Danfoss Optyma OP-UPAC015COP04E User Manual Download

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3.2 Device to be connected to low pressure side

3.3 Location & fixings

3. Application Range

Select and connect devices (show case, etc.) to be connected to the low pressure side of condensing unit according to the following

table.

Install the equipment in a plane surface where air circulates around the equipment and the equipment operates correctly.

So not install in the following locations:

• A dusty place

• Place with flammable gas atmosphere

• Place where water or oil (contain machine oil) is scattered or where there is a lot of steamPlace exposed to direct sunlight for a long time.

• Area with high corrosive atmosphere

• Install the unit in areas with a lot of snow, wind, and lightning so that it does not interfere with the operation of the unit. If snow accu-

mulates on its feet, it will cause problems with outside air temperature measurement.

• Areas with large voltage fluctuations

• Place where there is a machine that generates electromagnetic waves

• Place where not blocking or expose an obstacle for walking areas, doors, windows etc.

Item

Specifications

Number of connectable units

1 unit - 8 units

Load capacity

Determine the capacity of indoor units (show cases, etc,) connecting to the low pressure side of refrigeration unit,
such that the total rated nominal capacities of these units, is over 50% and below 100% of the refrigeration unit’s
capacity

Minimum load during
operation

Where two or more indoor units are connected and low pressure side devices are turned off by the thermostat OFF,
arrange it such that they will operate at over 50% of refrigeration unit’s rated capacity.

Module controller

Use specific module controllers and expansion valves recommended by Danfoss

Expansion valve

Select an appropriate diameter for electronic expansion valve.
Recommended (Example) ... When 3 units of low pressure side devices are connected: AKV 10P4

Heat exchanger specifications

Select specifications with which the refrigerant flow speed in the heat exchanger piping is within the oil returnable
range in the following figure.

Range of gas flow speed at the evaporator outlet during rated operation.

Install the earth leakage breaker on the electric circuit to provide more safe protective function. It will prevent electric shock in the event of earth
leakage.

Cleaning solution of gas cooler, or antifreeze solution, should not be disposed in a sewer, but disposed according to provisions of applicable

laws. For details, consult your dealer or the customer service desk of maker.

Be sure to secure installation spaces.
It could cause failures on the compressor or electric equipment owing to short-circuit in air flow

EEV

G (kg/s)

EVAPORATOR

v(m/s)

(kg/m

)

G=Q/Δh

v=G/(ρ

G: Amount of refrigerant circulang (kg/s)

Q: capacity (kW)

Δh: enthalpy (kJ/kg)

v: flow speed per pass (m/s)

: refrigerant density (kg/

)

n: number of circuit

A: cross-seconal area of the pipe (m

)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

-45 -40 -35 -30 -25 -20 -15 -10 -5

Flow speed in pipe/

heat exchanger path v (m/s)

Evaporation temperature T (ºC)

Oil returnable range

Danf

80G8354

Fig. 7

(*) A service space of 800mm minimum is
necessary if installed in series. More than 800
mm is nice to have to inspect or replace parts of
the condensing unit.

Take care not to interfere with the service space
during piping work. Where the necessary space
is not available, install a stand to run the piping
under the unit.
(*1) Be sure to keep more than 100mm spaces
when the unit contacts with a wall. If the unit
installed in succession, 10mm spaces is enough.

(*2) A space of 330mm is necessary when the
power cable is taken in from L2 side, where
units are installed in series.

Fig. 8

28 X 14

1350
1000

500

764

1691.5

261.6

264.4

740

≥ L1

≥ L2