INSTALLATION (cont’d)
ENERGY CUT OFF (E.C.O.)
CONNECTION
A
Connect the leads from the E.C.O. terminals to the E.C.O. device on the furnace. Test the E.C.O. device for continu- ity. If there is no continuity, the power unit will not hold in. See figure 5.
If the furnace does not have an E.C.O. device, jumper the E.C.O. terminals on the valve with the jumper loead provided.
THERMOCOUPLE CONNECTION
(For .750 VDC (Special), 24 VAC and
120 VAC Models)
The thermocouple connection should be clean to ensure good electrical contact.
Run the thermocouple nut into the power unit tapping as far as possible by hand. Then use a small wrench to set the nut with a 1/4 to 1/2 additional turn. Do not over- tighten.
PILOT GENERATOR CONNECTION
(For .750 VDC Models)
Be sure the pilot generator is completely engaged into the pilot burner.
Be sure that the two terminals from the pilot generator are securely tightened beneath the proper screws on the valve.
Connect the power unit lead to the high limit and the high limit to the
PILOT GAS ADJUSTMENT
If the pilot flame is low and does not engulf the bulb of the mercury flame sensor, the system will not energize the main valve. If pilot gas pressure is too high, gas will sputter past the ignition electrode, and may not ignite. High pilot gas pressure may also cause the flame to lift off the burner, causing the flame sensor bulb to sense "low" heat.
To adjust the pilot gas pressure, remove the cover screw (see fig. 7). To REDUCE pilot pressure, turn the pilot adjust screw (beneath the cover screw) clockwise. To INCREASE pilot pressure, turn the pilot adjust screw counterclockwise. Replace and tighten cover screw.
Pilot adjust cover screw
Gasket
Pilot
adjust screw
Figure 7. Pilot gas adjustment
PRESSURE REGULATOR
ADJUSTMENT
The pressure regulator has been factory adjusted (see control for specific setting). Although additional adjust- ments will not normally be necessary, you may adjust the regulator. Do not force the adjusting screw beyond the limits that it can easily be adjusted.
1.Energize valve to ignite main burner.
2.Remove "Reg. Adj." cover screw (see fig. 8).
3.To DECREASE outlet pressure, turn the adjusting screw (beneath the cover screw) counterclockwise. To INCREASE outlet pressure, turn the adjusting screw clockwise.
4.Replace the cover screw. Cycle the valve two or three times to verify regulator setting.
Regulator adjusting
cover screw
|
| Pilot adjust |
ON | T | cover screw |
| OL |
|
| IP FFO |
|
Figure 8. Pressure regulator adjustment
4