71
Operation
Operation:
Troubleshooting guide
Troubleshooting guide.
Problem
number
Problem
Possible cause
Action
(continued)
32
(continued)
Humidity below desired
level
No call for humidity
from humidistat or
from control and
high limit humidity
transmitters
Excessive outside air
volume
Heating elements not
operating
Humidity control
input type not the
same as
VAPOR-LOGIC
3
software
Low or no signal strength from
humidistat. Check for proper wiring.
Check humidity transmitters (4-20 mA
output).
Adjust set point if VAPOR-LOGIC
®
3
set
point is too low.
Verify proper operation of fans,
dampers, VAV systems, etc.
If heaters are burned out, refer to
Problem No. 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.
More on next page ...
VL3-IOM-0301-METRIC.pdf 75
11/19/2009 9:22:40 AM
Summary of Contents for Vapor-logic3
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