Carrier 30PA 180, Installation, Operation And Maintenance Instructions

Page: 11 / 28

11
8 - CHECKING BEFORE COMMISSIONING
Where:
V
inst
Installation volume (l)
V
inst
Expansion vessel volume (l)
V
1
Initial volume of 1kg of water (at water temperature with the machine stopped)
V
2
Final volume of 1kg of water (at water temp. with the machine at normal speed)
P
f
Final network pressure (safety valve pressure in bars + 1)
P
i
Initial network pressure (absolute
fi
lling pressure of the installation in bars)
Note: If the hydraulic circuit has a bu
ff
er tank, its volume must be
taken into account for this calculation.
Volume occupied by 1kg of water at di
ff
erent 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.
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
f
i f vessel
INST
P V V
P P V
V
⋅ −
−
⋅
) (
) (
1 2
=
The calculation of the minimum water volume has been done for
nominal conditions of water inlet/outlet temperature 12°C/7°C and
outdoor air temperature 35ºC, only in COOLING mode. This value
is applicable for the majority of refrigeration applications (group
with fan-coil units).
Note : The bu
ff
er tank is indispensable in installations that operate
with a reduced volume of water (group with an air handling unit)
or for industrial processes.
30PA
Minimum
volume (I)
Minimum
fl
ow (m
3
/h)
Maximum
fl
ow (m
3
/h)
90STD
101 2,2 6,2
100STD 120 2,7 7,4
120STD 143 3,1 8,8
160STD 187 4,1 11,3
180STD 204 4,3 12,7
90HEE 107 2,1 6,7
100HEE 132 2,9 8,1
120HEE 152 3,3 9,5
160HEE 189 3,7 11,7
180HEE 210 4,0 12,8
Anti-freeze protection with glycol water
If a pure product is used for dilution in order to protect the hydraulic
circuit, the following instructions must be followed:
■
Do not introduce any of the pure anti-freezing product separately
and then the water in the installation.
■
Always prepare the water m anti- corrosion
inhibitor at the correct dosage prior to introducing it into the
installation.
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 bu
ff
er tank can also be decreased since the unit
will be stopped for less time.
Installation water volume
Hydraulic connections
Evaporator operating limits
The curves represent the minimum and maximum admissible
temperature increases based on the outlet (discharge)
temperature, for both pure water and glycol water.
For temperature changes that are not listed between the curves,
please consult.
The minimum outlet temperature for the unit will be +5ºC with pure
water and -7ºC with glycol water.
•
Example
For an outlet water temperature of +5ºC:
Minimum  temp.: 2,6ºC

T. condition 7,6ºC / 5ºC
Maximum  temp.: 6,0ºC

T. condition 11ºC / 5ºC
Procedure:
■
At minimum, a complete rinsing of the hydraulic installation
must be performed.
■
After the
fi
nal rinsing, the installation must be completely
drained.
■
Introduce the water/anti-freeze/inhibitor mixture and increase
the pressure with a hydraulic pump.
We recommend using a
fi
lling device with a non-return valve
for compliance with the domestic anti-contamination standards.
The device must never in any case be connected to the
city network if the additives used in the hydraulic circuit are
not approved by the Ministry of Sanitation in the country of
installation.
■
Completely purge the installation.
■
Circulate the mixture throughout the entire installation for a
minimum of 2 hours prior to starting up the unit.
■
Check the final dosage obtained with a densimeter or
refractometer.
■
Check the pH obtained with pH paper strips or a pH metre.
■
Place a label in a visible place that indicates:
-the presence of anti-freeze in the installation,
-the name of the product and the supplier,
-the dosage and the pH as of the time the unit is started up.
9
8
7
6
5
4
3
2
1
10
-7 -6 -4 -2 0 2 4 6 8 10 12 14 16 18
Water outlet temperature °C
Δ
T
Admissible difference between water I/O °C
maximum
Δ
T
minimum
Δ
T