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19 COMMISSIONING THE WATER HEATER
First: flushing the water heater with water
After installation of the water heater the first step, before commissioning, is to flush the water heater and the
whole installation with fresh water to remove pollution, debris and other materials that might cause a blocking.
This must also be done with installations, where only the water heater is replaced.
Existing and new systems must be cleaned with a hydronic system cleaner. System cleaner must be drained and
thoroughly flushed with clean water to remove any residual cleaner, prior to installing a new water heater.
NEVER leave a system cleaner in the heating system for longer than recommended by the manufacturer of the
cleaner. Never put system cleaner inside the water heaters heat exchanger.
Second: filling & venting the water heater and the system
After flushing the water heater and the installation the system can be filled with fresh water.
The water heater has an automatic air vent situated inside the water heater. This vent is always open and the
venting outlet goes via a plastic tube through the bottom to the outside.
During the commissioning, make sure no water can enter the water heater and make contact with the electrical
parts.
Third: check the water flow
Before starting the water heater ensure the pump is installed and operating correctly and that there are no ob-
structions or closed valves that could prevent water flow through the heat exchanger.
NOTICE:
Always ensure the water heater pump is functioning correctly and that there is flow through the heat ex-
changer after working on the water heater or system.
Warning:
There must be a Flowswitch fitted to the water heater connected to terminals 16-17 and adjusted to ensure
it only allows the water heater to fire on full flow.
Failure to install a flow switch and commission correctly will invalidate all water heater warranties
Mounting Condensate Trap
When mounting the bottom part of the condensate trap, before commissioning the water heater and/or after
maintenance, it must ALWAYS be completely filled with water.
This is a safety measure: the water in the condensate trap keeps the flue gases from leaking out of the heat
exchanger via the condensate drain.
WARNING
108
The condensate trap must al-
ways be filled to the edge with
water, before replacing to the
unit.
E93.1804.014
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