Fitters’ Notes |
Condensing units |
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Contents |
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General information on operating Danfoss condensing units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . .3. . . |
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Equipment configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . .3. . . . . . . |
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Power supply and electrical equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . .3. . . . . . |
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Hermetic compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 4 |
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Condensers and fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . .4. . . . . . . |
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Stop valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 4 |
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Receiver Pressure container ordinance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . .5. . . . . . |
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Terminal box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 5. . . . . . |
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Safety pressure monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . .5. . . |
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Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 5. . . . . . . |
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Protective weather-proof housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 6 |
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Careful installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 6. . . . . . |
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Contamination and foreign particles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 6. . |
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Doing the pipe work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 6. . |
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Tubing layout of the condensing units with 1-cylinder compressors |
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types TL, FR, NL, SC and SC-TWIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 6. . . . . . . |
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Tubing layout of the condensing units with hermetic Maneurop® |
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reciprocating piston compressors, 1-2-4 cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 8 |
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Leak check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . .8. . . . |
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Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . .9. . . . . |
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Protective gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . .9. . . . . . |
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Evacuating and filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. .10. . . . . . . . |
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Exceeding the max.. allowable operational filling capacity and setting up outdoors . . . . . . . . . . . |
. . 11. . . . |
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General information: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. .11. . . . . . . |
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“Pump-down” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 13. . . . . . . . |
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Max.. allowable temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 14. . . . . . . |
<![if ! IE]> <![endif]>Condensing units |
DKRCC.PF.000.G3.02 / 520H6471 |
1 |
Notes
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Fitters’ Notes |
Condensing units |
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General information |
In the following you will find general information |
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on operating Danfoss |
and practical tips for using Danfoss condensing |
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condensing units |
units . Danfoss condensing units represent |
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an integrated range of units with Danfoss |
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reciprocating piston compressors. The versions |
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and configurations of this series correspond |
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to the requirements of the market. To give |
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an overview of the program, the individual |
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subsections are generally divided into the |
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various hermetic compressors mounted on the |
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condensing units. |
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Condensing units with 1-cylinder compressors |
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(types TL, FR, NL, GS, SC and SC-TWIN). |
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Condensing units with hermetic 1 -2 and 4 |
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cylinder Maneurop® reciprocating piston |
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compressors MTZ, NTZ and MPZ. |
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Equipment configuration |
Danfoss condensing units are delivered with a |
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compressor and condenser mounted on rails |
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or a base plate. Terminal boxes are prewired. In |
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addition, stop valves, solder adaptors, collectors, |
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dual pressure switches and power cables with |
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3-pin grounded plugs complete the delivery kit. |
Please consult the corresponding Danfoss documentation or the current price list for details and ordering numbers. The Danfoss sales company responsible for your area will be glad to help you make your selection.
Power supply and electrical equipment
Condensing units with 1-cylinder compressors (types TL, FR, NL, GS, SC and SC-TWIN)
These condensing units are equipped with hermetic compressors and fans for 230 V 1-, 50 Hz power supply.
The compressors are equipped with an HST starting device consisting of a starting relay and a starting capacitor. The components can also be delivered as spare parts.
The starting capacitor is designed for short activation cycles (1.7% ED). In practice, this means that the compressors can perform up to 10 starts per hour with an activation duration of 6 seconds.
Condensing units with hermetic 1-2 and 4 cylinder Maneurop® reciprocating piston compressors MTZ and NTZ.
These condensing units are equipped with hermetic compressors and fan(s) for different voltage supplies:
• 400 V-3ph-50 Hz for compressor and for fan(s) .
•400 V-3ph-50Hz for compressor and
230 V-1ph-50Hz for fan(s) (the capacitor(s) of the fans are included inside the electrical box) .
•230 V-3ph-50Hz for compressor and
230 V-1ph-50Hz for fan(s) (the capacitor(s) of the fans are included inside the electrical box) .
•230 V-1ph-50Hz for compressor (the starting device (capcitors, relay) is included into the electrical box) and 230V-1ph-50Hz for fan(s)
The starting current of the Maneurop® threephase compressor can be reduced through the use of a soft starter. CI-tronicTM soft start, type MCI-C is recommended for use with this type of compressor. The starting current can be reduced up to 40% depending on the compressor model and the model of soft start used. The mechanical load that occurs at start-up is also reduced, which increases the lifespan of the internal components.
For details on the CI-tronicTM MCI-C soft start, please contact your local Danfoss dealer. The number of compressor starts is limited to 12 per hour in normal conditions. Pressure equalisation is recommended when MCI-C is used.
<![if ! IE]> <![endif]>Condensing units |
DKRCC.PF.000.G3.02 / 520H6471 |
3 |
Fitters’ Notes |
Condensing units |
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Hermetic compressors |
The hermetically sealed compressor types w, |
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FR, NL, GS, SC and SC TWIN have a built-in |
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winding protector.. When the protector is |
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activated, a switch-off time of up to 45 minutes can |
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occur as the result of heat storage in the motor.. |
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The single-phase Maneurop® compressors |
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MTZ and NTZ are internally protected by a |
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temperature/current sensing bimetallic protector, |
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which senses the main and start winding currents |
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and also the winding temperature.. |
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The three-phase Maneurop® reciprocating piston |
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compressors MTZ and NTZ are equipped against |
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over-current and over-temperature by internal |
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motor protection.. The motor protection is located |
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in the star point of the windings and opens all |
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3 phases simultaneously via a bimetallic disk.. |
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After the compressor has switched off via the bi- |
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metallic disc, reactivation can take up to 3 hours.. |
If the motor does not work, you can determine by means of resistance measurement whether the cause is a switched off winding protection switch or a possible broken winding..
Condensers and fans |
Highly effective condensers allow a broader |
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range of usage at higher ambient temperatures.. |
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One or two fan motors are used per condensing |
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unit depending on the output value.. |
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In addition, the fans can be equipped, e..g.. with |
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a Danfoss Saginomiya fan speed regulator, type |
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RGE.. This allows good condensing pressure |
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control and reduces the noise level.. The fans |
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are provided with self-lubricating bearings, |
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which ensures many years of maintenance-free |
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operation.. |
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Stop valves |
Danfoss condensing units are provided with stop |
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valves on the suction and liquid side.. |
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The stop valves of the condensing units with |
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the 1-cylinder compressors (types TL, FR, NL, |
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GS, SC and SC TWIN) are closed by turning the |
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spindle clockwise to te soldered piece.. This opens |
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the flow between the pressure gauge connection |
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and the flare connection.. If you turn the spindle |
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counter-clockwise to the rear stop, the pressure |
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gauge connection is closed.. The flow between |
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the soldered and the flare connection is free.. In |
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the centre position, the flow through the three |
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connections is free.. The accompanying soldered |
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adapters help prevent flare connections and to |
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make the system hermetic.. |
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The stop valves of the condensing units with |
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Maneurop® reciprocating piston compressors |
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MTZ and NTZ are directly fitted into the suction |
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and discharge rotalock ports of the compressor |
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and on the receiver.. The suction valve is provided |
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with long, straight tube pieces in such a manner |
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that soldered connections can be carried out |
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without disassembling the Rotalock valve.. |
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4 |
DKRCC.PF.000.G3.02 / 520H6471 |
Fitters’ Notes |
Condensing units |
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Receiver |
Liquid receiver is standard on Danfoss |
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condensing units for use with expansion valves.. |
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The expansion valve is regulating the level in |
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the receiver buffer (the deor increasing flow |
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of the refrigerant).. The receivers from an internal |
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volume of 3 l onwards are equipped with a |
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Rotolock Valve.. |
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Terminal box |
The Danfoss condensing units are electrically |
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pre-wired and equipped with a terminal box.. |
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Thus the power supply and additional electrical |
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wiring can be easily fitted.. The terminal box of |
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the condensing units with Maneurop® |
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compressors is equipped with screw type |
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connector blocks for both power and controls.. |
The electrical connections of each component (compressor, fan(s), PTC, pressure switch) are centralised into this box.. A wiring diagram is available in the cover of the electrical box.. These terminal boxes are protected to a degree of IP 54..
Safety pressure monitors |
Danfoss condensing units can be ordered |
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with safety pressure switches KP 17 (W, B…).. |
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Condensing units that do not come equipped |
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with pressure switches from the factory must |
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be equipped with a pressure switch at least |
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the high-pressure side in systems with |
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thermostatic expansion valves as per EN 378.. |
LP A B
Start
Di .
Stop
HP A B
Stop
Di .
Start
The following settings are recommended:
Refrigerant |
Low pressure side |
High pressure side |
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Cut in (bar) |
Cut off (bar) |
Cut in (bar) |
Cut off (bar) |
R407C |
2 |
1 |
21 |
25 |
R404A/R507 MBP |
1..2 |
0..5 |
24 |
28 |
R404A/R507 LBP |
1 |
0..1 |
24 |
28 |
R134a |
1..2 |
0..4 |
14 |
18 |
Setup |
Danfoss condensing units must be set up in a |
The ventilator motor is connected in such a way |
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well ventilated location.. |
that the air is drawn in via the condenser in the |
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You must ensure that there is sufficient fresh air |
direction of the compressor.. |
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for the condenser at the intake end.. |
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In addition, you must ensure that no cross-flow |
the condenser must be cleaned regularly.. |
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occurs between the fresh air and the exhaust air.. |
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<![if ! IE]> <![endif]>Condensing units |
DKRCC.PF.000.G3.02 / 520H6471 |
5 |
Fitters’ Notes |
Condensing units |
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Protective weather-proof |
Danfoss condensing units that are set up |
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housing |
outside must be provided with a protective |
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roof or with protective weather-resistant |
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housing.. The scope of delivery includes |
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optional, high-quality protective weather- |
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proof housings.. |
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Careful installation
Contamination and foreign particles
Doing the pipe work
Tubing layout of the condensing units with 1-cylinder compressors (types GS, TL, FR, NL, SC and SC-TWIN)
More and more commercial cooling and |
hermetic compressors.. High demands are put |
air-conditioning systems are installed with |
on the quality of the installation work and the |
condensing units that are equipped with |
alignment of such a cooling system.. |
Contamination and foreign particles are among the most frequent causes that negatively impact the reliability and lifespan of cooling systems..
During the installation, the following types of contamination can enter the system:
Scaling during soldering (oxidations)Flux residue from soldering
Humidity and outside gasses
Shavings and copper residues from deburring the tubing
For this reason, Danfoss recommends the following precautions:
Use only clean and dry copper tubing and components that satisfy standard DIN 8964..
Danfoss offers a comprehensive and integral range of products for the necessary cooling automation.. Please contact your Danfoss dealer for additional information..
When laying the tubing, you should try to make the shortest and most compact pipe work possible.. Low-lying areas (oil traps), where oil might accumulate should be avoided..
1.. Condensing unit and evaporator are |
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located on the same level. |
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The suction line should be arranged slightly |
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downward from the compressor.. The max.. |
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permissible distance between the condensing |
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unit and the cooling position (evaporator) is |
Evaporator |
Condenser |
30 m.. |
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Compressor |
Suction Line |
Liquid Line |
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Diameter copper pipe [mm] |
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TL |
8 |
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6 |
FR |
10 |
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6 |
NL |
10 |
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6 |
SC |
10 |
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8 |
GS |
12/16 |
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10 |
SC-TWIN |
16 |
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10 |
6 |
DKRCC.PF.000.G3.02 / 520H6471 |
Fitters’ Notes |
Condensing units |
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Tubing layout of the condensing units with 1-cylinder compressors (types TL, FR, NL,SC, GS and SC-TWIN) (continued)
To ensure the oil return, the following crosssections are recommended for the intake and liquid lines:
2..The condensing unit is arranged above the evaporator.
The ideal height difference between the condensing unit and the evaporator position is a max.. of 5 m.. The tube length between the condensing unit and the evaporator should not exceed 30 m.. The suction lines must be laid out with double arcs in the form of oil traps above and below.. This is done using a U-shaped arc at the lower end and a P-shaped arc at the upper end of the vertical riser.. The max.. distance between the arcs is 1 to 1..5 m.. To ensure the oil return, the following pipe diameters are recommended for the suction and liquid lines:
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Suction Line |
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Liquid Line |
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Diameter copper pipe [mm] |
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TL |
8 |
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6 |
FR |
10 |
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6 |
NL |
10 |
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6 |
SC 12/15 |
10 |
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8 |
All other SCs |
12 |
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8 |
GS |
16 |
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10 |
SC TWIN |
16 |
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10 |
3..The condensing unit is arranged under the evaporator.
The ideal height difference between the condensing unit and the evaporator is a max.. of 5 m.. The tube length between the condensing unit and the evaporator should not exceed 30 m.. The suction lines must be laid out with double arcs in the form of oil traps above and below.. This is done using a U-shaped arc at the lower end and a P-shaped arc at the upper end of the vertical riser.. The max.. distance between the arcs is 1 to 1..5 m.. To ensure the oil return, the following pipe diameters are recommended for the suction and liquid lines:
Evaporator
Condenser
Compressor
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Suction Line |
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Liquid Line |
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Diameter copper pipe [mm] |
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TL |
8 |
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6 |
FR |
10 |
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6 |
NL |
10 |
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6 |
SC |
12 |
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8 |
GS |
16 |
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10 |
SC TWIN |
16 |
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10 |
<![if ! IE]> <![endif]>Condensing units |
DKRCC.PF.000.G3.02 / 520H6471 |
7 |