Installation; Notes On Installation And Operation - Bosch ZBR16-3A Installation And Service Instructions Manual

5

Installation

DANGER: Explosion!
B Close the gas cock prior to working on the
gas train.
B Check for gas leaks after carrying out work
on the gas train.
Installation, power connection, connection on
the gas and flue gas side and commissioning
must only be carried out by a contractor
certified for such work by the state or local
jurisdiction or the local gas or power utility.
5.1

Notes on installation and operation

When installing and operating the heating system observe
the following:
• The elevation of the installation location above sea level
must be taken into account (
• Follow all local building regulations regarding the
installation conditions on site.
• The local building regulations regarding air supply and
venting systems and the chimney flue connection.
• Electrical code requirements for connection to the
electrical power supply.
• The technical regulations of the gas company regarding
the connection of the gas burner to the local gas main.
• The regulations and standards relating to the DHW
heating system.
Copyright (optional information)
Chapter 11.2).
5.1.1 Notes on installation and operation
Fill and make-up water for the heating system
Unsuitable fill and make-up water can result in the heating
system scaling up or failing prematurely.
Water hardness in grains
per gallon (Ca(HCO )
3 2
concentration in ppm)
soft: ≤ 9 grains
(≤ 150 ppm)
medium: 9 - 14.6 grains
(150 - 250 ppm)
hard: ≥ 14.6 (≥ 250 ppm)
Tab. 12 Water preparation for filling and maintaining the
heating system (water hardness)
pH-value
7-8.5
< 7 or > 8.5
Tab. 13 Water preparation for filling and maintaining the
heating system (pH-value)
Recirculation pump/DHW recirculation lines
Total length DHW/
recirculation line
≤ 33 ft (10 m)
33 - 66 ft (10 - 20 m)
66 - 98 ft (20 - 30 m)
Tab. 14 Recommended flow rates
Use service function 6.d, to determine the
current flow rate (
Electrical connection of the DHW recirculation pump
( page 55).
Connect the DHW recirculation line with the cold water
inlet as close as possible to the Hydraulics connection
plate.
Open vented heating systems
B Convert open vented heating systems into closed
systems.
Installation | 35
Water preparation
Not needed
Recommended
Required
Water preparation
Not needed
Required
Flow rate
0.66 gpm (2.5 l/min)
0.92 gpm (3.5 l/min)
1.32 gpm (5 l/min)
page 71).
6 720 643 068 (2011/06)