11
ecoTEC plus 937 installation and maintenance manual
The ecoTEC plus 937 is a fully-automatic wall-mounted
unit with condensing technology for central heating and
hot water preparation and with a shift load storage tank
for the storage of hot water.
Mains cold water heated by the combi boiler is fed to the
heat insulated storage tank by means of a modulating
storage tank charging pump.
The provision of hot water takes place directly from the
combi boiler without the need for a copper cylinder, a
cold water tank or a supply and expansion vessel with
the corresponding pipework. The provision of hot water
has priority over the central heating.
The combi unit supplies the shift load storage tank with
electrical energy for the storage tank charging pump.
The combi unit is equipped with a warm start function
which keeps the heat exchanger hot so that hot water is
immediately available.
The temperature in the hot water heat exchanger is
limited by the control system.
Fitting a water softener on the mains cold water inlet of
the combi boiler is not necessary. In regions with
extremely hard water (greater than 300 mg/l of CaCO
3
)
however a water softener may still be fitted in order to
prevent the formation of scale build up in the water
pipes.
The heating system can be filled using the filling devices
fitted to the ecoTEC plus combination boilers.
The ecoTEC plus 937 is be supplied for natural gas and
can be converted for propane gas with a conversion kit.
3 General
requirements
3.1
Preliminary remarks for room sealed
appliances
This appliance should only be installed in conjunction
with either a Vaillant flue system or an alternative
approved system (details of flue approval categories can
be found in the technical section of the installation
manual).
Install the flue system as detailed in the separate flue
installation instructions supplied with this boiler.
3.2 Related
documents
The installation of the boiler must be in accordance with
the relevant requirements of Gas Safety (Installation and
Use) Regulations 1998, Health and Safety Document No.
635 (The Electricity at Work Regulations 1989), BS 7671
(IEE Wiring Regulations) and the Water Supply (Water
Fitting) Regulations 1999, or The Water Bylaws 2000
(Scotland). It should also be in accordance with the
relevant requirements of the Local Authority, Building
Regulations, The Building Regulations (Scotland), The
Building Regulations (Northern Ireland) and the relevant
recommendations of the following British Standards:
BS 6700: Services supplying water for domestic use
within buildings and their curtilages.
BS 6798: Specification for installation of gas fired
boilers not exceeding 60 kW input.
BS 6891: Specification for installation of low pressure
gas pipework up to 28 mm (R1) in domestic premises
(2nd family gas).
BS 7593: Treatment of water in domestic hot water
central heating systems. – Institute of Gas Engineers
Publication IGE/UP/7/1998: ”Guide for gas installations
in timber framed housing”
BS 5482: Pt. 1 Domestic butane and propane gas burning
installations.
IGE/UP1: Soundness testing and purging of industrial and
commercial gas installation.
IGE/UP2: Gas installation pipework, boosters and
compressors on industrial and commercial premises.
IGE/UP10. Installation of gas appliances in industrial and
commercial premises.
BS 6644: Installation of gas fired hot water boilers of
rated inputs between 60 kW and 2 MW (2nd and 3rd
family gases).
BS 5449: Forced circulation hot water central heating
systems for domestic premises. Note: only up to 45 kW.
BS 6880: Low temperature hot water heating systems of
output greater than 45 kW.
Part 1 Fundamental and design considerations.
Part 2 Selection of equipment.
Part 3 Installation, commissioning and maintenance.
BS 4814: Specification for: Expansion vessels using an
internal diaphragm, for sealed hot water heating
systems.
BS 5440: Installation and maintenance of flues and
ventilation for gas appliances of rated input not
exceeding 70 kW net (1st, 2nd and 3rd family gases).
Part 1 Specification for installation of flues.
Part 2 Specification for installation and
maintenance of ventilation for gas appliances.
European installation directive
a
Caution!
Installation and maintenance of the unit may
only be undertaken by a competent person in
accordance with the "Gas Safety (Installation
and Use) Regulations 1998".
In IE the installation must comply with the
current Version of I.S.813 ‘Domestic Gas
Installations’ and the current Building
Regulations. The current ETCI Regulations for
the installation of electrical equipment must
also be observed.
Caution!
To tighten or loosen bolts, only use suitable
open-ended spanners (do not use wrenches or
extensions etc.).
Improper use or unsuitable tools can cause
damage, (such as gas or water leaks.)
Unit description, data and dimensions 2
General requirements 3
