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1. Check distribution piping for proper pitch and size. Make sure there are no loops, dips or
sags where pockets of water can collect. If such conditions exist and are unavoidable, a ‘P’
trap is needed to drain the low spots.
2. Make sure any drains are piped correctly and pitched to a floor drain.
3. Check duct downstream of manifold. If any obstructions (coils, elbows, fans) are within 10',
the vapor (condensed steam) discharged from the manifold may be impinging on the obstacle before
it has a chance to adsorb into air. This is especially true if the duct air is cold (<60°F), duct air velocity
is high (>1000 FPM), or duct %RH is high (>90%). If these conditions exist and impingement is
suspected, consult factory.
4. The duct air may be saturated with moisture (100% RH). A high limit humidistat is
recommended to prevent this. See Installation section.
Water in bottom of cabinet HC-4100/4145/4300 Only
1. Verify that pressure equalizing tubing is hooked up from top of electrode level canister
to the tank.
2. Check steam distribution piping for obstructions.
3. Verify duct air velocity is less than 2000 FPM and manifold is not in a vertical down air flow.
4. Check for leaks at fittings and clamps in water supply lines.
5. Verify that tank access panel gasket is on lip of access hole and the access panel is
secured tightly.
6. Make sure the duct pressure and steam distribution back pressure don’t total more than
6” WC.
Diagnostics
There are some diagnostic routines programmed into the PC board. If these routines detect a problem
the unit will shut down and flash the “ERROR” LED a certain number of times, followed by a long pause.
1 Blink - - The low level switch has not closed after 35 minutes of fill valve on time.
This is only on initial start-up or after a complete drain down.
Check: defective fill valve, debris in fill valve inlet screen or on tank drain screen,
water leakage from tank or inlet tubing, no water flow or low water pressure, drain valve
stuck open or leaking, defective low water level switch (electrodes need to be cleaned).
2 Blinks - - The low level switch has not closed after 3 minutes (7 minutes HC-4500) of fill
valve on time. This is only after initial start-up fill and boil-down sequence.
Check: debris in water switch canister, defective fill valve, no water flow or low water
pressure, drain valve stuck open, defective low water level switch (electrodes need to be
cleaned).
3 Blinks - - The high level switch has not closed after 56 minutes of fill on time.
This is only on initial start-up or after a complete drain down.
Check: debris in fill valve inlet screen or in tank drain screen, water leaking from tank
or inlet tubing, low water pressure, defective high water level switch (electrodes need to
be cleaned).
4 Blinks - - The high water switch is still closed 5 minutes after the fill valve has turned off
upon hitting the high water level and a 30 second drain does not drop the water below
the high water level.
Check: defective high water level switch, debris in level canister, fill valve stuck open,
drain valve is defective or scale buildup in drain line.
