CG-SVX027D-GB
21
11UNT-PRC002-GB
Sound power levels
Discharge
Measurement conditions:
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
long) fixed to its discharge opening.
Fan Power level in dB(A), per Hz frequency band Overall power
Unit speed 125 250 500 1000 2000 4000 8000 dB(A)
1 55 50 42 37 37 31 30 46
FWD 08 2 57 54 47 40 30 38 40 50
3 58 57 50 42 32 40 43 53
1 57 51 45 42 34 33 28 48
FWD 10 2 58 54 48 45 38 39 35 51
3 60 58 50 48 40 42 39 54
1 57 51 45 42 34 33 28 48
FWD 12 2 58 54 48 45 38 39 35 51
3 60 58 50 48 40 42 39 54
1 56 62 50 48 39 38 36 56
FWD 14 2 61 66 55 53 47 46 45 60
3 63 69 58 56 50 50 49 63
1 57 63 51 49 40 39 37 57
FWD 20 2 61 66 55 53 47 46 45 60
3 63 69 58 56 50 50 49 63
Intake
Measurement conditions:
Measurements taken at the horizontal air intake.
Fan Power level in dB(A), per Hz frequency band Overall power
Unit speed 125 250 500 1000 2000 4000 8000 dB(A)
1 56 55 55 53 46 45 42 57
FWD 08 2 63 62 60 60 53 53 53 64
3 66 65 63 62 56 55 57 67
1 62 58 55 58 51 48 44 61
FWD 10 2 66 63 60 62 56 55 52 66
3 70 67 63 65 59 59 57 69
1 62 58 55 58 51 48 44 61
FWD 12 2 66 63 60 62 56 55 52 66
3 70 67 63 65 59 59 57 69
1 66 65 65 65 57 50 46 68
FWD 14 2 73 72 69 71 64 59 57 74
3 78 76 73 75 69 64 63 78
1 68 72 64 64 56 52 50 69
FWD 20 2 76 76 68 71 65 61 61 75
3 78 79 71 74 69 66 66 78
Installation – Mechanical
Freeze Protection
If the unit is exposed to ambient temperatures below
0°C, the chilled water system must be protected from
freezing following one of the options shown below:
1. Heaters
a. Heaters can be factory-installed (option) on the
evaporator and water piping and will protect it from
freezing in ambient temperatures down to -18°C.
AND
b. Install, outside the unit, heat tape on all water piping,
pumps, and other components that may be damaged
if exposed to freezing temperatures. Heat tape must be
designed for low ambient temperature applications. Heat
tape selection should be based on the lowest expected
ambient temperature.
OR
2. Freeze inhibitor
a. Add a freeze inhibitor fluid to the chilled water
system. The solution must be strong enough to provide
protection against ice formation at the lowest anticipated
ambient temperature.
Note: Use of a freeze inhibitor fluid reduces the cooling
capacity of the unit and must be considered in the
design of the system specifications.
3. Water pump
a: Chiller controller can start the pump to prevent
freezing. This function needs to be validated, pump has
to be controlled by the unit and water circuit valves
need to stay open at all times. This protection will be
efficient to protect the unit, if the water loop is reduced.
The installation of a bypass is advised.
If ambient temperatures below -18°C, the water circuit
must be protected against freezing.
Add a freeze inhibitor fluid and activate the heat tape on
the unit; do not shut the unit down.
It is not recommended to drain the water circuit for the
following reasons:
1. The water circuit will rust and its lifetime could be
reduced.
2. Water will remain in the bottom of the plate heat
exchangers and freeze damage could occur.
Note: If water pump control is enabled form the chiller
controller, it will request start of customer pump during
ambient air temperatures below freezing.
CAUTION! When using freeze inhibitor, never fill the
system with pure glycol. Always fill the system with
diluted solution. Maximum concentration of glycol is
40%. Higher glycol concentration will damage pump
seal.
Note: Never fill high Glycol concentration at the pump
suction as there is a high risk to damage pump seal.
In case of winter water drainage for freeze protection, it
is compulsory to disconnect the evaporators heaters to
protect them from burning due to overheat.
Note: Water pump control and heater combination will
protect the evaporator down to any ambient temperature
provided power is available to the pump and the
controller. This option will NOT protect the evaporator
in the event of power failure to the chiller unless backup
power is supplied to the necessary components.
The warranty will be void, in case of freezing due to the
lack of use of either of these protections.
Low refrigeration temperature setpoint and antifreeze
setpoint on chiller controller
CAUTION! The chiller is provided with standard factory
settings. It can be necessary to modify the Low Pressure
saturation Temperature and the Antifreeze Setpoint
on the unit control. Based on the following examples,
it is necessary to modify on the chiller controller the
following settings:
• The LP saturation temperature (LRTC)
• The antifreeze setpoint (LWTC)
Examples:
For:
• 7°C, the LP setting must be -4°C where the antifreeze
setting shall be 2°C
• 2°C, the LP setting must be -9°C where the antifreeze
setting shall be -4°C
• -12°C, the LP setting must be -23°C where the
antifreeze setting shall be -17°C
Freeze protection with glycol
It is mandatory to use a freeze inhibitor for leaving
water setpoint less or equal to 5°C. On the glycol
recommended concentration figure, you must select
concentration on or above the curve. For example, for
-4°C brine temperature, a concentration of 25% ethylene
glycol is not sufficient. The concentration must be 28%
ethylene glycol or 33% propylene glycol.
Using glycol with hydraulic module
If the glycol brine percentage is not at the recommended
percentage (greyed area), corrosion inhibitor present
in the glycol may not be efficient enough. For instance,
a glycol concentration of 15% will provide freeze
protection to the unit down to -5°C, but it might generate
additional corrosion.
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