LG Multi V Water IV - Pre-Commissioning: Indoor Unit Temperature Sensing and Air Balance; Indoor Unit Temperature Sensing Location Selection; Air Balance for Ducted Indoor Units

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Pre-commissioning and Maintenance
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Indoor Unit Temperature Sensing Location Selection
For each indoor unit connected to a wired zone controller, select a zone temperature sensing option. Assign one of three methods for the
indoor unit to sense the zone temperature. Skip this step for indoor units controlled from a handheld (wireless) controller. Record the sensing
for each indoor unit on the Pre-commissioning Device Configuration Worksheet. There are three possible strategies:
1. Use the unit-mounted return air sensor (or the optional remote wall-mounted sensor). When outdoor air is ducted to an indoor unit, the
return air sensor cannot be used to control the indoor unit. Use a wall-mounted thermostat or remote temperature sensor instead of the
unit-mounted return air sensor.
2. Use the sensor mounted in the zone controller.
3. Sense the temperature at the unit-mounted return air sensor (or the optional remote wall-mounted sensor) and sensor mounted in the
zone controller, then control based on the temperature reading using the sensor that is farthest from set-point.
Indoor Unit Temperature Sensing Strategy/Air Balance
Conduct an Air Balance for Ducted Indoor Units
For each ducted model indoor unit, confirm that the Test and Balance contractor adjusted the fan speed setting values. Recorded the actual
fan setting value used to deliver cataloged CFMs at the jobsite static pressure conditions in the appropriate column on the Pre-Commission-
ing Device Configuration Worksheet. If the fan setting value was left at the factory default insert “00” in the blank.
It is always best if the air balance is completed prior to a request for a commissioning agent. If the air
balancing contractor has not completed the work before commissioning, the Commissioning Agent is not
responsible for setting the indoor unit air ow rates, fan speed, or insure the air volume delivered at each
indoor unit is per project specications, only to spot check. Excessive or restricted airow may impact the
ability of the Commissioning Agent to successfully complete system commissioning. If problem exists, re-
quest verication from the Test and Balance contractor. If necessary, provide instruction to the air balance
technician on how to adjust the indoor unit fan setting value.
Note:
PRE-COMMISSIONING