Bosch DHW Tank QWST120 O Bedienungsanleitung

Installation and Maintenance Instructions

DHW Tank

QWST120 O

6 720 648 100-00.1ITL

6 720 648 071 (2012/03) US

Table of Contents

6 720 648 071 (2012/03)

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

Key to symbols and safety instructions

6 720 648 071 (2012/03) 3

1 Key to symbols and safety instructions

1.1 Explanation of symbols

Warnings

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

Additional symbols

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.

BRead the safety instructions carefully prior to

commissioning the system.

BEnsure that only a trained and certified contractor

carries out installation, commissioning, maintenance

and service.

BEnsure that the system is approved by the local

jurisdiction.

BClean 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

BNever 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.

BEnsure that only individuals who can operate this

appliance correctly have access to it.

BInstallation and commissioning as well as servicing

and maintenance must be carried out only by a

trained and certified contractor.

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.

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.

Symbol Function

BSequence of steps

ÆCross-reference to other points in this

document or to other documents

•Listing/list entry

–Listing/list entry (2nd level)

Table 1

Key to symbols and safety instructions

6 720 648 071 (2012/03)

Installation and operation

BHave the appliance installed only by a qualified

contractor.

BEnsure that the hot water tank is completely full prior

to start up.

BTo prevent damage from excess pressure, never

disable the safety valves.

BWater 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.

BInstall the unit only in a frost-free room.

BNever store or place combustible material or liquids

near the appliance.

BMaintain safe clearances in accordance with local/

national regulations.

Risk of fatal injury from electric shock

BIf an aquastat is used with line voltage, it must be

connected by a licensed electrician. The terminal

wiring diagram must be followed.

BBefore 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.

BDo not install this device in rooms with a high

moisture level (e.g. bathrooms, saunas).

Inspection/maintenance

BRecommendation: sign a maintenance and inspection

contract with a qualified heating contractor and have

the appliance serviced annually.

BThe owner/operator is responsible for the safety and

environmental compatibility of the system.

BRead 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.

BUse only original spare parts and accessories from

the manufacturer.

Frost damage

BWhen 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.

Instructing the owner/operator

BInstruct the owner/operator in the functionality and

operation of the appliance.

BInform the owner/operator that they must never carry

out any modifications or repairs.

BInform the owner/operator that children

unsupervised by adults should never be in the vicinity

of the heating system.

BComplete the commissioning report in this document

and hand it over to the owner/operator.

BGive the technical documentation to the owner/

operator.

Disposal

BDispose of packaging in an environmentally

responsible manner.

BDispose of the appliance correctly at an authorized

disposal site.

Cleaning

BClean the outside of the appliance with a damp cloth.

General points

6 720 648 071 (2012/03) 5

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 (ÆFig. 1).

Fig. 1 Minimum space requirements for installation

and maintenance

6 720 648 100-14.1ITL

16"

min. 4"

(406 mm)

(102 mm)

Moving the tank

6 720 648 071 (2012/03)

3 Moving the tank

The DHW tank can be moved by means of a hand truck

(accessory, ÆFig. 2) while still packaged or after

removal of the packaging.

BPosition the tank on the hand truck, secure with a

strap if necessary, and transport safely to the

installation location.

BRemove the strap.

Fig. 2 Hand truck (illustrative)

BRemove the plastic wrapping.

BRemove the polystyrene cover pad and 4 wooden

boards.

BLay the polystyrene cover [1] on the ground and

carefully lay the DHW tank [2] on its side.

BRemove bottom polystyrene pad and pallet. Install the

adjustable feet M10 x 30 [3].

Fig. 3 DHW tank on polystyrene cover pad (illustrative)

1Polystyrene cover pad

2DHW Tank

3Adjustable feet

BPlace the DHW tank upright.

BDispose of the DHW tank packaging in an

environmentally responsible manner.

NOTICE: Take care not to damage the tank

when moving it.

BObserve the handling instructions on the

packaging.

BUse suitable means of transportation,

e.g. a hand truck with strap, to handle

this product.

BMove this product upright.

BPrevent impact and shock.

6 720 648 100-02.1ITL

6 720 648 100-15.1ITL

ca. 0.78"

2 3

3/4 - 1"

(19 - 25 mm)

Dimensions and connections

6 720 648 071 (2012/03) 7

4 Dimensions and connections

Fig. 4 Dimensions and connections

1Magnesium anode

AB Hot water outlet

EK Cold water inlet

VS Tank coil supply

RS Tank coil return

MB Hot water temperature sensor or Aquastat

EL Drain

6 720 648 100-13.1ITL

EKRSVS

20"

37"

3/4" - 1"

20"

(508 mm)

37"

(940 mm)

3/4" - 1"

(19 - 25 mm)

Type VS RS EK/AB Sacrificial

anode

Weight (empty)

Lbs (kg)

120 NPT ¾ " NPT ¾ " NPT ¾ " G 1" 158 (72)

Table 2 Dimensions and connections

Installation

6 720 648 071 (2012/03)

5 Installation

BLevel the DHW tank by adjusting the feet (ÆFig. 5).

Fig. 5 Adjusting the feet (illustrative)

5.1 Safety limits

Maximum Temperature:

•Heating water (boiler) 230 °F (110 °C)

•Domestic water (DHW tank) 203 °F (95 °C)

Operating pressure:

•Heating water (boiler) 87 psi 1

•Domestic water (DHW tank) 145 psi (10 bar)

5.2 Connections and fittings

It is the installer's responsibility to follow national and

local code when installing this tank (ÆFig. 6).

BConnect all piping to the DHW tank by means of

threaded fittings. For easy service and maintenance,

each connection should be equipped with a shutoff

valve. Install a drain valve [2] in the hot water pipe

upstream and downstream of the shut-off valve [3].

Attach a tag with the following statement to the safety

valve [4]: "Do not close drain line. During heating,

water may be released for safety reasons."

Fig. 6 Installation (illustrative)

1Storage tank

2Purge valve

3Shut-off valve with drain

4Pressure and temperature safety valve

5Flow check valve

6Shut-off valve

7DHW recirculation pump (optional)

8Pressure reducer (if required)

9Purge valve

10 Backflow preventer

11 Pressure gauge connection

12 Drain

AB Hot water outlet

EK Cold water inlet

EZ Recirculation inlet

EL Drain

WARNING: Risk of damage to property and

personal injury if temperature / pressure

limits exceeded.

BFor safety reasons, never exceed the

following limits.

1. From the heating system, individual safety equipment

required (safety valve, expansion vessel).

6 720 648 100-05.1ITL

6 720 648 100-06.1ITL

11 10 9 8 6

6 7 6

Installation

6 720 648 071 (2012/03) 9

BA listed pressure and temperature relief valve (PTRV)

must be installed at the time of installation. No valve

is to be placed between the PTRV and the heater. No

reducing coupling or other restriction may be

installed in the discharge line. The discharge line must

be a minimum of 6" (153 mm) above a drain and

installed such that it allows complete drainage of

both the PTRV and the line. The discharge line must

be placed where it will not cause any water damage.

The location of the PTRV must be readily accessible

for servicing or replacement, and be mounted as close

to the water heater as possible.

BManually activate the TPRV annually to ensure proper

operation. If the TPRV does not activate it must be

replaced.

BMake sure that the installed pipework and

connections are free of stress.

BCheck all connections for leaks! Do not kink or twist

hoses.

Safety valve

Only use approved and listed pressure and temperature

relief valves of the proper size for the output of the tank.

5.3 Temperature monitoring control

options

Install a temperature sensor or an Aquastat on the DHW

tank to measure and monitor the hot water temperature.

5.3.1 Installing the temperature sensor

BFeed the temperature sensor [2] with the spring [1]

into the sensor well [3].

Fig. 7 Installing the temperature sensor

1Spring clip

2Temperature sensor

3Sensor well

WARNING: Precautions must be taken prior

to manually operating the relief valve to

avoid contact with hot water being released

and to prevent water damage.

WARNING: If a relief valve discharges

periodically, this may be due to thermal

expansion in a closed water supply system.

Contact the installer to correct this

situation. Do not plug the relief valve.

Minimum

connection

diameter

Nominal capacity

of the water

chamber (gal)

Max. heating

capacity

[kBtu/hr]

3/4" 32 (120 liters) 255

Table 3 Safety valve

Ensure that the sensor surface has contact

with the sensor well surface over its full

length, and that it cannot accidentally be

pulled out.

6 720 648 100-07.1ITL

Installation

6 720 648 071 (2012/03)

5.3.2 Installing the Aquastat

BRemove cover from the Aquastat.

BIf necessary, remove any unnecessary attachments.

Attach bracket [3] to Aquastat [2] by means of 2 self-

tapping screws [1].

Fig. 8 Attaching the Aquastat to the bracket

1Self-tapping screws C-ST 4.2x13 mm

2Aquastat

3Bracket

BFeed the temperature probe [4] with the spring [5]

into the sensor well [3]. Ensure that the probe makes

contact with the well wall over its entire length.

BAttach Aquastat [2] to the DHW tank by means of

2 self-tapping screws [1].

Fig. 9 Installing the Aquastat

1Self-tapping screws C-ST 4.2x13 mm

2Aquastat

3Sensor well

4Temperature sensor

5Spring

BReplace the cover of the Aquastat.

DANGER: Risk of fatal injury from electric

shock.

BDisconnect all electrical power before

working on the system.

6 720 648 100-08.1ITL

Connect the electrical power and set the

temperature as shown in the manual

supplied with the Aquastat.

6 720 648 100-09.1ITL

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