16
Single-Duct and Retrofit Terminal Units IOM
TABLE 6.A: LMHS BASIC PRESSURE AND AIRFLOW DATA
INLET SIZE
(AREA SQFT)
MAX
AIRFLOW
(CFM)
MIN AIRFLOW (CFM)
ELECTRIC HEAT*
MAX Kw PER CFM
@55F EAT
MIN INLET STATIC PRESSURE (UNIT & HEAT PRESSURE DROP)
COOLING
ONLY
OR WITH
HOT WATER
ELECTRIC
HEAT
VELOCITY
PRESS
BASIC
UNIT
BASIC WITH
1R - COIL
BASIC WITH
2R - COIL
BASIC WITH
3R - COIL
BASIC WITH
4R - COIL
BASIC WITH
ELEC HEATER**
CFM
Kw
Δ
Vps
Δ
Ps
Δ
Ps
Δ
Ps
Δ
Ps
Δ
Ps
Δ
Ps
4
(0.09)
230
40
55
55
110
150
230
1
2
2.5
3!
0.02
0.1
0.18
0.43
0.01
0.05
0.1
0.24
0.02
0.06
0.12
0.28
0.02
0.07
0.13
0.31
0.02
0.08
0.15
0.35
0.02
0.09
0.16
0.39
0.01
0.05
0.1
0.24
5
(0.14)
360
62
85
85
140
250
360
1.5
2.5
4.5
5!
0.02
0.06
0.21
0.43
0.01
0.03
0.1
0.21
0.02
0.05
0.15
0.31
0.02
0.06
0.19
0.4
0.03
0.07
0.24
0.49
0.03
0.09
0.28
0.58
0.01
0.03
0.1
0.21
6
(0.20)
515
90
110
110
250
400
520
2
4.5
7.5!
7.5!
0.02
0.1
0.25
0.42
0.01
0.04
0.1
0.17
0.01
0.09
0.22
0.38
0.02
0.13
0.34
0.57
0.03
0.17
0.45
0.75
0.03
0.22
0.56
0.94
0.01
0.04
0.1
0.17
7
(0.27)
700
121
140
140
330
550
700
2.5
6
9.5!
9.5!
0.02
0.09
0.25
0.4
0.01
0.04
0.1
0.16
0.01
0.08
0.22
0.36
0.02
0.12
0.33
0.53
0.03
0.16
0.44
0.71
0.04
0.2
0.54
0.88
0.01
0.04
0.1
0.16
8
(0.35)
920
160
190
190
440
700
920
3.5
8
13!
13!
0.02
0.09
0.23
0.39
0.01
0.04
0.1
0.17
0.02
0.12
0.29
0.51
0.03
0.19
0.47
0.81
0.05
0.25
0.64
1.11
0.06
0.32
0.82
1.42
0.01
0.04
0.1
0.17
9
(0.44)
1160
201
240
240
550
900
1160
4.5
10
16!
16!
0.02
0.08
0.23
0.38
0.01
0.04
0.1
0.17
0.02
0.09
0.25
0.42
0.03
0.14
0.38
0.64
0.04
0.19
0.52
0.86
0.05
0.24
0.66
1.09
0.01
0.04
0.1
0.17
10
(0.55)
1430
248
300
300
700
1100
1450
5.5
13
20.5
21!
0.01
0.08
0.21
0.36
0.01
0.04
0.1
0.17
0.02
0.13
0.32
0.56
0.03
0.21
0.53
0.91
0.04
0.29
0.73
1.26
0.05
0.38
0.93
1.62
0.01
0.04
0.1
0.17
12
(0.78)
2060
357
425
425
1000
1600
2060
8
18.5
30!
30!
0.01
0.08
0.2
0.33
0.01
0.04
0.1
0.17
0.02
0.14
0.35
0.58
0.04
0.22
0.57
0.95
0.06
0.31
0.8
1.32
0.07
0.4
1.02
1.69
0.01
0.04
0.1
0.17
14
(1.07)
2800
486
580
580
1375
2100
2800
11
26
36!
36!
0.01
0.07
0.16
0.29
0.01
0.04
0.1
0.18
0.02
0.13
0.3
0.53
0.04
0.21
0.48
0.85
0.05
0.28
0.66
1.17
0.06
0.36
0.84
1.49
0.01
0.04
0.1
0.18
16
(1.40)
3660
634
750
750
1775
2800
3660
14
33.5
36!
36!
0.01
0.06
0.14
0.24
0.01
0.04
0.1
0.17
0.02
0.14
0.34
0.58
0.04
0.22
0.56
0.95
0.06
0.31
0.77
1.32
0.07
0.4
0.99
1.69
0.01
0.04
0.1
0.17
22
(2.63)
7000
1212
1800
1800
3300
5300
7000
34
36!
36!
36!
0.02
0.07
0.17
0.3
0.01
0.04
0.1
0.17
0.05
0.18
0.45
0.79
0.09
0.3
0.77
1.35
0.13
0.42
1.09
1.91
0.16
0.55
1.41
2.46
0.01
0.04
0.1
0.17
NOTES:
1.
Δ PS is the difference in Static Pressure across the assembly with the damper fully open.
2.
To obtain Total Pressure, add the Velocity Pressure for a given CFM to the Static Pressure. Example: Pt for a Size 8 Basic Unit @925 CFM = 0.39 + 0.17 = 0.56
3.
Max and Min Kw shown assumes 55°F entering air and is limited by unit’s selected voltage, phase and max capacity. Minimum cfm for electric heat is
based on UL/ETL listings.
NOTE:
Diffuser performance will likely be poor at this low flow rate.
4.
Maximum discharge temperatures with Electric Heat are set at 120°F by the National Electric Code.
*
The ASHRAE Handbook of Fundamentals does not recommend a discharge temperature exceeding 90°F.
** A minimum 0.10” discharge static pressure is required to ensure steady operation for the airflow switch in the electric heater.
*** Minimums for DDC by others are the responsibility of the controls’ provider.
!
Max Kw is limited by design.