DriSteem VAPOR-LOGIC Version 6 - Page 86

82
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Troubleshooting guide
Table 82-1:
Troubleshooting guide (continued)
Transmitter or humidistat issues
Issue Possible causes Actions
Alert:
Space RH signal out of range
When transmitter or humidistat alerts appear,
possible causes are:
• Open, shorted, or incorrect wiring
• Incorrect signal
• Ground loop
• Signal exceeds range limits. Correct input
signals are: 4-20 mA, or 0-16 VDC
• Check the Control Input Signal type in the Settings/Control
menu. The selected type must match the actual sensor
hardware.
• Check voltages at board terminal P11:
-- RH signal: 2-10 VDC.
-- Dew point signal: 2-10 VDC.
-- Demand signal: 0-16 VDC.
• Check voltages at board terminal P13:
-- Duct high limit signal: 0-21 VDC, 2-10 VDC.
• Check voltages at board terminal P14:
-- Auxiliary temp sensor or temperature compensation
sensor: 2-10 VDC.
• Check output on transmitter:
-- If there is no output, replace transmitter.
-- Verify output is 4-20 mA.
-- Calibrate transmitter or humidistat if necessary.
• Check 21 VDC voltage supply of the board at P11. If
voltage is low unplug all field wiring to see if the voltage
returns. Incorrect field wiring on other terminals can draw
down the voltage. If voltage does not return, replace the
Vapor-logic board.
• Isolation control board by others may not be compatible.
Consult DriSteem.
Alert:
Dew point signal out of range
Alert:
Demand signal out of range
Alert:
Duct RH signal out of range
Alert:
Aux temp sens out of range
Alert:
No SDU airflow
• SDU blower or airflow proving switch is
incorrectly wired
• Check SDU for proper wiring.
• SDU blower cover is off • Install cover.
• SDU blower motor is inoperable (SDU fan does
not start)
• Replace SDU blower.
• Breaker tripped • Reset breaker.
Water level control probe issues
Alert:
Check water probe
Alert:
Faulty water probe
• Incorrect installation • Verify proper wiring of probe system. Do not use shielded
(screened) wiring.
• Verify probe wiring is not routed with high voltage wiring.
• Verify wiring between control cabinet and humidifier does
not exceed the recommended 50' (15 m) limit.
(Remote mount cabinets only)
• Verify fill and drain plumbing was installed per the
instructions in the humidifier's manual.
• Verify piping from the humidifier to the dispersion assembly
is installed correctly, that there are no elbows or restrictions
in the piping, and that the length of the piping is not too
long. See instructions in the humidifier's manual.
• Verify there is a P-trap installed on the tank and/or that the
P-trap is not plugged.
• Verify that there is a machine ground between control
cabinet and humidifier tank.
• Dirty or oxidized probes • Clean probe, removing oxidation and/or minerals or
replace if needed.
• Drain tank water to below the probe; reset system and
restart.
• Deterioration of probe rod assembly • Replace probe rod assembly.
• Missing probe rod • Replace missing probe rod if possible; otherwise, replace
probe assembly.
TROUBLESHOOTING