9
3.8 Pipe installation
The product is designed to be permanently
connected to the mains water supply.
Approved pipes of the correct size should be
used for installation. The relevant standards and
regulations must be followed.
3.8.1 Incoming water pressure
The efficiency of the product depends on the in
-
coming cold water pressure. The water pressure
should be min. 2 bar and max. 6 bar throughout
the day. Excessive water pressure can be adjust-
ed by installing a pressure reduction valve.
3.8.2 Connecting pipes
Pipes of suitable size and quality should be run to
the connections on the product and fixed with a
suitable sealant.
A safety valve of the approved type (see page 3)
should be fitted in the heating circuit (not sup
-
plied). The safety valve should not be plugged or
blocked. Any overflow pipe from the safety valve
must be clear, undamaged and frost-free with a
fall to the drain.
3.9 Positioning the unit
The water heater should be fitted level on a hard
surface with sufficient load strength to take the
full weight of the cylinder (see technical data ta-
ble page 12). There are no limitations regarding
the fitting distance from walls etc., but it is strong
-
ly recommended to ensure easy access to all
pipe fittings etc. The Temperature and Pressure
relief valve and immersion heater are positioned
at 90° apart. The DELTA Twin Coil VIP cylinder
must be positioned to ensure that the tundish is
visible and there is easy access to the thermostat
and to remove the immersion heater if required.
3.9.1 Protection from frost
If the water heater is in danger of being exposed
to frost while not operating under electric power,
the unit must be drained to avoid damage. Make
sure the electric power is turned off before drain
-
ing, otherwise the heating elements can be dam-
aged and the warranty is void. Draining instruc-
tions, see “Draining ” on page 5.
3.9.2 Cold water supply
1. To obtain the best performance from your
OSO unvented system it is advisable to feed
the unit with an uninterrupted supply.
2.
Before connecting to the multibloc, flush the
cold supply pipework of all flux and debris.
3. Locate the water heater in a suitable posi-
tion to facilitate the installation of the cold
water supply, discharge fittings and pipe
-
work. Also take into account access to the
immersion heater.
4. Fit the combined male elbow drain cock to
cold supply point (14), so that the compres-
sion fitting is vertical.
5. Fit the length of copper tube 22 mm speci-
fied in Table 1 to the cold feed elbow (see
pt. 4 above).
6. Fit the Multibloc (5) to the top of the copper
tube (see pt. 5 above).
7. Connect 15 mm copper tube from the ex-
pansion relief valve (4) and also from the
T&P valve (5) and join together in a Tee as
shown on page 8.
8. Fit the tundish (8) to the bottom connection
of this tee.
9. Connect the cold supply to the multibloc (5).
10. Fit the expansion vessel to the wall close to
the water heater using the enclosed mount-
ing bracket. Connect the expansion vessel
to the multibloc, as shown on page 8.
3.9.3 Hot water supply
Connect the hot water supply pipe to the outlet
(13). Ensure connection is water tight.
3.9.4 Balanced cold water supply (optional)
If no balanced cold supply is required, tighten
the supplied blanking cap. If a balanced mains
pressure cold water supply is required to a
shower or bidet (over rim type only, ascending
spray type requires type AA,AB or AD air gap),
remove blanking cap and connect to the shower
or bidet cold supply on the multibloc valve (5).
(Major shower manufacturers advise fitting a
mini expansion vessel in the balanced cold sup-
ply pipework to accommodate thermal expan-
sion and prevent tightening of shower controls)
Using the balanced cold connection to feed bath
taps can reduce the flow available to the unvent
-
ed cylinder.
3.9.5 Secondary return (optional)
Connect secondary return if required to fitting
(18) page 8, see technical data table on page
??
Summary of Contents for Delta Twincoil DTC 200
Page 26: ...26 NOTES ...
