andrews R18 Series, Техническая документация инструкция

Страница: 31 / 71

18IP22B
23
Fig. 19 Support flow and return pipes
5.2.3 Hydraulic connections
Pump switching
The water heater’s circulation pump must be in operation be-
fore the water heater is switched on. When the water heater is
switched off, the circulation pump should continue to run for
several minutes in order to reduce the amount of heat present
in the water heater. If the pump is switched off too soon, the
water temperature can rise above the maximum water tempera-
ture, as a result of which the maximum thermostat will cause
the water heater to fall into "Lock-out".
The product has to be installed by a recognised installer fully
according to the current national and local requirements, norms
and standards.
The cold water feed, recirculation and hot water flow are found
on the side of the water heater. As standard all water heater
types are fitted with a safety valve,
set to 5 bar .
If requested the manufacturer can also safety valves which are
set to between 5 and 8 bar. For the dimensions see Technical
data table.
The water connections are found as standard on the right-hand
side of the water heater, an alternative left-handed version is
optional.
Fill and drain cocks are standard.
It is necessary to support the unit’s flow and return pipes.
To ensure easy disassembly and reassembly, a removable
spacer-pipe should be mounted to the unit’s flow and return
pipes as shown in figure below.