Commissioning The Water Heater; First: Flushing The Water Heater With Water; Second: Filling & Venting The Water Heater And The System; Third: Check The Water Flow - Lochinvar TTW Series Installation, Commissioning And Maintenance Instructions
Floor standing gas fired condensing circulating type water heater
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18.0 COMMISSIONING THE WATER HEATER
18.1
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 DHW 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.
18.2
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 by opening the water supply valve of the system
and opening all the taps that are on the system. The water pressure of the system should be between a minimum of 1 bar and a maximum of 8
bar, also depending on the applied pressure safety valve fitted.
The water heater has an automatic air vent situated on top of the water heater (at the roof panel). This vent must be opened during the filling
of the water heater and the DHW system to make sure that no air/oxygen is trapped in the heat exchanger of the water heater. NOTICE: Check
that the screw cap has been loosened at least one twist.
Make sure that, during flushing and filling, no water can reach any electrical parts of the water heater.
18.3
THIRD: CHECK THE WATER FLOW
Before the water heater will be started it must be sure that the pump is functioning and that there is a water flow over the heat exchanger.
Check the electrical power supply of the water heater and when this is connected correctly, the display will show either of the following:
Display message
Reason
Water heater is not active. To activate the water heater press [ON/OFF] button for six
seconds.
Display message
Reason
Water heater is standby. To activate the water heater press [ON/OFF] button for three
seconds.
Activate the water heater by pressing the ON/OFF button for six resp. three seconds. After this the following display will appear:
Display message
Reason
Water heater is active, but there is no heat demand.
When no water is present in the water heater or the water pressure is too low/high, the water heater will go into lock-out and will show a
corresponding message in the display.
Display message
Reason
Water pressure is too low or too high
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