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3. This color-coding must be adhered to when
replacing cylinder plugs on pins.
4. The electrode plug with the orange wire always
goes on the single pin surrounded by a plastic
shoulder.
5. Ensure that cylinder plugs fit snugly on the pins.
6. If a cylinder plug becomes loose the cylinder
harness must be replaced (P/N 158-1305 see
parts list).
MANDATORY CLEANING OF THE DRAIN
VALVE
Always clean the drain valve before installing a
new cylinder since the valve port may be as dirty as
the used cylinder.
1. Note the ring terminal for drain valve green ground
wire is sandwiched between the drain valve body
and drain pan.
2. Remove the two screws securing drain valve body
to the drain pan. Disconnect the two slip-on
terminals from the two tabs on the (24 Vac) drain
valve coil.
3. Remove the hose clip and hose connection from
drain valve body.
4. The drain valve assembly is now free to be taken
to a sink for disassembly and cleaning.
5. Remove the snap-fit red cap from the coil
assembly and slide coil off the actuator.
6. Loosen the actuator with a wrench and unscrew
from the plastic valve body.
7. Clean the exposed core, spring and plastic drain
valve port.
8. The tapered end of the spring must be installed
toward the solenoid. Reassemble and tighten the
actuator 1/4 turn past hand-tight.
9. Clean out the end of the hose, then reconnect it to
the drain valve body with the clamp.
10. Inspect the o-ring to make sure it is in good
condition.
11. Fit mounting screws through the drain valve body,
one through the ring terminal on green ground
wire.
12. Push the two slip-on terminals back onto the two
tabs on the coil. The terminals, although not
identical, are reversible.
WARNING: To prevent the possibility of electrical
shock the green ground wire must be reinstalled
before power is restored.
EXTENDED SHUTDOWN
Before disconnecting power to the humidifier at
the end of humidification season, ALWAYS DRAIN the
cylinder first. Otherwise, the electrodes are subject to
harmful corrosion which shortens cylinder life. Do
NOT leave the switch in the DRAIN position
indefinitely as the drain coil could burn out. Leave the
switch in the OFF position and “open” the main
external fused disconnect to stop power to the
humidifier. Close the shut off valve in the water supply
line feeding the humidifier. Lock the cabinet door(s) to
prevent unauthorized tampering. All doors are factory
supplied with keyed locks. DO NOT LEAVE THE KEY
IN THE LOCK. ACCESS SHOULD BE LIMITED TO
AUTHORIZED PERSONNEL ONLY.
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