INSTRUCTIONS FOR COMMISSIONING
SECTION 5
32
FILLING THE
WATER HEATER
1. Check that the tank drain tap is closed.
2. Check that the return valve in the 28mm pipe (close to the drain tap) is open.
3. Open the main water tap and then all warm water drainage points, so that air present
in the installation and water heater can escape.
4. Fill the water heater by turning on the cold water supply tap. The water heater is full
once water is flowing out of all the warm water drainage points.
WARNING: IMPORTANT LPG NOTICE
To commission on Propane turn the high setting screw completely clockwise
on each burner before starting the heater. Then start up each heater and turn
the high setting screw anti-clockwise until the burner ignites, then proceed
as per the following instructions.
1. Before the water heater can be used it must be checked that:
•
the water heater is completely full of water
•
the gas pipes have been purged
•
the electricity supply to the appliance is switched on
•
the phase and neutral are correctly connected to the appliance
2. Open the appliance's gas tap.
3. Switch the electricity on with the power switch on the control panel.
The water heater now searches for what burner modules are present. When these are
detected the green LED for the corresponding burner module begins to flash. When all
burner modules have been detected they are started up one by one. When the burner
module is operational the green LED is lit permanently.
The correct proportion of gas and air
can be controlled based on the CO
2
percentage in the flue gasses. This
control needs to be done at full load
and low load. Every burner module
has a CO
2
measuring point for the
measurement, see Fig. 9. Table 1
shows the value of the CO
2
percentage at full load and low load.
Table 1. CO
2
percentage
Gas Type
Full load
Low load
Natural Gas
8.8%
8.3%
Propane
9.8%
9.2%
COMMISSIONING
CO
2
ADJUSTMENT
Fig. 12
Measuring point
MAXXflo_Manual_Dec08_QX2 12/1/09 1:13 pm Page 35
Summary of Contents for CWH120/200
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