Water Connections; Correction Factors - CLIMAVENETA ACCURATE AXO Installation Manual

WATER CONNECTIONS

For all the water connections (with the exception of the
condensate drain), the following are recommended:
- flexible connections to avoid transmitting vibrations and
allow small movements of the air-conditioner;
- joints in three pieces, near the fittings, to simplify the
removal of the unit;
- on-off valves to disconnect the unit from the water cir-
cuit: where possible use ball valves with full opening to
minimise pressure drop.
(For AW* models) check that the cross-section of the
chilled water pipes and the characteristics of the circulat-
ing pump are suitable: an insufficient water flow-rate affects
the performance of the air-conditioner.
Check that the water inlet and outlet connections are cor-
CONNECTION TO BRAZED PLATE CONDENSER
AW* water-cooled units
The condenser must be connected to the cooling water circuit,
making sure that the water inlet and outlet connections are cor-
rect.
If the water temperature falls below the dew point of the condi-
tioned air, insulate the pipes with closed cell material (e.g.:
Armaflex or equivalent) to prevent condensation; the insulation
must allow access to the valves and the three-piece joints.
Seal the holes where the pipes pass through the base of the air-
IW Condenser water inlet
UW Condenser water outlet

CORRECTION FACTORS

ETHYLENE GLYCOLE
A mix of water plus glycole used has fluid instead of only water
cause a cooling capacity reduction of the unit. Multiplay the coo-
Iceing temperature
% of glycole on tot. charge
Power factor
Flow factor
P. drops factor
INCROSTATION FACTOR
All datas reported are refered to a complete clean brazed blade
condenser (incrostation factor = 1).
Incrostation factor
Incrostation factor
Compressor factor
Total power factor
ACCURATE AX* - AW*
07 - 10
3/4"
3/4"
0 -5
0 12%
cP 1 0,985
cQ 1 1,02
cdp 1 1,07
(m2 °C/W)
f1
fk1
fx1
rect.
Insulate all the chilled water pipes with closed cell material
(e.g.: Armaflex or equivalent), to prevent condensation; the
insulation must allow access to the valves and the three-
piece joints.
(For AW* models) check that the water circuits (both
chilled and heated water) are supplied with water at a
maximum pressure of 6 bar: for this purpose, the installer
must fit a safety valve in the water circuit set no higher
than 6 bar.
(For AW* models) check that the water circuit has been
filled with an antifreeze mixture containing the right per-
centage of ethylene glycol.
conditioner to avoid the bypass of air.
N.B.: the pressure of the cooling water circuit must not exceed 6
bar.
15 - 18
20 - 26
29 - 39
1.1/4"
1.1/4"
ling capacity for the values reported of the following tables
-10 -15
20% 28%
0,98 0,974
1,04 1,075
1,11 1,18
For different values of incrostation factor multiplay all datas
reported on cooling capacity tables for factors reported on fol-
lowing table.
4,4 x10-5 0,86x10-4
--- 0,96
--- 0,99
---
U I A
U I A
30- 40
50 -55 - 60 - 70
2 x 1.1/4"
2 x 1.1/4"
U I A
-20 -25
35% 40%
0,97 0,965
1,11 1,14
1,22 1,24
1,72x10-4
0,93
0,98
0,99 0,98
English 01/07
21