Bosch Zwb283 Manual

Operating Instructions
Residential Gas Condensing Boiler
Greenstar
6 720 806 992-00-1O
ZBR16/21/28/35/42-3A... | ZWB28/35/42-3A...
6 720 806 993 (2013/03) CA/US 

2 | Contents
6 720 806 993 (2013/03) Greenstar
Contents
1 Key to symbols and safety instructions   . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
1.1 Key to symbols   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
1.2 Safety instructions   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
2 Information about the appliance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
2.1 Certifications . ....

Contents | 3
6 720 806 993 (2013/03)Greenstar
6 Energy saving tips  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   24
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   26
8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   27
9 Environmental responsibility/disposal   . . . . . . . . . . . . . . . . . . . . . . . . . . .   28
10 Quick...

4 | Key to symbols and safety instructions
6 720 806 993 (2013/03) Greenstar
1 Key to symbols and safety instructions
1.1 Key to symbols
Warnings
Keywords at the start of a warning indicate the type and seriousness of the ensuing 
risk if measures to prevent the risk are not taken. The following keywords are defined 
and can be used in this document:
•NOTICE indicates that property damage may occur.
•CAUTION indicates that personal injury may occur.
•WARNING indicates that severe personal injury may...

Key to symbols and safety instructions | 5
6 720 806 993 (2013/03)Greenstar
1.2 Safety instructions
General information
This manual is available in English and French.
▶ Keep this manual for future use.
▶ Observe the safety instructions of this manual before putting the heating 
appliance into operation.
If the information in this manual is not followed exactly, a fire or explosion may result 
causing property damage, personal injury or loss of life.
▶ Do not store or use gasoline or other flammable...

6 | Key to symbols and safety instructions
6 720 806 993 (2013/03) Greenstar
For appliances operating on room air: Danger of flue gas poisoning if supply of 
combustion air is insufficient
▶ Safeguard supply of combustion air.
▶ Do not cover or reduce the size of ventilation openings in doors, windows and 
walls.
▶ Safeguard sufficient supply of combustion air also for appliances installed at a 
later date, e.g. kitchen exhaust fans, clothes dryers, and air conditioning units 
with vent to the outside.
▶...

Information about the appliance | 7
6 720 806 993 (2013/03)Greenstar
Sign a maintenance and inspection contract with a trained and certified contractor, 
covering an annual inspection and demand-dependent maintenance. This 
guarantees high efficiency and environmentally sound combustion.
Explosive and easily combustible materials
Never use or store easily combustible materials (paper, thinners, paints, etc.) near 
the appliance.
Combustion air / room air
To prevent corrosion, keep the supply of...

8 | Preparing the appliance for operation
6 720 806 993 (2013/03) Greenstar
The commercial and industrial use of the appliance for generating process heat is not 
permitted.
2.3 Overview of boiler types
Z Central heating appliance
W DHW heating
B Condensing technology
R Constant temperature control
16…42  Output up to 54,600 / 71,600 / 95,500 / 119,400 / 143,300 BTU/hr
(16 / 21 / 28 / 35 / 42 kW)
-3 Version
A Fan-supported appliance 
3 Preparing the appliance for operation
▶ If existing, open the heating...

Preparing the appliance for operation | 9
6 720 806 993 (2013/03)Greenstar
3.1 Checking the boiler water pressure
The standard boiler water pressure is 14.5 - 21.75 psi (1 - 1.5 bar).
Should a higher boiler water pressure be required, refer to a trained and certified 
heating contractor.
Fig. 1  
3.2 Topping up the heating system water
Topping up the heating system water is different on every system. Therefore, you 
should ask a trained and certified heating contractor to show you how it is done.
Maximum...

10 | Operation
6 720 806 993 (2013/03) Greenstar
4 Operation
These operating instructions apply only to the boiler. 
Depending on the heating control unit used, some functions may vary.
The following options for controlling the heating system are available:
• Outdoor reset control unit ( page 16, Fig. 6) installed in the boiler ( page 12, 
[19])
• Outdoor reset control unit mounted on the wall
• Room thermostat
• Outdoor reset with room influence (room thermostat)
• Third party system control unit...