Step 2 - Make Duct Connections - Carrier 35E Installation And Start-Up Instructions Manual

Step 2 — Make Duct Connections
1. Install supply ductwork on unit inlet collar. Check that
air-supply duct connections are airtight and follow all
accepted medium-pressure duct installation procedures.
(Refer to Table 2 for pressure data.)
NOTE: To ensure proper equipment performance, it is
recommended that a length of rigid straight duct equal to
3 times the duct diameter be provided to the inlet.
MINIMUM AIRFLOW
INLET SIZE
MAXIMUM
(in.)
AIRFLOW
Cooling Only
(Area in
(cfm)
or with Hot
sq ft)
Water
4
230
(0.09)
5
360
(0.14)
6
515
(0.20)
7
700
(0.27)
8
920
(0.35)
9
1160
(0.44)
10
1430
(0.55)
12
2060
(0.78)
14
2800
(1.07)
16
3660
(1.40)
22
7000 1212
(2.63)
LEGEND
DDC Direct Digital Controls
—
EAT Entering Air Temperature
—
UL Underwriters Laboratories
—
P
The difference in static pressure from inlet to discharge
—
S
V
Change in velocity pressure
—
PS
* The ASHRAE Handbook of Fundamentals does not recommend a
discharge temperature exceeding 90 F for satisfactory air mixing
and comfort.
† A minimum of 0.10 in. discharge static pressure is required to
ensure steady operation for the airflow switch in the electric heater.
**Max kW is limited by design.
Table 2 — 35E Basic Pressure Data
(cfm)
ELECTRIC HEAT*
MAX kW vs. CFM
Electric
at 55 F EAT
Heat
55
110
40 55
150
230
85
140
62 85
250
360
110
250
90 110
400
520
140
330
121 140
550
700
190
440
160 190
700
920
240
550
201 240
900
1160
300
700
248 300
1100
1450
425
1000
357 425
1600
2060
580
1375
486 580
2100
2800
750
1775
634 750
2800
3660
1800
3300
1800
5300
7000
2. Install the discharge duct. Fully open all balancing damp-
ers.
NOTE: Ninety degree elbows or tight radius flexible duct im-
mediately upstream of inlet collar should be avoided as these
can affect the balancing of the unit.
MINIMUM INLET STATIC PRESSURE
(Unit and Heat Pressure Drop)
Basic +
Velocity Basic
1-Row
Press. Unit
(V ) (P )
PS S
1.1 0.02 0.01
2.2 0.10 0.05
3** 0.18 0.10
3** 0.43 0.24
1.7 0.02 0.01
2.8 0.06 0.03
5** 0.21 0.10
5** 0.43 0.21
2 0.02 0.01
5.1 0.10 0.04
7.5** 0.25 0.10
7.5** 0.42 0.17
2.9 0.02 0.01
6.7 0.09 0.04
9.5** 0.25 0.10
9.5** 0.40 0.16
3.9 0.02 0.01
9.1 0.09 0.04
13** 0.23 0.10
13** 0.39 0.17
4.9 0.02 0.01
11.3 0.08 0.04
16** 0.23 0.10
16** 0.38 0.17
5.1 0.01 0.01
14.3 0.08 0.04
21** 0.21 0.10
21** 0.36 0.17
8.7 0.01 0.01
20.6 0.08 0.04
30** 0.20 0.10
30** 0.33 0.17
11.9 0.01 0.01
28.2 0.07 0.04
36** 0.16 0.10
36** 0.29 0.18
15.4** 0.01 0.01
36** 0.06 0.04
36** 0.14 0.10
36** 0.24 0.17
36** 0.02 0.01
36** 0.07 0.04
36** 0.17 0.10
36** 0.30 0.17
NOTES:
1. To obtain Total Pressure (P
given cfm to the Static Pressure drop (P
figuration,
e.g., P for a Size 8 Basic Unit at 920 cfm = 0.39 + 0.17 = 0.56
t
2. Maximum discharge temperatures with electric heat are set at
120°F by the National Electric Code.
3. Max kW shown assumes 55°F entering air and is limited by
unit's selected voltage, phase, max capacity and design. Min
cfm for electric heat is based on UL/ETL listings. (Diffuser per-
formance will likely be poor at this low flow rate).
4. Minimums for DDC by others are the responsibility of the con-
trols provider.
4
Basic + Basic + Basic +
2-Row 3-Row
Coil Coil Coil
(P ) (P ) (P )
S S S
0.02 0.02 0.02
0.06 0.07 0.08
0.12 0.13 0.15
0.28 0.31 0.35
0.02 0.02 0.03
0.05 0.06 0.07
0.15 0.19 0.24
0.31 0.40 0.49
0.01 0.02 0.03
0.09 0.13 0.17
0.22 0.34 0.45
0.38 0.57 0.75
0.01 0.02 0.03
0.08 0.12 0.16
0.22 0.33 0.44
0.36 0.53 0.71
0.02 0.03 0.05
0.12 0.19 0.25
0.29 0.47 0.64
0.51 0.81 1.11
0.02 0.03 0.04
0.09 0.14 0.19
0.25 0.38 0.52
0.42 0.64 0.86
0.02 0.03 0.04
0.13 0.21 0.29
0.32 0.53 0.73
0.56 0.91 1.26
0.02 0.04 0.06
0.14 0.22 0.31
0.35 0.57 0.80
0.58 0.95 1.32
0.02 0.04 0.05
0.13 0.21 0.28
0.30 0.48 0.66
0.53 0.85 1.17
0.02 0.04 0.06
0.14 0.22 0.31
0.34 0.56 0.77
0.58 0.95 1.32
0.05 0.09 0.13
0.18 0.30 0.42
0.45 0.77 1.09
0.79 1.35 1.91
), add the Velocity Pressure for a
t
) of the desired con-
S
Basic +
4-Row
Heater†
Coil
(P )
S
(P )
S
0.02 0.01
0.09 0.05
0.16 0.10
0.39 0.24
0.03 0.01
0.09 0.03
0.28 0.10
0.58 0.21
0.03 0.01
0.22 0.04
0.56 0.10
0.94 0.17
0.04 0.01
0.20 0.04
0.54 0.10
0.88 0.16
0.06 0.01
0.32 0.04
0.82 0.10
1.42 0.17
0.05 0.01
0.24 0.04
0.66 0.10
1.09 0.17
0.05 0.01
0.38 0.04
0.93 0.10
1.62 0.17
0.07 0.01
0.40 0.04
1.02 0.10
1.69 0.17
0.06 0.01
0.36 0.04
0.84 0.10
1.49 0.18
0.07 0.01
0.40 0.04
0.99 0.10
1.69 0.17
0.16 0.01
0.55 0.04
1.14 0.10
2.46 0.17