Santon AH7/2.2 - Important Installation Points; Pressure Relief Valve Requirement; Cold Water Expansion Conditions; Expansion Vessel for Non-Compliant Conditions

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1.0 IMPORTANT INSTALLATION POINTS
1.1 The Aquaheat unvented water heater MUST be tted with a Pressure (Expansion)
Relief Valve. This MUST be tted to the cold water supply near the heater.
FAILURE 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) Backow 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 Figure 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 accomodat-
ed using an Expansion Vessel. To ensure all expansion takes place in the vessel a
Non Rerturn Valve must also be tted together with a Pressure (Expansion) Relief
Valve (see Figure 2). Use Accessory Pack ALK05 (94970012).
1.4 If the static supply pressure exceeds 4.1 bar (60p.s.i.) a Pressure Reducing Valve
must be tted to the cold main supply. If a Pressure Reducing Valve is used an
Expansion Vessel must also be used (see Figure 3). Use Accesories Pack ALK04
(94970011).
1.5 Where specications demand the tting of a Temperature/Pressure Relief Valve,
one can be tted on site (see Figure 4). Use Accesory Pack ALK06 (94970013).
Note the tting of ALK06 does not alter the requirements detailed in points 1.1 to
1.4 above.
WARNING: IF WATER FLOWS FROM THE PRESSURE RELIEF VALVE
OR TEMPERATURE / PRESSURE RELIEF VALVE (IF FITTED) THE ELEC-
TRICITY SUPPLY MUST BE SWITCHED OFF IMMEDIATELY. CONTACT
THE SANTON SERVICE TEAM (TEL: 01603 420347) OR AN APPROVED
INSTALLER.
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