andrews NEOflo SC25/200, Installation, Operation And Maintenance Manual

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NEO fl o Water Heater 20 September 2015
Fig 8.2
Throttle
Adjustment
Fig 8.1
COMMISSIONING
After installation of the water system, open the main
water supply valve,
fl ush the system and fi ll the heater.
FILLING
1. Check that the tank drain connection is fi tted and
closed.
2. If the appliance is connected to a hot water recir-
culation system, open the isolation valve immedi-
ately before the connection point to the tank.
3. Turn on all the hot water draw off taps.
4. Turn on the cold water supply and
fi ll the heater.
5. Close each hot water draw off tap when water is
discharged.
6. After initial fi lling open each hot water draw off
tap in succession and check that all the air is
vented from the system.
7. Check for leaks
STARTING THE APPLIANCE
Plug the appliance in at the wall socket or turn on the
switched spur supplying the appliance.
Th e appliance is
fi tted with a fully automatic ignition and temperature
control system. Once set in operation the appliance
will require minimal attention.
On/Off switch
Turns the appliance on. Th e appliance will start if
tere is an external demand, if the link wire has been
replaced by a remote switch, and the temperature of
the water in the tank is lower than the setpoint.
When the Heater is in standby mode a symbol is
shown on the display.
When the Heater has ignited a fl ame is shown on
the display.
Set the Tank Temperature
In standby the display shows the temperature of the wa-
ter in the tank. Press the + or - button and the setpoint
temperature is shown and can be altered to the desired
fi gure between 45 and 70°C
Th e burner will ignite automatically after a short initia-
tion period, indicated by Flame graphic on the display.
If the burner does not light, a Lockout error number, and
RESET will be displayed. If the Error is “1”, it is possible
that the gas supply has not been purged suf
fi ciently.
Reset the lockout condition by using the reset button
(Fig.8.2) and repeat the operation.
Once the main burner has ignited it will operate con-
tinuously until the required water temperature has been
obtained.
COMMISSIONING THE BURNER
Th e Heater gas rate is factory set however it is an impor-
tant part of comissioning that the combustion settings
are checked.
1. Remove the Lower Front Panel.
2. Switch on the Heater and allow three or four min-
utes for the Heater to warm up before checking the
combustion.
3. Remove the Access Plug in the Sump and push the
probe of a combustion analyser fully in.
4. Th e CO
2
fi gure should be as shown in the data table
on inside of the cover of this manual. If adjustment
is required, pull off the cover from the
Th rottle Screw
and adjust. Screw clockwise to reduce CO
2
, anti-
clockwise to increase the CO
2
. Fig. 8.1
5. When correct replace the cover over the Th rottle
Screw and replace the lower front panel.
Throttle adjustment