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Installation Cont.
5. GCV3412 Code Valve Installation Instructions*
Copper Pipe:
1. CAUTION: Turn off water supply.
!
2. Clean pipe, fittings and valve with sandpaper or wire brush.
3. Apply a thin layer of flux to all surfaces to be soldered.
4. Assemble valve to pipe and/or fittings.
5. Cooling the valve by wrapping a wetted rag around the valve is optional.
!
For your safety, this should be performed by a licensed
6. WARNING:
contractor only.
Continue to apply heat sufficient to keep solder liquid.
7. After solder has filled entire joint area, remove heat and allow joint to cool. Do not
move or disturb.
8. Slide compression nut over 1/4" copper tube followed by compression sleeve.
9. Insert tube fully into valve and tighten nut.
10. Turn on the water supply and check for leaks.
*Code Valve Is Included With Automatic Models Only
Connect 1/4" water supply tube to brass filter at
inlet of solenoid.
!
CAUTION: Do not use plastic tubing in contact
with any hot plenum surface or duct. If using
plastic tubing, use tube insert P189 and plastic
compression sleeve P190 (available as part of
assembly 747-38 tubing kit, GFI #7078).
6.
Turn damper knob to WINTER position. Turn on the water supply and check operation of humidifier. Set the
humidistat to a demand setting. With the furnace off, the solenoid valve should be closed. Start the furnace,
the solenoid valve should open when the blower or burner circuit is energized. Check flow of water through
distributor trough and evaporator pad. The standard GA4231 (YELLOW) orifice will supply approximately
3.5 GPH of water at a line water pressure of 60 PSI. For low water pressures (20-40 PSI) a larger (ORANGE)
orifice GA4299 is available to provide the same flow. Leave humidistat set at the recommended setting.
Connect the drain hose to 1/2" spout on humidifier cabinet using hose clamp. Run 1/2" hose to suitable
drain such as floor drain, laundry sink, or to a condensate pump (sold separately). Be sure hose has
continuous slope and is not kinked at any point.
Heat the joints with a torch. Apply solder to each joint.
Model 900 Humidifier Installation Manual
1/2" TEE
3/4" TEE
www.generalfilters.com
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