Slant/Fin VHS-120 - Manual (Page 5)

V
ICTORY
II VHS MODELS
Figure 6. Figure 7.
A. High limit control test
Set thermostat high enough for water tempera-
ture 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.
B. Gas control safety shutdown test
With main burners firing, disconnect the ignition
cable from S8600 ignitor (see Figure 9). Gas
valve should shut off the main burners.
C. Air flow pressure switch test
With main burners firing, remove plastic hose
from Pressure Switch (see Figure 7). Gas valve
should shut off the main burners.
WARNING: If any of the above controls fail to operate
properly, they must be replaced.
D. Checking for gas leaks
Using soap solution, check for gas leaks from
meter to burner, including gas piping, manifold
and pilot burner.
DO NOT use open flame.
2. Venting system inspection
See Page 3 for instruction.
3. Condensation drain trap inspection
See page 4 for instruction.
4. Piping inspection
Check the following:
A. Water piping and accessories for leaks. Slightest
leaks should be corrected.
B. System to be full of water and pressure to
remain stable at correct setting on gauge.
C. Air-control system. Noise and air binding in radi-
ation should not occur.
D. Low water cutoff for operation (see instructions
furnished with unit).
E. Check water pressure and add water slowly to
system when needed. If much water is added,
venting may be necessary. Regular loss of water
from boiler system may indicate either a system
leak, or a faulty air control system, or a faulty
automatic fill valve.
5. Boiler room air supply inspection
Check air vents for continued positive supply of air
as required. Air needs are greatest in cold weather.
Air vents must be open and free of obstruction.
WARNING: The flow of combustion and ventilating air
to the boiler should not be obstructed.
ANNUAL SERVICE TECHNICIAN
INSPECTION AND CLEANING
A. Flue passage cleaning
See Figure 8. It is suggested that paper be placed on
burners to collect any foreign material in cleaning flues.
1. Remove control box (see instruction under
“Safety Check”).
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