38
CONNECTIONS
– GAS
GAS INLET
All gas work must be carried out by a qualified person and in accordance with the Australian Gas
Installations Standard AS/NZS 5601.1, AS 3814 and local authority requirements.
DANGER:
Make sure the gas on which the heater will operate is the same type as specified on the
heater’s rating plate.
The pipe work must be cleared of foreign matter before connection and purged at the union to the gas
control or pressure regulator before attempting to light the water heater. If this procedure is not
performed, a flame failure lockout may result on initial start-up.
Gas piping
MUST
have a sediment trap ahead of the heater gas controls, refer to Fig 13 on page 38.
An isolation valve and disconnection union must be installed to allow servicing and removal of the water
heater. Refer to AS/NZS 5601.1 for the correct pipe sizing.
GAS CONNECTIONS
MVB Model
910500
910750
911000
911250
911500
911750
912000
Gas Connection*
R1
R1
R1¼
R1¼
R1¼
R2
R2
*Water and gas connections on the MVB are NPT threaded and will not seal against ISO 7 (BSP)
threads. The NPT/BSP adaptors supplied MUST be fitted in order to make further connections to the
system.
Table 13: Gas Connection Sizes
Fig. 13: Gas Supply Connection
Warning:
Before pressure testing the gas supply system always isolate and disconnect the water
heater after the isolating cock to prevent the risk of serious damage to the gas control or pressure
regulator. Relieve test pressure in the gas supply line prior to re-connecting the heater and its manual
shut-off valve to the gas supply line.
FAILURE
TO FOLLOW THIS PROCEDURE MAY DAMAGE
THE
GAS VALVE
. Warranty does not cover damage of any nature resulting from failure to observe this
precaution. Refer to the water heaters rating label for gas types and pressures.
