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Section 1: introduction
Page 5
1.6 oPEn VEntEd Hot WAtEr
SYStEmS
If required, your MonoWave HP cylinder with buffer can be used
as part of an open vented hot water system, i.e. fed from a cold
water storage cistern and fitted with an open vent pipe, provided
the maximum head does not exceed 30 metres.
When used in this way, it will not be necessary to install the
expansion vessel and cold inlet manifold supplied with the
cylinder.
! notE
!
the temperature and pressure relief (t&P) valve must be
left connected to the cylinder (as supplied).
As it may still operate due to temperature, it should be connected
in the correct manner - refer to guidance given in Section 4 of
these instructions.
1.7 PrimArY circUit PiPEWorK
connEctionS
All primary circuit pipework connections to the cylinder MUST be
made in accordance with Figures 3-1 to 3-6 as appropriate. Refer
to Section 3 (Primary Circuit Installation).
1.8 cYLindEr BY-PASS
When Grant Aerona³ HPID13R32 (13kW) or HPID17R32 (17kW)
heat pumps are used with the ‘standard’ version of this cylinder,
a simple by-pass MUST be fitted between the primary flow and
return pipes at the cylinder. This by-pass consists of a 22 mm pipe
fitted between the primary flow and return pipes fitted with a 22
mm gate valve.
The pre-plumbed version of the cylinder is supplied with a factory
fitted coil bypass, fitted between the primary flow and return pipes
(below the heating zone valves).
This by-pass must be set during commissioning. Refer to Section
6.7 of these Installation and User Instructions.
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!
A by-pass at the cylinder, as described above, is not
required for the Grant Aerona³ HPid6r32 (6kW) or
HPid10r32 (10kw) heat pumps, but onLY when the Grant
Aerona³ HPid13r32 (13kW) or HPid17r32 (17kW) heat
pumps are used with this cylinder.
1.9 SEcondArY circUit PiPEWorK
connEctionS
All secondary circuit primary pipework connections to the
cylinder MUST be made in accordance with Figures 2-3 or 2-4 as
appropriate. Refer to Section 4 – Secondary Circuit Installation.
1.10 tAPS And fittinGS
All taps and fittings incorporated in the unvented hot water system
should have a rated operating pressure of 7 bar or above.
1.11 HArd WAtEr ScALinG
If the cylinder is used in a hard water areas scaling will form
inside the cylinder and this will reduce both the performance and
working life of the cylinder.
Where the total hardness exceeds 125 ppm a high capacity water
softener, or suitable water conditioner, should be installed in the
incoming cold water supply to the cylinder.
It is recommended that the water temperature control thermostats
(on the immersion heaters and dual thermostats) fitted to the
cylinder be set no higher than 60°C.This will help reduce the
migration of suspended solids in the water and help minimise the
build-up of lime scale .
1.12 inSULAtion
All Grant Cylinders are insulated with 40mm thick CFC/HFC free,
fire retardant, polyurethane foam injected between the stainless
steel cylinder and the outer casing. This polyurethane foam has
a Global Warming Potential (GWP) of less than 3 and an Ozone
Depletion Potential (ODP) of 0.
1.13 HEALtH And SAfEtY
The information supplied in Table 2-1 will help you assess the
safest way to manoeuvre your cylinder into position.
Please use the table to find the empty weight of your cylinder and
then consider how you can safely move it into its final position.
Please leave these Installation and User Instructions with the
householder after installation.