The Ambi-Rad Herringbone HB combined
manifold system may consist of either ‘U’
tube or linear heaters, linked into a common
aluminium manifold system, which in
turn is coupled to one hot gas vacuum
fan to ‘evacuate’ the products of
combustion to atmosphere via a flue
system.
This document should be used in
conjunction with the specific product
installation manual i.e AR or Optima Series.
Please refer to the design manual 042/93
to ensure correct manifold design.
The following appliances are tested and
certified by an accredited test house for
use on natural gas and propane:
AR Series BG/EC – 87/95/214
Optima BG/EC – 87/95/308
The system is controlled via an Ambi-Rad
black bulb thermostat whose controller
is housed in a lockable cabinet with fan
starter for Type ‘0’ fan only and time switch.
The Ambi-Rad Herringbone HB combined
manifold system layout should be designed
to be as compact as possible with the final
connection to the hot gas vacuum fan
approximately central in the manifold
system. Please refer to document Ambi-Rad
Herringbone design manual 042/93.
The manifold system should be arranged
to fall slightly in the direction of the hot
gas vacuum fan. This ensures that any
condensation formed in the manifold
on cold start and cool down is not trapped
or allowed to drain back into the heater unit
and will flow towards the condensate trap
located at the vacuum fan end of the
manifold system. (See figure 8a for
condensate trap arrangement)
The exhaust flue should be adequately
supported from the building structure and
installed in accordance with the British
Standard Code of Practice – Flues for Gas
Appliances, Local and Ministry Authorities
and Building Regulations. Alternatively, a
telescopic through the wall discharge duct is
available for either Type ‘0’, or Type ‘2’ fan
(available from Ambi-Rad).
Ambi-Rad will, upon receipt of a proposed
drawing showing a Herringbone system,
check the pressure drop of the manifold
system to ensure it does not exceed the hot
gas vacuum fan design criteria.
1.1 Standards
The Ambi-Rad heater must be installed
in accordance with the relevant
provisions of the Gas Safety
(Installations and Use) Regulations 1984
(as amended). Due account should also
be taken of any obligations arising from
the Health and Safety at Works etc. Act
1974. In addition the installation must
be carried out in accordance with the
current I.E.E. Regulations. The Building
(Standards) (Scotland) Consolidation
Regulations, the requirements of BS
5440:Part 1:1990, BS 6891:1998, BS
6896:1991 and any other relevant British
Standards and Codes of Practice.
1.2 Ventilation requirements
Permanent ventilation is required as
follows:
Natural ventilation
(preferably at low level)
Up to and including 60kW - 4.5cm
2
/kW,
over 60kW - 270cm
2
+ 2.25cm
2
/kW
in excess of 60kW total input.
Forced ventilation
Minimum proven air flow –
2.35m
3
/h per kW of total rated input.
For detailed information please refer
to Ambi-Rad design manual and/or
BS 6896:1991, Installation of Gas Fired
Overhead Radiant Heaters for Industrial
and Commercial Heating.
1 General arrangement of
Ambi-Rad Herringbone
2
