9
Installation/Operating Instructions
Invented for life
GAS CONNECTION
(1) Fit a union to the water heater gas inlet for easy connection and removal. The
thread diameter is
20
mm.
THIS DOES NOT INDICATE THE SIZE OF THE GAS SUPPLY.
(2) Fit an AGA / NZGA approved isolating gas cock in the supply line adjacent to
the water heater gas connection.
(3) Ensure that the supply pipe and the gas pressure regulator (LPG or Natural
Gas) has sufficient flow capacity for this and other appliances connected to the
fitting line.
(4) For LPG appliances ensure that gas cylinders are of sufficient size. The water
heater alone will require 2 x 45 Kg capacity cylinders.
(5) Before connecting the appliance to the gas service, purge any debris or air from
the gas service.
(6) Check all joints for leaks with an approved leak tester after connection.
Ensure that the gas pipe size is correct. If undersized the appliance will not
operate correctly
SERVICE CALLS ARE CHARGEABLE FOR UNITS WITH INCORRECT PIPE
SIZES OR BLOCKED GAS OR WATER FILTERS.
COLD WATER CONNECTION TO WATER HEATER
Refer to technical sheet for position of connections. The WATER INLET connection is
20
mm 3/4" BSP and requires a union to allow for removal of the water heater. Pipe
sizing from the cold water supply should be sized according to local BY LAWS for water
supply.
If sludge or foreign matter is present in the water supply it is recommended that a
separate filter/strainer be fitted to the cold water supply line.
A solar transfer valve must be fitted with all solar applications using the
Bosch Highflow range. Solar systems fitted without a solar transfer valve will
void all Bosch Warranty
ISOLATING GATE VALVE
A GATE VALVE OR BALL VALVE must be used on the cold water inlet to the water
heater. THIS REQUIREMENT IS AN AUSTRALIA WIDE REQUIREMENT UNDER
THE NATIONAL PLUMBING CODE.
STOP TAPS OR COMBINATION STOP TAPS AND NON-RETURN VALVES ARE
NOT TO BE USED.
N.B.
NO PRESSURE REDUCTION VALVE IS REQUIRED UNLESS THE WATER
PRESSURE EXCEEDS
10
00
k
P
a
Refer to AS 5601 Installation Code or NZ installation code for pipe sizing details.
For your assistance we have included the following pipe sizing from AS 5601.
FOR COPPER TUBE USING NATURAL GAS
13 mm
18
mm
20 mm
25 mm
NOMINAL PIPE
SIZE IN MM
4
4
4
4
LENGTH OF STRAIGHT
IN METRES
43
82.2
142
313
HOURLY RATE.
RATE IN Mj/H
