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8.4.2 Temperature issues
Temperature issues
Issue
Diagnosis
Fix
Low heat
Operating temperature too
low. Increase temperature
target.
Increase temperature target.
Priority parameters or load
configuration improperly set
up.
Review load configuration parameters.
appliance undersized.
Refer to Load Calculation vs. Boiler
Output.
Air trapped within system.
Bleed system as required.
Improper system piping.
Refer to recommended piping guidelines
for the respective boiler model.
System pump undersized.
Check pump manufacturer’s data/check
temp differential across heat exchanger.
Poor gas:air mixing.
Check CO
2
level.
Defective thermostat.
Refer to manufacturer’s instructions.
Obstruction in condensate
drain.
Inspect and clean condensate drain.
appliance cycling on
operating/ safety controls.
Check operation with
Ohmmeter/Voltmeter.
System radiation undersized.
Check manufacturer’s rating tables for
capacity per foot.
Temperature
exceeds 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.
116
Section: Troubleshooting
Summary of Contents for EX Series
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Page 121: ...Appendices Wiring diagrams Figure 73 Controller electrical diagram 119 Appendices...
Page 122: ...Figure 74 Internal wiring diagram EX 400 and EX 500 models 120 Section Appendices...
Page 123: ...Figure 75 Internal wiring diagram EX 700 and EX 850 models 121 Wiring diagrams...
Page 124: ...Figure 76 Sequence of Operation 122 Section Appendices...
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Page 128: ...126 Boiler parts diagram EX 400 and EX 500...