Introduction - Vent-Axia HR25H Installation And Wiring Instructions

1.0 Introduction

1.1 Description
1. The Vent-Axia HR25 range of products are
"through the wall" heat recovery ventilators for
use in areas such as bathrooms and WCs.
2. The units are fitted with a 24V DC motor and
are supplied with a Switch Mode Power Supply
(S.M.P.S.). On normal setting the power
consumption is 2 Watts.
A 5m cable is provided for fixed wiring of the
unit to the S.M.P.S.
3. The twin impeller and heat exchanger
arrangement simultaneously supplies and
Fig. 1
extracts air while transferring heat from the
stale exhaust airflow to the fresh intake airflow.
This provides up to 84% heat recovery from the
stale extracted air.
4. The range of products is as follows:-
HR25
The HR25 is fitted with a pull cord switch which
provides a twin speed control function.
HR25H
The HR25H is fitted with an adjustable humidity
sensor which automatically switches between
its high and low settings depending on the
relative humidity in the room of installation.
HR25P
The HR25P has an Infra-Red sensor which
detects a person moving in the room, which
then activates the unit to switch to its higher
setting. This unit can operate under two different
modes, direct action and delayed action.
HR25L, HR25LH and HR25LP
These are extended versions of the above
models. They are designed for installations
where the wall thickness is between 311mm
and 425mm.
3