Drain Valve Cleaning - Nortec NHTC Installation And Operation Manual

Drain Valve Cleaning

Always clean the drain valve before installing a new cylinder. Scale from the spent cylinder may
have fallen into the drain valve and could prevent its proper operation. To properly clean the
drain valve it must be removed and disassembled.
Note: Be sure to reattach the green ground wire to reduce the risk of electrical shock.
1 Disconnect spade terminals from the drain valve.
2 Remove the screw holding the green ground wire and the two screws holding the valve to
the drain pan.
3 Squeeze the tabs of the spring clamp holding the hose to the drain valve and slide it up the
hose. Pull hose from drain valve. Lift the drain valve from the drain pan.
4 Unsnap red coil cap on solenoid and remove the solenoid from the valve.
5 Loosen brass nut holding actuator to plastic housing with a wrench and disassemble
actuator.
6 Clean actuator components and valve housing (inlet port, outlet port, and cylinder port). Put
new o-ring that was supplied with new cylinder into valve.
7 Reassemble actuator making sure tapered end of spring is oriented as shown in Figure 45:
Drain Valve Actuator Assembly. Tighten brass nut 1/4 turn past hand tight.
8 Clean out end of hose and reattach to valve. Slide hose clamp back in place and place valve
into drain pan.
9 Secure valve with 2 screws and attach green ground wire to solenoid.
Hose and
Hose Clamp
Screws
63 | Maintenance and Servicing
Cylinder Port
and O-ring
Brass Nut
(Actuator)
Figure 44: Drain Valve
Ground Wire
Solenoid
Spade Connectors