Laars LT Series, Инструкция по установке и эксплуатации

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Page 30
Manifold pres-
sure port.
Offset Fire
Adjustment Screw
Inlet Gas
pressure port
4.10 Gas Supply Pressure
Refer to the illustration. Check the gas inlet pressure
measurement from inlet gas pressure port.(Loosen the
port bolts before you check the gas inlet pressure.)
1. The appliance and its individual shutoff valve must
be disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of 1/2 psi (3.5 kPa).
2. The appliance 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
1/2 psi (3.5 kPa).
Natural Gas
Propane
Maximum
Pressure
10.5˝
WC
Maximum
Pressure
14.0˝
WC
Minimum
Pressure
3.5˝
WC
Minimum
Pressure
8.0˝
WC
Table 10. Min and Max Inlet Gas Line Pressures
Follow these steps.
1. Establish a call for water by opening a hot water
tap.
2. Set up your combustion analyzer and place the
sensor in the combustion test port.
3. Per Table 15 for Max fire, change dip switch 6 to
ON and 7 to OFF. The unit will cycle up to M ax fire.
Make sure to draw from at least 2 sinks and 2
showers when performing this verification.
4. Wait for your combustion analyzer to stabilize
(This may take up to 3 minutes depending on your
analyzer). Then measure your CO2 for
Max fire. Refer to Table 11 for acceptable
M ax fire combustion readings. DO NOT
ADJUST CO2 AT MAX FIRE, ONLY AT
MIN FIRE.
5. Change dip switch 6 to OFF and 7 to ON.
The unit will cycle down to MIN fire.
4.11 Gas Setup and Adjustment
Table 11. CO
2
Values
Table 12. Manifold Pressures
WARNING
Installer may be required to verify combustion
settings as part of the installation process.
CO should not exceed 200 PPM. Check local
codes.
Standard Factory Setting is for MIN Fire. 9.0%
CO2 @ 0 - 2,000 ft altitude (Natural Gas).
Continue to next page.
CO
2
Values
Natural Gas (NG) Propane Gas (LP)
2" or 3" VENT 2" or 3" VENT
LT199
(all versions and
all altitudes )
MAX FIRE 8.5 - 10.5% 9.5 - 11%
MIN FIRE 8 - 10% 9 - 10.5%
Manifold Pressure
LT199 MIN FIRE +0.07" to +0.13" WC -0.02" to -0.08" WC
‘ Natural Gas ’ type
combustibility
‘ Propane ’ type
combustibility