Landa ENG4-2000 Operator's Manual page 14

INSTALLATION
This process can also be used when turning down the
firing rate for high altitude installations above 2000 ft.
1. Adjust the gas pressure down 4% for every 1000
ft of elevation.
Example: Recommended firing rate for a 4.8@3000
is 4.2 wc-in. For an installation at 3500 feet reduce
this pressure by 16% by setting the manifold pressure
to 4.2*.84 = 3.5 wc-in.
A manometer capable of reading to at least the nearest
0.1 wc-in will be required for this adjustment. These
can be found for less than $200 (Extech HD700).
2. Follow steps 1-6 above to optimize the outlet
temperature of the pressure washer.
Installations Above 2000 ft:
Installation at altitudes greater than 2000 ft will require
adjustments to the gas manifold pressure.
For installations above 2000 feet the firing rate should
be reduced by 4% per 1000 feet. Example: Recom-
mended firing rate for a 4.8@3000 is 4.2 wc-in. For an
installation at 3500 feet reduce this pressure by 16%
by setting the manifold pressure to 4.2*.84 = 3.5 wc-in.
This adjustment should only be made by a properly
trained service technician. A manometer capable of
reading to the nearest 0.1 wc-in will be required for
this adjustment.
In Canada, certification for installation at altitudes over
4500 feet is the jurisdiction of local authorities.
Gas Valve Replacement:
If you replace your gas valve the manifold pressure for
the new valve will need to be adjusted to match the
specification plate for the machine. Follow the instal-
lation and adjustment instructions provided with your
replacement valve. A manometer capable of reading to
the nearest 0.1 wc-in will be required for this adjustmen
CAUTION: All gas conversion must be done by a
qualified service person in accordance with these
instructions and in compliance with all codes and
requirements. In Canada, gas conversion shall be
carried out in accordance with requirements of
the Provincial Authorities having jurisdiction and
in accordance with the requirements of the CAN/
GGA-B149.1 and .2 installation code.
14
ENG • 9.801-511.0 • Rev. 9/13a