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Feed from external thermostat sensor

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In some applications it is required to use a third party temperature sensor for the HVAC indoor unit's operational control. 
 
A common example is when having a home automation thermostat with a temperature sensor that the integrator would like to feed the unit for control as room temperature instead of the built in return air temperature sensor. 
 
Most VRF systems don't support this feed feature through their main VRF central control communication line. The only VRF manufacturer that allows this is Mitsubishi Electric - for which the CoolMaster product line can "feed" readings into each of the connected Mitsubishi indoor units. 

For others, please see the options below:
 
CoolMaster with a Mitsubishi Electric VRF system - feed instructions
Please follow the steps below to configure:
  1. Set the indoor's dip switch 1 in SW1 to the ON position. 
  2. Power cycle the indoor unit to apply the change.
  3. To verify that the indoor unit accepts the command send 'feed' command directly from CM5 to the Indoor. (terminal command) 
    For example: feed L1.001 25. 
    If you get "Feed Disabled" response, then SW1-1 switch is not Enabled.
Other supported 'feed' devices
  1. Line type GRNS: 
    • Underfloor heating board (SMT-HOA) - In this case the feed will be set as the heating zone temperature.
  2. Line type UMM with GS538 scan:
    • Fan coil or heat pump controller GS538/9 will replace the return air sensor. 
  3. Any connected CoolPlug:
    • Needs a unit configuration to select the thermostat sensor as the room temperature setting instead of the return air sensor. This is done according to the manufacturer's instructions. See more info in the section below. 
'feed' command with CoolPlug devices

The feed command lets CooLinkHub suggest an Ambient Temperature value to a connected indoor unit. This is supported on select CoolPlug device types.

Syntax

feed [UID] [±]<TEMP>
feed [UID] <TEMP.d>

Description

Provides an Ambient Temperature suggestion for the given indoor unit(s). If <TEMP> is set to zero, CooLinkHub will stop suggesting an Ambient Temperature. The suggested value is not persistent — it resets to zero after a power reset of CooLinkHub.

It is not guaranteed that the Ambient Temperature reported by the indoor unit will match the suggested value sent with the feed command.

  • Form: feed [UID] [±]<TEMP>
    <TEMP> must be a decimal natural number. The command can work in relative or absolute mode. If a plus (+) or minus (-) sign precedes <TEMP>, the value is added to or subtracted from the current suggested Ambient Temperature. Otherwise, the Ambient Temperature is set directly to the given value.
  • Form: feed [UID] <TEMP.d>
    <TEMP.d> is a fractional number with 0.1 precision. A preceding + or - is not allowed in this form.

The deg setting (see the set command) determines whether Celsius or Fahrenheit is used for <TEMP> and <TEMP.d>. The examples below assume Celsius.

Supported CoolPlug Devices

CoolPlug Type Feed Support & Precision
CoolPlug ME 12 0.1°C
CoolPlug ME CN105 0.5°C
CoolPlug DK P1P2 0.01°C (Master only)
CoolPlug DK S21 Not supported
CoolPlug DKS 0.1°C
CoolPlug FJ 0.5°C
CoolPlug PN/SA/TO 1°C
CoolPlug CAP 1°C
CoolPlug MH 1°C
CoolPlug HT 0.5°C
CoolPlug GR 1°C
CoolPlug LG 0.5°C
CoolPlug MD XYE Not supported
CoolPlug MD X1X2/D1D2 0.5°C
CoolPlug SM 0.1°C

Examples

Suggest an Ambient Temperature of 23.5°C for indoor unit L2.102: 

>feed L2.102 23.5
OK

Decrease the suggested Ambient Temperature for all indoor units on line L2 by 2°C: 

>feed L2* -2
OK
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