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VI
CTORY
II V
HS Models
1. High Limit Control Test
Set thermostat high enough for water temperature to
reach high limit control setting of Aquastat. When this
temperature is reached, the high limit switch should open
and the main gas valve should close automatically.
2. Gas Control Safety Shutdown Test
With main burners firing, disconnect the ignition cable
from S8600 ignitor (see Figure 17).
Gas valve should shut off the main burners. If gas valve
fails to shut off the main burners, replace the gas valve.
3. Air Flow Pressure Switch Test
With main burners firing, remove plastic hose from Pres-
sure Switch (see Figure 22). Gas valve should shut off
the main burners.
WARNING: If any of the above controls fail to operate
properly, they must be replaced.
4. Checking for Gas Leaks
Using soap solution, check for gas leaks from meter to
burner, including gas valve, gas piping, manifold and
pilot burner.
DO NOT use open flame.
CARE AND MAINTENANCE
This section must be brought to the attention of the owner by
the installer so that the owner can make the necessary
arrangements with a qualified service agency for the periodic
care and maintenance of the boiler. The installer must inform
the owner that the gas supplier can recommend a number of
qualified service agencies. The installer must also inform the
owner that the lack of proper care and maintenance of this
boiler and any fuel burning equipment may result in a haz-
ardous condition. Installer should discuss contents of the
User’s Information Manual (Publication VHS-UIM) with the
owner.
A trained and qualified service technician should perform the
inspections listed in these instructions before each heating
season and at regular intervals.
1. General Maintenance
A. Boiler control check. See “Safety Check” on Page 20.
B. Venting system inspection
1. Check for obstructions, condensation, corrosion and
physical damage.
2. If the boiler is vented horizontally through the wall,
the outside termination and screen should be
checked for any debris blocking the opening and
cleaned as required.
Figure 20.
Figure 21.
Figure 22.
21