Mitsubishi Mr. Slim PCH24EK- User Manual
Mitsubishi Mr. Slim PCH24EK– User Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.
Table of Contents:
- Page 2 – MICROPROCESSOR CONTROL; OUTLINE OF MICROPROCESSOR CONTROL; OUTPUT to outdoor unit; Remote controller
- Page 3 – Remote controller operation buttons; FILTER button; FAN SPEED button
- Page 4 – Caution; Remote controller display
- Page 5 – REFRIGERANT SYSTEM DIAGRAM; Outdoor unit
- Page 6 – start until this period has ended.; INDOOR UNIT CONTROL; Press MODE button to set operation mode to Cool.; NOTE : Set temperature changes by 2 ̊F in the range 65~87 ̊F, each
- Page 8 – Changes by pressing the AIR DISCHARGE button.
- Page 9 – (4) Detecting abnormalities in the outdoor unit; RANGE A
- Page 10 – TROUBLESHOOTING; TROUBLE IN TEST RUN
- Page 13 – Protection function is working.; OTHER TROUBLES AND CAUSES; “CENTRALLY CONTROLLED” is displayed.
- Page 14 – HOW TO CHECK THE PARTS; Opening and closing temperature of protector.
- Page 15 – CEILING CASSETTE
- Page 16 – How to check the parts; Thermistor R; PC MODELS: CEILING SUSPENDED INDOOR UNITS
- Page 17 – OUTDOOR MICROPROCESSOR CONTROL; Protection function
- Page 18 – Function of switches on the outdoor controller board
- Page 20 – mode the indication changes to output state indication.
- Page 22 – WRONG WIRING ON SITE; -1 Between remote controller and indoor unit; OUTDOOR UNIT
July 7, 2005
Mitsubishi Electric ‘Mr. Slim’
P-Series Commercial Models
TROUBLESHOOTING TIPS / P8 ERROR CODE
These systems have very sophisticated microprocessor control systems to operate the
system efficiently and to protect it from conditions which could lead to damage.
If the P8 Error Code appears on the wall controller this indicates a problem with the
condensing (outdoor) unit. There are several possible causes for this fault. A few are
mentioned in the literature provided by Mitsubishi, but experience has shown that
many other conditions can also result in the P8 Error Code.
1. Is there power to the outdoor unit? P-series indoor and outdoor units are
typically wired from separate sources. On cooling only units the indoor section
is 120/1/60 volt and the outdoor section is 208-230/1/60 volt. On heat pumps
both sections are 208-230/1/60 volt. The indoor unit could have power to it but
not the outdoor unit, resulting in a P8 fault.
2. Is the 2-wire 12 VDC communication link between the indoor unit and outdoor
unit intact? This wiring is polarity sensitive so if the wires are crossed, shorted
or broken this is also a problem to look for. Ensure the wires are secure in the
terminals as well. Loose wiring can cause intermittent problems.
3. There is a 208 Volt jumper for the outdoor unit control board. Verify your
power supply voltage and insure this jumper is correct for what you actually
measure at the unit with your meter. The outdoor board monitors the power.
4. The outdoor board monitors the temperature of the refrigerant leaving the
condenser coil and modulates it’s condenser fan(s) to try and maintain a 95°F
temperature. If the discharge temperature gets too high, or too low, the unit
will shut off. Verify that the pipe temperature thermistor is not open or
shorted, and that it is snug in the well attached to the refrigerant pipe.
5. Is the condenser fan operating? On the extra low ambient models (-40°F) there
is a control to disable the condenser fan(s) during very cold weather. If this
control is defective it may be preventing operation of the fan(s) in warm
weather. Ensure the condenser fan is ramping up to full speed when required.
6. Is the unit operating year-round but not a -40°F low ambient design? You can
determine this easily because the accumulator on -40°F units is heated and
insulated. Ensure the accumulator heater is functioning in the winter.
7. Is the system undercharged, or overcharged? It is a capillary tube metering
device so the refrigerant charge is critical. P-series units have an accumulator
which enables it to store enough refrigerant for up to a 100’ line set. After 100’
additional refrigerant must be weighed in based on the total 1-way lineset
length.
Please refer to the attached pages from the Service Manual for more information on
troubleshooting.
Email: [email protected]
Web: www.digelair.com
21 Grenfell Crescent, Suite 1
Ottawa, Ontario K2G 0G3
Phone: 613-723-0359
Fax: 613-226-4892, Toll Free: 1-888-279-2505
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Summary
OC274-26 10 MICROPROCESSOR CONTROL ● Compressor and outdoor fan : ON-OFF 1. OUTLINE OF MICROPROCESSOR CONTROL ● OFF-ON switching. ● COOL/DRY-FAN selector switching. ● Thermostat setting. ● TIMER mode selector-switching and Timer setting. ● HIGH-LOW fan speed switching. ● AUTO Vane selector (AIR DISC...
OC278-5 Remote controller operation buttons TIMER OFF TIMER CHECK SET TEMP. DRY COOL FAN CLOCK AUTO AUTO START STOP MODE TIMER ON/OFF CLOCK/TIMER FAN SPEED AIR DISCHARGE FILTER CHECK TEST RUN AIR SWEEP SET TEMP. TIMER SET F FANSPEED REMOTE CONTROLLER FILTER button This resets the filter service indi...
OC278-6 TIMER OFF TIMER CHECK SET TEMP. DRY COOL FAN CLOCK AUTO AUTO START STOP MODE TIMER ON/OFF CLOCK/TIMER FAN SPEED AIR DISCHARGE FILTER CHECK TEST RUN AIR SWEEP SET TEMP. TIMER SET F FANSPEED REMOTE CONTROLLER Operation lamp This lamp lights during operation,goes off when the unit stops andflas...
