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Section 1: Introduction

Page 4

1.1 General

The Grant VortexAir Hybrid is a unique combination of a Grant
VortexBlue oil-fired boiler and a Grant Aerona³ inverter driven heat
pump.
It is available in two models – HPIDAIR (15/21kW) and HPIDAIR2
(21/26kW). The outputs indicate the size of the range-rated blue
flame boiler used, either 15/21kW or 21/26kW. A 16kW Grant
Aerona³ heat pump is used in both models.
The Grant VortexAir is supplied in two parts, the oil boiler and the
heat pump (each on their own pallets), for connection together by
the installer on site.
It also possible to purchase the boiler only. This can be installed as
an immediate replacement for an existing boiler, with the Aerona³
HPID16 heat pump being purchased and added at a later date.
Alternatively, the boiler can simply be installed and used as a 'stand-
alone' boiler with no heat pump fitted, if required.
Both parts of the Grant VortexAir Hybrid have are housed in a
powder coated galvanised steel weatherproof enclosure.
The Aerona³ heat pump is designed to be installed externally in a
suitable position, either against a wall or some distance away from
the property as required. Refer to Section 2.7 for guidance.
The boiler unit can be installed either:
a) Externally – located next to the heat pump

b) Internally – connected through the wall to the heat pump
The Grant low level balanced flue system (Yellow system) must be
used with the VortexAir. This is supplied with the unit.
The Grant VortexAir is only suitable for use on sealed central heating
systems. Refer to Section 10.
Both models are supplied with the control panel, burner and hybrid
system pipework/valves factory fitted.

1.1.1 How it Works

The Grant VortexAir Hybrid combines the Grant Aerona³ air-to-water
inverter driven air source heat pump and the innovative VortexBlue
high-efficiency oil boiler.
The VortexAir Hybrid control system allows the Aerona³ heat pump
to operate as the primary heat source for the majority of the heating
season, thus achieving the fuel efficient and cost effective provision
of space heating.
The oil boiler will only be operated when the ambient air temperature
falls to a level where the heat pump cannot either sustain the
required flow temperature for the system, or when the heat demand
cannot be met by the heat pump at the set flow temperature.
The ambient air temperature is monitored by the air thermostat
incorporated in the control system. The two-stage air thermostat
operation allows either partial use of the boiler (to back up the heat
pump) or full operation of the boiler, under control of the boiler
thermostat controller, under the most extreme low temperature
conditions.
The air thermostat settings will vary from one installation to another.
These are critical for the correct and efficient operation of the Hybrid
unit and must be determined by using the Grant Hybrid Calculator
(available as a download at www.grantuk.com). The resulting values
for both the Air thermostat controller and Boiler thermostat controller
are set during commissioning. Refer to Section 12.
For further details on the operation of the Grant VortexAir Hybrid
refer to Section 15 (Operation).

1 Introduction

1.2 Outputs

There are two models in the VortexAir range as follows:

Table 1-1:

Hybrid product codes

Product code

Components

Output

HPIDAIR

Boiler:

Flue:

Heat Pump:

15/21kW (factory setting 21kW)

EZ90 (included)

16kW*

HPIDAIR2

Boiler:

Flue:

Heat Pump:

21/26kW (factory setting 26kW)

EZ90 (included)

16kW*

* 7°C air and 35°C flow temperature

Two models of oil boiler only are also available as follows:

Table 1-2:

Oil boiler product codes

Product code

Components

Output

VTXBFAIR

Boiler:

Flue:

15/21kW (factory setting 21kW)

EZ90 (included)

VTXBFAIR2

Boiler:

Flue:

21/26kW (factory setting 26kW)

EZ90 (included)

1.3 Planning Permission

Oil Boiler

Boiler installation is considered to be permitted development
and therefore, you do not need to apply for planning permission.
However, there are limitations:

•

External flues must not exceed the highest point of a roof by
one metre or more.

•

Listed buildings and property located in conservation areas
may be subject to listed building consent and planning
permission.

•

Any external flue installed on to a property located in a
conservation area must not be on the front of a property or any
part of the property that fronts a highway.

•

Any outside building that will form part of your boiler and
heating system will have to follow the planning permission
limitations of outbuildings and extensions.

Heat Pump

The installation of a heat pump on domestic premises may
be considered to be permitted development, not needing an
application for planning permission, provided ALL the limits and
conditions listed on the Planning Portal website are met.
For further information, visit www.planningportal.gov.uk.

1.4 DNO Application

An application must be made to the Distribution Network Operator
(DNO) before connecting the heat pump to the mains electrical
supply. There are six DNOs operating the electrical distribution
network throughout England, Scotland and Wales and the
application must be made to the DNO covering the area concerned.
The necessary information required to make this application
(J-forms) can be downloaded from the Grant UK website (www.
grantuk.com), completed and then submitted to the correct DNO for
the area in question.

1.5 Servicing

It is recommended (and a requirement of the product guarantee)
that the hybrid should be regularly serviced, at least once a year
and the details entered in the Service Log by the service engineer.
Refer to Section 16 (Commissioning).