Results 1 to 3 of 3
  1. #1
    Join Date
    Nov 2007
    Location
    Syracuse New York
    Posts
    38

    Thermo king optiset part 2 0f 2

    Mode Selection
    Operating modes may be customized to meet specific product requirements. Different combinations may be assigned to as many as 10 setpoint ranges. When making mode and range selections you will try to satisfy your customer’s desired level of temperature control, product quality and fuel economy.

    Frozen Range Example
    In the Range Selection Example above, range 0 is a –20 F to 0 F range. Your customer might transport frozen beef in that range. What settings could you use to protect the beef while efficiently using the unit?

    1. Economy should be selected YES. We want to save fuel if possible.

    2. CYCLE SENTRY should be selected YES. Frozen beef does not require continuous airflow. You gain fuel economy.

    3. Continuous should be selected NO. Frozen loads do not need continuous airflow.

    4. NLRS (Null Range Setting) will be on because Economy is selected yes. The default setting is 10. This means that the unit will not restart until the box temperature rises to 10 F above setpoint. The beef is already frozen. An extra 5 F of temperature rise above normal will not harm the product but will allow the engine to stay off longer, saving fuel.

    5. FSII (Fuel Saver) should be YES. When the unit does start, it will run in low speed for 8 minutes. Box temperature may get back within range during that time. If so, we save fuel. If not, it now goes to high speed to control the temperature.

    6. HSPD (High Speed Pull-down) should be NO. The effect of high speed pull-down to setpoint is not clear.

    7. MNTL (Maximum Null Time Limit) could be OFF, 20, 40, 60 or 80 minutes. If yes, the unit would start up just to circulate air. Not needed for frozen loads.

    8. MOTL (Minimum Off Time Limit) could be OFF, 15, 30 or 60 minutes. A lower setpoint could allow a higher setting. The unit will not be allowed to start for a minimum number of minutes. It takes some time for frozen product to begin changing temperature. This will help to keep the unit off as much as possible, saving fuel.

    9. Modulation will be disabled because the setpoint is in the frozen range.


    Fresh Range Example
    In the Range Selection Example above, look at range 2. This is a fresh range from 25 F to 45 F. Your customer might be transporting fresh vegetables. What could the settings be?

    1. Economy should be selected YES. We want to save fuel if possible.

    2. C/S should be selected NO. Produce requires continuous are flow.

    3. Continuous should be YES. Produce loads do need continuous airflow to deal with the heat of respiration. You loose fuel economy but gain more consistent temperature through out the trailer.

    4. NLRS (Null Range Setting) will be deactivated in continuous run mode.

    5. FSII (Fuel Saver) should be YES. When the box temperature rises into the high speed range, it will continue to run in low speed for an additional 8 minutes. Box temperature may get back within range during that time. If so, we save fuel. If not, it now goes to high speed to control the temperature.

    6. LSSP (Low Speed Switch Point) default setting is 5. If the product is very temperature sensitive this setting could be reduced to 3. You would loose fuel economy but gain temperature control. If the product is less temperature sensitive this setting could be increased. You would gain fuel economy but loose temperature control.

    7. HSPD (High Speed Pull-down) should be NO. The effect of high speed pull-down to setpoint is not clear.

    8. MNTL (Maximum Null Time Limit) will be deactivated in continuous run mode.

    9. MOTL (Minimum Off Time Limit) will be deactivated in continuous run mode.

    10. Modulation should be selected for RETA (return air control, normal). Top freeze and dehydration are reduced or eliminated. DISA (discharge air control) should be selected if the product is very temperature sensitive.

    Work with the OptiSet™ Setup Guide program to practice building custom setups. You may use the OptiSet Guidelines to help choose the best settings for certain products. The Setup Guide program and Guidelines can be found on the “New Solutions for the Cold War” CD.


    Additional Mode Settings

    CYCLE-SENTRY
    The CYCLE-SENTRY mode can be programmed to:

    1. YES, the unit will auto start and cycle off at setpoint.

    2. NO, the unit will auto start but not cycle off at setpoint.

    3. Select from mode key. Driver can choose CYCLES YES or NO from the mode key. Only available if both C/S and continuous are programmed YES.

    4. Cannot have both C/S and continuous programmed NO.

    Continuous
    The continuous mode can be programmed to:

    1. YES, the unit will auto start but not cycle off at setpoint.

    2. NO, the unit will auto start and cycle off at setpoint.

    3. Select from mode key. Driver can choose CYCLES YES or NO from the mode key. Only available if both C/S and continuous are programmed YES.

    4. Cannot have both C/S and continuous programmed NO.

    Modulation
    The modulation mode can be programmed to:

    1. RETA, unit will control refrigeration capacity near setpoint based on return air temperature.

    2. DISA, unit will control refrigeration capacity near setpoint based on discharge air temperature.

    3. OFF, modulation is disabled and unit will run in normal continuous run.

    4. Modulation is not selectable from the mode key. Only available during continuous run with a setpoint in the fresh range.

    regards R-T
    "Keep it simple"

  2. #2
    Join Date
    Mar 2006
    Location
    south jersey
    Posts
    454

    Thumbs up

    Reefer -Tek great info. Thanks Jim !!
    Would the last person to leave NJ please put out the lights

  3. #3
    Join Date
    Nov 2007
    Location
    Syracuse New York
    Posts
    38
    Quote Originally Posted by james264 View Post
    Reefer -Tek great info. Thanks Jim !!
    hey all in a days work, glad you like

    Regards R-T
    "Keep it simple"

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event