Operating instructions

68
Operation
Operation:
Troubleshooting guide
Troubleshooting guide.
Problem
number
Problem Possible cause Action
32
33
Humidity below
desired level
(cont.)
Humidity above set
point
 Heating elements
not operating
 Humidity control
input type not the
same as
VAPOR-LOGIC
3
software
 High entering
relative humidity
 Unit oversized
 Reduced air flow
 Improperly located
humidistat or
humidity
transmitters
 If heaters are burned out, refer to
Problem #30 Heater burnout.
 Verify that humidistat is calling for
humidity.
 Check for control voltage if limit
controls (air flow proving switch, zone
valves, etc.) are not allowing unit to
operate.
 Check fuses and replace if they are
blown.
 Check if the (optional) heater over-
temperature has been tripped. Reset if
necessary.
 Check VAPOR-LOGIC
®
3
control board
connections J26, J27 and J28. Consult
DRI-STEEM.
 Dehumidify.
 Consult DRI-STEEM.
 Check fans, dampers, VAV systems,
etc.
 Relocate using guidelines established
in this manual (see Pages 16-23).
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