Bosch QWST120 O Installation And Maintenance Instructions Manual
Installation and Maintenance Instructions
DHW Tank
QWST120 O
6 720 648 100-00.1ITL
6 720 648 071 (2012/03) US
Table of Contents
Table of Contents
1 Key to symbols and safety instructions . . . . . . . 3
1.1 Explanation of symbols . . . . . . . . . . . . . . . 3
1.2 Safety instructions . . . . . . . . . . . . . . . . . . 3
2 General points . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Delivered condition . . . . . . . . . . . . . . . . . . 5
2.2 Tank installation . . . . . . . . . . . . . . . . . . . . 5
3 Moving the tank . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Dimensions and connections . . . . . . . . . . . . . . . 7
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 Safety limits . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Connections and fittings . . . . . . . . . . . . . . 8
5.3 Temperature monitoring control options. . 9
5.3.1 Installing the temperature sensor . . . . . . . 9
5.3.2 Installing the Aquastat . . . . . . . . . . . . . . 10
6 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 Maintenance and cleaning . . . . . . . . . . . . . . . . 12
7.1 Checking the magnesium anode . . . . . . . 12
7.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.3 Recommissioning after cleaning . . . . . . . 13
8 Spare parts for QWST120 O . . . . . . . . . . . . . . . 14
2
6 720 648 071 (2012/03)
1 Key to symbols and safety instructions
Key to symbols and safety instructions
1.1 Explanation of symbols
Warnings
Warnings are indicated in the text by a
warning triangle and a gray background.
In case of danger from electric shock, the
exclamation point on the warning triangle is
replaced with a lightning symbol.
Signal words at the beginning of a warning are used to
indicate the type and seriousness of the ensuing risk if
measures for minimizing damage are not taken.
• NOTICE indicates that minor damage to property may
occur.
• CAUTION indicates possible minor to medium
personal injury.
• WARNING indicates possible severe personal injury.
• DANGER indicates that fatal injury may occur.
Important information
Important information that presents no risk
to people or property is indicated with this
symbol. It is separated by horizontal lines
above and below the text.
Additional symbols
Symbol Function
B Sequence of steps
1.2 Safety instructions
Safety instructions
Failure to observe the safety instructions can result in
serious injury and a risk of fatal injury as well as damage
to property and the environment.
B Read the safety instructions carefully prior to
commissioning the system.
B Ensure that only a trained and certified contractor
carries out installation, commissioning, maintenance
and service.
B Ensure that the system is approved by the local
jurisdiction.
B Clean and perform maintenance at least once a year.
Check that the entire system functions properly at the
same time. Immediately remedy faults.
Danger from failing to consider your own safety in an
emergency such as a fire
B Never put yourself at risk of fatal injury. Your own
safety must always take the highest priority.
Risk of damage from operator error
Operator errors can lead to injuries and/or damage to
property.
B Ensure that only individuals who can operate this
appliance correctly have access to it.
B Installation and commissioning as well as servicing
and maintenance must be carried out only by a
trained and certified contractor.
Æ Cross-reference to other points in this
document or to other documents
• Listing/list entry
– Listing/list entry (2nd level)
Table 1
6 720 648 071 (2012/03)
3
Key to symbols and safety instructions
Installation and operation
B Have the appliance installed only by a qualified
contractor.
B Ensure that the hot water tank is completely full prior
to start up.
B To prevent damage from excess pressure, never
disable the safety valves.
B Water may escape from the safety valve when water is
being heated. Ensure that the safety valve is piped to
within 6 inches of the ground in an area where
property damage will not occur.
B Install the unit only in a frost-free room.
B Never store or place combustible material or liquids
near the appliance.
B Maintain safe clearances in accordance with local/
national regulations.
Risk of fatal injury from electric shock
B If an aquastat is used with line voltage, it must be
connected by a licensed electrician. The terminal
wiring diagram must be followed.
B Before carrying out any work, isolate all phases of the
electrical power using the emergency shut-off switch
or by disengaging the heating system circuit breaker.
Secure against unintentional reconnection.
B Do not install this device in rooms with a high
moisture level (e.g. bathrooms, saunas).
Instructing the owner/operator
B Instruct the owner/operator in the functionality and
operation of the appliance.
B Inform the owner/operator that they must never carry
out any modifications or repairs.
B Inform the owner/operator that children
unsupervised by adul ts should never be in the vicinit y
of the heating system.
B Complete the commissioning report in this document
and hand it over to the owner/operator.
B Give the technical documentation to the owner/
operator.
Disposal
B Dispose of packaging in an environmentally
responsible manner.
B Dispose of the appliance correctly at an authorized
disposal site.
Cleaning
B Clean the outside of the appliance with a damp cloth.
Inspection/maintenance
B Recommendation: sign a maintenance and inspection
contract with a qualified heating contractor and have
the appliance serviced annually.
B The owner/operator is responsible for the safety and
environmental compatibility of the system.
B Read and follow the safety instructions in the
"Cleaning and maintenance" chapter.
Original spare parts
Damage caused by spare parts not supplied by the
manufacturer are excluded from our warranty.
B Use only original spare parts and accessories from
the manufacturer.
Frost damage
B When there is a risk of frost, drain the water from the
DHW tank and the heating system's pipework. The
system is protected from frost only if it is completely
dry.
4
6 720 648 071 (2012/03)
2 General points
2.1 Delivered condition
The DHW tank QWST120 O Is delivered as a fully
assembled unit.
Additional components supplied with the tank:
1 125 psi P and T valve
3 3/4" brass couplings
1 3/4" brass tee
1 Honeywell L4006 adjustable differential tank
aquastat
1 Aquastat mounting bracket and 4 mounting screws
3 Adjustable tank leg leveling bolts
1 Roll of high quality Teflon tape
2.2 Tank installation
Select a dry, frost free room for installation. The tank
must not be allowed to freeze, or it must be drained or
protected appropriately when not in operation. The floor
must be level and able to carry the weight of the unit.
When installing the heating boiler and DHW tank,
observe the minimum clearance requirements for
assembly and service (Æ Fig. 1).
General points
(406 mm)
16"
(406 mm)
16"
min. 4"
Fig. 1 Minimum space requirements for installation
and maintenance
(102 mm)
6 720 648 100-14.1ITL
6 720 648 071 (2012/03)
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