35L,N Dual Duct Terminal Units
Variable Volume System
Installation and Start-Up Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ...................... 1
PRE-INSTALLATION.............................. 2
General ..........................................2
Warranty ......................................... 2
CONTROL ARRANGEMENTS................... 2-7
CCN Control Arrangement........................3
Analog Electric Control Arrangement ............ 3
Direct Digital Electronic Control
Arrangement (Field Supplied)................... 3
Pneumatic Control Arrangement .................3
No Control ....................................... 3
INSTALLATION ................................. 3-6
Step 1 — Install Volume Control Box .............3
Step 2 — Make Duct Connections ................3
Step 3 — Install Sensors and Make Field
Wiring Connections — Electronic Analog
or DDC (Direct Digital Controls) ................3
CONTROL SET UP ..............................6,7
General ..........................................6
Set Points ........................................6
Field Adjustments of Minimum and
Maximum Airflow Set Points ................... 6
System Calibration of the Linear Averaging
Flow Probe.....................................6
PNEUMATIC CONTROLS ........................7,8
Preparation for Balancing ........................7
Balancing Procedure
(Control Sequences 1500-1523) ................ 7
Preventative Maintenance ........................ 8
Pneumatic Control Troubleshooting..............8
ANALOG CONTROLS ..........................9,10
Balancing Procedures
(Control Sequences 2400, 2440 and 2470) ......9
Applications for Dual Duct (Minimum Air
from Cold Duct) .................................. 9
Analog Control Troubleshooting ................ 10
ComfortID™ CONTROLS ..................... 10-18
Install Sensors and Make
Field-Wiring Connections .....................10
• GENERAL
• SUPPLY-AIR TEMPERATURE SENSOR
INSTALLATION
• SPACE TEMPERATURE SENSOR INSTALLATION
AND WIRING
• WIRING THE SPACE TEMPERATURE SENSOR
AND SET POINT ADJUSTMENT SLIDEBAR
• WIRINGTHECCNNETWORKCOMMUNICATION
SERVICE JACK
• PRIMARY AIR TEMPERATURE SENSOR
INSTALLATION
• INDOOR-AIR QUALITY SENSOR INSTALLATION
• INDOOR-AIR QUALITY SENSOR WIRING
• HUMIDITY SENSOR (Wall-Mounted) INSTALLATION
Connect the CCN Communication Bus..........15
• COMMUNICATION BUS WIRE SPECIFICATIONS
• CONNECTION TO THE COMMUNICATION BUS
ComfortID Controls Start-Up ....................16
• GENERAL
• PRIMARY SYSTEM CHECK
• COMFORTID CONTROL SYSTEM CHECK
CCN System Start-Up ........................... 17
• COMFORTID TEST AND BALANCE TOOL
SOFTWARE
• COMFORTID CONSTANT VOLUME DUAL DUCT
CONTROL PACKAGE NO. 4160
• COMFORTID VARIABLE AIR VOLUME DUAL
DUCT WITH CONSTANT MINIMUM COLD DECK
AIRFLOW CONTROL PACKAGE NO. 4170
• COMFORTID VARIABLE AIR VOLUME DUAL
DUCTWITHCOLDDECKCLOSE-OFFCONTROL
PACKAGE NO. 4175
• COMFORTID VARIABLE AIR VOLUME DUAL
DUCT WITH CONSTANT VENTILATION CONTROL
PACKAGE NO. 4180
• COMFORTID VARIABLE AIR VOLUME DUAL
DUCT WITH DEMAND CONTROL VENTILATION
CONTROL PACKAGE NO. 4190
SAFETY CONSIDERATIONS
SAFETY NOTE
Air-handling equipment will provide safe and reliable
service when operated within design specifications. The
equipment should be operated and serviced only by authorized personnel who have a thorough knowledge of system
operation, safety devicesand emergency procedures.
Good judgement should be used in applying any manufacturer’s instructions to avoid injury to personnel or damage to equipment and property.
Disconnect all power to the unit before performing maintenance or service. Unit may automatically start if power is
not disconnected. Electrical shock and personal injury
could result.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 3
Ta b 6 a
Catalog No. 04-53350001-01 Printed in U.S.A. Form 35L,N-1SI Pg 1 3-06 Replaces: 35L,M,N-1SI
PRE-INSTALLATION
General —
The 35L,N units are dual duct terminals available with factory-installed pneumatic, analog, and Carrier
ComfortNetwork®(CCN)DirectDigitalControl(DDC)
control options. See Table 1. Figure 1 shows the basic box.
Figure 2 is an example of a unit identification label.
Table 1 — 35L,N Units
UNIT DESCRIPTION
35L Basic unit, no mixing
35N Premium unit, high mixing, constant volume flow sensing
STORAGE AND HANDLING — Inspect for damage upon
receipt. Shipping damage claims should be filed with shipper
at time of delivery. Store in a clean, dry, and covered location.
Do not stack cartons. When unpacking units, care should be
taken that the inlet collars and externally mounted components
do not become damaged. Do not lift units using collars, sensors
or externally mounted components as handles. Do not lay
uncrated units on end or sides. Do not stack uncrated units over
6 ft high. Do not manhandle. Do not handle control boxes by
tubing connections or other external attachments. Table 2
shows component weights.
INITIAL INSPECTION — Once items have been removed
from the carton, check carefully for damage to duct connections, coils or controls. File damage claim immediately with
transportation agency and notify Carrier.
UNIT IDENTIFICATION — Each unit is supplied with a
shipping label and an identification label (Fig. 2).
INSTALLATION PRECAUTION — Check that construction
debris does not enter unit or ductwork. Do not operate the
central-station air-handling fan without final or construction
filters in place. Accumulated dust and construction debris
distributed through the ductwork can adversely affect unit
operation.
SERVICE ACCESS — Provide service clearance for unit
access.
CODES — Install units in compliance with all applicable code
requirements.
ODS: 2181487
TAG:
FACTORY NO: 832889 ITEM: 003
MODEL NO: 35LN 06
MIN
COLD INLET CFM:
MAX
HOT INLET CFM:
HAND (COLD INLET LOC):
CFGCD: 1A*0*0*0R*0606*D000*00*000*0000
0
RC
D000 CTRL BOX E
SIZE: C=06 H=06
VP:
VP:
Fig. 2 — Unit Identification Label
Table 2 — 35L,N Unit Weights
UNIT SIZE
35L
35N
DDC — Direct Digital Controls
NOTE: Data is based on the following conditions:
1. Unit casing is 22 gage.
2. Unit insulation is
fiberglass.
3. Units rated with standard linear flow sensor.
BASE
UNIT
(lb)
4, 5, 6 29 37 47
7, 8 33 41 51
9, 10 41 49 59
12 51 59 69
14 67 75 85
16 75 83 93
22 129 137 147
6 31 39 49
8 42 50 60
10 61 69 79
12 80 88 98
14 98 106 116
16 111 119 129
LEGEND
1
WITH
PNEUMATIC
CONTROLS
(lb)
/2-in. thick, 1.5-lb Tuf-Skin Rx™ dual density
ANALOG CONTROLS
UP
MAX
MIN
.000
.000
.000
.000
WITH DDC OR
(lb)
Fig. 1 — 35L Dual Duct Box
Warranty — All Carrier-furnished items carry the standard
Carrier warranty.
CONTROL ARRANGEMENTS
The 35L,N dual duct units are offered with a wide variety of
factory-mounted controls that regulate the volume of air delivery from the unit and respond to cooling and heating load
requirements of the conditioned space. Stand-alone controls
will fulfill the thermal requirements of a given control space.
These devices are available in both pneumatic and electronic
arrangements. Carrier PIC (Product Integrated Controls) is a
communicating control that is integrated with the building system. The PIC controls are compatible with the CCN system. A
number of DDC (Direct Digital Controls) control packages by
others are available for consignment mounting, as indicated.
Control offerings are:
35(L,N)A: Analog Electronic
35(L,N)C: CCN Direct Digital Electronic
35(L,N)P: Pneumatic
35(L,N)N: None or DDC by others
Each control approach offers a variety of operating functions; a control package number identifies combinations of
control functions. The following listings contain the basic
function arrangements for each control offering. Because of the
2
variety of functions available, circuit diagrams, operating sequences, and function descriptions are contained in separate
Application Data publications. Refer to the specific control
publication for details.
CCN Control Arrangement — The CCN control
packages must be used in combination with a thermostat. Thermostats are not included in the CCN package.
4160: Constant volume dual duct
4170: 35N only, variable volume dual duct, constant minimum
cooling (requires cold deck inlet and total flow probe)
4175: 35N only, variable volume dual duct, cooling close-off
during heating (requires hot deck inlet and total flow probe)
4180: 35N only, constant ventilation dual duct, Cooling only
(requires cold deck inlet and total flow probe)
4190: Variable air volume (VAV) with Demand Control Venti-
lation (DCV) requires separate CO
sensor
2
Analog Electronic Control Arrangement — Con-
trol package is pressure independent and includes a standard
linear airflow sensor in both the hot and cold inlets for variable
air volume control, 24-volt transformer, control enclosures,
and a wall thermostat to match the control type.
Variable volume control:
2400 — Heating and cooling control, hot and cold inlet sensor
location (35L,N)
2440 — Heating and cooling control, hot inlet and discharge
airflow sensing (35N only)
2470 — Heating and cooling control, cold inlet and discharge
airflow sensing (35N only)
Direct Digital Electronic Control Arrangement
(Field Supplied) — Control packages are field supplied
for factory mounting, unless otherwise noted. All DDC control
arrangements include a standard linear inlet flow sensor,
24-volt transformer and control enclosure.
Contact Carrier for details about mounting field-supplied
controls.
Pneumatic Control Arrangement — All control pack-
ages are pressure independent and include standard linear
airflow sensors in both the hot and cold inlets for variable air
volume control or an airflow sensor in one inlet and the unit
discharge for constant volume control arrangements. Thermostats will either be direct acting (DA) or reverse acting (RA),
and damper position will be identified as normally open (NO)
or normally closed (NC).
Variable air volume control with inlet air sensing (all units):
1500 — Multi-function controller, DA-NC cold inlet, NC
hot inlet
1501 — Multi-function controller, DA-NC cold inlet, NO
hot inlet
1502 — Multi-function controller, DA-NO cold inlet, NO
hot inlet
1503 — Multi-function controller, DA-NO cold inlet, NC
hot inlet
1504 — Multi-function controller, RA-NC cold inlet, NC
hot inlet
1505 — Multi-function controller, RA-NC cold inlet, NO
hot inlet
1506 — Multi-function controller, RA-NO cold inlet, NO
hot inlet
1507 — Multi-function controller, RA-NO cold inlet, NC
hot inlet
Constant volume control with hot inlet and discharge air
sensing (35N Units):
1508 — Multi-function controller, DA-NC cold inlet, NC
hot inlet
1509 — Multi-function controller, DA-NC cold inlet, NO
hot inlet
1510 — Multi-function controller, DA-NO cold inlet, NO
hot inlet
1511 — Multi-function controller, DA-NO cold inlet, NC
hot inlet
1512 — Multi-function controller, RA-NC cold inlet, NC
hot inlet
1513 — Multi-function controller, RA-NC cold inlet, NO
hot inlet
1514 — Multi-function controller, RA-NO cold inlet, NO
hot inlet
1515 — Multi-function controller, RA-NO cold inlet, NC
hot inlet
Constant volume control with cold inlet and discharge air
sensing (35N units):
1516 — Multi-function controller, DA-NC cold inlet, NC
hot inlet
1517 — Multi-function controller, DA-NC cold inlet, NO
hot inlet
1518 — Multi-function controller, DA-NO cold inlet, NO
hot inlet
1519 — Multi-function controller, DA-NO cold inlet, NC
hot inlet
1520 — Multi-function controller, RA-NC cold inlet, NC
hot inlet
1521 — Multi-function controller, RA-NC cold inlet, NO
hot inlet
1522 — Multi-function controller, RA-NO cold inlet, NO
hot inlet
1523 — Multi-function controller, RA-NO cold inlet, NC
hot inlet
A multi-function controller is capable of providing DA-NO,
DA-NC, RA-NC or RA-NO functions (all units).
No Control
0000: 35L,N box only
D000: 35L,N box with control box only
D001: 35L,N box with control box and transformer
INSTALLATION
Step 1 — Install Volume Control Box
1. Move unit to installation area. Remove unit from shipping package. Do not handle by controls or damper
extension rod.
2. The unit has factory-installed brackets.
3. Suspend units from building structure with straps, rods,
or hanger wires. Secure the unit and level it in each direction.
Step 2 — Make Duct Connections
1. Install supply ductwork on each of the unit inlet collar.
Check that air-supply duct connections are airtight and
follow all accepted medium-pressure duct installation
procedures. (Refer to Tables 3-5 for pressure data.)
2. Install the discharge ducts. Fully open all balancing
dampers.
A straight length of inlet duct is not required before the unit
inlet. Ninety-degree elbows or tight radius flexible duct immediately upstream of inlet collar should be avoided.
3
Step 3 — Install Sensors and Make Field Wiring
Connections — Electric Analog or DDC (Direct
Digital Controls) —
submittals and control application diagrams for control specifications. All field wiring must comply with National Electrical
Code (NEC) and local requirements. Refer to the wiring diagram
on the unit for specific wiring connections.
INLET
SIZE
(0.09)
(0.14)
(0.20)
(0.27)
(0.35)
(0.44)
(0.55)
(0.78)
(1.07)
(1.40)
(2.63)
*CCN (Carrier Comfort Network®) controls permit a lower minimum
flow.
NOTES:
1. ∆ P
2. To obtain Total Pressure, add the Velocity Pressure for a
CFM
(in.)
4
5
6
7
8
9
1200 0.40 0.32
10
1075 0.20 0.10
1450 0.36 0.17
12
1000 0.08 0.04
1550 0.19 0.09
2100 0.34 0.17
14
1375 0.07 0.04
2125 0.17 0.10
2900 0.31 0.19
16
1775 0.06 0.04
2725 0.14 0.10
3700 0.25 0.17
1200
22
3300 0.07 0.04
5200 0.16 0.09
7000 0.31 0.17
is the difference in static pressure across the assembly,
s
with the damper fully open.
givenCFMtotheStaticPressuredrop(∆ P
configuration.
MINIMUM AIRFLOW
50
110 0.10 0.01
170 0.23 0.02
230 0.43 0.03
75
170 0.09 0.02
265 0.23 0.04
360 0.43 0.08
100
240 0.09 0.04
380 0.22 0.09
520 0.42 0.17
150
330 0.09 0.04
525 0.23 0.09
710 0.41 0.17
200
440 0.09 0.04
675 0.21 0.09
925 0.39 0.17
250
550 0.08 0.07
875 0.21 0.17
300
675 0.08 0.04
450
600
800
Refer to specific unit dimensional
Table 3 — 35L Non-Mixing Dual Duct Basic Pressure Data
(CFM)*
40
or
0
63
or
0
90
or
0
123
or
0
160
or
0
203
or
0
251
or
0
361
or
0
491
or
0
642
or
0
1211
or
0
MINIMUM CCN
AIRFLOW (CFM)
23
or
0
36
or
0
52
or
0
71
or
0
93
or
0
117
or
0
145
or
0
208
or
0
284
or
0
371
or
0
699
or
0
) of the desired
s
A field-supplied transformer is required if the unit was not
equipped with a factory-installed transformer. See Fig. 3.
NOTE: Refer to wiring diagram attached to each unit for
specific information on that particular unit.
Unit airflow should not be set outside of the range noted in
Fig. 4A-4C and the performance data section of this document.
MINIMUM INLET STATIC PRESSURE
(Unit Pressure Drop) (in. wg)
Veloc it y
Pressure
∆ V
PS
0.02 0.00
0.02 0.00
0.02 0.01
0.02 0.01
0.02 0.01
0.02 0.01
0.02 0.01
0.02 0.01
0.01 0.01
0.01 0.01
0.02 0.01
Basic
Unit
∆ P
S
MINIMUM SYSTEM OPERATING
PRESSURE (in. wg) AT
MAXIMUM LISTED FLOW RATE
0.03
0.08
0.17
0.17
0.18
0.31
0.17
0.17
0.18
0.18
0.17
4
Table 4 — 35N Dual Duct, Full Blending Basic Pressure Data — Inlet Sensor Pickup
MINIMUM INLET STATIC PRESSURE
INLET
SIZE
(Area)
6
(0.20)
8
(0.35)
10
(0.55)
12
(0.78)
14
(1.07)
16
(1.40)
*Assumes inlet flow sensor. For discharge flow sensor, use data for
next even size. CCN (Carrier Comfort Network®) controls permit a
lower minimum flow. Size 16 discharge is same as inlet.
NOTES:
is the difference in static pressure across the assembly,
1. ∆P
s
with the damper fully open.
2. Minimum recommended airflow (cfm) is based on 0.03 in. wg
differential pressure on the inlet sensor or 0 airflow. 0.03 in. wg
is equal to 15-20% of the nominal flow rating of the terminal
MINIMUM AIRFLOW
CFM
100
240 0.06 0.16
380 0.15 0.40
520 0.28 0.72
200
440 0.06 0.15
675 0.14 0.36
925 0.26 0.68
300
675 0.05 0.20
1075 0.14 0.52
1450 0.25 0.94
450
1000 0.04 0.18
1550 0.09 0.44
2100 0.16 0.80
600
1375 0.04 0.23
2125 0.09 0.54
2900 0.17 1.01
800
1775 0.02 0.19
2725 0.04 0.44
3700 0.08 0.81
(CFM)
90
or
0
160
or
0
251
or
0
361
or
0
491
or
0
642
or
0
MINIMUM CCN
AIRFLOW (CFM)
52
or
0
93
or
0
145
or
0
208
or
0
284
or
0
371
or
0
(Unit Pressure Drop) (in. wg)
Velocity
Pressure
∆ V
PS
Basic
Unit
∆ P
0.01 0.03
0.01 0.03
0.01 0.04
0.01 0.04
0.01 0.04
0.00 0.04
unit. Less than 15-20% may result in greater than ±5% control
of the unit airflow. Some DDC controls, supplied by others, may
have different limitations.
3. Minimum airflow may be 0.
4.Maximumairflow(cfm)isbasedona1in.wgdifferential
pressure from the airflow sensor.
5. To obtain Total Pressure, add the Velocity Pressure for a
givenCFMtotheStaticPressuredrop(∆P
configuration.
MINIMUM SYSTEM OPERATING
PRESSURE (in. wg) AT
MAXIMUM LISTED FLOW RATE
S
0.42
0.44
0.43
0.43
0.48
0.48
) of the desired
s
Table 5 — 35N Dual Duct, Full Blending — Discharge Sensor Pickup
INLET
SIZE
MAX. PRIMARY
AIRFLOW (cfm)
6 927 185 or 0 93 or 0
8 1448 290 or 0 145 or 0
10 2085 417 or 0 208 or 0
12 2838 568 or 0 284 or 0
14
16
3706 741 or 0 371 or 0
CCN — Carrier Comfort Network
MINIMUM AIRFLOW
Standard CCN
5
L1
120VAC
208VAC
240VAC
277VAC
CLASS II
TRANSFORMER
(OPTIONAL)
ANALOG OR DDC
CONTROLLER
GROUND
24VAC
BLU
YEL
24 VAC
POWER
LEGEND
DDC — Direct Digital Controls
Field Wiring
Fac to ry Wiring
NOTE: Drawing is typical — refer to actual unit wiring diagram for
details.
Fig. 3 — Wiring of Optional Factory-Mounted
Transformer
10000
1000
16 inch
14 inch
CFM
100
10
12 inch
10 inch
8 inch
6 inch
0.01
FLOW PROBE PRESSURE DIFFERENTIAL IN.WG
VOLTS (ANALOG CONTROLS)
0.1
NOTE: Size 16 discharge is same as inlet.
Fig. 4B — Dual Duct Inlet Flow Probe Chart
(35N only)
3665
2840
2086
1449
927
522
CFM AT ONE INCH SIGNAL
1
10000
1000
CFM
100
10
0.01
Largest
Inlet Size
14-16"
12 "
10 "
8 "
6 "
0.1
FLOW PROBE PRESSURE DIFFERENTIAL IN.WG
VOLTS (ANALOG CONTROLS)
NOTE: Size 16 discharge is same as inlet.
Fig. 4A — Dual Duct Outlet Flow Probe Chart
(35N only)
Flow
Constant
37093709
2840
2086
1449
927
CFM AT ONE INCH SIGNAL
1
CONTROL SET UP
General —
maintain optimum temperatures in the conditioned zone by
varying the air volume supplied by the hot and cold ducts while
providing the proper discharge air temperature.
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, each have specific procedures required for balancing the unit.
The 35L,N dual duct terminals are designed to
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
specified on the order, default values are noted on unit ID label.
Field Adjustment of Minimum and Maximum
Airflow Set Points —
probe which measures a differential pressure proportional to
the airflow. The relationship between flow probe pressures and
cfm is shown in the Flow Probe Chart (Fig. 4A-4C). This chart
is attached to each unit.
Each unit is equipped with a flow
System Calibration of the Linear Averaging
Flow Probe —
operation, the velocity sensor and linear averaging flow probe
must be calibrated to the controller. This will ensure that airflow measurements will be accurate for all terminals at system
start-up.
System calibration is accomplished by calculating a flow
coefficient that adjusts the pressure fpm characteristics. The
flow coefficient is determined by dividing the flow for a given
unit (design air volume in cfm), at a pressure of 1.0 in. wg
differential pressure, by the standard pitot tube coefficient of
4005. This ratio is the same for all sizes if the standard linear
averaging probe is used.
Determine the design air velocity by dividing the design air
volume (the flow at 1.0 in. wg) by the nominal inlet area
(sq ft). This factor is the K factor.
To achieve accurate pressure independent
6
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