Section 3 – SR-2 Software Description
FreshSet High Speed Modulation
Micro Rev
All
HMI Rev
All
Choices
Off or On
Factory Set
Off
Exceptions
Only appears if Modulation Control
= On.
Description
This feature turns High Speed
Modulation on or off. High Speed Modulation
provides precise modulation control with increased
air-flow and capacity under high cooling load
conditions. Air flow is increased by operating the
unit in high speed. The increased air flow reduces
the rise in the return air temperature above setpoint
under high cooling load conditions. The discharge
air temperature is controlled to the programmed floor
limit during high speed operation.
If this feature is On the unit will automatically enter
high speed operation under high load conditions.
The unit will automatically switch back to low speed
operation when conditions allow. High speed
operation only occurs when necessary to minimize
fuel consumption and high speed operating hours.
FreshSet High Speed Modulation Ceiling
Micro Rev
All
HMI Rev
All
Choices
2.0°F (1.0°C) to 10.0°F (5.5°C)
Factory Set
3.0°F (1.7°C)
Exceptions
Only appears if High Speed Mod-
ulation = On.
Description
This switch point determines the
number of degrees above setpoint the temperature
must rise before high speed modulation is allowed.
A lower setting will result in tighter control to setpoint
but increases high speed operation time. A higher
setting will result in looser temperature control but
reduces high speed operation time for additional fuel
savings.
When the temperature rises to the Modulation
C 2°F (-17°C) the unit will run in high speed
modulation until the temperature falls back to the
Modulation Ceiling.
For example, if the setpoint is 35°F (1.7°) and the
High Speed Modulation Ceiling is 3°F (1.7°C), the
Modulation Ceiling is 38°F (3.4°C). If the
temperature reaches 40°F (4.4°C) as determined by
a Modulation Ceiling of 38°F (3.4°C) + 2°F (1.0°C),
the unit will switch to high speed modulation. The
unit will run in high speed modulation until the
Modulation Ceiling of 38°F (3.4°C) is reached. The
unit will then switch back to low speed modulation.
3-39
31 January 2005
Summary of Contents for SR-2 SmartReefer2
Page 4: ......
Page 7: ...Tab goes here and the next page should be GREEN Section 1 Safety...
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Page 10: ...Section 1 SR 2 Safety Information 1 2 18 January 2005...
Page 14: ...Section 1 SR 2 Safety Information 1 6 18 January 2005...
Page 15: ...Tab goes here and the next page should be GREEN Section 2 Hardware Description...
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Page 48: ...Section 2 SR 2 Hardware Description 2 32 31 January 2005...
Page 49: ...Tab goes here and the next 2 pages should be GREEN Section 3 Software Description...
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Page 96: ...Section 3 SR 2 Software Description 3 46 31 January 2005...
Page 97: ...Tab goes here and the next page should be GREEN Section 4 Operation...
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Page 181: ...Tab goes here and the next 2 pages should be GREEN Section 5 Diagnostics...
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Page 266: ...Section 5 SR 2 Diagnostics 5 84 02 February 2005...
Page 267: ...Tab goes here and the next page should be GREEN Section 6 Service Procedures...
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Page 270: ...Section 6 SR 2 Service Procedure Index Page 2 01 February 2005...
Page 282: ...Section 6 SR 2 Service Procedure A01B Page 6 P41RA01B 31 January 2005...
Page 298: ...Section 6 SR 2 Service Procedure A02A Page 12 P41RA02A 02 February 2005...
Page 318: ...Section 6 SR 2 Service Procedure A03B Page 4 P41RA03B 30 January 2005...
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Page 410: ...Section 7 SR 2 Information 7 2 02 February 2005...
Page 419: ...Tab goes here and the next page should be GREEN Section 8 Schematics and Wiring Diagrams...
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Page 422: ...Section 8 SR 2 Drawings 8 2 01 February 2005...
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