75
Input signal always
has a demand
VAPOR-LOGIC
program
Drain valve
Drain valve
Aquastat
Heating element
SCR Power
Controller
Contactor
38
39
Operation
Troubleshooting guide.
Problem
number
Problem
Possible cause
Action
More on next page ...
Unit does not perform
end of season drain
Humidifier tank has
proper water level and
is always warm
Reduce demand signal.
Program may be arranged for manual
drain. Run a test cycle to see if
system operates drain valve.
Valve not wired to or incorrectly
wired to control board.
Faults check 24 VAC across valve
coil during test cycle.
Normal, aquastat is maintaining a
certain water temperature in tank
range 4 - 82°C.
Re-adjust aquastat temperature to low
set point.
Shorted to ground passing current.
Check replace
SCR control devices shorted close,
check replace
Phase to phase wiring crossed
Contactor shorted closed, check
replace
Operation:
Troubleshooting guide
VL3-IOM-0301-METRIC.pdf 79
11/19/2009 9:22:40 AM
Summary of Contents for Vapor-logic3
Page 4: ......
Page 81: ...77 Operation Notes Operation Notes...
Page 82: ...78 Operation Notes Operation Notes...
