11.2.1 Temperature issues
Temperature issues
Issue Diagnosis Fix
Low heat Operating
temperature too
low.
Increase temperature target.
Load configuration
improperly set up.
Review load configuration parameters.
Hydronic Heat
Pump undersized.
Compare heat load calculation to maximum
unit output.
Air trapped within
system.
Bleed system as required.
Improper system
piping.
Refer to recommended piping guidelines for
the respective model.
System pump
undersized.
Check pump manufacturer’s data / check
temp differential across heat exchanger.
Defective
thermostat.
Refer to manufacturer’s instructions.
Cycling on
operating / safety
controls.
Check operation with ohmmeter / voltmeter.
System radiation
undersized.
Check manufacturer’s rating tables for
capacity per foot.
Temperature exceeds
mercury thermostat setting
Incorrect anticipator
setting.
Check with ammeter.
Thermostat not
level.
Check level.
One or more zones do not
heat properly
Air trapped within
zone(s) piping
Vent system / zone as required.
Low radiation/
excessive heat loss.
Check actual length of pipe using radiation /
heat loss calculation.
Low flow rate to
zone(s).
Check temperature drop across zone.
Defective zone
valve/ zone
circulator.
Check operation per manufacturer’s
instructions.
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