Viessmann NC-Box Instrucciones de funcionamiento

Installation and service instructions

for contractors

VIESMANN

NC-Box

Pre-assembled unit for implementing the natural cooling function in conjunction

with brine/water heat pumps up to 17 kW

For applicability, see the last page

NC-Box

5675 869 GB 2/2015 Please keep safe.

Please follow these safety instructions closely to

prevent accidents and material losses.

Safety instructions explained

Danger

This symbol warns against the risk of injury.

!Please note

This symbol warns against the risk of material

losses and environmental pollution.

Note

Details identified by the word "Note" contain additional

information.

Target group

These instructions are exclusively intended for author-

ised contractors.

■Work on the refrigerant circuit may only be carried

out by authorised refrigeration engineers.

■Work on electrical equipment must only be carried

out by a qualified electrician.

■The system must be commissioned by the system

installer or a qualified person authorised by the

installer.

Regulations to be observed

■National installation regulations

■Statutory regulations for the prevention of accidents

■Statutory regulations for the protection of the envi-

ronment

■Codes of Practice of the relevant trade associations

■All relevant safety regulations as defined by DIN, EN,

DVGW, VDE and locally applicable standards

aÖNORM, EN and ÖVE

cSEV, SUVA, SVTI, SWKI and SVGW

Working on the system

■Isolate the system from the power supply (e.g. by

removing the separate fuse or by means of a mains

isolator) and check that it is no longer 'live'.

Note

In addition to the control circuit there may be several

load circuits.

Danger

Contact with 'live' components can result in

severe injuries. Some components on PCBs

remain 'live' even after the power supply has

been switched off.

Wait at least 4 minutes before removing equip-

ment covers, to allow the voltage to dissipate.

■Safeguard the system against reconnection.

!Please note

Electronic assemblies can be damaged by elec-

trostatic discharge.

Prior to commencing work, touch earthed

objects such as heating or water pipes to dis-

charge static loads.

Repair work

!Please note

Repairing components that fulfil a safety func-

tion can compromise the safe operation of your

system.

Replace faulty components with genuine

Viessmann spare parts.

Auxiliary components, spare and wearing parts

!Please note

Spare and wearing parts that have not been tes-

ted together with the system can compromise its

function. Installing non-authorised components

and making non-approved modifications or con-

versions can compromise safety and may inva-

lidate our warranty.

For replacement, use only spare parts supplied

or approved by Viessmann.

Safety instructions

5675 869 GB

1. Information Symbols ................................................................................................. 4

Product information ................................................................................ 4

2. Preparing for installation Hydraulic connection with on-site pipework ........................................... 5

Hydraulic connection with hydraulic connection set .............................. 5

Siting and transport requirements .......................................................... 6

■Transport ............................................................................................ 6

■Installation room requirements ........................................................... 6

3. Installation sequence Fitting the NC-Box ................................................................................. 7

Opening the NC-Box .............................................................................. 8

Hydraulic connection ............................................................................. 8

■Preparation for retrofitting ................................................................... 8

■Required connections ......................................................................... 9

■Connection with hydraulic connection set .......................................... 10

■Installing the contact humidistat 24 V– ............................................... 10

Electrical connection .............................................................................. 12

■Required connections ......................................................................... 12

Power supply ......................................................................................... 14

Closing the NC-Box ............................................................................... 15

4. Commissioning and

adjustment

.................................................................................................................. 16

5. Parts lists Overview of assemblies ......................................................................... 18

■Parts not shown .................................................................................. 19

Hydraulics .............................................................................................. 20

Electrical equipment .............................................................................. 22

Connection set ....................................................................................... 24

6. Connection and wiring dia-

gram

.................................................................................................................. 26

7. Specification .................................................................................................................. 27

8. Declaration of conformity .................................................................................................................. 28

9. Keyword index .................................................................................................................. 29

Index

5675 869 GB

Symbol Meaning

Reference to other document containing

further information

Step in a diagram:

The numbers correspond to the order in

which the steps are carried out.

Warning of material losses and environ-

mental pollution

Live electrical area

Pay particular attention.

■Component must audibly click into place.

■Acoustic signal

■Fit new component.

■In conjunction with a tool: Clean the sur-

face.

Dispose of component correctly.

Dispose of component at a suitable collec-

tion point. Do not dispose of component in

domestic waste.

Product information

Design and function

The NC-Box includes all hydraulic and electrical com-

ponents required for cooling a heating/cooling circuit or

a separate cooling circuit in conjunction with a brine/

water heat pump.

The temperature level of the primary circuit is directly

transferred to the cooling circuit for central cooling.

Hydraulic connections

The heating/cooling circuit or the separate cooling cir-

cuit and the primary circuit (brine) are hydraulically

connected directly to the NC-Box. The hydraulic con-

nection between the heat pump and the NC-Box can

be made on site or via the hydraulic connection set

(accessories).

Electrical connection

The NC-Box and the heat pump are connected electri-

cally. The cable for switching the NC-Box (NC signal)

is connected inside the NC-Box and routed outside at

the factory.

Product validity

The NC-Box can be used in conjunction with the fol-

lowing heat pumps:

■Vitocal 200-G

■Vitocal 222-G

■Vitocal 242-G

■Vitocal 300-G, types BW/BWC 301.A06 to A17

■Vitocal 300-G, types BW/BWC 301.B06 to B17

■Vitocal 333-G, types BWT 331.B06 to B10

■Vitocal 343-G

■Vitocal 350-G, type BW/BWC 351.A07

Information

Symbols

5675 869 GB

Information

For

■Vitocal 222-G/242-G and Vitocal 333-G/343-G

■Vitocal 200-G, Vitocal 300-G and Vitocal 350-G with-

out sufficient installation space above the heat

pump, e.g. when retrofitting

1. Fit the NC-Box near the heat pump on a wall capa-

ble of bearing the load.

2. Connect on-site connection lines so that they are

free of load and torque stress.

Hydraulic connection with hydraulic connection set

Vitocal 200-G, Vitocal 300-G and Vitocal 350-G with

sufficient installation space above the heat pump: See

page 7.

223

Fig.1

ANC-Box

BReturn, heating/cooling circuit or separate cooling

circuit

CFlow, heating/cooling circuit or separate cooling

circuit

DPrimary circuit flow (NC-Box brine entry)

ESecondary circuit return to heat pump

FSecondary circuit flow to the NC-Box

GHeat pump

HPrimary circuit flow (heat pump brine inlet)

KPrimary circuit BDF valve (brine)

LSecondary circuit BDF valve (heating water)

Preparing for installation

Hydraulic connection with on-site pipework

5675 869 GB

Installation

Transport

!Please note

Impacts, compression and tensile loads can

cause damage to the outside panels of the

appliance.

Never apply loads/weight to the top, front or

side panels of the appliance.

Installation room requirements

!Please note

Unfavourable ambient conditions can lead to

malfunctions and appliance damage.

■The installation room must be dry and free

from the risk of frost.

■Ensure ambient temperatures between 0 and

35 °C.

Danger

Dust, gases and vapours can be damaging to

health and trigger explosions.

Avoid dust, gases and vapours in the installation

room.

Preparing for installation

Siting and transport requirements

5675 869 GB

Installation

■Installation without hydraulic connection set:

Fit the NC-Box near the heat pump on a wall capable

of bearing the load.

■Installation with hydraulic connection set:

Fit the NC-Box above the heat pump with the clear-

ances shown in Fig. 2.

160

760

223

Fig.2

Installation sequence

Fitting the NC-Box

5675 869 GB

Installation

Fig.3

Note

Should there be insufficient space for working, front

casing part B can also be removed. First, remove

casing cover D and pull out the panel with cable

entries E.

ATerminal box

BFront casing part

CPower cable, heat pump connecting cables (NC

signal) and contact humidistat (connected at the

factory)

DCasing cover

EPanel with cable entries and strain relief fittings

Hydraulic connection

To prevent corrosion damage, provide all hydraulic

pipes with thermal insulation as vapour diffusion-proof

installation (on the brine and cold water sides) in

accordance with current engineering standards.

Preparation for retrofitting

1. Close ball valves and sliders. 2. Open the primary circuit (brine) and the secondary

circuit (heating water) at a suitable position and

drain the heat transfer medium.

Installation sequence

Opening the NC-Box

5675 869 GB

Installation

Required connections

Subject to the type of cooling circuit, the NC-Box can

be connected to the heat pump in two different ways.

Heating/cooling circuit, e.g. underfloor heating

Required hydraulic connection between the NC-Box

and heat pump:

■Primary circuit flow

■Secondary circuit flow and return

Separate cooling circuit, e.g. fan convector

Required hydraulic connection between the NC-Box

and heat pump:

■Primary circuit flow

For this, note the following:

■Seal the secondary circuit connector on the NC-Box.

■Connect the secondary circuit flow and return directly

on the heat pump.

■Equip a separate cooling circuit with a dedicated

expansion vessel and a safety valve (2.5 bar/

0.25 MPa).

Installation sequence

Hydraulic connection (cont.)

5675 869 GB

Installation

Connection with hydraulic connection set

Fig.4

Tightening torques for fitting the union nuts

Line Connection to

Heat

pump

NC-Box

Primary circuit flow A (heat

pump brine inlet)

70 Nm 70 Nm

Secondary circuit flow B70 Nm 50 Nm

Secondary circuit return C70 Nm 50 Nm

Installing the contact humidistat 24 V–

The contact humidistat monitors the formation of con-

densate on the flow of the heating/cooling circuit or of

the separate cooling circuit.

■Where the heating/cooling circuit extends over sev-

eral rooms with different relative humidity levels, it

may become necessary to provide several contact

humidistats.

■Where several contact humidistats are used, connect

all contact humidistats electrically in series.

■In the delivered condition, the contact humidistat

switches at a relative humidity of 80 %. This value

can be adjusted.

Contact humidistat installation instructions

Note

In the delivered condition, the contact humidistat is

located outside the NC-Box casing and is electrically

connected at the control panel. The associated con-

necting cable is routed through the cable entry in the

NC-Box.

Installation conditions: The flow and return of the heat-

ing/cooling circuit or the separate cooling circuit are

connected to the NC-Box.

Installation sequence

Hydraulic connection (cont.)

5675 869 GB

Installation

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