Weil-McLain Aqua Balance WMB-155 Manual page 78

W
TM
AquaBalance
30 6WDUWXS ² ¿QDO FKHFNV
At Minimum Rate:
1. Remove T-40 cap, see Figure 103, page 77, for Offset screw
adjustment. Adjust the boiler to minimum output and allow
the boiler to stabilize.
2. Now adjust the offset pressure setting (Figure 104 - screw B)
Torx (T-40 male driver) until the CO
TING LEVEL (see Figure 105), confirm that the CO/CO
ratio is within limits (clockwise to increase gas).
Figure 104 Offset adjustment screw
(ONLY for use by a qualified technician, using
calibrated combustion test instruments).
Offset adjustment
Adjust in steps of no more than 1/8 of a turn and
wait 1 minute after each adjustment to allow the
setting to stabilize. Turning the screw too far will
cause the adjustment to reverse behavior.
Figure 105 Minimum rate combustion values –
measured values must be within the ranges
given below
/LP
Natural Gas Acceptable Combustion Range
Minimum Rate after 10 minutes from cold
Boiler Model CO/(PPM)
WMB-80 20
WMB-120 20
WMB-155
7
78
M -
ALL OUNT GAS FIRED WATER BOILER
is at the correct SET-
2
––
Offset Regulating screw
Test at MIN. Power 00%
Turn clockwise (open gas)
IRU ³0$; JDV ÀRZ´
Turn counter-clockwise
(close gas)
IRU ³0,1 JDV ÀRZ´
Rough start point
For LP Start up ONLY
Adjust gas valve
LOW FIRE
screw on left with
Allen wrench
Counter-Clock wise
 ó turn.
Final Combustion values
MUST BE checked with
B
Combustion Analyzer.
CO NG % CO LP %
2 2
8.0 – 9.0 9.0 – 9.8
8.0 – 9.0 9.0 – 9.8
8.0 – 9.0 9.0 – 9.8
—
Boiler Manual
(continued)
Re-check the Maximum and Minimum
Rate
3. After the gas valve is adjusted, please check one more
time that the Maximum and Minimum rate CO/CO
to ensure that the values have not changed.
4. In the event that the CO
CO/CO ratio cannot be obtained please contact your
2
2
Weil-McLain Technical Support.
❏
Check Heat exchanger and vent seals
1. Operate the boiler on HIGH fire.
2. A leak would appear as vapor on the surface of the
mirror.
3. If there is any indication of a leak at any joint, immedi-
ately shut down the boiler.
a. If possible, tighten the retaining screws or nuts
(without over-tightening).
b. If this does not correct the problem, disassemble
the components where the leak appeared. Use the
procedures given in the Maintenance section of
this manual.
c. When disassembling components, inspect gaskets to
see if there is damage. Replace any damaged gasket.
d. Contact your Weil-McLain Technical Support if the
problem cannot be addressed with the information
provided in this manual.
❏
Check ignition system safety shutoff device
turn
1. After the boiler has been installed, turn off the boiler.
2. Shut off the manual gas valve located on the gas line to
cut flow of fuel to the boiler.
3. Turn on the boiler. It will start to ignite and a "d3" code
will flash. After the "d3" code flash for some time the
boiler will go into a Lockout condition and a "A01" code
will show in the display. It means that the boiler tried to
ignite without success (code "d3") for three (3) times
and when into Lockout mode(code "A01"). This means
that the ignition system safety device worked properly.
4. Open the manual gas valve located on the gas line to
resume fuel supply to the boiler.
5. Hit the "Reset" button once to Clear the Lockout code
"A01".
setting level with an acceptable
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Part number 550-100-305/0118
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