Control Set Up; General; Set Points; Field Adjustments Of Minimum And Maximum Airflow Set Points - Carrier 35L Series Installation And Start-Up Instructions Manual

L1
120VAC
208VAC
240VAC
277VAC
CLASS II
TRANSFORMER
(OPTIONAL)
24VAC
GROUND
BLU
YEL
LEGEND
DDC — Direct Digital Controls
Field Wiring
Factory Wiring
NOTE: Drawing is typical — refer to actual unit wiring diagram for
details.
Fig. 4 — Wiring of Optional Factory-Mounted
Transformer
10000
Largest
1000
Inlet Size
14-16"
12 "
10 "
8 "
6 "
100
10
0.01
FLOW PROBE PRESSURE DIFFERENTIAL IN.WG
VOLTS (ANALOG CONTROLS)
NOTE: Size 16 discharge is same as inlet.
Fig. 5 — Dual Duct Outlet Flow Probe Chart
(35N only)
ANALOG OR DDC
CONTROLLER
24 VAC
POWER
Flow
Constant
0.1
1
10000
1000
100
10
0.01
FLOW PROBE PRESSURE DIFFERENTIAL IN.WG
NOTE: Size 16 discharge is same as inlet.
Fig. 6 — Dual Duct Inlet Flow Probe Chart

General

3709 3709
The 35L,N dual duct terminals are designed to maintain opti-
2840
mum temperatures in the conditioned zone by varying the air
2086
volume supplied by the hot and cold ducts while providing
1449
the proper discharge air temperature.
927
To balance the unit, it is necessary to set both the maximum
and minimum set points of the controllers. Many types of
control options are available and each have specific proce-
dures required for balancing the unit.

Set Points

Maximum and minimum airflow set points are normally
specified for the job and specific for each unit on the job.
Where maximum and minimum airflow levels are not speci-
fied on the order, default values are noted on unit ID label.
Field Adjustment of Minimum and Maximum
Airflow Set Points
Each unit is equipped with a flow probe which measures a
differential pressure proportional to the airflow. The relation-
ship between flow probe pressures and cfm is shown in the
Flow Probe Chart (Fig. 5-7). This chart is attached to each
unit.
7
16 inch
14 inch
12 inch
10 inch
8 inch
6 inch
0.1
VOLTS (ANALOG CONTROLS)
(35N only)

CONTROL SET UP

3665
2840
2086
1449
927
522
1