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GENERAL
mini HE --- Installation & Servicing
7
INTRODUCTION
mini HE C24, mini HE C28 and mini HE C32 are wall
mounted, low water content, balanced flue, condensing
combination gas boilers.
Central heating (CH) output and domestic hot water (DHW)
output are both fully modulating:
--- between 10.2 (34 936) and 24.6* (83 973) kW (btu/h) for
model mini HE C24;
--- between 12.1 (41 284) and 28.3* (96 488) kW (btu/h) for
model mini HE C28.
--- between 15.0 (51 180) and 32.2* (109 866) kW (btu/h) for
model mini HE C32.
* outputs for G31 (pro pane) are slightly different. See section
Boiler Data at page 4 for detailed figures.
Due to the high efficiency of the boiler a plume of water
vapour will form at the terminal during operation.
Theboilersaresuitableforconnectiontofullypumped,
pressurised sealed water systems ONLY.
AsystembypassisnotrequiredwhenTRV’sarefittedtoall
radiators (see Frame 5). The boiler incor porates an automatic
bypass.
A circulating pump, press ure gauge, safety valve and heating
expansion vessel are provided.
The CH flow temperature is controlled by a temperature
probe. In DHW mode the boiler modulates to sustain a
nominal adjustable water flow temperature of 55 ûC.
The boiler casing is of white painted mild steel with a
drop---down controls access door.
The boiler temperature control is located behind the control
panel door.
The main heat exchanger is made of copper.
The condensing heat exchanger (recuper ator) and the DHW
heat exchanger are stainless steel.
The system pipework must include drain cocks in appropriate
places. Pipework may be taken downwards.
For upwards pipework installation an additional frame
(optional) must be used (see frame 25).
OPTIONAL EXTRA KITS
Programmer Kit fits neatly within the casing. Separate fitting
instructions are i ncluded with the kit. Note. If using an
alternative programmer read Frame 33 first.
Horizontal Concentric Extension Ducts
Up to 2,7 m (8’ 10”) for mini HE C24, mini HE C28 models.
Upto1,8m(5’11”)formini HE C32 model.
Other available kits are listed in frame 9.
SAFE HANDLING
This boiler may require 2 or more operatives to move it to its
installation site, remove it from its packaging base and during
movement into its installation location. Manoeuvring the boiler
may include the use of a sack truck and involve lifting,
pushing and pulling.
Caution should be exercised during these operations.
Operatives should be knowledgeable in handling techniques
when performing these tasks and the following precautions
should be considered:
F Grip the boiler at the base.
F Be physically capable.
F Use PPE as appropriate, e.g. gloves, safety footwear.
During all manoeuvres and handling actions, every attempt
should be made to ensure the following unless unavoidable
and/or the weight is light.
F Keep back straight.
F Avoid twisting at the waist.
F Avoid upper body/top heavy bending.
F Always grip with the palm of the hand.
F Use designated hand holds.
F Keep load as dose to the body as possible.
F Always use assistance if required.
DHW OPERA TION
With no call fo r CH the boil er fires only when DHW is drawn
off. When there is a call for CH, the heating system is supplied
at the selected temperature until DHW is drawn off. The
output is then directed by the diverter valve to heat the
secondary heat exchanger and supply a maximum draw---off
of:
mini HE C24 10.0 (2.2) l/min (gpm) at 35 degree rise.
mini HE C28 11.7 (2.6) l/min (gpm) at 35 degree rise.
mini HE C32 13.1 (2.9) l/min (gpm) at 35 degree rise.
The nominal DHW temperature is 55 ûC, but water drawn off
when the boile r h as been on for central heating may be hotte r
than this, for a short period of time.
GAS SAFETY
Current Gas Safety (Installation and Use)
Regulations or rules in forc e
The appliance is suitable only for installation in GB and IE and
should be installed in accordance with the rules in force.
In GB, the installation must be carried out by a CORGI
Registered Installer. It must be carried out in accordance with
the relevant requirements of the:
F Gas Safety (Installati on and Use) Regulations
F The appropriate B uilding Regulations either The Building
Regulations, The Building Regulations (Scotland),
Building Regulations (Northern Ireland).
F The Water Fittings Regulations or Water byelaws in
Scotland.
F The Current I.E.E. Wiring Regulations.
Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.
In IE, the installation must be carried out by a Competent
Perso n and installed in accordance with the current edition of
I.S.813 ”Domestic Gas Installations”, the current Building
Regulations and reference should be made to the current
ETCI rules for electrical installation.
Detailed recommendations are contained in the following
British Standard Codes of Practice:
BS 5440:1 Flues (for gas appliances of rated input not
exceeding 70 kW).
BS 5440:2 Ventilation (for gas appliances of rated input
not exceeding 70 kW) .
BS. 5449 Forced circulation hot water systems.
BS. 5546 Installation of gas hot water supplies for
domestic purposes (2nd Family Gases)
BS 6700 Design, installation testing and maintenance of
services supplying hot water for domestic use.
BS. 6798 Installation of gas fired hot water boilers of
rated input not exceeding 70 kW.
BS. 6891 Low pressure installation pipes.
Health & Safety Document No. 635.