Page 1
Installation Instructions
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 devices and emergency procedures.
Good judgement should be used in applying any
manufacturer’s instructions to avoid injury to personnel
or damage to equipment and property.
WARNING
35KA,KN,KP06-18
Bypass Terminal Units
for Variable Air Volume Systems
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.
PRE-INSTALLATION
General —
terminal available with factory-installed pneumatic or analog
electronic control options. Figure 1 shows the basic box.
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. If a unit is supplied
with electric or hot water heat, care should be taken to prevent
damage to these devices. Do not lay uncrated units on end or
sides. Do not stack uncrated units over 6 ft high. Do not handle
control boxes by tubing connections or other external attachments. Table 1 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. See 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.
The 35K unit is a single duct, variable volume
Fig. 1 — 35K Bypass Terminal
35KA
Fig. 2 — Unit Identification Label
UNIT SUSPENSION — See Fig. 3 for unit suspension
details. Unit dimensional drawings are shown in Fig. 4-6.
Warranty — All Carrier-furnished items carry the standard
Carrier warranty.
No periodic preventative maintenance required, unless
called for specific control sequence.
Table 1 — 35K Unit Weights
35K
SIZE
06 19 22
08 21 24
10 26 26
12 32 35
14 40 43
16 44 47
18 47 50
NOTE:
1. Unit casing is 20 gage.
2. Unit insulation is
3. Units rated with standard linear flow sensor.
UNIT ONLY
(lb)
1
/2-in. thick, 1.5-lb Tuf-Skin Rx™, dual density.
UNIT WITH ACTUATOR/
CONTROLLER (lb)
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53350002-01 Printed in U.S.A. Form 35K-2SI Pg 1 11-08 Replaces: New
Page 2
FIELD SUPPLIED
HANGING WIRE
BRACKET
DETAIL
Fig. 3 — Typical Unit Suspension with Brackets
TO
AHU
TO VAV
UNITS
35K UNIT
SIZE
06 12
08 127/
10 147/
12 187/
14 187/
16 227/
18 227/
LEGEND
AHU — Air-Handling Unit
DA — Direct Acting
NFPA— National Fire Protection Agency
RA — Reverse Acting
UL — Underwriters Laboratories
VAV — Variable Air Volume
ABCDEF G
7
/
8
8
8
8
8
8
8
FROM
AHU
71/
8
71/
8
81/
8
101/
8
101/
8
121/
8
121/
8
NOTES:
1. Dimensions are in inches.
2. 20 gage steel construction.
3. The “D” dimension is the diameter of the inlet, bypass, and outlet connection.
4. The
5. The damper operates on a 0 to 20 psi thermostat signal.
6. Unit may be field-rotated 180 degrees if necessary to have controls located
on the bottom of the unit.
111/
8
111/
8
131/
8
171/
8
171/
8
211/
8
211/
8
1
/2-in. dual density coated insulation meets NFPA 90A and UL 181.
57/
77/
97/
117/
137/
157/
177/
8
8
8
8
8
8
8
41/
51/
61/
71/
81/
91/
101/
4
4
4
4
4
4
4
Fig. 4 — Bypass Terminal with Pneumatic Controls
123/
123/
143/
183/
183/
223/
223/
a35-639
8
8
8
8
8
8
8
59/
59/
69/
89/
89/
109/
109/
16
16
16
16
16
16
16
2
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a35-640
35K UNIT
SIZE
06 12
08 127/
10 147/
12 187/
14 187/
16 227/
18 227/
ABCDEF G
7
/
8
8
8
8
8
8
8
71/
71/
81/
101/
101/
121/
121/
8
8
8
8
8
8
8
111/
111/
131/
171/
171/
211/
211/
8
8
8
8
8
8
8
57/
77/
97/
117/
137/
157/
177/
8
8
8
8
8
8
8
41/
51/
61/
71/
81/
91/
101/
4
4
4
4
4
4
4
LEGEND
NFPA — National Fire Protection Agency
UL — Underwriters Laboratories
NOTES:
1. Dimensions are in inches.
2. 20 gage steel construction.
3. The “D” dimension is the diameter of the inlet, bypass, and outlet connection.
1
4. The
/2-in. dual density coated insulation meets NFPA 90A and UL 181.
5. The damper operates on a 24 volt thermostat signal.
6. Unit may be field-rotated 180 degrees if necessary to have controls located on the bottom of the unit.
Fig. 5 — Bypass Terminal with Analog Electronic Controls
123/
123/
143/
183/
183/
223/
223/
8
8
8
8
8
8
8
59/
59/
69/
89/
89/
109/
109/
16
16
16
16
16
16
16
3
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35K UNIT
SIZE
06 38
08 383/
10 443/
12 523/
14 523/
16 563/
18 563/
ABCDEFG H JK L
3
/
127/
8
127/
8
147/
8
187/
8
187/
8
227/
8
227/
8
71/
8
71/
8
81/
8
101/
8
101/
8
121/
8
121/
8
51/
8
51/
8
61/
8
61/
8
61/
8
71/
8
71/
8
8
8
8
8
8
8
8
10 51/
10 51/
12 61/
12 81/
12 81/
14 101/
14 101/
111/
4
4
4
4
4
4
4
111/
131/
171/
171/
211/
211/
8
8
8
8
8
8
8
59/
59/
69/
89/
89/
109/
109/
57/
16
57/
16
77/
16
77/
16
97/
16
97/
16
97/
16
57/
8
8
8
8
8
8
8
77/
97/
117/
137/
157/
177/
8
8
8
8
8
8
8
LEGEND
NFPA — National Fire Protection Agency
UL — Underwriters Laboratories
NOTES:
1. Dimensions are in inches.
2. 20 gage steel construction.
3. The “D” dimension is the diameter of the inlet, bypass, and multiple outlet connections.
1
4. The
/2-in. dual density coated insulation meets NFPA 90A and UL 181.
5. The damper operates on a 0 to 20 psi or 24 volt thermostat signal.
Fig. 6 — Bypass Terminal with Pneumatic or Analog Electronic Controls and Multiple Outlets
41/
51/
61/
71/
81/
91/
101/
4
4
4
4
4
4
4
4
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CONTROL ARRANGEMENTS
The 35K bypass terminal unit is 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 by opening and closing
the bypass damper. Stand-alone controls will fulfill the thermal
requirements of a given control space. These devices are available in both pneumatic and electronic arrangements. Control
offerings are:
35KA: Analog electronic
35KP: Pneumatic
35KN: No control or field-supplied control 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
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.
The 4-digit control codes represent the different control arrangements available for the 35K bypass terminal. Refer to the
35K price pages for more information on control codes.
Analog Electronic Control Arrangement — The
damper actuator responds to changes in the thermostat demand.
As the room temperature increases, the room thermostat modulates the room damper open and the bypass damper is closed.
As the room temperature decreases, the room thermostat modulates the room damper closed and the bypass damper is
opened.
All analog electronic control arrangements include a
sheet metal enclosure, flow probe, thermostat, and damper actuator and analog controller.
3500 Electric Temperature Responsive
Pneumatic Control Arrangement — The damper
actuator responds to changes in the thermostat demand. As the
room temperature increases, the room thermostat modulates
the room damper open and the bypass damper is closed. As the
room temperature decreases, the room thermostat modulates
the room damper closed and the bypass damper is opened.
All pneumatic control arrangements include a sheet metal
enclosure, flow probe, damper actuator and pneumatic controller. Thermostats are not included as standard.
1600 Pneumatic DA-NC control
1601 Pneumatic RA-NO control
LEGEND
DA: Direct-acting thermostat
RA: Reverse-acting thermostat
NO: Normally open damper position
NC: Normally closed damper position
The single function controller provides single functions, i.e.,
DA-NO. Multi-function controllers are capable of providing
DA-NO, DA-NC, RA-NC or RA-NO functions.
No Controls or Direct Digital Electronic Control (DDC) Arrangements (Field-Supplied) —
Control packages are field-supplied for factory mounting,
unless otherwise noted. All DDC control arrangements include
a standard linear inlet flow sensor, transformer to 24 volts and
control enclosure.
Contact Carrier for detail about mounting field-supplied
controls.
0000: Field-supplied controls with no controls enclosure
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 on unit as shown
in Fig. 3.
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 unit inlet collar. Check that
air-supply duct connections are airtight and follow all
accepted medium-pressure duct installation procedures.
See 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. An inlet balancing damper should either be included with the
unit (factory-installed option) or field-installed upstream
of the unit in the supply ductwork.
2. Install the discharge duct. When a multiple outlet connector is used on the box, connect appropriately sized ductwork to the outlets. Use adapter caps to seal unused outlets. Fully open all balancing dampers.
3. To ensure use of common-diameter air duct, coordinate
diameters of box inlet and multiple outlet collars.
4. Insulate duct as required.
NOTE: 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.
Step 3 — Make Field Wiring or Piping Connections —
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.
A field-supplied transformer is required if the unit was not
equipped with a factory-installed transformer. A typical analog
electronic control wiring diagram is shown in Fig. 7. A typical
pneumatic control piping diagram is shown in Fig. 8.
Refer to specific unit dimensional submittals and
Table 2 — 35K Basic Pressure Data
35K
SIZE
06 500 110 0.6 0.43 0.03
08 900 185 0.6 0.44 0.03
10 1300 290 0.6 0.38 0.02
12 2000 420 0.6 0.43 0.03
14 2500 580 0.6 0.38 0.02
16 3600 740 0.6 0.44 0.03
18 4400 740 0.6 0.41 0.02
MAXIMUM PRIMARY
AIRFLOW (cfm)
MINIMUM PRIMARY
AIRFLOW (cfm)
MAXIMUM INLET
PRESSURE (psig)
MINIMUM PRESSURE (psig)
100% Bypass 0% Bypass
5
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a35-637
a35-638
Fig. 7 — Typical Wiring — 35KA Analog Electronic Bypass Terminals
Fig. 8 — Typical Pneumatic Piping — 35KP Pneumatic Bypass Terminals
6
Page 7
CONTROL SET UP — BALANCING
The bypass terminal is designed to supply a varying quantity of cold primary air to a space in response to thermostat demand, with the excess air diverted to a secondary discharge
outlet. This type of terminal is not equipped with pressure compensating controls. Instead, the thermostat or pressure dependent controller is directly connected to the actuator. To balance
the unit, it is necessary to establish a pressure balance between
the straight through and full bypass modes of operation. To balance the bypass terminal, perform the following steps:
1. With the actuator fully open (no bypass) and the air system operating normally, establish the desired maximum
cooling or heating airflow to be delivered. Adjust the
factory-installed optional inlet balancing damper or a
field-installed damper installed upstream of the unit until
the desired airflow is reached.
NOTE: Failure to limit the airflow at the inlet of the unit
may result in damper failure under some conditions. Discharge airflow may be determined by established balancing procedures appropriate for balancing the diffusers in
the system.
2. Determine the supply duct inlet pressure.
3. Set the unit actuator to full bypass mode.
4. Adjust the bypass balancing damper so that the inlet duct
pressure is the same as when the actuator was in the fully
open position. This ensures that the position of the bypass
damper will have minimum effect on the operation of the
main air handler.
7
Page 8
Copyright 2008 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53350002-01 Printed in U.S.A. Form 35K-2SI Pg 8 11-08 Replaces: New
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