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Specifications
20
Demand Defrost
Demand defrost function initiates defrost when:
• Temperature difference between the return air sensor and
defrost (evaporator coil) sensor is too large for 90 minutes
• Temperature difference between the supply air sensors and
return air sensor is too large
Defrost Timer:
Chilled mode
Evaporator Coil Temperature must be below 5C (41 F) to activate
the defrost compressor hour timer.
There is an interval set for defrosting, however, the defrost timer is
built intelligent - it detects whether or not there is ice building up on
the coil. If there is no ice building up on the coil, it extends the
defrost interval, and if there is Ice building up earlier on the coil it
reduces the defrost interval. The maximum interval is 48 hours.
Frozen mode
Every 8 hours of compressor operation. Defrost interval increases 2
hours each timed defrost interval. Maximum time interval in Frozen
mode is 24 hours.
Reset to Base Time
Defrost timer resets if the unit is off more than 12 hours, setpoint is
changed more than 5 C (9 F) or PTI pretrip test occurs.
Defrost Termination:
Defrost (Coil) Sensor
Chilled mode:
Terminates defrost when coil sensor temperature
rises to 18 C (65 F).
Frozen mode:
Terminates defrost when coil sensor temperature
rises to 18 C (65 F).
Termination Timer
Terminates defrost after 90 minutes at 60 HZ operation if coil
sensor has not terminated defrost (120 minutes at 50 Hz operation)
Power Off
Turning Unit On/Off switch Off terminates defrost
Compressor Shutdown Protection
(Auto Reset):
Stops Compressor
148 C (298 F)
Allows Compressor Start
90 C (194 F)
Bulb Mode:
Evaporator Fan Speed Settings
Flow High:
High speed only
Flow Low:
Low speed only
Flow Cycle:
Fans will cycle between low and high speed every 60
minutes
Defrost Termination Temperature Setting
4 to 30 C (40 to 86 F)
Physical Specifications
Fresh Air Exchange Venting System
(Adjustable):
0 to 225 m
3
/hr (0 to 168 ft
3
/min.) @ 60 Hz
0 to 185 m
3
/hr (0 to 139 ft
3
/min.) @ 50 Hz
Evaporator Fan Blade Specifications:
:
Diameter
355 mm (14.0 in.)
Pitch
25°
Number of Fans
2
MP-4000 Controller Specifications (Continued)
Summary of Contents for 098203
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Page 3: ...MAGNUM TK 60275 4 MM Rev 3 08 15 Copyright 2012 Ingersoll Rand EMEIA Printed in Ireland...
Page 193: ...Refrigeration Maintenance 191 Figure 163 Filter Drier...
Page 200: ...Refrigeration Maintenance 198 Figure 169 Receiver Tank Figure 170 Water Cooled Condenser Tank...
Page 257: ...255 Schematic Diagram RELEASED 19 Sep 2013...
Page 258: ...256 Wiring Diagram Page 1 of 2 RELEASED 19 Sep 2013...
Page 259: ...257 Wiring Diagram Page 2 of 2 RELEASED 19 Sep 2013...
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