Temperature Adjustment Procedure; Legionella Prevention - Lochinvar ECOKNIGHT EKW46CE Installation Manual

17.4.3
PROCEDURE FOR INITIAL LIGHTING
IF THE UNIT IS TO OPERATE ON LPG REFER TO SECTION 18.0 BEFORE PROCEEDING
1. Ensure that the external gas-inlet appliance isolating valve, provided by the installer, is in the "off" position.
2. Press the power rocker switch, positioned on the back of the appliance to bring the equipment on.
3. The combustion fan should ramp up to full speed to purge the combustion chamber and then drop back to half rate in order
to light. The spark generator should create a spark, visible through the burner sight glass. As the gas-inlet appliance
isolating valve is closed, the controls should go to a flame failure condition after four ignition attempts (EKW46CE –
EKW116CE) or two ignition attempts (EKW146CE – EKW236CE). If the above occurs correctly, open the gas-inlet
appliance isolating valve and reset the unit by depressing the Enter/Reset button on the control panel.
4. The combustion fan will repeat the pre-purge procedure and attempt to light. Once a flame is established, the LCD display
will change to display the rate at which it is firing.
5. Allow the system to reach temperature to check operation of the control sensors.
6. Once the appliance has reached temperature and shut down, check that the flame has extinguished.
17.4.4
GAS PRESSURE ADJUSTMENT AND COMBUSTION CHECKS
The Lochinvar EcoKnight™ series are supplied with a pre-set gas/air ratio inlet assembly. This must
not be tampered with. Any attempt to adjust the gas valve or venturi will invalidate the warranty.
Combustion figures should be as follows:
Model No.
EKW46CE
EKW61CE
EKW86CE
17.4.5
NATURAL GAS COMBUSTION FIGURES
If the combustion figures are not within the range specified, contact Lochinvar Technical Support for further guidance.
Combustion figures for Propane firing can be found in Section 18.0: LPG FUEL.
17.5

TEMPERATURE ADJUSTMENT PROCEDURE

17.5.1
DHW SETPOINT
The set point should be adjusted to ensure that the water is stored above 60°C and distributed at 50°C within 1 (one) minute at all
outlets. Care is needed to avoid much higher temperatures because of the risk of scalding. At 50°C the risk of scalding is small for
most people, but the risk increases rapidly with higher temperatures and for longer exposure times. The risk to young children and
to those with a sensory or mobility loss will be greater. Where a significant scalding risk has been identified, the use of thermostatic
mixing valves on baths and showers should be considered to reduce temperature, this need to be placed as close to the point of use
as possible.
17.6

LEGIONELLA PREVENTION

During normal use the EcoKnight™ water heater and direct storage vessel should not pose a Legionella risk providing the vessel
temperature setting is at 60°C or above. See Section 21.4.1. The cold feed is fed into the flow and return pipework between the
EcoKnight™ water heater and direct storage vessel to prevent cold spots on the base of the direct storage vessel. Also the large
high flow shunt pump supplied with each EcoKnight™ water heater prevents temperature stratification within the direct storage
vessel.
CO
2
9.0% 0.5%
9.0% 0.5%
8.8% 0.5%
CO
<100 ppm
<100 ppm
<100 ppm
63