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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
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18
Setting The Maximum Load
A means of sampling the leaving flue gas is built into the vent connector on top of the appliance. Remove the rubber plug for testing
and replace when testing is completed. This plug MUST be in place during normal operation.
Enter the service function from the setup menu. After the service function is active, fan speed percentage can be set. This should be
set to 100% to achieve maximum fan speed for high fire combustion setting.
If necessary, turn the adjusting slot [1], which sets the high fire performance, either counterclockwise to increase the CO
2
percentage
or clockwise to reduce the CO
2
percentage, as shown in Figures 3.2 and 3.3, page 15. Appropriate CO
2
percentages are shown in
Table 3.3 above.
Gas Connection - Continued
Table 3.5 Fan Speed Requirements
HW 299
Fan Type
Maximum RPM
Minimum RPM
EBM
6300
1575
Ametek
6500
1625
HW 399
Fan Type
Maximum RPM
Minimum RPM
EBM
6200
1798
Ametek
7200
1800
HW 599
Fan Type
Maximum RPM
Minimum RPM
EBM
5800
1624
Ametek
9300
2511
Setting The Minimum Load
Set the minimum load once the maximum load has been set, set the fan speed in the service function to the minimum RPM setting.
In order to set or adjust the minimum load, turn the screw [2] for the minimum setting (first remove the protective cap). Turn the
screw clockwise to increase or counter clockwise to decrease the CO2 percentage. On the HW 599, you only are allowed to set
the gas valve at the right side; the left gas valve is set by the manufacturer.
See Gas Valve Maintenance/Replacement Section for
special instructions on replacing both gas valves in a model 599.
1. If the measuring process takes more than 40 minutes, the appliance will return to the automatic mode. If so required, enter the
Service function another time.
2. When you are done setting the valve, press stop in the Service function to return to normal run mode
Please do not forget to replace the protective cap on the gas valve!
If the appliance is to be converted in the field for using Propane (LPG), the following steps must be taken:
• Turn screw [1] clockwise (Figure 3.2) ¾ of one turn (270°) on models 299 and 1 full turn (360°) on model HW399.
• On model HW599 (Figure 3.3) turn screw on left hand valve closed (clockwise) and turn right valve 1-¾ f a full turn clockwise.
• Run the appliance. If the burner does not ignite after four starting efforts, turn the screw [1] one half turn back (180°) (counter
clockwise).
• After conversion, follow the steps in for setting the maximum and minimum loads, using the LP gas values shown in Table 3.3.
Gas Conversion
