Lochinvar 000 - 2 - Manual (Page 43)

Installation and
Service Manual
43
Adjustment Procedure: 1,435,000, 1,795,000 and
2,065,000 Btu/hr Models
1. Remove the upper front jacket panels from the unit to
access the upper chamber.
2. Slightly loosen the screws that attach the fan transition box
to the metal base (see Figure 46).
3. Locate the air shutter at the rear of the fan duct (see
Figure 47). Move the air shutter towards the rear of the unit
to increase air pressure. Move the air shutter towards the
front of the unit to decrease air pressure.
4. Adjust the air shutter until the differential pressure is
nominally 1.1 - 1.3 inches water column. Note: The air
chamber pressure is 1.2 inches water column for
liquefied petroleum (L.P.) and 1.4 inches water column
for natural. See Figure 45 for installations up to 2000 feet
altitude. Contact the factory for high altitude settings.
5. Once the adjustment procedure is complete, reattach the
caps to the tees in the hoses to the pressure switch and
check all tubing and wire connections for a snug fit. Test
fire the unit. Reinstall upper panels.
Figure 46 - Loosening the Transition Box Screws,
1,435,000, 1,795,000 and 2,065,000 Btu/hr Models Only
Figure 47 - Adjusting Air Shutter
Servicing Hot Surface Igniter and
Ignition Module
This unit uses a proven hot surface ignition module and a hot
surface igniter. The hot surface ignition module is not
repairable. Any modification or repairs will invalidate the
warranty.
ƽ
WARNING: Do not attempt to repair a faulty
hot surface igniter or ignition module. Any
modification or repairs may create hazardous
conditions that result in property damage,
personal injury, fire, explosion and/or toxic gases.