Operating instructions

69
Operation
Operation:
Troubleshooting guide
Troubleshooting guide.
Problem
number
Problem Possible cause Action
33
34
Humidity above set
point (cont.)
Hunting
(humidity swings
above and below
desired set point)
 Malfunctioning
controls
 Malfunctioning
control system
 Air volume is varying
rapidly.
 Air temperature is
varying rapidly.
 Check for incorrect supply voltage.
 Check for incorrect control signal.
 Check for improper wiring hookup.
 If humidity controller or transmitter are
out of calibration or malfunctioning,
repair or recalibrate.
 If zone valve end switch is not opening,
repair or replace.
 Check if SSR shorted. Repair or
replace as needed.
 If there is a faulty or inaccurate
humidity controller or transmitter,
repair or replace.
 Check for proper VAPOR-LOGIC
®
3
control settings: RH set point, HL set
point, cycle rate, PID tuning, etc.
 Relocate poorly located control
components. See humidity control
placement information on Pages 16-23
for recommendations.
 If inappropriate control components are
being used, change components.
 On SSR units: Control wire and power
wires must be physically separated
from each other. If they are not, an
induced control voltage may occur,
causing erratic operation.
 Verify that 6-wire modular cable is
isolated from power wiring.
 Stabilize.
 Stabilize to ±1°F.
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