11
UNT-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
CG-SVX051A-GB
31
An air vent is located on top of the Chilled/Hot Water
Exchanger at the unit water outlet. Be sure to provide
additional air vents at the highest points in the piping
to remove air from the chilled water system. Install
necessary pressure gauges to monitor the entering and
leaving water pressure.
Provide shut off valves in lines to the gauges to isolate
them from the system when they are not in use. Use
rubber vibration eliminators to prevent vibration
transmission through the water lines.
If desired, install thermometers in the lines to monitor
entering and leaving water temperatures.
Install a balancing valve in the leaving water line to
control water flow balance.
Install shutoff valves on both the entering and leaving
water lines so that the Chilled/Hot Water Exchanger can
be isolated for service.
CAUTION!
The water connections to the chilled/ hot
water exchangers have to be “grooved pipe” type
connections. Do not attempt to weld these connections,
because the heat generated from welding can cause
microscopic and macroscopic fractures on the heat
exchanger connection that can lead to premature failure
of the connection. An optional grooved pipe stub and
coupling should be used for welding on flanges.
To prevent damage to chilled-water components, do not
allow Chilled/Hot Water Exchanger pressure (maximum
working pressure) to exceed 10 Bar. The maximum
service pressure depends on free cooling type and
potential pump package option. The value of max service
pressure is indicated on unit nameplate.
Entering Water Piping
•
Air vents to bleed the air from the system (to be
placed on the highest point)
•
Water pressure gauges with shutoff valves
•
Vibration eliminators
•
Shutoff (isolation) valves
•
Thermometers if desired (temperature readings
available on unit controller display)
•
Clean-out tees
•
Pipe strainer
Leaving Water Piping
•
Air vents to bleed the air from the system (to be
placed on the highest point)
•
Water pressure gauges with shut off valves
•
Vibration eliminators
•
Shutoff (isolation) valves
•
Thermometers (temperature readings available on
the unit controller display)
•
Clean-out tees
•
Balancing valve
•
Flow Proving Device
Pressure Gauges
Install field-supplied pressure components. Locate
pressure gauges or taps in a straight run of pipe; avoid
placing them near elbow (at least at 10 pipe diameter
from discontinuity).
To read manifold pressure gauges, open one valve and
close the other (depending on the side of the desired
reading), this eliminate errors resulting from differently
calibrated gauges installed at unmatched elevations.
Chilled/Hot Water Flow Switch
Both chilled water / hot water pipes are equipped with a
thermal dispersion flow switch.
Specific connection and schematic wiring diagram are
shipped within the unit. Some piping and control
schemes, particularly those using a single water pump
for both chilled and hot water, must be analyzed to
determine how and/or if a flow sensing device will
provide the desired operation.
Flow Switch Installation – Typical
Requirements
The flow switch permits to detect whether there is a flow
while the pump command is engaged.
It is set from factory to its maximum (Table 7) to
fit most applications however it shall be revised at
commissioning.
This specification is a guide and when setup is
completed it needs to be verified by test of switch ON/
OFF
Note:
1. Make sure the loop is plenty of water and purged
from any air.
2. In case of winter water drainage for freeze
protection, it is mandatory to disconnect the
exchanger’s heaters to protect them from burning
due to overheat. It is also mandatory to fulfill the
drainage, using pressurized air, and ensure that no
water remains in exchangers during winter season.
Flow Switch setting:
The detection flow rate must be defined as the highest
value between:
1. 20 and 50% of the full water flow rate
2. The minimum detection flow rate (Table 6) and the
maximum detection flow rate (Table 7).
For applying the setting to the sensor, the detection flow
rate shall be converted into setting duration (in second),
see Figure 6 for converting.
To fit wide range of application that setting may be
adjusted by few second steps:
1. Increase the detection flow rate in case of erratic
flow losses
2. Decrease the detection flow rate in case of the flow
switch does cutout over the desired detection flow rate
Chilled/hot Water Piping
