The Vectaire WHHR125DC works by extracting stale polluted air from rooms where most moisture is
generated and providing fresh pre-warmed air taken from outside the house and delivering it to other
rooms, creating a flow of fresh, clean air throughout the house.
Most of the heat reclaimed from the extracted air is used to pre-heat incoming fresh air by means of a
“heat exchanger” built into the unit. The ventilation system operates continuously so the air remains free
from harmful pollutants and excessive moisture, but without wasting heat or energy unnecessarily.
The air travels from terminals built into the ceiling which are connected by hidden ducts to the unit. The
unit is usually installed in a roof space or cupboard.
Each unit is commissioned individually so the amount of air moved is set to suit the specific size and style
of the house. Most systems will also have a facility to boost the extraction rate at times when more
moisture is being generated, such as when bathing or cooking. This may be done automatically by elec-
tronic sensors or by a conveniently located boost switch for manual operation.
DO NOT switch off the unit; it is designed to run continu-
ously and should not be switched off, except for mainte-
nance or filter replacement. It is important to follow the
advice in this user manual and correctly maintain the sys-
tem to ensure a healthy indoor environment.
If a boost switch has been installed, it can be used to increase
the extract ventilation rate at times when moisture or pollu-
tant levels are considered excessive. The unit has an integral
over-run timer and will continue at boost speed for a short
period of time (set at installation) when the boost switch is
moved back to the off position.
You may have electronic sensors which detect high levels of moisture and pollutants which boost the
system automatically.
All whole house ventilation units require periodic maintenance and this must only be carried out
by a suitably qualified and competent person. See the servicing and maintenance section for
further details.
Features of the Vectaire WHHR125DC
• Easy installation mounting bracket.
• Standard 15mm fitting for condensate drain connection.
• Quick commission setting with 5 or 10 minute boost delay.
•
Full commission setting for ultimate efficiency with 5, 10, 15 or 20 minute boost delay.
• The duct ports accept 100 and 125mm diameter ducting.
• Frost protection ensures that low temperatures do not affect
the efficiency.
• The boost speed can be triggered by:
- a remote switch/pull cord (a volt free contact switch)
(not supplied)
OR
by any of the following when used with an intermediate,
external relay (available separately - please contact Vectaire
Technical Dept for further information on the use of this):
-
PIRFF (passive infra red)
-
DRH240 (dynamic remote humidistat)
-
THM (thermostat)
-
a light switch (if more than one light switch is used,
each
one must be a double pole switch)
Page 4
How the system works
System Layout 1
System Layout 2
