Westinghouse WBRC 140 Series, Установка, Запуск, Обслуживание, Запчасти, Гарантия

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whl-648 Rev. 001 Rel. 003 Date 10.8.19
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C. Additional Precaution for Excess Flow Valve (EFV)
If an excess flow valve (EFV) is in the gas line, check the manufacturer’s
minimum and maximum flow capacity ratings. An improperly sized
EFV will not allow for a full flow of gas to the boiler and will cause the
boiler to malfunction. See Figure 38.
Figure 38 - Excess Flow Valve (EFV)
D. Checking Gas Pressure at the Boiler for Proper
Operation
NOTE: Refer Figure 39 when checking gas pressure. Loosen the bolts
before checking the gas inlet pressure.
1. The boiler and its individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing of
the system at test pressures greater than ½ psi (3.5 kPa).
2. The boiler must be isolated from the gas supply piping system
by closing its individual manual shutoff valve during any pressure
testing of the gas supply piping system at test pressures equal to or
less than ½ psi (3.5 kPa).
The minimum and maximum inlet gas line pressures must meet the
requirements shown in Table 24.
Natural or LP Gas
Minimum Pressure 3.5” WC
Maximum Pressure 14”WC
Table 24 - Gas Pressure Requirements
NOTICE
Do not fire (operate) the boiler until all connections have been
completed and the heat exchanger is filled with water. Doing so
will damage the boiler and void the warranty.
Figure 39 - Gas Valve Detail
E. Setting and Verifying the Combustion Setting
1. After the boiler has fired, flip DIP switch seven (7) to the ON
position (low fire). Proceed to check boiler combustion values.
NOTE:
Use a calibrated combustion analyzer to ensure CO and CO2
values are within the range shown in Table 25.
WARNING
!
It is required to use a calibrated combustion analyzer to verify final
adjustment according to the combustion chart (Table 25). Failure to
do so could result in serious personal injury or death.
If the readings obtained are lower or higher than the combustion
readings in Table 25, use a 4mm Allen key to adjust the offset screw
in a clockwise (positive) or counterclockwise (negative) direction
(approximately 1/4 turn). See Figure 39. Check your combustion values.
Repeat this procedure until the values obtained on the calibrated
combustion analyzer agree with those stated in Table 25.
NOTE: If the boiler makes a whistling sound (harmonics) at low fire,
adjust the offset screw in a clockwise (positive) direction (approximately
1/8 turn). Check your combustion values and ensure they agree with
those stated in Table 25 before proceeding.
2. When low fire settings have been obtained, flip DIP switch seven
(7) to its original (OFF) position. This will return the boiler to normal
operation.
3. Flip DIP switch six (6) to ON (high fire). Again check combustion
readings with a calibrated combustion analyzer.
NOTE: DO NOT adjust the gas valve offset screw at high fire. The offset
screw is only used to adjust combustion values at low fire.
4. When complete, flip DIP switch six (6) to its original (OFF) position.
This will return the boiler to normal operation.
5. Allow boiler to operate normally. Ensure it is operating properly.
6. Use a Phillips Head screwdriver to reinstall the boiler cover.
WARNING
!
It is very important that the combustion system be set within the
recommended CO measurements listed in Table 25. Visually looking
at the burner does not determine combustion quality. Failure to
measure combustion with a calibrated combustion analyzer and
set the throttle within the recommended CO measurements could
result in property damage, severe personal injury, or death.
Natural Gas LP Gas
Fan Speed Low High Low High
CO PPM <175 <175
CO
2
(%) 8 - 9 1/2 8 1/2 - 10 9 - 10 1/2 9 1/2 - 11
Table 25 - Combustion Settings