95
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Troubleshooting guide
Table 95-1:
Troubleshooting guide (continued)
Filling issues
Issue
Possible causes
Actions
Alarm:
Excessive fill time
Alarm:
Excessive refill time
Tank is not full .
• Fill and drain valve wiring reversed
• Correct wiring .
• Low water supply pressure
• Verify water pressure is 25 psi (552 kPa) minimum .
• In-line strainer plugged
• Clean as needed .
• Humidifier cover interlock switch improperly
wired
• Correct wiring .
• Fill valve not open
• If 24 VAC is present across fill valve coil, replace valve .
• Fill valve not wired properly to control board
• Verify proper fill valve wiring at terminal P17 (fill, drain) .
• Test operation by going to the Test section under the Diagnostics
menu .
• Inlet water needle valve closed or plugged
• Check if needle valve is open and free of sediment .
• Fill valve with incorrect operating voltage
• Verify valve coil is 24 VAC .
• Plugged fill valve
• Remove fill valve and check for foreign material plugging the valve .
• Fill valve installed backward
• Check arrow direction on valve; or ”In” should be visible on fill
valve body .
• Excessive water hammer can bend a needle
valve and make it difficult to open
• Replace valve, if needed .
• Install a water supply line shock arrester .
• Orifice after fill valve may be plugged
• Service valve strainer and orifice assembly .
• Drain valve leaking water
• Verify drain is in the Auto position and is closed .
• Missing probe rod
• Replace missing probe rod if possible; otherwise, replace probe
rod assembly .
Tank is full .
• Probe malfunctioning
• Clean or replace probe .
Low water conductivity:
• Tap/softened water GTS humidifiers and electric
humidifiers with heating elements require fill
water conductivity to be 30 µS/cm minimum .
• XT humidifier recommended fill water conductivity
is 350 to 1250 μS/cm .
• Add add ¼-½ tab sodium bicarbonate (i .e ., Alka Seltzer) to
increase water conductivity . Consult DriSteem for further advice .
• No tank ground
• Install tank ground .
• Fill valve stuck open
• Check valve for foreign matter .
• Fill valve installed backward
• Check arrow direction on valve; or ”In” should be visible on fill
valve body .
• Excessive condensate is draining into the tank
• Consult DriSteem to increase the amount of water that can be
converted to steam before receiving a fault .
Fill valve cycles on and
off frequently (several
times per minute)
For XT humidifiers, see
Check cylinder / high water
on Page 47 of Table 45-1 .
• Malfunctioning level control system
• If needed, clean probes .
• Check water conductivity . Minimum conductivity for proper
operation of level control system is 30 µS/cm .
• Verify that probe wiring is correct .
• Drain valve not fully closed
• If an obstruction does not allow drain valve to fully close, clean
valve .
• If there is a broken or weak return spring on drain valve, replace
the valve .
• Check if 24 VAC is present at valve . If so, check wiring of
Vapor-logic
control board terminal P17 (drain) .
• Poor tank ground
• Verify good machine ground .
Continued
OPERATION
