RLC-SVU007D-GB
13
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
Chilled Water Reset (CWR)
Functional Description
The UC800 shall reset the chilled water temperature
setpoint based on return water temperature or outdoor
air temperature. The Return Reset and Outdoor Reset
functions are standard.
The chilled water reset settings are as follows:
1. Reset Type – The following options are selectable: No
Chilled Water Reset, Outdoor Air Temperature Reset,
Return Water Temperature Reset, or Constant Return
Water Temperature Reset.
2. Reset Ratio – For Outdoor Air Temperature Reset,
both positive and negative reset ratios will be
allowed.
3. Start Reset
4. Maximum Reset – The maximum resets shall be with
respect to the chilled water setpoint.
All parameters shall be factory set to a pre determined
set of values. Field adjustment of two, three and four
above is expected to be very infrequent. Pre determined
factory settings shall be set for all Reset Types.
Variable definitions:
CWS – Arbitrated chilled water setpoint, before any reset
has occurred
CWS’ – Active chilled water setpoint, includes the effect
of chilled water reset
CWR – Amount of chilled water reset (also called
Degrees of Reset).
The above quantities are related by the equation:
CWS’ = CWS + CWR
or
CWR = CWS’ – CWS
With the chiller running and any type of chilled water
reset enabled, CWR is allowed to change at a maximum
rate of -17.2°C every 5 minutes until the actual CWR
equals the desired CWR. When the chiller is not running,
actual CWR shall be set equal to the desired CWR within
one minute (no maximum rate is in effect).
If Chilled Water Reset is disabled, desired CWR is 0.
Additional variable definitions:
RESET RATIO – User adjustable gain
START RESET – User adjustable reference
TOD – Outdoor air temperature
TWE – Evaporator entering water temperature
TWL – Evaporator leaving water temperature
MAXIMUM RESET – User adjustable limit providing
the maximum amount of reset.
The equations for each type of reset:
Outdoor Air Temperature Reset
CWR = RESET RATIO * (START RESET – TOD)
With limits:
CWR
> 0
CWR
< Maximum Reset
Return Water Temperature Reset
CWR = RESET RATIO * (START RESET – (TWE –
TWL))
With limits:
CWR
> 0
CWR
< Maximum Reset
Constant Return Water Temperature Reset
CWR = 100% * (Design Delta Temperature –
(TWE – TWL))
With limits:
CWR
> 0
CWR
< Design Delta Temperature
Using the Equations for calculating CWR
Notes for doing calculations:
Equation used to get Degrees of Reset:
Outdoor Air:
Degrees of Reset = Reset Ratio * (Start Reset - TOD)
Return Reset:
Degrees of Reset = Reset Ratio * (Start Reset -
(TWE - TWL))
Const Return:
Degrees of Reset = 100% * (Design Delta Temp -
(TWE - TWL))
To obtain Active CWS from Degrees of Reset:
Active CWS = Degrees of Reset + Arbitrated CWS
Note: Arbitrated CWS can either be Front Panel, BAS,
or External
Reset Ratio calculation:
The Reset Ratio on the User Interface is displayed as a
percentage. To use it in the above equation it must be
converted to its decimal form.
Reset Ratio percent / 100 = Reset Ratio decimal
Example of converting Reset Ratio:
If the Reset Ratio displayed on the User Interface is
50% then use (50/100) = .5 in the equation
TOD
= Outdoor Air Temp
TWE
= Evap Entering Water Temp
TWL
= Evap Leaving Water Temp
