Section 1: Introduction
Page 4
1.1 GENERAL
A ‘volumiser’ is simply a vessel used to increase the volume of the
heating system connected to the heat pump. It has one inlet and
one outlet for connection to the heat pump and heating system.
The Grant External volumiser can be used in the following
situations:
a) Where there is insufficient water volume in the heating
system connected to the heat pump.
b) Where there is no available space inside the property to
accommodate a volumiser/low loss header, such as the
Grant combined volumiser/low loss header.
c) When a plate heat exchanger is used to provide hydraulic
separation between the heat pump and the heat emitter
circuits.
The Grant External 30 litre volumiser is an insulated rectangular
tank fitted with a single 3kW electric immersion heater and is
designed for use with the Grant Aerona³ air source heat pumps.
This is housed within a weatherproof external casing with a
removable cover at one end to access the electrical connections
and immersion heater.
It is designed to be located behind the Aerona³ heat pumps, on
the same anti-vibration mounts (Grant product code: HPIDFOOT/
KIT2) as the heat pump, using the mounting brackets provided
with the volumiser. See Figure 1-1.
1 INTRODUCTION
Figure 1-1:
Grant External Volumiser behind Aerona³ heat pumps
HPID13R32 & HPID17R32
HPID10R32
HPID6R32
! NOTE !
This volumiser is designed to be installed in the flow from
the heat pump.
The volumiser has two pipe connections located on the upper
surface of the unit. Refer to Figure 2-1. These are 28mm
compression connections. Refer to Section 3.6 for further details
on the connections to the external volumiser.
The flexible hoses supplied with the Grant Aerona³ will be used to
connect the External Volumiser to the heat pump.
The 3kW electric immersion element is supplied, factory fitted
and located inside a removable panel at the right-hand side of the
volumiser (viewed from the front).
It is intended to provide a backup heat source controlled by the
Grant Aerona air source heat pump to which it is connected. Refer
to Section 4 – Electrical.
The shell of the volumiser is a mild steel welded construction,
insulated with mineral wool. This is enclosed within an outer
galvanised steel casing with a powder coated paint finish to match
the casing of the heat pump.
The volumiser is fitted with a ½” drain cock, located to the left of
the immersion heater, to allow the volumiser to be drained down if
required.
! WARNING !
The immersion heater must NOT be used unless it is fully
immersed in water. Always ensure that the electrical supply
to the volumiser/immersion heater is isolated BEFORE
draining down the volumiser.
Always ensure that volumiser is fully refilled with water
BEFORE switching the electrical supply back on
1.2
PRODUCT CONTENTS
The Grant External Volumiser is supplied as a pack, in a box,
containing the following items:
•
1 x External Volumiser c/w immersion heater
•
2 x Mounting Brackets
•
1 x Cable gland M20mm
•
1 x Cable gland M16mm
•
1 x Installation instructions
1.3
PIPE FITTINGS FOR HPID6R32 ONLY
As the INLET on the top of the external volumiser is higher than
the flow connection on the back of the HPID6R32 heat pump, an
elbow with an integral manual vent must be fitted to the volumiser
inlet to allow the volumiser to be vented of any air. Refer to Figure
3-8.
The necessary 22mm compression elbow with integral manual
air vent is supplied with the heat pump for this connection
arrangement.
Two 28mm x 22mm compression reducing sets are also supplied
with the heat pump. These to allow 22mm pipe to be connected to
the 28mm inlet and outlet connections on the external volumiser.
Refer to Figure 3-9.
