Heat Exchanger Cleaning; Electrical; Combustion And Ventilation Air; Adjusting Differential Air Pressure - Lochinvar 000 - 2 Installation And Service Manual

Heat Exchanger Cleaning

1. While burners are removed, check the heat exchanger
surface for sooting. If present, heat exchanger must be
cleaned and problem corrected. Proceed as follows.
2. Remove gas manifold(s)/orifice assemblies as described in
steps 1 through 5 in Burner Removal and Cleaning, page
40.
3. Disconnect wiring from the hot surface igniter and hose
from the burner pressure tap.
4. Remove inner jacket panel mounting screws and slide door
assembly out toward front of the unit. Use caution to
prevent damage to the refractory and hot surface igniter.
5. Check "V" baffles and frame runners along front and back
edges of heat exchanger. Remove and clean if necessary.
6. Remove soot from heat exchanger with a stiff bristle brush.
Use a vacuum to remove loose soot from surfaces and
inner chamber.
7. The heat exchanger can be removed by sliding towards the
front of the unit. Once the heat exchanger is removed from
the unit, a garden hose can be used to wash the tubes to
ensure that all soot is removed from the heat exchanger
surfaces. Note: Do not wet the unit's refractory.
8. Ensure that all burner ports are cleaned to remove any soot.
See Burner Removal and Cleaning, page 40.
9. Carefully reinstall the heat exchanger, "V" baffles, and
frame runners if removed from the unit. Note: Make sure
frame runners seal securely where they contact the front
and rear compartment refractory.
10. Carefully reinstall inner jacket panels, burners, manifolds,
wires and hoses. Use new gasket material to ensure a
proper air seal.
11. Reassemble all gas and water piping. Test for gas leaks.
12. Reassemble outer jacket panels.
13. Cycle unit and check for proper operation.

Electrical

This unit uses a transformer to supply a low voltage control
circuit. The voltage on the secondary side should be 24 to
28VAC when measured with a volt meter. Larger models have
a 7AMP circuit breaker provided on the secondary side of the
transformer. A tripped circuit breaker indicates a short in the
24VAC controls that must be corrected.
Installation and
Service Manual

Combustion and Ventilation Air

Combustion Air Filter (Models 985,000 -
2,065,000 Btu/hr Only)
This unit has a standard air filter(s) located behind the
combustion air inlet panel(s). This filter helps ensure clean air
is used for the combustion process. Check this filter every
month and replace when it becomes dirty. The filter size is
12" x 16" x 1" (30.5cm x 40.6cm x 2.5cm). You can find this
commercially available filter at any home center or HVAC
supply store.
To install filter, see Combustion Air Filter, page 8.
Air Flow
Check frequently to be sure the flow of combustion and
ventilation air to the unit is not obstructed.
Combustion Air Fan
These units use a fan-assisted combustion process. These units
have one fan to supply combustion air to the burners.
Fan Cleaning
Check each combustion air fan every six months. Clean fan as
required when installed in a dusty or dirty location. Oiling is
not required.
Combustion Air Fan Adjustment
The combustion air fan is factory preset and should not need
adjustment in most cases. Follow the steps below to adjust the
fan if a continuous Low Air Status Code occurs.
Check for proper installation and draft in the venting system.
Correct as required.

Adjusting Differential Air Pressure

The following is a recommended method for setting the
differential air pressure ( P) for the fan.
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