The PUG condensing units are cooling only models that are
designed specifically for use with Mitsubishi Electronics PK,
PC, and PL MR. SLIM indoor units of matching nominal
capacities. Models from 1.5 through 3.5 tons are available.
• QUALITY CONDENSER COILS - The coil is constructed of enhanced copper tube and aluminum fins.
• COIL PROTECTION - Coils are protected from damage by a polymer mesh applied between the coil face
and the PVC coated steel coil guard.
• PROTECTED COMPRESSOR - The compressor is
internally protected against high pressure and temperature. This is accomplished by the simultaneous operation of high and low pressure switches and a
temperature sensor that protects the compressor if
undesirable operating conditions occur. A liquid line filter-drier further protects the compressor.
• DURABLE FINISH - The cabinet is made of prepainted steel. The pre-treated flat galvanized steel provides a better paint to steel bond, which resists corrosion and rust creep. Special primer formulas and
matted desert sand finish insure less fading when
exposed to sunlight.
• LOWER INSTALLED COST - Installation time and
costs are reduced by easy power and control wiring
connections. Discharge line heat exchanger knockouts are provided, if required. The unit contains
enough refrigerant for matching indoor units and 25
feet of interconnecting piping. The small base dimension means less space is required on the ground or
roof.
• TOP DISCHARGE - The warm air from the top
mounted fan is blown up away from the structure and
any landscaping. This allows compact location on
multi-unit applications.
• ADVANCED CONTROL BOARD - Each unit is
equipped with an advanced electronic control board.
This board controls the function of the outdoor unit and
improves the operation and protection of the unit. The
control board also provides operational and diagnostic
information to the service technician through multiple
LED’s.
• LOW OPERATING SOUND LEVEL - The upward air
flow carries the normal operating noise up away from
the living area. The rigid top panel effectively isolates
any motor sound. Isolator mounted compressor and
the rippled fins of the condenser coil muffle the normal
fan motor and compressor operating sounds.
• LOW MAINTENANCE - Long life permanently lubri-
cated motor-bearings need no annual servicing.
• EASY SERVICE ACCESS - Fully exposed re fri g era n t
connections, a single panel covering the electrical controls and a plug in the control box connecting the condenser fan, make for easy servicing of the unit.
• SECURED SERVICE V ALVES - Secured reusabl e ser-
vice valves are provided on both the liquid and vapor
connections for ease of evacuating and charging.
• ETL LISTED - Approved for outdoor application.
• Certified in accordance with the Unitary Small Equipment certification program, which is based on ARI
Standard 210/240.
Unit TotalFull Load Amps10.112.615.217.421.4
Max. Fuse Size (Amps)2025303545
Min. Circuit Ampacity12.515.518.921.426.4
Max. Tubing Length7575757575
Max. Vertical Separation5050505050
Locked Rotor Amps54577382129
Full Load Amps9.612.114.716.020.0
Mitsubishi Electronics 20033
Page 4
036-21534-001 Rev. B (0703)
3
STANDARD OPERATING DATA
PK-FK INDOOR UNITS WITH PUG OUTDOOR UNITS
MODELSPK18FKPK24FKPK30FKPK36FK
ItemUnitCoolingCoolingCoolingCooling
VoltageV208/230208/230208/230208/230
FrequencyHz60606060
Total InputkW1.822.382.853.34
Indoor Fan CurrentA0.80.80.91.0
Booster Heater CurrentA-------Outdoor Fan Current (FLA)A0.50.50.51.4
VoltageV208/230208/230208/230208/230208/230
FrequencyHz6060606060
Total InputkW1.822.382.853.344.35
Indoor Fan CurrentA0.80.80.91.01.4
Booster Heater CurrentA---------Outdoor Fan Current (FLA)A0.50.50.51.41.4
VoltageV208/230208/230208/230208/230
FrequencyHz60606060
Total InputkW2.382.853.344.35
Indoor Fan CurrentA0.80.91.01.4
Booster Heater CurrentA-------Outdoor Fan Current (FLA)A0.50.51.41.4
The factory charge in the outdoor unit includes enough
charge for the unit and the smallest matched evaporator an d
25 feet of line. Some evaporator matches may require some
additional charge. See Tabular Data sheet provided in unit literature packet.
The “TOTAL SYSTEM CHARGE” must be permanently
stamped on the unit data plate.
Total system charge is determined as follows:
1.Determine outdoor unit charge for the selected evaporator from the corresponding table on Pages 4-6.
2.If using line length other than 25 feet, calculate the line
charge from the tables on Page 24.
NOTE: The line charge over 25 feet should be included on
the data plate and must be added to the system.
3.Total system charge = item 1 + item 2.
4.Permanently stamp the unit data plate with the total
amount of refrigerant in the system.
Use one of the following charging methods whenever additional refrigerant is required for the system charge.
MEASUREMENT METHOD
If a calibrated charging cylinder or accurate weighing device
is available, add refrigerant accordingly.
Compressor damage will occur if system is
improperly charged. On new system installations
charge system per R-22 charge information label
and follow guidelines in this instruction.
Check flare caps on service ports to be sure they
are leak tight. DO NOT OVER TIGHTEN
(between 40 and 60 inch - lbs. maximum).
SUPERHEAT CHARGING METHOD
NOTE: Use this method only during system maintenance
and repair.
1.Operate system until temperatures and pressures stabilize (minimum of 10 minutes).
2.Measure and record indoor wet bulb (WB) temperature
using a sling psychrometer and the outdoor dry bulb
(DB) temperature using a thermometer.
Refrigerant charging should only be carried out
by a qualified air conditioning contractor.
3.Measure and record the suction pressure at the suction
service valve port.
4.Using Table 1, note the superheat value correspondi ng
to the intersection of the indoor wet bulb and the outdoor
dry bulb.
5.With the superheat value obtained in step 4 and the suction pressure value from step 3, find the intersection of
the values in Table 2. This is the required suction tube
temperature at the suction service valve.
6.To bring the tube temperature in line with the required
value from Table 2, add refrigerant to the service port to
cause the tube temperature to fall and reclaim refrigerant
to cause the temperature to rise.
22Mitsubishi Electronics 2003
Page 23
7
OPERATING RANGE
036-21534-001 Rev. B (0703)
1.POWER SUPPL Y
1 Phase 60 Hz 208/230 V
Normal Voltage Range: 187 to 252
FUNCTION
Cooling
1. A low ambient accessory kit is required for operation below this temperature which extends cooling operation to 25°.
CONDITION
Standard Temperature80679775
Maximum Temperature9571120–
Minimum Temperature6757
Maximum Humidity80758075
AIR INTAKE
DB (°F)WB (°F)DB (°F)WB (°F)
(Rated in accordance with ARI Standard 110, utilization
range “A”.
1.COOLING/HEATING OPERATION
Outdoor unit operation is activated by delivery of a 12VDC signal from the indoor unit. Cooling o nly units have 2 low voltage
control wires from the indoor unit to the outdoor unit. The functions of these wires are:
• Wire #1: Common
• Wire #2: Initiates operation of the compressor and outdoor fan when 12VDC is supplied from the indoor unit.
2.OUTDOOR ABNORMALITY DETECTION BY INDOOR UNIT (P8 FAULT CODE)
A. The indoor unit constantly monitors the difference between return air temperature and indoor coil temperature. During
a call for cooling, if the indoor coil does not become at least nine degrees colder than the return air temperature after
approximately ten minutes of operation, the indoor circuit board will shut down the system. The indoor unit will display
the problem code “P8” at the indoor unit remote controller and terminate the 12VDC signal to the outdoor unit.
B. Th e “P8” code d oes not ne ce ssarily mean tha t the outdoor unit has a problem. It simply means that the indoor coil did
not become colder than the return air during a call for cooling.
C. If a “P8” code is displayed:
i. Turn the indoor remote controller off and back on to reset it.
ii. Set the remote controller to a “call” for cooling.
iii. At the indoor unit 12VDC control terminals, check to see if 12VDC is present on the #1 and #2 wires.
1. You may encounter a 3-minute delay in cooling before the 12VDC signal is generated or after the 12VDC signal
is delivered to the outdoor unit before the compressor contactor is energized.
iv.If 12VDC is present and the 3-minute delay has expired, the outdoor unit should be operating. If it is not, the indoor
unit is not the source of the problem and the following should be checked:
1. Check the 12VDC terminals at the outdoor unit for 12VDC. The pol arity must be the same as that o f the indoor.
That is, the control wires must be connected to matching numbered control terminations on the indoor and ou tdoor units (1 to 1, 2 to 2). If the wires are not connected properly, the unit will not be damaged, but it will not operate.
a. If no 12VDC signal is present when 12VDC is available at the indoor unit, check for a break/open in the control
wire.
b. If 12VDC is present, insure polarity is correct. If polarity is correct and a 12VDC sig nal is present, check the
LED indicators on the outdoor board.
i. Is the “Status” LED lit const antly? If so, the outdoor board is in time delay. Wait for it to expire (make sure the
12VDC signal is still available from the indoor unit).
ii. Is the “#2” LED lit? This indicates that the board is receiving 12VDC from the indoor unit.
NO LED: Recheck for 12VDC on the control wires, check for correct polarity and check the wires from the
terminal block to the board.
LED LIT: The board should be outputting 24 VAC to the compressor contactor and line voltage to the fan
(unless in low ambient control). Is the compressor/fan operating?
YES: System is OK
NO: Is the “Status LED” flashing?
NO: Bad outdoor board
YES: 2 Flash sequence indicates that the High Pressure Switch is open. 4 Flash sequence indicates that the
Low Pressure Safety Switch is open
3.OUTDOOR BOARD FUNCTIONALITY
A. High Pressure Safety Switch (HPSS). This switch opens at approximately 400 PSIG and closes at approximately
300 PSIG. There is no bypass on this switch. When the switch op ens, the control immediately stops the compressor
and outdoor fan. When the switch closes, the system can restart if the indoor unit has not entered a P8 fault code. If
the switch opens three times within a one-hour period, the out door unit operation is “locked out” and must be serviced.
Turning line voltage off and back on to the outdoor unit will reset the lockout. The indoor unit must also be reset to clear
the fault code. Turning the remote controller off and back on will reset the indoor unit.
B. Low Pressure Safety Switch (LPS). This switch opens at approximately 7 PSI and closes at approximately 22 PSI.
The switch is bypassed during the first 3 minutes of cooling operation. If the pr essure rises to the “cut in” point, the
compressor will restart if the delay has expired and the indoor unit is not in a P8 fault. If the switch opens 3 times within
a one-hour period, the outdoor unit will be “locked out” and must be serviced . Turning line voltage off and back on to
the outdoor unit will reset the lockout.
26Mitsubishi Electronics 2003
Page 27
036-21534-001 Rev. B (0703)
MICROPROCESSOR CONTROL10
C. Low Ambient Temperature Switch (LATS). Th e purpose of this switch is to extend cooling operation in low outdoor
temperatures as low as 25°. The outdoor unit uses a high side pressure switch to cycle the fan. When pressure drops
to 165 PSI (+/-10), the switch opens and the fan stops. When pressure rises to 300 (+/- 10), the switch closes and the
fan restarts. A jumper is factory installed in place of the low ambient pressure switch. This jumper must be remo ved
when a low ambient accessory kit is in stalled.
During low ambient cooling operation the indoor unit may initiate an “air defrost” of the indoor coil once during every 16
minutes of continuous cooling operation. This insures that the coil has adequate airflow and should not be considered
as a fault.
D. Crankcase Heater (CCH) - A crankcase heater is installed into all PUG condensing units to protect the compressor
when operating under low ambient conditions. W hen line voltage is first applied to the outdoor unit, the control will
energize the crankcase heater. The control will continue to energize the CCH until the first call for compressor operation. The control never energizes the CCH during compressor opera tion. The con trol will ene rgize the CCH thirty minutes after the compressor turns off. It will then cycle the CCH on for 30 minutes and off for 30 minutes repeatedly until
the compressor is again turned on.
E. Compressor Contactor (CC) - The compressor contactor is energized with 24VAC when a 12 VDC is input to the out-
door unit on control wires 1 and 2 from the indoor unit. This 12 VDC signal is generated and sent from the indoor unit
on all calls for compressor operation.
F.Outdoor Fan Motor (ODF) - The outdoor fan motor typically operates at the same time as the compressor. Howe ver,
the fan may be off while the compressor is operating during low ambient cooling conditions as described previously.
G.Transformer Input (24VAC) - The secondary side of the transformer supplies 24 volts AC to the circuit board on the
“24VAC” terminals. This voltage operates the internal circuits of the board and also provides voltage to the compressor
contactor when appropriate. The primary side of the transformer is powered with line voltage from terminals marked
“L1” and “L2” on the board.
H. Line V oltage - Line voltage is input and output from the circuit board on the terminals marked “L1” and “L2”. There are
four terminals marked “L1”. These terminals provide “L1” input to the board and “L1” output to the transformer, crankcase heater and the outdoor fan motor.
There are two terminals marked “L2”. One terminal provides “L2” line voltage input to the board. The other provides
“L2” output to the transformer.
I.Anti-Recycle Delay Timer - The control provides an “anti-recycle delay” of three minutes in the cooling mode.
J.Time Shortening - Placing the defrost jumper to the “TEST” position shortens timings of the control to the following
values.
1. Anti-Recycle - 36 seconds
2. CCH Cycles - 24 seconds
3. Compressor Run - 1 second
4. Low Pressure Bypass - 12 seconds
K. Last Fault Memory Recall. The control maintains a memory of the last fault that occurred. The last fault code can be
recalled by moving the defrost jumper to the “TEST” positio n and observing the “STATUS” LED display. The control
stores only the last fault code. The control will reset the fault code memory when the line voltage to the outdoor unit is
turned off.
L.LED Function. The board has four LED’s which provide the following function:
1. “STATUS” LED indicate s normal operation or faults as follows:
LED FLASHESINDICATION OF CONDITION
OffNormal Operation, no fault, no “call”
Constant on LED
1 Flash SequenceDefrost Sensor Closed
2 Flash SequenceHigh Pressure Safety Switch Open
3 Flash SequenceLATS Open
4 Flash SequenceLow Pressure Safety Switch Open
2.“CCH” LED indicates that the crankcase heater is energized.
3.“2” LED indicates that the indoor unit is calling for compressor operation, 12VDC is present on control wire #2.
Mitsubishi Electronics 200327
Anti-recycle delay active. If the HPSS or LPS opens, the anti-recycle
will activate for 3 minutes before the fault can be displayed.
Page 28
036-21534-001 Rev. B (0703)
ELECTRICAL11
FIGURE 1: Wiring Diagram
28Mitsubishi Electronics 2003
Page 29
036-21534-001 Rev. B (0703)
REFRIGERANT SYSTEM12
SERVICE PORTS
There are two service ports available to service technicians. One port is located at each of the two base valves.
A. Liquid Line Base Valve Service Port. This port is used to evacuate the refrigerant line set when the ball valve is in
the closed position. It may also be used to measure the liquid line pressure or, more accurately, the “saturated line”
pressure during normal operation. During cooling operation this servi ce port is downstream of the metering orifice
which is installed inside of the liquid line base valve body. While in the cooling mode this pressure is typically 25 to 40
PSI above that of the suction base valve pressure (usually 85 to 110 PSI).
B. Suction Base Valve Service Port. This port is also used to evacuate the indoor unit and line set during installation.
The ball valve must be closed to evacuate the line set and indoor unit. During normal cooling mode operation this pres-
sure port indicates evaporator pressure (minus line set pressure drop). Typical cooling mode pressure readings here
are in the range of 55 to 80 PSI during summer operation.
C. Both refrigerant lines must be insulated because th e “cooling side” metering device is loc ated in the ou tdoor
unit. Failure to insulate the liquid line, or more accurately the “saturation line”, will result in condensa te dripping from
the line and poor cooling performance.
D. Metering Devices. A fixed orifice that is located in the liquid base valve meters refrigerant in the cooling mode. If a
restriction or a compressor failure occurs this orifice can be easily accessed and cleaned after refrigerant is recovered.
It is important to use a back-up wrench on the liquid line base valve connections when accessing the orifice. Failure to
do so could loosen the base valve connections and cause a refrigerant leak.
21Kit, Motor Mounting (Acorn Nut)363-90117-700363-90117-700
22*Wiring Diagram035-15861-501035-15861-501
23*Harness, Compressor025-31883-000025-31884-000
24Hubcap026-39292-000026-39292-000
25High Pressure Switch025-33305-048025-33305-048
26Low Pressure Switch025-38610-000025-38610-000
27Accumulator Tank026-34089-000026-34090-000
28Transformer025-18452-000025-18452-000
29Control Board031-01976-000031-01976-000
30Terminal Block025-38589-002025-38589-002
Fan Guard (18”)
Fan Guard (22”)
Fan Blade 18” Diameter
Fan Blade 22” Diameter
Compressor Mount (4 Req’d)
Dual Capacitor (45/5 MFD)
Dual Capacitor (35/5 MFD)
Base Valve 1/2” (.071 orifice)
Base Valve 1/2” (.080 orifice)
026-35511-018
---
026-34092-000
---
015-03560-001
(H29B33UABCA)
9435-1081
---
024-25895-000
---
022-09047-005
---
---
026-35511-022
---
026-34593-000
015-02092-005
(H23A423ABCA)
9435-1081
---
---
024-25859-000
---
022-09047-006
<
<
NOTE
*Not Shown
:
New replacement parts shown in bold face type at the first printing of parts list dated 4/
03.
Major components and suggested stocking items are shown with shaded item number.
“<“ Across from row indicates a change in that row.
--- Not applicable to specified model.
32Mitsubishi Electronics 2003
Page 33
036-21534-001 Rev. B (0703)
14
NOTES
Electrical Accessories
Part No.DescriptionUsed With
2LA08700324
TO ORDER AUTHORIZED FACTORY REPLACEMENT PARTS - Contact your local Mitsubishi Electric distributor. or visi t our
website at www.mrslim.com for a Distributor and Dealer listing.
Low Ambient Kit
(extends cooling operation to 25°)
All PUG Models
Mitsubishi Electronics 200333
Page 34
14NOTES
Mitsubishi Electronics 2003036-21534-001 Rev. B (0703)