Instant Hot Water Response
-
Instant water response is guaranteed by keeping heat
(supplied by the district supply) close at hand to the HIU at all times. At regular intervals
(factory set to 20 minutes), the controller opens (factory set to 2 min) the PICV to deliver a
low flow of about 100 l/hr, then closes the valve again. This repeats whenever the HIU is on
standby when there is no demand.
OPTIMISED HEATING CONTROL
-
return temperatures are monitored and controlled.
The controller of the HIU uses this information to maintain the optimum flow temperature
and keep the DISTRICT return temperature as low as possible.
This can be seen on the display screen as AUTO and is the factory setting.
DHWS Priority
-
DHWS is the priority operation of the HIU. A flow switch detects the
demand and the HIU (if in heating mode) switches to DHW production. Even if the heating
system is in fault mode, the HIU will still produce DHWS.
High DHW temperature safety.
If for whatever reason un
-
managed hot water at extreme
temperature were to pass through the PHE, there is a thermostatic limiting valve on the DHW
exit. This is locked and factory set to 57C. Being non electric this still maintains the safety
feature even when electric supply to the HIU is cut.
Low Pressure protection for the HIU
.
Low pressure switch will stop the circulating pump
should the secondary system drop below 0.7bar. The HIU is fitted with a Safety Relief valve
set at 3 bar for high pressure protection.
Underfloor Heating
-
the unit is fully compatible with low temperature systems.
The installer simply sets the required value for temperature on installation.
Insulation
-
the HIU casing panels are all fully insulated including the back
-
plate to prevent
overheating of the surrounding area
.
Prepayment Billing
can be accommodated with an accessory kit to shut down the unit when
the tenant is no longer in credit.
Security
-
the metal casing can be closed to prevent unauthorised tampering with
optional fixing bolts on request.
The HIPER HIU has been independently tested and proved, and conforms to
BS EN13203
-
01
-
for appliances producing hot water.
Integral Flushing Bypass, if cleaning the system with the HIU
Installed, or First Fix Jig and bypass pipe accessory if the
HIU is to be fitted last, after primary flushing.
SECTION 2
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Description FEATURES continued
09/17 E & OE
Summary of Contents for Hiper Xi45 INDIRECT HIU 45DHW/10HTG
Page 28: ...09 17 E OE ...
