Dielectric Joint (Not Supplied With The Appliance); Condensate Drain Tubes (Not Supplied With The Appliance); Ptr Valve (Supplied With The Appliance) - Bosch Compress 3000 DW FOO Installation Instructions Manual

4.4.2 Dielectric joint (not supplied with the appliance)

Different metals between plumbing and tank materials and
additionally the effect of hot water can cause the corrosion of
one of the metals (generally the one in the tank is the metal
attacked).
The Dielectric Joint will basically avoid any physical contact
between the two metals, acting as an effective insulator and
prevent this attack. How quickly this, or if at all, this happens
depends a lot on the content of your water; its pH, the dissolved
minerals and the metals involved.
BOSCH therefore advises the use of the dielectric joint, that is
to be installed between the house piping and the tank water
connections.
4.4.3 Condensate Drain Tubes (not supplied with the
appliance)
This unit has an integrated condensation tray. The water
collected in the tray drains out of the tube coming off the back
of the unit. It is important that a hose is attached to the drain
port at the back of the unit.
▶ Attach one end of the condensate drain pipe(15mm inner
diameter recommended) to the drain port at the back of
the unit.
▶ Direct the other end to a drain in the floor or no higher than
8 cm above the ground in an outdoor installation.
If such drain is unavailable, a condensate drain pump (not
provided) must be purchased and installed.
Fig. 10
Compress 3000 DW FOO
6720808869-08.1V

4.4.4 PTR Valve (supplied with the appliance)

A temperature and pressure-relief valve is supplied and must
be installed in the tank port marked for this purpose. No valve
or accessory of any type should be installed between the relief
valve and the tank. Please observe local codes for the correct
installation of relief valves.
WARNING:
The pressure rating of the relief valve must
not exceed 1000 kPa, the maximum working
pressure of the water heater as marked on
the rating plate.
WARNING:
Relief valve easing gear should be operated
AT LEAST ONCE EVERY SIX MONTHS. If
water does not discharge freely when the
lever is operated, the valve should be
checked by an authorized agent.
WARNING:
The relief valve and relief valve drain pipe
must not be sealed or blocked. Small
amounts of water may leak from relief valve
during heating cycles.
WARNING:
Relief valves should be checked every six
months, or replaced at intervals not
exceeding 3 years or more frequently in
areas where there is a high incidence of
water deposits.
WARNING:
The function of the temperature and
pressure relief valve once installed on this
water heater is to discharge high
temperature water under certain
conditions. Therefore it is strongly
recommended that the pipe work connected
to the relief valve is able to withstand water
temperatures exceeding 99 °C. Failure to
follow this recommendation may result in a
dangerous situation.
The kW rating of the relief valve must be higher than 6kW, to
ensure that is always above the maximum output power of the
Installation instructions | 17
6 720 808 869 (2014/06)