Bosch Bosch 17e Installation Guide download pdf (Page 8)

C:\Documents and Settings\Matt\My Documents\Business\everlast\content\commerical_315C250_MANUALandWarranty.doc Page 8 of 12 January, 2006 Revision 3

The Bosch Continuous Flow Water Heater Manuals available from

Robert Bosch Australia; and the publication "Selection and Sizing of

Copper tubes for water piping Systems" by B. Smith, available from

Copper & Brass Information Centre, or Institute of Plumbing Australia;

are helpful publications.

Whilst major systems do require the input of competent hot water

system designers, the application of the Guidelines in the above

publications and particularly the Guidelines for Installation in the

Bosch Continuous Flow Water Heater Manuals will facilitate good

design in respect to Pipework.

COMBO System Pump, Flow & Pressure characteristics.

Primary Circulation Circuit. Typical for the 160MJ units.

No of

160 MJ

units

Assumed

Flow Rate

Litres per

min

Pressure

Loss

kPa

Typical Pump

Model &

Speed Setting

Basis of the Pressure &

Flows in Primary Pipe

Sizing and approximate

lengths.

1 10-20 30-40 DaveySB30-25

Speeds 1 & 2

25 mm pre-fitted Integrated

Package.

2 20 34 Gfs UPS32-80B

Speed 2

3 30 38 Gfs UPS32-80B

Speed 2

4 40 42 Gfs UPS32-80B

Speed 2

5 50 46 Gfs UPS32-80B

Speed 2

32 mm tube up to a length

of 20 metres & 20 mm tube

at Gas Units up to 3 metres,

yields very small pressure

drops. Greater lengths may

be calculated.

These Davey & Grundfos pumps are multi speed pumps where pump speed

may be matched to system design (see above). They have a bronze body

and brass connections. Refer to the Davey & Grundfos Pump Manuals for

single speed and Secondary Piping Circulator pump alternatives.

Internal Installation Water Safety

For internal (indoor) installations of Accumulator, a safe tray is

recommended in accordance with Australian Standard AS 3500.4

This is necessary to prevent damage associated with a leaking pump

or fittings, or when flushing the Accumulator.

Secondary Circulating Pump and Pipework

The secondary circulating pump and pipework (where required) will

always be sized to produce the flow rate that has been determined

from system heat losses and draw off's that provides acceptable

temperature drop before return.

The Davey SB30-25 multi speed pump may be utilised for secondary

circulation, or when secondary pipework is 25 mm or 18 mm, the

SB25-20 or Grundfos equivalent may be preferable such as the UPS

25-40B, UPS 25-60B & UP 25-80B. Flow characteristics to suit the

system may be selected from the manufacturers Circulator Pumps

Handbooks. These handbooks incorporate flow curves for each pump

which may be relied upon to suit the hot water circulation

requirements of the system.

Electrical Connection & Wiring

The Bosch-Everlast™COMBO Commercial Gas Hot Water System is

designed for single phase 240 V. A.C. supply only. Australian

Standard AS 3000 – (Wiring Code), and local supply authority

regulations apply.

Notes for the following Schematic Wiring Plans :

240 V AC Supply is required at the point of connection of the

Accumulator Thermostat for the operation of the Primary Circulating

Pump. Where a Secondary Circulating Pump is required, the AC

supply to this pump must be located in close proximity to the pump.

Connection is made at the terminal location points under the IP rated

weatherproof thermostat cover. Wiring entry to the connection point is

made through the blanked-off standard conduit port adjacent to the

thermostat cover, by removal of the blanking plug. Always install a

standard 20 mm conduit elbow to the port to ensure conduit support.

240 V AC Supply may be required at the point of connection of the

Gas Continuous Flow Water Heater(s) to energise the electronic

burner ignition system.

High Temperature Hot Water Applications are referred to the further

schematic for the high temperature thermostat, and the notes therein.

1 2 3 4 5 6 7 8 9 10 11 12

Comments to this Manuals

No comments

Bosch Bosch 17e Installation Guide Page 8

Comments to this Manuals

Related products and manuals for Water heaters & boilers Bosch Bosch 17e