Heatrae Sadia Hotflo Quick Start Manual page 5

Accessories
A full range of accessories are available for installation with Hotflo 10 and 15.
These are supplied as accessory packs.
When installing small unvented water heaters, it is essential that the correct
accessory packs are used. The selection guides on page 4 indicates the
appropriate pack(s) for different heaters and situations.
If the expansion in the cold main is restricted, for example by a stop valve,
check valve or water meter, an accessory pack which includes an expansion
vessel must be fitted. See diagrams 2 and 3 on page 4.
A knowledge of the maximum incoming water pressure is an essential
requirement prior to installation; where this is not known the local Water
Authority should be consulted.
Pack U1 – Combined pressure reducing
valve and strainer
The pressure reducing valve limits water
pressure to 3.5 bar (50 psi).
The strainer filters coarse impurities from the
water supply.
Connection
Installation Pack U1 must be installed on the
cold inlet side of the heater and before the
expansion vessel. Where possible, installation
should be on the mains side of the cold water
tap draw-off. This will result in balanced water
supplies and is particularly important when
mixers are to be used.
Pack U1 must be used with Pack U5.
Pack U5 – Expansion vessel and check valve
The expansion vessel when fully charged, will
absorb all expanded water produced by the
Hotflo heater during normal operation.
Connection
The check valve prevents backflow of hot water
and eliminates any possibility of cross-
contamination between cold and hot water.
Connections 15mm compression.
Installation Pack U5 must be fitted on the inlet
side and in close proximity to the heater as
shown in diagrams 2 and 3 on page 4.
Pack U6 – Temperature and pressure
relief valve
The temperature and pressure relief valve is
recommended by Heatrae Sadia to give an
additional level of safety to Hotflo. It is pre-set to
open at 7 bar (101.5 psi) and 90°C. Pack U6 is
the only temperature and pressure relief valve
recommended for use with Hotflo unvented
heaters.
Connections Inlet and outlet 15mm compression
drain 1
Installation Pack U6 valve is connected to the
outlet connection on top of the Hotflo heater.
See diagram 4 on page 4.
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1 / " BSP female.
2
1 / " BSP male; precharged 4.1 bar.
2
/ " BSP female.
2
Thermostatic blending valves allow water to be stored at high temperatures
and blended with cold water to a preset outlet temperature.
This provides over-temperature protection, and is ideal for the control of
Legionellae and the extension of system capacities.
Pack U3 – TMV2
Connection 15mm compression.
Allows water to be safely stored above 60°C.
Precisely controls outlet water temperature
(range from 35°C to 60°C).
Lockable control knob.
Fail-safe shutdown.
Incorporates check valves to prevent cross
contamination.
Operating pressure from 0.2 bar to 6.0 bar.
Pack U7 – TMV3
Connection 15mm compression.
Fully approved under the TMV3 scheme to the
DO8 specification.
Allows water to be safely stored above 60°C.
Precisely controls outlet water temperature
(range from 38°C to 46°C).
Unique adjuster key to prevent unauthorised
temperature adjustment.
Fail-safe shutdown.
Incorporates check valves to prevent cross
contamination.
Operating pressure from 0.2 bar to 5.0 bar.
Installation diagram and advice
Heatrae Sadia offers a dedicated specifier advice line to provide information
and advice on specification and installation. This is supported by a fully-trained
national sales team, all of whom are qualified to provide further guidance
and support locally.
Outlet taps
Hot outlet
Blended water Pack U3 or U7
to outlets blending valve
Balanced
cold water
supply
Cold mains feed
Water
heater
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