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Page 26
4.10 Gas Supply Pressure
R efer 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. T he 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. T he 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
Maximum
10.5˝
Pressure
WC
Minimum
3.5˝
M
ascot ST Gas Conversion Kit
Pressure
WC
M
ascot ST Gas Conversion Kit
Table 11. Min and Max Inlet Gas Line Pressures
WARNING
WARNING
Always make sure that the Control Display is turned
4.11 Gas Setup and Adjustment
OFF before changing any DIP switch. Then turn Control
Always make sure that the Control Display is turned
Display back ON to continue with CO 2 measurements.
OFF before changing any DIP switch. Then turn Control
For the Step by step process to measure
Display back ON to continue with CO 2 measurements.
25.
Once the CO 2 and manifold pressure
CO 2 values on the Mascot ST, please refer to
25.
measurements for both MIN and MAX Fire are
Step 19 thru Step 24 in Section 4.13 of this
Once the CO 2 and manifold pressure
correct (for your altitude) turn OFF the Control
Installation Manual.
measurements for both MIN and MAX Fire are
correct (for your altitude) turn OFF the Control
Display
and set DIP switches 6 and 7 to the
Display
WARNING
OFF position for Nominal Fire (normal operation).
OFF position for Nominal Fire (normal operation).
Turn the Control Display
Installer is required to verify combustion settings as part of
Turn the Control Display
26.
Write in the correct Conversion Date and the
the installation process. CO should not exceed 300 ppm.
26.
Technicians Name to the included gas conversion
Write in the correct Conversion Date and the
sticker. See Figure E. Then apply that sticker
Technicians Name to the included gas conversion
adjacent to the rating plate.
sticker. See Figure E. Then apply that sticker
Standard Factory Setting is for MIN Fire. 9.0% CO 2 @ 0 - 2,000 ft altitude (Natural Gas).
27.
Put the water heater cover back on and assemble/
adjacent to the rating plate.
27.
tighten the 4 screws that hold the cover in place.
Put the water heater cover back on and assemble/
tighten the 4 screws that hold the cover in place.
Manifold pressure
Manifold pressure
MAX FIRE
MSTWW199
MIN FIRE
MSTWW199
Table D
Table 12. Manifold Pressures
Table D
This unit was converted on ____/____/___to _____gas
with kit #____________by______________________
This unit was converted on ____/____/___to _____gas
(name and company __________________________
with kit #____________by______________________
accountable)_________________________________
(name and company __________________________
___________________________________________
accountable)_________________________________
Cette unité a été converti ____/____/____ten ______gaz
LP Gas
Maximum
13.0˝
Pressure
WC
Minimum
8.0˝
Pressure
WC
and set DIP switches 6 and 7 to the
back on when done.
back on when done.
'NG' type combustibility
'NG' type combustibility
-0.11" to -0.17" WC
MAX FIRE
-0.11" to -0.17" WC
-0.10" to -0.16" WC
MIN FIRE
-0.10" to -0.16" WC
Manifold
pressure
port.
Inlet Gas
pressure port
Offset Fire
Adjustment
Screw
Adjust ONLY when in
MIN Fire and when
using a combustion
analyzer.
See Section 4.12 for
step by step details.
High Altitude
Setting level
High Altitude
Setting level
MSTWW199
MSTWW199
0~2,000 ft
0~2,000 ft
2,000~5,000 ft
Table 10. CO 2 Values
2,000~5,000 ft
5,000~8,000 ft
5,000~8,000 ft
8,000~10,000 ft
8,000~10,000 ft
Table C
Table C
'LP' type combustibility
'LP' type combustibility
-0.07" to -0.11" WC
-0.06" to -0.10" WC
Figure E (Conversion label)
Figure E (Conversion label)
LAARS Heating Systems
Document 4286
Document 4286
CO 2
'LP'
'NG'
Values
Values
CO 2
'LP'
Values
2" or 3" VENT
2" or 3" VENT
2" or 3" VENT
2" or 3" VENT
10.7
MAX
10.7
MAX
9.7
MIN
9.7
MIN
10.2
MAX
10.2
MAX
10.3
MIN
10.3
MIN
10.3
MAX
10.3
MAX
10.4
MIN
10.4
MIN
10.5
MAX
10.5
MAX
10.6
MIN
10.6
MIN
-0.07" to -0.11" WC
-0.06" to -0.10" WC
CO 2
CO 2
'NG'
Values
10
10
8.5
8.5
9.1
9.1
9.7
9.7
9.1
9.1
9.8
9.8
9
9
9.8
9.8
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