Commissioning; Servicing; Flushing And Filling; Draining - EHC NEPTUNE NINDSL90L Installation & Maintenance Instructions Manual

FLUSHING & FILLING
Check that the pressure in the expansion vessel is 3 bar
(45PSI), i.e. the same as the setting of the pressure reducing
valve. The valve is of the car tyre (Schrader) type. Check
all the connections for tightness including any factory
made connections such as the immersion heater and the
temperature and pressure relief valve. Before illing, open
the hot tap furthest away from the EHC Neptune to let air
out. Open the cold main isolation valve and allow the unit to
ill. When water lows from the tap allow it to run for a short
while to lush through any dirt, swarf or lux residue. Close
the tap and open every other hot tap in turn to purge all
remaining air.
DIRECT UNITS
After illing with water and after sterilisation liquid has
been purged, switch on the power to the immersion heaters
and allow the unit to start to heat. The immersion heater
is supplied preset at 55°C. Turning fully to + sets to approx
65°C. Allow unit to heat up, adjust the thermostat so that
the heater switches off at 60°C. Record information on
Commissioning Record (Page 19).
INDIRECT UNITS
Consult the boiler manufacturer's commissioning
instructions and ill the primary circuit. Ensure the lever on
the two port valve is set to the illing position. When full,
move the lever back. Switch the programmer to Domestic
Hot Water (DHW) and allow the unit to start to heat. Adjust
the dial of the dual thermostat to between 55°C and 65°C
GENERAL
Servicing should only be carried out by competent installers
and any spare parts used must be purchased from the Electric
Heating Company. NEVER bypass any safety devices or
operate the unit without them being fully operational.

DRAINING

Isolate from the electrical supply to prevent the immersion
heaters burning out. Turn off the boiler. Isolate the unit from
the cold mains. Attach a hose to the draining tap ensuring that
it reaches to a level below the unit (this will ensure an eficient
syphon is set up and the maximum amount of water is drained
from the unit). First open the hot tap closest to the unit and
then open the draining tap.
WARNING: WATER DRAINED OFF MAY BE VERY HOT!
IMPORTANT: After draining the cylinder do not close the hot
tap until the cylinder has fully cooled, failure to follow this
instruction may result in damage to the cylinder and will
invalidate the guarantee.
ANNUAL MAINTENANCE
The EHC Neptune requires an annual service in order to
ensure safe working and optimum performance. It is essential
that the following checks are performed by a competent

COMMISSIONING

as required. Allow unit to heat up, adjust the thermostat so
that the heater switches off at 60°C. Record information on
Commissioning Record (Page 19).
STORAGE TEMPERATURE
The recommended storage temperature for both direct
and indirect cylinders is 60-65°C. In hard water areas
consideration should be given to reducing this to 50-55°C.
In many healthcare applications the guidance on Legionella
control and safe water delivery temperatures will require
storing the water at 60-65°C, distributing at 50- 55°C
and using thermostatic mixing valves to control the inal
temperature. For details consult the NHS Estates Guidance
on safe hot water temperatures.
SAFETY VALVE CHECKS
During heat-up there should have been no sign of water
coming from either the expansion relief valve or the
temperature/pressure relief valve. Now hold both of these
safety valves fully open, allowing as much water as possible
to low through the tundish. Check that your discharge
pipework is free from debris and is carrying the water away
to waste eficiently. Release the valves and check that they
reseat properly. On Completion of commissioning, ill in the
Commissioning Record and leave with the house owner.

SERVICING

installer on an annual basis. Commonly this is done at the
same time as the annual boiler service.
1) Twist the cap of the expansion relief valve on the inlet
control set and allow water to low for 5 seconds. Release
and make sure it resets correctly. Repeat with the pressure/
/ temperature relief valve. In both cases check that the
discharge pipework is carrying the water away adequately. If
not, check for blockages etc. and clear.
WARNING: THE WATER DISCHARGED MAY BE VERY HOT!
2) Check that any immersion heaters itted are working
correctly and that they are controlling the water at a
temperature between 55°C and 65°C.
3) Check the pressure in the expansion vessel is charged to 3
bar. Turn off the water supply to the unit and open a hot tap
irst. The air valve on expansion vessel is a Schrader (car tyre
) type. Air or CO
4) Unscrew the head on the inlet control set and clean the
mesh ilter within.
5) The service history supplied with this unit should be
updated at each service.
YOUR GUARANTEE MAY BE VOID WITHOUT PROOF OF
ANNUAL SERVICING.
EHC NEPTUNE
UNVENTED HOT WATER CYLINDERS
2 may be used to charge the expansion vessel.
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