Technical Specifications; Important Installation Points - Heatrae Sadia HOTFLO Installation And User Instructions Manual

Please read and understand these instructions prior to installing your Hotflo unvented
water heater. Particular attention should be paid to the section headed IMPORTANT
INSTALLATION POINTS. Following installation and commissioning the operation
of the heater should be explained to the customer and these instructions left with
them for future reference.

TECHNICAL SPECIFICATIONS

Electrical rating ................................................... 2.0/2.2kW 230/240V
Capacities ............................................................ 10 or 15 litres
Weight (full) ........................................................ 10 litre - 16.5kg
............................................................................. 15 litre - 23.4kg
Rated pressure ..................................................... 6 bar
Minimum recommended supply pressure ........... 0.8 bar
Temperature/Pressure Relief Valve ..................... 90

1.0 IMPORTANT INSTALLATION POINTS

1.1 The Hotflo unvented water heater MUST be fitted with a Pressure (expansion)
Relief Valve. This MUST be fitted to the cold water supply near the heater. FAIL-
URE TO PROVIDE ADEQUATE PRESSURE RELIEF WILL INVALIDATE ANY
GUARANTEE AND LEAD TO A DANGEROUS INSTALLATION
1.2 Expansion can take place within the cold water supply PROVIDED THAT BOTH :
(a) Backflow in the main is not prevented by any stopvalve with loose jumper,
check valve, pressure reducing valve or similar, AND
(b) Hot water expansion does not enter a branch to a cold water outlet (see Diagram
1 for expansion pipe lengths).
N.B. Both the above conditions must be met. Additionally expansion within the cold
water supply will not be possible if the static supply pressure exceeds 4.1 bar
(60p.s.i.).
1.3 If any of the conditions in 1.2 above cannot be met expansion must be
accomodated using an Expansion Vessel. To ensure all expansion takes place in the
vessel a Check Valve must also be fitted (see Diagram 2). Use Accessory Pack U5
code no. 95 970 356.
1.4 If the static supply pressure exceeds 4.1 bar (60p.s.i.) a Pressure Reducing Valve
must be fitted to the cold main supply. If a Pressure Reducing Valve is used an
Expansion Vessel must also be used (see Diagram 3). Use Accesory Packs U1 and
U5 code no.'s 95 970 352 and 95 970 356.
1.5 Where specifications demand the fitting of a Temperature/Pressure Relief Valve one
can be fitted on site (see Diagram 4). Use Accessory Pack U6 code no. 95 970 359.
NOTE the fitting of Pack U6 does not alter the requirements detailed in points 1.1
to 1.4 above.
2
o
C/7 bar