-50RD GUF-50RDH GUF-100RD GUF-100RDH GUF-100RDH Nameplate Repair work must be performed by the manufacturer, its service agent or a similarly qualified person in order to avoid hazards.
1. Safety precautions Read the following precautions thoroughly before the maintenance, and then inspect and repair the product in a safe manner. The types and levels of danger that may arise if the product is handled incorrectly are described with the warning symbols shown below.
Incorrect handling of the product may result in injury or Caution damage to properties including buildings and equipment. Caution for injury Prevent water leakage Do not work at a location where you do not have a • Before removing any of the water-related parts, sure footing.
Indoor: 20°C DB/13.8°C WB Outdoor: 7°C DB/6°C WB • Mitsubishi Electric measures products according to Japan Industrial Standard (JIS B 8628). • In the United Kingdom, on-site measurements by pitot tube method could be as much 20% different from JIS test room conditions.
4. Outside dimensions GUF-50RD GUF-50RDH GUF-100RD GUF-100RDH GUF-100RDH Location at which the duct direction can be changed Ceiling suspension fixture Damper plate (4×13×30 length hole for GUF-50 types) Air exhaust fan (4×15×30 length hole for GUF-100 types) (Exhaust air) (Return air) Air supply fan (Supply air) (Outdoor air)
6. Circuit board diagrams Circuit board diagrams and check points <FU-M05-D4> 1 GUF-50RD GUF-50RDH GUF-100RD GUF-100RDH Fuse Power supply 220-240 V AC 50 Hz 16 to 23 V AC Supply fan Exhaust fan External humidifier control input Operation monitor output Supply fan Error monitor output 220-240 V AC...
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2 GUF-100RDH Fuse (6.3 A/250 V) Transformer primary (input) Power supply Transformer secondary (output) 220 V AC 60 Hz 16 to 23 V AC Supply fan (Common) Exhaust fan External humidifier (Common) control input Operation monitor output Supply fan high Error monitor output 220 V AC 60 Hz...
7. Troubleshooting Work precautions • When servicing, be sure to recreate the malfunction two or three times before starting repairs. • When servicing, always keep proper footing. • When servicing, make sure that the power supply isolator is off, so as no electrical shock or injury to occur. Pay sufficient attention when working on the product.
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Signal cables to external devices (Table 1-3) Check the following checkpoints when outputting the operation monitor and malfunction monitor. Checkpoint Action 1 Do the signal cables meet regulations? ( Type, diameter ) Use specified cables. 2 Is the signal cable wired at least 5 cm away from the power supply cable? Wire the signal cable at least 5 cm away from the power supply cable.
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State of machine Remote controller Cause Remedy Does not operate. The power display When a power supply unit is used: 1 The power supply unit is not con- 1 Connect the power supply unit with “ ” does not nected with the transmission cable. the transmission cable.
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(2) Troubleshooting 2: An error code is displayed on the remote controller. See below for possible remedies when there is an error during test operation and followed by a 4-digit CHECK number is displayed on the remote controller. Note: The components marked with * are available for GUF-50/100RDH types only.
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Error code Error content Cause Remedy 6603 Communication er- The transmission processor cannot Inspect the transmission waveform and ror (Bus busy error transmit data because short-period volt- noise in the transmission cable line. in the transmission ages such as noise continuously occurs line) in the transmission cable line.
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Error code Error content Cause Remedy 6607 Communication er- System connected with MELANS Refer to the remedy for the single coolant ror (No ACK error) a) Malfunction only in some of the units system • Refer to the causes for the single coolant system b) Malfunction in all the indoor units and Check the error display LEDs of the out-...
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Error code Error content Cause Remedy 6831 MA remote control- Contact failure of the MA remote con- Check the transmission cable for discon- 6832 ler communication troller transmission cable nection or looseness. 6833 error The voltage/signal in the MA remote Check the transmission cable if the length 6834 controller transmission cable drops.
8. Overhauling procedures Work precautions • When touching the electric components such as circuit boards and fan motors, do not touch the components for more than 5 minutes after power-off, and then start working. • Before replacing parts, follow the instructions described in the troubleshooting. •...
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4 Unscrew the screws from the core guides (two PTT screws 4 × 12, indicated by ), and remove the core guides. Core guide 5 Remove the separators from the fan parts. 6 Disconnect the connectors for the motor lead wire. Separator 7 Unscrew the screws* (indicated by ) from the mo- Motor fix plate...
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9 Unscrew the screws (two screws, indicated by ) to Reinforcement remove the reinforcement. 0 Unfasten the cord clips (two clips, indicated by ) to release the motor lead wire. When the motor lead wire is sealed as shown in the picture below 9 Unscrew the screws (two screws, indicated by ) to Peel the sealing material.
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( 3 ) Damper Motor Section Motor cover 1 Unscrew the screws* (indicated by ) from the mo- tor cover. *GUF-50 types: two PTT screws 4 × 6 GUF-100 types: two PTT screws 4 × 8 2 Take the damper motor out of the cover. Damper motor ( 4 ) Circuit Board Section 1 Unscrew the screws (four PT screws 4 ×...
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3 Remove all lead wires connected to the circuit board. 4 Take the circuit board out. Circuit board "HIGH" Note: The compatible circuit board, which is equipped with switches (SW4 and SW5), is used as a ser- vice part. Assembly precaution After replacing the circuit board, switches (SW4 and SW5, indicated by ) must be set to "HIGH".
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3 Remove the tubes from the humidifier elements Tube (elem). 4 Holding the hose bands indicated by [ 1 ] to [ 6 ] with your fingers, remove the tubes. Referring to the pro- Tube cedure 5 below, remove the tube at the rear while taking out the front humidifier elem.
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( 6 ) Solenoid Valve and Water Sensor Section Note: GUF-50/100RD types are not equipped with the solenoid valve and cover (SOLV). 1 Remove the H. elem. covers. → See (5) 1 to 2. Cover (left) Cover (center) Cover (right) 2 Unscrew the screws (eleven PTT screws 5 ×...
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Water sensor and solenoid valve installation positions Connector for Connector for 6 Disconnect the connectors for the solenoid valve the solenoid valve the water sensor lead wires and water sensor lead wires. 7 Remove the pipe connected to the solenoid valve. *The heat exchanger is exceptionally removed for easy understanding.
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0 Unscrew the screws (two PTT screws 4 × 8, indi- *The heat exchanger is exceptionally removed for easy understanding. cated by ) to remove the water sensor. Water sensor ( 7 ) Heat Exchanger Section 1 Remove the covers (left, center, and right) and the H. elem.
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5 Hold the water stop (resin) with your fingers, and hold the lead wires by the fix piece (removed as shown in ( 7 ) 3). Hook the fix piece on the slit of the heat exchanger. Tighten the screws (two PTT screws 4 x 8, indicated by ), and secure the heat exchanger to the unit.
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8 Tighten the screws (four PTT screws 5 × 10, indi- Cover (left) cated by ) to attach the cover (left). 9 Attach the H. elem. cover (inside). H. elem. cover ( inside ) 0 Tighten the screws (Seven PTT screws 5 x 10, indi- H.
9. Parts catalog Please note the following when using the parts catalog. 1. When ordering parts, always indicate the part number, part name, and the number of parts required. 2. Parts are not always available, and it may take time for you to receive them. 3.
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GUF-50RD4 Critical Q'ty Name of part Parts No. Remarks pcs/unit safety 73 PTT screw 4×6 H00 312 007 76 Special bush R50 054 225 77 Rod R50 232 150 78 Pull spring R50 069 156 79 Damper support R50 472 716 80 Damper R50 472 715 81 Special bush...
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GUF-50RDH4 Critical Q'ty Name of part Parts No. Remarks pcs/unit safety 83 PTT screw 4×6 H00 312 007 86 Special bush R50 054 225 87 Rod R50 232 150 88 Pull spring R50 069 156 89 Damper support R50 472 716 90 Damper R50 472 715 91 Special bush...
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GUF-100RD4 Critical Q'ty Name of part Parts No. Remarks pcs/unit safety 75 Special bush R50 054 225 76 Rod R50 265 150 77 Pull spring R50 074 156 78 Damper support R50 473 715 79 Damper R50 473 716 80 Special bush M31 234 089 81 Thermistor Y55 012 213...
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GUF-100RDH4 Critical Q'ty Name of part Parts No. Remarks pcs/unit safety 95 Special bush R50 054 225 96 Rod R50 265 150 97 Pull spring R50 074 156 98 Damper support R50 473 715 99 Damper R50 473 716 100 Special bush M31 234 089 101 Thermistor Y55 012 213...
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GUF-100RDH4-60 Critical Q'ty Name of part Parts No. Remarks pcs/unit safety 95 Special bush R50 054 225 96 Rod R50 265 150 97 Pull spring R50 074 156 98 Damper support R50 473 715 99 Damper R50 473 716 100 Special bush M31 234 089 101 Thermistor Y55 012 213...
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Related Links Model Number: GUF-100RD4 GUF-100RD4 Specification GUF-50-100RD4 Declaration of Conformity GUF-50-100RD4 Installation Manual (1301875HF8601) GUF-50-100RD4 Instruction Book (1301875HF8501) GUF-50-100RD4 Service Manual (U189-A) GUF-50/100RD4 (CM) Product Information Sheet GUF-50/100RD4 (V) Product Information Sheet...