Danfoss BW10 020-090 Installation, Operation And Maintenance Instructions Download Page 4

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1 - INTRODUCTION

Prior to the initial start-up of the BW10 unit, the people

involved in the on-site installation, start-up, operation and

maintenance of this unit should be thoroughly familiar with

these instructions and the specific project data for the

installation site.

The BW10 liquid units are designed to provide a very high level

of safety during installation, start-up, operation and

maintenance. They will provide safe and reliable service when

operated within their application range.

This manual provides the necessary information to fami-liarize

yourself with the control system before performing start-up

procedures. The procedures in this manual are arranged in the

sequence required for machine installation, start-up, operation

and maintenance.

Be sure you understand and follow the procedures and safety

precautions contained in the instructions supplied with the

machine, as well as those listed in this guide.

To find out, if these products comply with European directives

(machine safety, low voltage, electromagnetic compatibility,

equipment under pressure etc.) check the declarations of

conformity for these products.

1.1 - Installation safety considerations

After the unit has been received, when it is ready to be installed

or reinstalled, and before it is started up, it must be inspected for

damage. Check that the refrigerant circuit(s) is (are) intact,

especially that no components or pipes have shifted (e.g.

following a shock). If in doubt, carry out a leak tightness check

and verify with the manufacturer that the circuit integrity has

not been impaired. If damage is detected upon receipt,

immediately file a claim with the shipping company.

Do not remove the skid or the packaging until the unit is in

its final position. These units can be moved with a fork lift

truck, as long as the forks are positioned in the right place

and direction on the unit.

The units can also be lifted with slings, using only the

designated lifting points marked on the unit.

These units are not designed to be lifted from above. Use

slings with the correct capacity, and always follow the lifting

instructions on the certified drawings supplied with the unit.

Safety is only guaranteed, if these instructions are carefully

followed. If this is not the case, there is a risk of material

deterioration and injuries to personnel.

DO NOT COVER ANY PROTECTION DEVICES.

This applies to fuse plugs and safety valves (if used) in the

refrigerant or heat transfer medium circuits. Check if the

original protection plugs are still present at the valve outlets.

These plugs are generally made of plastic and should not be

used. If they are still present, please remove them. Install

devices at the valve outlets or drain piping that prevent the

penetration of foreign bodies (dust, building debris, etc.) and

atmospheric agents (water can form rust or ice). These

devices, as well as the drain piping, must not impair operation

and not lead to a pressure drop that is higher than 10% of the

control pressure.

Classification and control

In accordance with the Pressure Equipment Directive and

national usage monitoring regulations in the European

Union the protection devices for these machines are classified

as follows:

Safety
accessory*

Damage limitation accessory**
in case of an external fire

Refrigerant side

High-pressure switch

External relief valve***

Rupture disk

Fuse plug

Heat transfer fluid side

External relief valve****

Classified for protection in normal service situations.

** Classified for protection in abnormal service situations.
*** The instantaneous over-pressure limited to 10% of the operating pressure does

not apply to this abnormal service situation. The control pressure can be higher
than the service pressure. In this case either the design temperature or the high-
pressure switch ensures that the service pressure is not exceeded in normal service
situations.

**** The classification of these safety valves must be made by the personnel that

completes the whole hydronic installation.

Do not remove these valves and fuses, even if the fire risk is

under control for a particular installation. There is no

guarantee that the accessories are re-installed if the instal-

lation is changed or for transport with a gas charge.

All factory-installed safety valves are lead-sealed to prevent

any calibration change. If the safety valves are installed on a

reversing valve (change-over), this is equipped with a safety

valve on each of the two outlets. Only one of the two safety

valves is in operation, the other one is isolated. Never leave the

reversing valve in the intermediate position, i.e. with both ways