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Any refrigerant transfer and recovery operations must be carried out using a transfer unit for HFO application. A
connection under the evaporator is supplied with all units for connection to the transfer station. The units must
never be modified to add refrigerant and oil charging, removal and purging devices. These devices are provided
with the units. Please see to the certified dimensional drawings for the units.

INTRODUCTION AND CHILLER FAMILIARISATION

Prior  to  initial  start-up  of  the  19DV  unit,  those  involved  in  the  start-up,  operation,  and  maintenance  should  be
thoroughly  familiar  with  these  instructions  and  other  necessary  job  data.  This  document  is  outlined  so  that  you
may  become  familiar  with  the  control  system  before  performing  start-up  procedures.  Procedures  in  this  manual
are arranged in the sequence required for proper chiller start-up and operation.

Since 19DV is equipped with VFD (Variable Frequency Drive), special qualifications are required for personnel
commissioning these machines or working on the variable-frequency drive.

2.1 Operating conditions range

Transport and storage of 19DV units

The minimum and maximum allowable outside temperatures are:
Minimum temperature = -15°C
Maximum temperature = +60°C.

Operating limits

In operating the minimum and maximum allowable outside temperatures are:
Minimum temperature = +5°C
Maximum temperature = +40°C.
The operating and storage conditions are as those described for the standard machine. The machines must be
installed inside the building. Electrical cabinets are protected IP23 in accordance with standard IEC60529-1.

The operating range of the selected unit must always be verified at full load and part load by the selection program
for the chosen configuration.
The selection program values apply. If they are outside the operating limits below, the selection must be validated
by the factory customer support team.

Indicative operating range of 19DV chiller

Evaporator (fresh water)

Minimum

Maximum

Evaporator entering water temperature

°C

28**

Evaporator leaving water temperature

°C

Condenser (water-cooled)

Condenser entering water temperature

°C

13*

Condenser leaving water temperature

°C

*: this minimum can be maintained with head pressure control system such as 2 or 3 way valve or any other applicable
devices…
** : In operation or before starting, the user must maintain a water inlet temperature at the evaporator of 28 ° C maximum to
avoid, in the event of extreme failure of the control system and the pressure switches, any risk of overpressure causing reli ef
valve exhaust.
When chiller is stopped, the maximum permissible circulation temperature in the exchangers is 65 ° C. Higher temperatures can
result in a risk of valve tripping.

2.2 Abbreviations and explanations

Frequently used abbreviations in this manual include:

CCN

—

Carrier Comfort Network

CCW

—

Counter Clock Wise

—

Clock Wise

CHWR

—