CIAT LP Series - Hydraulic Connections

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HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 12.122 H

Water chillers and

air-water heat pumps

CIATCooler LP

Minimum installation volume

The electronic control for these units incorporates an auto-adaptive

control for the compressor operating time based on the time set for

anti-short-cycle.

This control reduces the number of times the compressor is started

up and permanently adjusts the system's thermal inertia, favouring

the reduction of the minimum volume of water in the installation. The

size of the buffer tank can also be decreased since the unit will be

stopped for less time.

Where:

inst

Installation volume (l)

inst

Expansion vessel volume (l)

Initial volume of 1kg of water (at water temperature with the machine stopped)

Final volume of 1kg of water (at water temp. with the machine at normal speed)

Final network pressure (safety valve pressure in bars + 1)

Initial network pressure (absolute ﬁ lling pressure of the installation in bars)

Note: If the hydraulic circuit has a buffer tank, its volume must be taken

into account for this calculation.

• Volume occupied by 1kg of water at different temperatures:

Maximum installation volume

The water capacity for the installation obtained from this equation

corresponds to the maximum that

the installation allows based on the

expansion vessel assembled.

 Installation water volume

Temperature (ºC) Volume (l) Temperature (ºC) Volume (l)

0 1,00013 50 1,0121

4 1,00000 60 1,0171

10 1,00027 70 1,0227

20 1,00177 80 1,0290

30 1,00435 90 1,0359

40 1,00782 100 1,0434

ifvessel

INST

PVV

PPV

⋅−

−

⋅

)(

The calculation of the minimum water volume has been done for nominal

EUROVENT conditions, only in cooling mode. This value is applicable

for the majority of refrigeration applications (group with fan-coil units).

Note: The buffer tank is indispensable in installations that operate with a

reduced volume of water (group with an air handling unit) or for industrial

processes. For applications with a heat pump, it is recommended that

the buffer tank be used in order to maintain a stable temperature during

the defrosting cycles.

 The water capacity for the installation indicated in this table corresponds

to the maximum that the installation allows based on the expansion vessel

assembled on the unit. The volume of the buffer tank has been taken into

account for this section. In case the capacity of the installation is greater,

it is necessary to add a supplementary expansion vessel to the installation

based on its volume.

 This temperature corresponds to the temperature that the circuit may reach

when the unit is stopped. This case must be considered for cooling-only units.

 This temperature corresponds to the maximum temperature that the circuit

may reach when operating in a heat pump.

Maximum volume of water in an installation with a hydraulic module:

Hydraulic connections

CIATCooler

Minimum volume (I) Minimum ﬂ ow (l) Maximum ﬂ ow (l)

90V-STD

101 2,2 6,2

100V-STD

120 2,7 7,4

120V-STD

143 3,1 8,8

160V-STD

187 4,1 11,3

180V-STD

204 4,3 12,7

200V-STD

123 4,7 15,0

240V-STD

138 6,2 17,2

280V-STD

156 7,2 19,2

320V-STD

189 8,3 23,6

360V-STD

207 8,6 26,0

420V-STD

248 12,2 31,4

480V-STD

271 13,4 34,5

600V-STD

333 16,9 42,1

640V-STD

185 18,2 48,2

720V-STD

210 20,9 54,3

840V-STD

244 24,1 63,5

960V-STD

265 26,6 69,4

CIATCooler

Minimum volume (I) Minimum ﬂ ow (l) Maximum ﬂ ow (l)

90V-HEE

107 2,8 6,7

100V-HEE

132 2,9 8,1

120V-HEE

152 3,8 9,5

160V-HEE

189 3,7 11,7

180V-HEE

210 4,0 12,8

200V-HEE

129 5,7 16,2

240V-HEE

152 6,5 19,3

280V-HEE

172 7,6 21,4

320V-HEE

187 9,1 23,6

360V-HEE

214 10,7 26,8

420V-HEE

251 12,2 31,7

480V-HEE

278 13,5 34,9

600V-HEE

344 17,4 42,8

640V-HEE

183 18,1 47,5

720V-HEE

211 21,2 54,3

LPC + module