51
XT SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
DRAIN VALVE
If either of the following issues occur after several months of runtime, follow the
drain valve maintenance procedures below.
• Drain valve is closed, but draining and fi lling continue.
• End of cylinder life prompt appears prematurely.
DRAIN VALVE BODY MAINTENANCE
1. When steam cylinder is empty, turn humidifier off. Place all power
disconnects in OFF position, and lock in OFF position. See Figure 51-1.
2. Remove cabinet doors and steam cylinder (see Page 10).
3. Vacuum loose scale and debris out of the drain valve port.
4. Disconnect 2-pin Molex plug from 24 VAC drain valve coil.
5. Slide cap (A) off of drain valve coil (C).
6. Turn hex nut (B) counter-clockwise. Loctite on nut will cause drain valve
coil assembly to turn out of drain valve body (G). Remove coil/actuator
assembly from drain valve body. Make sure spring (E) and plunger (F) do
not fall out of actuator (D).
7. Clean plunger (F), spring (E), actuator (D), and plastic drain valve body
(G) with clean water.
8. Reassemble drain valve. When threading actuator (D) into drain valve
body (G), make sure it is not cross threaded. Torque actuator into drain
valve body to 18 in-lb (2.0 N·m).
9. Plug Molex plug into its mating wire harness plug, and slide cap (A) onto
drain valve coil (C).
10. See “Start-up procedure” on Page 48 if returning humidifier to
operation.
Note: If the procedure above did not resolve drain valve issues, perform the
drain valve assembly maintenance procedure on Page 52.
Maintenance:
OM-7631
Drain valve body (G)
Plunger (F)
Spring (E)
Drain valve coil (C)
Nut (B)
Cap (A)
Drain valve body
Ground plate
Drain cup plate
Drain cup
Insert
OM-7630
Drain valve coil
O-ring
Wires to Molex plug
Actuator (D)
Torque to 18 in-lb (2.0 N·m)
Notes:
•
Pay close attention to all parts shown above.
Verify that ground plate is in groove of drain
cup, and insert is in place through ground
plate loop.
•
Failure to get ground plate and insert solidly
connected to frame will compromise ground
safety circuit.
FIGURE 51-1: DRAIN VALVE ASSEMBLY
MAINTENANCE
FIGURE 51-2: DRAIN VALVE BODY
Drain valve