G As Supply Natural Gas; G As Supply Propane - andrews CWH30/100 Installation Manual, Operation And Maintenance Manual

SECTION 3
G AS SUPPLY
NATURAL GAS
G AS SUPPLY
PROPANE
12
INSTALLATION
The installation of the gas supply must conform, depending on it's size, to the
requirements of British Standards and Codes of Practice listed in Section 1 of this manual.
A gas meter will be connected to the service pipe by British Gas plc or it's authorised
contractor.
The meter and service pipe should be checked by British Gas or it's authorised contractor
to ensure that they are adequate to deal with the gas supply to the water heater(s) in
addition to any existing or additional requirements.
Fit the service gas cock (supplied) to the gas connection on top of the water heater using
a suitable jointing compound and connect to the gas supply.
Where the water heater(s) is(are) installed in a water heater house or purpose built
compartment, a manually operated valve for the water heater house must be fitted in
accordance with the Gas Safety (Installation and Use) Regulations 1998. The valve must
be easily identified and readily accessible.
After installation, the system should be pressure tested for soundness and purged in
accordance with BS 6891 or IM/ 2 and IM/ 5 as appropriate.
Please note that the minimum dynamic gas pressure for Natural Gas must not fall
below 18 mbar.
Contact your provider or supplier who will provide the appropriate type and size of LPG
supply vessel and ensure it's safe location and installation.
The installation of the gas supply must conform to LPGA Code of Practice, 22 LPG Piping
Systems: Design and installation plus the requirements of British Standards and Codes of
Practice listed in Section of this manual.
Andrews water heaters are unregulated and a second stage regulator must be installed to
give an inlet pressure to the appliance as follows: (See fig. 2).
PROPANE: 37 mbar (14.86 in wg)
When using propane cylinders, connect a minimum number of 47kg cylinders as listed
below, together with a manifold before connecting to the union.
Use a minimum pipe size of
Two 47kg Cylinders
Three 47kg Cylinders
Four 47kg Cylinders
WAR N IN G !
P R O P AN E CY LIN D E R S M U S T B E U S E D AN D S T O R E D IN ACCO R D AN CE WIT H 'T HE
HIG HLY F LAM M AB LE LIQ U ID S AN D LIQ U IF IE D P E T R O LE U M G AS E S R E G U LAT IO N S
1 9 7 2 ', AN D S HO U LD CO M P LY WIT H LP G A CO D E O F P R ACT ICE 7 , 'S T O R AG E O F
F U LL AN D E M P T Y LP G CY LIN D E R S AN D CAR T R ID G E S '.
Also please note that for Propane the minimum dynamic gas pressure to the unit must
not fall below 37 mbar.
3
⁄ in bore.
4
LCWH30 and LCWH60
LCWH9 0
LCWH1 2 0