Carrier 45Q user guide manual

45J,M,K,N,Q,R

Variable Air Volume Terminals

Installation, Start-Up and

Service Instructions

Fan Powered

CONTENTS

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1

PRE-INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Unit Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

CONTROL OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

ComfortID™ VAV Controls . . . . . . . . . . . . . . . . . . . . . . . 4

3V™ VVT® Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Analog Electric Controls . . . . . . . . . . . . . . . . . . . . . . . . . 4

Pneumatic Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

No Controls or Direct Digital Controls

(By Others) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

Step 1 — Install Fan Powered Box. . . . . . . . . . . . . . . . 6

Step 2 — Make Duct Connections . . . . . . . . . . . . . . . . 6

Step 3 — Connect Power Wiring. . . . . . . . . . . . . . . . . . 6

Step 4 — Set Up System and Calibrate . . . . . . . . . . . 8

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-16

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Initial Start-Up Procedures . . . . . . . . . . . . . . . . . . . . . . . 9

Balancing Carrier Fan Terminals . . . . . . . . . . . . . . . . 10

Speed Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

ComfortID VAV CONTROLS . . . . . . . . . . . . . . . . . . 16-23

Install Sensors and Make Field Wiring

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Connect the CCN Communication Bus . . . . . . . . . . 22

Water Valve Installation . . . . . . . . . . . . . . . . . . . . . . . . . 22

ComfortID Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

CCN System Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3V VVT CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . 24-43

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Initial Operation and Test. . . . . . . . . . . . . . . . . . . . . . . . 42

Fan and Heat Configuration and Test. . . . . . . . . . . . 43

System Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

PNEUMATIC CONTROLS . . . . . . . . . . . . . . . . . . . . . 43-46

General — Single Function Pneumatic Controller

Control Sequences (1300-1305, 1400-1401). . . . 43

Units with Single-Function Controllers . . . . . . . . . . 43

Units with Multi-Function Controllers

(Sequences 1306-1317 and 1402-1405). . . . . . . . 45

Operation Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

ANALOG CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . 46-48

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

System Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Thermostat Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Controller Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48,49

Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Fan Motor and Wheel. . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Fan Motor Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Fan Motor Maintenance

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53450002-01 Printed in U.S.A. Form 45-3SI Pg 1 12-08 Replaces: 45-1SI

. . . . . . . . . . . . . . . . . . . . . . . . . 48

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.

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.

If it is necessary to remove and dispose of mercury contac­tors in electric heat section, follow all local, state, and fed­eral laws regarding disposal of equipment containing
hazardous materials.

General —

45M,N,R variable volume (parallel) fan powered boxes (see
Fig. 1 and 2) can be equipped to provide pressure independent,
variable volume (VAV). All units can also be equipped with
factory-installed analog electronic, pneumatic, or ComfortID™
variable air volume (VAV) controls. The 45M,N,R units can be
equipped with 3V™ variable volume and temperature (VVT)
controls. Units are available with factory-installed electric or
hot water heat.

SAFETY CONSIDERATIONS

SAFETY NOTE

WARNING

WARNING

PRE-INSTALLATION

The 45J,K,Q constant volume (series) and

Fig. 1 — Series Flow Unit (45K Shown)

Fig. 2 — Parallel Fan Unit (45J Shown)

The 45J,M units are standard fan powered terminal units.
The 45K,N units are quiet fan powered terminal units. The
45Q,R units are low profile fan powered terminal units.

CONTROL OFFERINGS — Each 45J, 45K, 45M, 45N, 45Q,
45R unit is supplied with a linear averaging flow probe as a
standard feature. This probe offers a flow averaging capability
and results in flow sensing capacity equal to any competitive
unit.

Control options include ComfortID™ VAV, 3V variable
volume and temperature (VVT®), analog electronic and pres­sure-independent pneumatic. Both 3V and ComfortID controls
are communicating controls that are compatible with the Carri­er Comfort Network® (CCN) network. The 3V VVT controls
are for 45M,N,R units only.

Pneumatic controls are available with linear actuators and
single-function or multi-function controller. The multi-function
controller provides a simple switchover from normally open to
normally closed applications.

Electronic control units feature a factory-installed enclosure
that provides easy access for field connections.

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 units. 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 man­handle. 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 packing, check carefully for damage to duct connections,
coils, or controls. File damage claim immediately with trans­portation agency and notify Carrier.

NOTE: Remove all packaging material and foreign material
from unit and ensure the blower wheel moves freely before
installation. Units are shipped with cardboard in both sides of
the fan inlet that MUST be removed.

Unit Identification — Each unit has 2 main labels at-

tached to the casing. The FAN UNIT label (Fig. 3) lists the
model number, supply voltage requirements, motor horsepow­er and overcurrent protection requirements. The AIRFLOW
label (Fig. 4) lists the model number, unit size, factory order
number and location. The location “tag” indicates where the
unit is intended for installation. There may be other labels at­tached to the unit, as options or codes may require. Read all
labels on a typical unit before attempting installation. Control
boxes are assembled as indicated on the identification label.

Contact your local Carrier representative for more

information.
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 (see Installation section for details).

CODES — Install units in compliance with all applicable code
requirements.

UNIT SUSPENSION — See Installation section for unit sus­pension details.

Warranty — All Carrier-furnished items carry the standard

Carrier warranty.

Fig. 3 — Fan Unit Label

Fig. 4 — Airflow Label

2

Table 1 — Unit Weights

45J UNIT WEIGHTS (lb)

SIZE UNIT WT

2 70 74 79 100 89 91
3 70 74 79 100 90 92
4 85 89 94 117 107 110
5 85 89 94 117 109 113
6 100 104 109 135 125 130
7 140 144 109 180 175 183

WITH PNEUMATIC

CONTROLS

WITH DDC OR ANALOG

CONTROLS

WITH ELECTRIC HEATER

WITH HOT WATER

1-Row 2-Row

45M UNIT WEIGHTS (lb)

SIZE UNIT WT

2 114 118 123 144 133 135
3 114 118 123 144 133 135
4 115 119 124 147 134 136
5 122 126 131 154 134 136
6 123 127 132 155 135 137
7 127 131 136 167 139 141

WITH PNEUMATIC

CONTROLS

WITH DDC OR ANALOG

CONTROLS

WITH ELECTRIC HEATER

WITH HOT WATER

1-Row 2-Row

45K UNIT WEIGHTS (lb)

SIZE UNIT WT

2 185 189 194 278 194 197
3 200 204 209 280 209 212
4 200 204 209 232 209 212
5 225 229 234 257 237 242
6 250 254 259 285 262 267
7 260 264 269 300 272 277

WITH PNEUMATIC

CONTROLS

WITH DDC OR ANALOG

CONTROLS

WITH ELECTRIC HEATER

WITH HOT WATER

1-Row 2-Row

45N UNIT WEIGHTS (lb)

SIZE UNIT WT

2 185 189 194 219 197 197
3 200 204 209 230 209 212
4 200 204 209 237 209 212
5 225 229 234 257 237 242
6 250 254 259 284 262 267
7 260 264 269 304 272 277

WITH PNEUMATIC

CONTROLS

WITH DDC OR ANALOG

CONTROLS

WITH ELECTRIC HEATER

WITH HOT WATER

1-Row 2-Row

45Q UNIT WEIGHTS (lb)

SIZE UNIT WT

2 60 64 69 75 70 72
3 70 74 79 85 80 82
4 110 114 119 132 122 124

WITH PNEUMATIC

CONTROLS

WITH DDC OR ANALOG

CONTROLS

WITH ELECTRIC HEATER

WITH HOT WATER

1-Row 2-Row

45R UNIT WEIGHTS (lb)

SIZE UNIT WT

2 80 84 89 95 88 90
4 90 94 99 110 98 100

LEGEND

DDC — Direct Digital Controls

WITH PNEUMATIC

CONTROLS

WITH DDC OR ANALOG

CONTROLS

WITH ELECTRIC HEATER

WITH HOT WATER

1-Row 2-Row

3

CONTROL OPTIONS

The units are offered with a wide variety of factory­mounted controls that regulate the volume of air delivery from
the unit and respond to cooling and heating load requirements
of the conditioned space. All control packages can operate
stand-alone and will fulfill the thermal requirements of a given
control space. These devices are available in both pneumatic
and electronic arrangements. The 3V™ and ComfortID™ con­trol types are communicating controls which can be integrated
into a CCN building system. A number of DDC (direct digital
control) control packages by others are available for consign­ment mounting as indicated.

Control offerings are:

A: Analog Electronic

C: ComfortID™, VAV

P: Pneumatic

V: 3V™, VVT® (45M,N,R units only)

N: None or DDC by others

Each control approach offers a variety of operating func­tions; a control package number identifies combinations of
control functions. 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.

ComfortID™ VAV Controls — Pressure independent

control packages are available with or without heat. These con­trols provide occupied and unoccupied heating and cooling, de­mand controlled ventilation (DCV), and zone humidity control.
They can be networked together via the CCN network to pro­vide integrated system operation of all components, including
the operation of air source equipment. These controls may be
used in a stand-alone terminal, or as part of the Carrier DDC
control system. All control arrangements include a standard
linear inlet flow sensor, control enclosure, SCR (silicone con­trol rectifier) fan speed controller, class II 24-volt power trans­former, and fan contactor. Several types of room sensors may
be ordered, with and without set point adjustment, and with in­tegral CO

CONTROL ARRANGEMENTS — ComfortID control pack­ages must be used in combination with a thermostat. Thermo­stats are not included in the package and are ordered separately.
See Tables 2A and 2B.

Table 2A — ComfortID VAV Control Arrangements

PACKAGE

SSR — Solid-State Relay

Table 2B — ComfortID VAV Control Arrangements

sensors.

2

— 45JC,KC,QC Series Terminals

NO.
4440 No heat (or field supplied baseboard heat)
4442 Cooling with up to 3 stage electric heat
4443 Cooling with On-Off hot water
4444 Cooling with proportional (floating) hot water
4452 Cooling with 1 to 3 stage field-installed electric heat
4454 Cooling with Proportional SSR electric heat

DESCRIPTION

— 45MC,NC,RC Parallel Terminals

ACCESSORY THERMOSTATS:
Thermostat: 33ZCT55SPT: RT (room temperature) sensor,

with override only.
Thermostat: 33ZCT56SPT: RT (room temperature) sensor,

with set point adjust and override.
Thermostat: 33ZCT58SPT: Communicating room tempera-

ture sensor with LCD, set point adjust, fan control, and over­ride.

Inlet Air Temperature Sensor: 33ZCSENPAT (required only if
linkage unavailable)

NOTE: The 33ZCSENSAT supply air temperature sensor is
included with the controls package. Field-installed VVT com­ponents such as thermostats and bypass controllers must still
be ordered separately and shipped to the job site.

3V™ VVT® Controls — Pressure dependent control

packages are available with or without hot water (on-off con­trol), electric heat (up to 2 stages), or SSR (solid-state relay)
electric heat. They are designed to be an integral part of the
Carrier 3V, VVT control system, for parallel flow units only.
All control arrangements include a standard linear inlet flow
sensor, control enclosure, SCR fan speed controller, 24-volt
transformer and fan relay. The 3V, VVT terminals are not
available on series terminal units.

The 3V, VVT packages must be used in conjunction with a
VVT compatible thermostat. Field-installed thermostats are
not included and must be ordered separately. See Table 3.

Table 3 — 3V, VVT Control Arrangements

— 45MV,NV,RV Parallel Terminals

PACKAGE

NO.

8815 Pressure dependent, cooling only

8818

8819

8820

8825

8829

8830

Pressure dependent, cooling with on-off hot
water reheat

Pressure dependent, cooling with 3-stage electric
heat

Pressure dependent, cooling with modulating hot
water reheat

Pressure dependent, cooling with combination
baseboard and ducted reheat

Pressure dependent, cooling with 1 to 3 stage
field-installed electric heat

Pressure dependent, cooling with Proportional
SSR electric heat

DESCRIPTION

Analog Electronic Controls — Pressure independent

control packages are available with or without hot water or
electric heat, automatic or remote night shutdown, and auto­matic night setback. All control arrangements include a
standard linear inlet flow sensor, control enclosure, SCR fan
speed controller, 24-volt transformer, fan relay, and wall ther­mostat to match the control type. See Tables 4A and 4B.

PACKAGE

NO.
4740 No heat (or field supplied baseboard heat)
4742 Cooling with up to 3 stage electric heat
4743 Cooling with On-Off hot water
4744 Cooling with proportional (floating) hot water
4752 Cooling with 1 to 3 stage field-installed electric heat
4754 Cooling with Proportional SSR electric heat

SSR — Solid-State Relay

DESCRIPTION

4

Table 4A — Analog Electronic Control

Arrangements — 45JA,KA,QA Series Terminals

PACKAGE

NO.
2200 Cooling only
2201 Cooling only with automatic night shutdown
2202 Cooling only with remote night shutdown
2203 Cooling only with automatic night setback
2204 Cooling with on/off hot water heat
2205 Cooling with on/off hot water heat and automatic night

2206 Cooling with on/off hot water heat and remote night

2207 Cooling with on/off hot water heat and automatic night

2208 Cooling with proportional hot water heat
2209 Cooling with proportional hot water heat and automatic

2210 Cooling with proportional hot water heat and remote

2211 Cooling with proportional hot water heat and automatic

2212 Cooling with up to 2 stages of electric heat
2213 Cooling with up to 2 stages of electric heat and auto-

2214 Cooling with up to 2 stages of electric heat and remote

2215 Cooling with up to 2 stages of electric heat and auto-

2216 Cooling with up to 2 stages of electric heat, cooling/

2218 Cooling with proportional electric heat

shutdown

shutdown

setback

night shutdown

night shutdown

night setback

matic night shutdown

night shutdown

matic night setback a variety of pressures

heating automatic change over control (morning warm­up) and automatic night setback

DESCRIPTION

Table 4B — Analog Electronic Control

Arrangements — 45MA,NA,RA Parallel Terminals

PACKAGE

NO.
2300 Cooling with sequenced fan
2301 Cooling with sequenced fan and auto. night shutdown
2302 Cooling with sequenced fan and auto. night setback
2303 Cooling with sequenced fan and on/off hot water heat
2304 Cooling with sequenced fan and on/off hot water heat

2305 Cooling with sequenced fan and on/off hot water heat

2306 Cooling with sequenced fan and proportional hot water

2307 Cooling with sequenced fan proportional hot water heat

2308 Cooling with sequenced fan proportional hot water heat

2309 Cooling with sequenced fan and up to 2 stages of elec-

2310 Cooling with sequenced fan up to 2 stages of electric

2311 Cooling with sequenced fan up to 2 stages of electric

2313 Cooling with sequenced fan and proportional electric

and auto. night shutdown

and auto. night setback

heat

and auto. night shutdown

and auto. night setback

tric heat

heat and auto. night shutdown

heat and auto. night setback

heat

DESCRIPTION

Pneumatic Controls — Pressure independent control

packages are available with or without hot water or electric
heat, night shutdown and/or unoccupied heating. All control ar­rangements include a standard linear inlet flow sensor and SCR
fan speed controller. See Tables 5A and 5B.

Single function controller: Provides single function,
i.e., DA-NO.

Multi-function controller: Capable of providing DA-NO,
DA-NC, RA-NC or RA-NO functions.

Table 5A — Pneumatic Control Arrangements —

45JP,KP,QP Series Terminals

PACKAGE

NO.

1300 Single function controller; DA-NO with or without hot

1301 Single function controller; DA-NO with or without hot

1302 Single function controller; DA-NO with or without hot

1303 Single function controller; RA-NC with or without hot

1304 Single function controller; RA-NC with or without hot

1305 Single function controller; RA-NC with or without hot

1306 Multi-function controller; DA-NO with or without hot

1307 Multi-function controller; DA-NO with or without hot

1308 Multi-function controller; DA-NO with or without hot

1309 Multi-function controller; DA-NC with or without hot

1310 Multi-function controller; DA-NC with or without hot

1311 Multi-function controller; DA-NC with or without hot

1312 Multi-function controller; RA-NC with or without hot

1313 Multi-function controller; RA-NC with or without hot

1314 Multi-function controller; RA-NC with or without hot

1315 Multi-function controller; RA-NO with or without hot

1316 Multi-function controller; RA-NO with or without hot

1317 Multi-function controller; RA-NO with or without hot

water or electric heat

water or electric heat and with night shutdown

water or electric heat, with night shutdown and unoc­cupied heating

water or electric heat

water or electric heat and with night shutdown

water or electric heat, with night shutdown and unoc­cupied heating

water or electric heat

water or electric heat and with night shutdown

water or electric heat, with night shutdown and unoc­cupied heating

water or electric heat

water or electric heat and with night shutdown

water or electric heat, with night shutdown and unoc­cupied heating

water or electric heat

water or electric heat and with night shutdown

water or electric heat, with night shutdown and unoc­cupied heating

water or electric heat

water or electric heat and with night shutdown

water or electric heat, with night shutdown and unoc­cupied heating

DESCRIPTION

Table 5B — Pneumatic Control Arrangements —

45MP,NP,RP Parallel Terminals

PACKAGE

NO.
1400 1 function DA-NO with or without optional heat
1401 1 function RA-NC with or without optional heat
1402 4 function DA-NO with or without optional heat
1403 4 function RA-NO with or without optional heat
1404 4 function DA-NC with or without optional heat
1405 4 function RA-NC with or without optional heat

LEGEND

DA — Direct Acting Thermostat
RA — Reverse Acting Thermostat
NO — Normally Open Damper Position
NC — Normally Closed Damper Position

DESCRIPTION

No Controls or Direct Digital Controls (By Oth­ers) — Control sequences are available for factory installa-

tion of numerous field-supplied controls from various manu­facturers including: Andover, Automated Logic, Invensys (Sie­be), Siemans (Landis), Johnson, and others. All packages in­clude a standard liner inlet flow sensor, control enclosure, SCR
fan speed controller, 24-v transformer, and fan relay.

Contact Carrier for information on mounting field-supplied

controls.

5

NO CONTROL UNITS — Control sequences are also avail­able to provide a control box on units supplied with no factory­installed controls. These arrangements include a standard
linear inlet flow sensor, control enclosure, SCR fan speed con­trol, 24-v transformer, and fan relay. See Table 6.

Table 6 — No Control Arrangements —

45JN,MN,KN,NN,QN,RN Terminals

PACKAGE

NO.

D000 Field supplied and mounted controls by others. (For

D001 Field supplied and mounted controls by others. (For

units without electric heat, includes Class II for 24-volt
power transformer.)

units with electric heat that already include a trans­former.)

DESCRIPTION

INSTALLATION

Step 1 — Install Fan-Powered Box

SELECT LOCATION

1. Units should be installed so that they do not come in con­tact with obstacles such as rigid conduit, sprinkler piping,
Greenfield flexible metal covering, or rigid pneumatic
tubing; such contact can transmit vibration to the building
structure, causing objectionable low frequency noise.

2. Units should never be installed tight against concrete
slabs or columns, as vibration transmission is amplified in
this condition.

3. Fan powered terminals require sufficient clearance for
servicing the blower/motor assembly from the bottom of
the unit, low voltage controls from the side and line volt­age motor controls or electric heat (if equipped) from the
rear (discharge end) of the unit.

Bottom access panel removal requires a minimum of 3 in.
minimum clearance, plus substantial horizontal clearance
to slide the access panel out of the way for service. Actual
horizontal dimensions will vary due to varying access
panels for different sized units. See your particular unit’s
submittal drawings for more detail.

NOTE: Be certain appropriate accommodations for panel
removal of most unit casings are large enough to allow
adequate internal service room once the panels are
removed.

A clearance of 18 in. is recommended for control enclo­sure access. Unit control enclosure will vary depending
on which control package is used. Control enclosure loca­tion is specified on unit submittals. Low voltage enclo­sure covers are removable, not hinged.

A clearance of 36 in. is recommended for line voltage
motor controls and electric heat control access. High­voltage motor controls or electric heat control access is
supplied with hinged access doors for units with fused
disconnect. Specific location is indicated on the unit
submittal.

NOTE: These recommendations do not supersede NEC
(National Electrical Code) or local codes that may be
applicable, which are the responsibility of the installing
contractor.

4. Whenever possible, fan-powered boxes should be
installed over halls or passageways (rather than over
occupied spaces) in order to limit the sound reaching
occupants.

POSITION UNIT

1. When moving boxes, use appropriate material handling
equipment and avoid contact with shaft extensions, con­trols, wiring, piping, heaters, and control boxes.

2. Raise unit to position using safe mechanical equipment
and support until hanging means are attached and box is
level.

INSTALL UNIT

1. Install field-supplied eye bolts, strap hangers or bolt rod
supports as desired. Figure 5 illustrates possible unit sus­pension methods. A typical installation is shown in Fig. 6.

2. Care should be taken to use hanging materials of suffi­cient stiffness and strength, rigidly attached to the unit.
Straps should not be located on coil flanges, electric heat
sections, or control boxes. When using trapeze supports,
avoid areas where access is required to side mounted con­trols, or side or bottom access doors. For best installation
with trapeze supports, provide elastomeric material be­tween unit and supports.

3. Hangers should be securely attached to bar joist or
mounting anchors properly secured to building structure
with lugs or poured-in-place hangers. Percussion nails are
not considered adequate anchors.

Step 2 — Make Duct Connections

1. Check that the pressure pick-up in primary air collar is
located properly and that air supply duct connections are
airtight. Install supply ductwork on unit inlet collar, fol­lowing all accepted medium-pressure duct installation
procedures. Seal joints against leakage.

NOTE: For maximum efficiency in controlling radiated
noise in critical applications, inlet ducts should be fabri­cated of 24-gage minimum sheet metal in place of flex
connections. Flex duct is extremely transparent to radiat­ed sound; consequently high inlet statics (Ps) or sharp
bends with excessive pressure drop can cause a radiated
noise problem in the space. If flex duct is used, it should
be limited to the connection between the distribution duct
and the boot diffuser.

2. Install the discharge duct, being careful not to reduce the
face area of any electric heat section until several diame­ters away from the unit. It is strongly recommended that
lined discharge duct be used downstream of the unit. In­sulate duct as required.

3. Fan boxes should not be attached to octopus sections im­mediately downstream of the unit.

4. Install optional return-air filters before operating the unit.

5. Where construction filters were supplied with the box,
leave filters in place until installation is complete and
building is cleaned for occupancy.

Step 3 — Connect Power Wiring — See Fig. 7.

1. All power wiring must comply with local codes and with
the NEC (National Electrical Code) ANSI/NFPA (Ameri­can National Standards Institute/National Fire Protection
Association) 70-1981. Disconnect switches are optional
equipment. Electrical, control and piping diagrams are
shown on the exterior labeling or on a diagram inside the
control and high-voltage enclosure covers, unless other­wise specified in the order write-up. All units are wired
for a single point electrical connection to the fan and elec­tric heater (if equipped). Electric heaters provided by Car­rier are balanced by kW per stage. The installing electri­cian should rotate incoming electric service by phase to
help balance overall building load.

6

OPTIONAL
ACCESSORY
HANGER

FIELD-SUPPLIED
HANGER
BRACKET

FIELD-SUPPLIED

HANGING STRAPS

Fig. 5 — Typical Unit Suspension Methods (45K Shown)

DO NOT suspend unit

by trapeze hangers
that interfere with the
unit access panel.

Fig. 6 — Typical Perimeter Installation — Constant Volume Fan-Powered Box

7

LEGEND

AFS — Airflow Switch
CAP — Capacitor
SCR — Silicone Control Rectifier

Fig. 7 — Typical Power Connections for Fan Powered Units with 3-Stage Electric Heat

2. All field wiring must be provided with a safety discon­nect per NEC 424-19, 20, and 21.

3. Disconnect all incoming power before wiring or servicing
unit. All disconnect switches on the terminal (if
equipped) should be in the OFF position while making
power connections.

4. Units with electric heat should use copper wires rated at
least 125% of rating plate amperage. Refer to the unit’s
rating label and minimum supply circuit amps.

5. Observe wiring diagram and instructions attached to the
unit. The 480-v, 3-phase units require a Wye power
source with a fourth (neutral) wire in addition to the full
sized ground wire. All units must be grounded as required
by NEC 424-14 and 250.

Step 4 — Set Up System and Calibrate

GENERAL — The parallel fan powered terminals (45K and
45N) are designed to provide varying quantities of cold
primary air to a space in response to a thermostat demand for
cooling. For a heating demand, the fan will operate to supply
ceiling plenum air to the space. For units equipped with a heat­ing coil, the heater will operate as required to meet a heating
demand.

The series fan powered terminals (45J and 45M) are de­signed to provide a constant airflow to the space. The air
supplied to the space is a mixture of primary air and ceiling
plenum air. The fan speed is adjusted to provide the required
airflow to the space. In response to a cooling demand from a
thermostat, the damper will increase the amount of cold prima­ry air while reducing the amount of ceiling plenum air to
decrease the temperature of the air being delivered to the space.

Most terminal control packages provide pressure compen­sation to allow pressure independent operation of the primary
air damper, regardless of changes to the available static pres­sure in the supply ductwork. To balance the unit it is necessary
to set both the minimum and maximum airflow set points of
the controller. The many types of control options available each
have specific procedures required for balancing. Refer to the
submittal information for these requirements.

SET POINTS — Maximum and minimum airflow set points
are normally specified for the job and specific for each unit on
the job. Default set point values are provided by the factory and
can be reset to the specific requirements in the field. The fan
speed must be field adjusted after all discharge ductwork and
diffusers have been installed.

Field Adjustment of the Maximum and Minimum Airflow
Set Points — Each fan powered terminals unit is equipped
with a flow probe installed in the primary air inlet which mea­sures a differential pressure. The relationship between the
airflow probe pressure and the corresponding airflow is shown
in the Flow Probe Graph. See Fig. 8. This chart is attached to
each unit.

SYSTEM CALIBRATION OF THE LINEAR AVERAGING
FLOW PROBE — To achieve efficient pressure independent
operation, the velocity sensor and linear averaging flow probe
must be calibrated to the controller. This will ensure that air­flow 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 different velocity pressure
of 1.0 in. wg, by the standard pitot tube coefficient of 4005.
This ratio is the same for all sizes, if the standard averaging
probe is used.

8

10000

8000

6000

4000

2000

1000

800

600

400

CFM

200

100

80

60

40

20

10

0.01 .03

INLET SIZE 16

INLET SIZE 14

INLET SIZE 12

INLET SIZE 10

INLET SIZE 08

INLET SIZE 06

.05

FLOW PROBE PRESSURE DIFFERENTIAL IN. WG

0.1

0.3 0.5

Fig. 8 — Linear Probe CFM vs Signal Chart

1

3709

2840

2086

1449

927

CFM @ ONE INCH SIGNAL

522

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.

Carrier inlet areas are shown in Table 7. The design air
volume is shown. It can be determined from Table 7 that the
average design air velocity for units is equal to 0.2656 fpm at

1.0-in. wg.

Table 7 — Inlet Areas — 45J,K,M,N,Q,R

INLET

DIAMETER (in.)

Cfm at

1 in. wg

Inlet Area

(sq ft)

NOTE: For ComfortID™ terminals, all flow sizes are normalized
using a single probe multiplier (PMF) for all sizes equal to 2.273.

6.0 8.0 10.0 12.0 14.0 16.0

522 927 1449 2086 2840 3709

0.196 0.349 0.545 0.785 1.069 1.396

START-UP

General —

must be operating in accordance with the specifications for air
capacity, static pressure, and temperature. Record data on a unit
performance sheet (Fig. 9). The following items must be
checked:

1. All fans must be running at calculated and specified rpm.

2. Permanent or temporary filters must be clean and in­stalled where required.

3. All central station dampers must be adjusted and operat­ing properly.

4. All thermostats must be calibrated and at the desired
settings.

Before balancing the system, the air handlers

5. All ductwork must be tight.

6. All dirt or loose lining must be removed from inside
ductwork.

7. Pumps and sprays, when used, must be in operation.

8. Connections to the coil, when used, must be checked.

9. Water control valve, if used, must be checked.

IMPORTANT: Before proceeding with start-up, be cer­tain that voltage, frequency, and phase correspond to
unit specifications. Unless noted, all fan motors are
60 Hz, 115, 208/230, or 277 v, single-phase ac.

NOTE: All 45 Series terminal units are shipped with cardboard
packaging restraints placed inside both sides of the blower
housing internal to the blower/motor. These restraints are pro­vided to prevent damage to the motor during shipment. The
restraints MUST BE REMOVED prior to operation.

Remove the bottom access panel to remove the cardboard

packing material.

Carrier Corporation will not accept responsibility for any

additional costs for removal of this packaging material.

Initial Start-Up Procedures

NOTE: The following steps MUST be followed in order to
properly operate and service this unit.

1. Disconnect all electrical power to the unit. Failure to dis­connect the power to the fan box prior to checking and/or
servicing the fan box could result in a serious injury.

2. Verify that the fan box is installed level, and that adequate
mounting support has been provided.

3. Remove motor access panel from the bottom of the fan
box, and also remove the control panel cover.

9

4. Test the fan motor setscrew. The setscrew should fit
tightly, but it may have come loose during shipment or
installation.

5. Rotate the blower by hand to ensure proper clearance be­tween the blower and the blower housing.

6. Check the fan box for loose fiberglass insulation, espe­cially on the electric heater elements or the hot water coils
(if these accessories are installed).

7. Check the control enclosure and remove any debris.

8. Check the induction inlet filter (if provided) for obstruc­tions, and verify the filter is securely in place.

9. Verify the main power supply to the connection to the fan
box for proper voltage. If the fan box is installed with
electric heat, the electric heat voltage may exceed the
blower motor voltage requirement. Excessive voltage to
the fan box may seriously damage it. Verify that the DDC
(if equipped) are receiving 24-v ac, –15%, +20%.

10. Identify the control system supplied.

11. Check all control connections (and/or electric) for proper
installation.

12. Connect electrical power.

Balancing Carrier Fan Terminals — Carrier fan

terminal units contain primary air dampers which, under the
control of a volume controller, regulate the amount of cold air
distributed to the space.

45J,K,Q SERIES FLOW UNITS — The 45J,K,Q series flow
terminals direct all primary air through the unit fan. The termi­nal is designed to operate with the fan supplying airflow equal
to or greater than the airflow supplied by the VAV damper. To
balance the unit, therefore, it is necessary to first set the fan
flow, and then the VAV damper (primary) flow.

Each control option has specific procedures required for
balancing the unit, but some steps are common to all 45J,K,Q
units. The fan box adjustments described below must be made
in conjunction with the adjustments described in the Speed
Controller section.

The VAV damper airflow may be set at the factory, but the
fan airflow must be set in the field as described below.

Setting Fan Airflow
NOTE: If the unit has electric heat or hot water heat, tempo-

rarily disable these functions before balancing the fan.

If unit has optional electric heat disconnect downstream of
fan motor connections to power, open disconnect.

If unit does not have optional electric heat disconnect, re­move one electric heat power line connection. Be sure to
insulate loose line from ground wire or other wires.

1. Set the controller to provide heating airflow demand only.
Typically, this is accomplished by setting the thermostat
to the highest possible temperature setting.

2. Determine that the VAV valve is fully closed and that the
fan is rotating in the proper direction. (If the VAV damper
is open when the fan is started and there is primary air in
the system, the fan may start and run backward.)

3. Using a flow hood or duct traverse, determine the deliv­ered fan airflow (cfm).

NOTE: Both flow hood and duct traverse are subject to
measurement errors. Be sure that all applicable measure­ment precautions are taken.

4. Compare the actual cfm in heating mode to the designed
airflow. If there is a minimum setting for the VAV damper
in heating mode (as recommended by ASHRAE [Ameri­can Society of Heating, Refrigeration, and Air

Conditioning Engineers] Standard 62), this quantity is in­cluded in the total measured heating airflow to determine
if the desired induction airflow level has been met.

5. Adjust the fan SCR at unit control box to achieve the
desired airflow rate. Refer to the performance data tables
(Tables 8-10) to ensure airflow through electric heaters
meets the requirements before operating the heater.

Setting of VAV (Primary) Airflow
Adjustment of Set Points — Each 45J, 45K, and 45Q supplied

with controls is equipped with a pneumatic or electronic vol­ume controller which regulates the quantity of cold primary air
entering the terminal and the conditioned space. If required air­flow levels are specified with the job order, the minimum and
maximum cfm levels will be set at the factory where applica­ble. If minimum and maximum levels are not specified, a
default value of 0 is used for minimum setting at the factory.
Other settings of minimum and maximum primary airflow
must be set in the field. Airflow (cfm) ranges for the primary
air damper are shown in Tables 8-10. The minimum primary
airflow (other than zero) is the minimum flow rate controllable
by the unit volume controller. The primary air damper can be
set at zero for shutoff or at the minimum cfm listed.

Field Adjustment of Minimum and Maximum Airflow Set
Points — Each 45J, 45K, and 45Q unit is equipped with a lin-

ear averaging flow probe which provides an amplified differ­ential pressure that is proportional to the unit airflow. Output
from this probe is used to provide a flow signal to both pneu­matic and electronic controls. Unit airflow (cfm) can be read
directly from the flow probe on the unit (refer to Fig. 8).

1. With the unit airflow from the fan set, turn on primary
(VAV) air supply.

2. To set cfm in the field, connect a gage to the flow probe at
the provided ‘T’ taps, and check the differential pressure.
(Alternately, the total flow may be measured, and the pre­viously determined fan induction flow rate may be sub­tracted from the total flow to determine VAV flow.
However, for low primary settings, this may not be as
accurate as the flow tap method.)

3. If a minimum VAV flow is required in heating mode, ad­just the volume until the differential pressure corresponds
to the cfm required.

4. Set the controller to provide maximum cooling demand.
This is typically accomplished by first setting the thermo­stat to the lowest possible temperature setting.

a. In most series fan boxes, the primary airflow rate is

equal to the fan induction flow; in these cases,
adjust the volume controller until a balance is
achieved between fan induced airflow and primary
airflow. When a balance exists, a strip of paper
hung at the induction port should hang straight
down, and neither be blown in or out of the unit.

b. If the VAV airflow desired is less than the fan

induction flow, adjust the volume controller until
the differential pressure (measured through the
flow probe as described above) corresponds to the
cfm required. Verify that induction exists through
the inlet ports, using the paper strips as described
above. When induction exists, the paper strip
should be pulled into the unit.

5. Return all reheat options to normal connections.

6. Cap the ‘T’ taps.

7. Reset the thermostat to a normal setting.
NOTE: It is normal for the total airflow to the room to in-

crease slightly in full cooling mode.

10

AIR TERMINAL PERFORMANCE SHEET

JOB NAME ________________________________________

JOB LOCATION ____________________________________

CUSTOMER ________________________________________

ENGINEER ________________________________________

BUILDING LOCATION/FLOOR ________________________

BUS NUMBER ______________________________________

CONTROL SET POINTS

Tag

Number

Zone

Address #

Box
Size

(in./cfm)

Cooling

(Cfm)

min max min max Type Btu min max min max mult.

Fan
cfm

Heating

(Cfm)

Heat kW Occupied Unoccupied

Calibration

Gain

Fig. 9 — Air Terminal Performance Sheet

11

Table 8 — 45J Series Fan Powered Terminal Unit Performance

UNIT
SIZE

45J

INLET

SIZE

(in.)

2 6

3

4

5

6

6
8 990 300 920 170 or 0 93 or 0

8
10 1440 550 1430 250 or 0 145 or 0
10
12 2100 1100 2060 360 or 0 210 or 0
12
14 2530 1200 2530 500 or 0 285 or 0

7* 16 (2)

MOTOR

HP

1

/

10

1

/

4

1

/

4

1

/

2

3

/

4

3

/

120V 208/240V 277V Max Min Max Min

1.8 1.0 0.7 560 100 515 90 or 0 52 or 0

3.6 2.0 1.5

5.0 2.8 2.1

8.3 4.6 3.5

9.5 5.8 4.4

N/A 13.2 9.9 3900 2100 3660 650 or 0 370 or 0

4

MOTOR

AMPS

LEGEND

ASHRAE— American Society of Heating, Refrigeration and Air

DDC — Direct Digital Controls

Conditioning Engineers

*45J unit size 7 is not available with 120 v motor option.

NOTES:

1. 45J maximum primary airflow (cfm) is set by the maximum
induced airflow, which may vary as a function of downstream
pressure. Maximum airflow shown is based on the maximum
induced airflow (fan airflow) or 1.00 in. wg velocity pressure at
inlet probe, whichever is less.

2. Minimum recommended primary airflow (cfm) is based on

0.03 in. wg differential pressure of the linear inlet flow sensor,
or 0 airflow. 0.03 in. wg is equal to 15% to 20% of the nominal

FAN AIRFLOW (cfm) PRIMARY AIRFLOW (cfm)

Min

ComfortID

990 300 515 90 or 0 52 or 0

1440 550 920 170 or 0 93 or 0

2100 1100 1430 250 or 0 145 or 0

2530 1200 2060 360 or 0 210 or 0

flow rating of the terminal. Less than 15% to 20% may result in
greater than +5% control of box flow.

3. 45J maximum fan airflow is based on 0.10 in. wg downstream
static pressure.

4. 45J minimum fan airflow (cfm) is based on maximum external
(downstream) static pressure 0.60 in. wg.

5. Minimum primary airflow (cfm) listed is for all controls except
ComfortID controls which is shown separately with lower avail­able minimum cfm. Some DDC controls supplied by others may
have different limitations.

6. Do not select discharge temperature exceeding 120 F. In addi­tion, ASHRAE recommends a maximum discharge tempera­ture of 90 F to avoid room air stratification when heating from
the ceiling (2001 Fundamentals, Chapter 32).

Table 9A — 45K Quiet Series Fan Powered Terminal Unit Performance (PSC Motor)

UNIT

SIZE

45K

2

3

4

5

6

7

ARI — Air Conditioning and Refrigeration Institute
DDC — Direct Digital Controls
FLA — Full Load Amps
PSC — Permanent Split Capacitor Motor
Ps — Static Pressure

INLET

SIZE (in.)

10 1150 250 or 0 145 or 0

10 1400 250 or 0 145 or 0
12 1425 360 or 0 210 or 0
10

14 1900 500 or 0 285 or 0
10
12 2100 360 or 0 210 or 0
14 2500 500 or 0 285 or 0
16 2600 650 or 0 370 or 0
10
12 2100 360 or 0 210 or 0
14 2500 500 or 0 285 or 0
16 3000 650 or 0 370 or 0

LEGEND *Max based on 0.1 in. wg downstream Ps for PSC motors. See Catalog for

PSC MOTOR

HP

6
8 530 170 or 0 93 or 0
6

6
8 900 170 or 0 93 or 0

1

/

10

1

/

4

1

/

4

1

/

2

3

/

4

112.87.17.15.3

120 V

FLA

1.4 0.8 0.8 0.6

4.3 2.4 2.4 1.8

4.3 2.4 2.4 1.8

8.3 4.4 4.4 3.5

9.5 5.0 5.0 4.4

MOTOR AMPS PRIMARY AIRFLOW FAN AIRFLOW*

208 V

FLA

240 V

FLA

277 V

FLA

complete fan curves. Min based on 0.6 in. wg downstream Ps for PSC
motors.

†For all controls except ComfortID controls. Some DDC controls supplied by

others may have differing limitations.

NOTES:

1. Data is based on tests conducted in accordance with ARI Standard 880-

98.

2. Minimum airflow for cooling or cooling with hot water heat is the mini­mum flow rate controllable by the unit volume controller; shutoff or zero
is also acceptable.

Max with

PSC

500 90 or 0 52 or 0

500 90 or 0 52 or 0

500 90 or 0 52 or 0

1400 250 or 0 145 or 0

1400 250 or 0 145 or 0

1400 250 or 0 145 or 0

Min†

ComfortID

Min

Max
PSC

530 50

1150 1858 900 170 or 0 93 or 0

1425 500

1900 80012 1900 360 or 0 210 or 0

2600 1200

3000 1250

Min

PSC

12

Table 9B — 45K Quiet Series Fan Powered Terminal Unit Performance (ECM Motor)

UNIT
SIZE

45K

3

6

7

ARI — Air Conditioning and Refrigeration Institute
ECM — Electronically Commutated Motor
FLA — Full Load Amps

*Special order.

†This value is based on signal of 0.03 in. wg differential pressure of the linear

averaging probe.

INLET

SIZE (in.)

LEGEND

ECM MOTOR

HP

6

8 900 170 or 0 93 or 0
10 1400 250 or 0 145 or 0
12 1400 360 or 0 209 or 0
10
12 2000 360 or 0 209 or 0
14 2000 500 or 0 284 or 0
16 2000 650 or 0 370 or 0
10 1400 250 or 0 145 or 0
12 2100 360 or 0 209 or 0
14 2500 500 or 0 284 or 0
16 2500 650 or 0 370 or 0

1

/

2

1 12.8 9.4 6.9

120 V FLA* 240 V FLA* 277 V FLA Max with ECM Min†

ECM MOTOR AMPS PRIMARY AIRFLOW FAN AIRFLOW

7.7 5.0 4.1

Table 10 — 45Q Low Profile Series Fan Powered Terminal Unit Performance

UNIT

SIZE

45Q

2

3
4

LEGEND

DDC — Direct Digital Controls
Ps — Static Pressure

NOTES:

1. 45Q maximum primary airflow (cfm) is set by the maximum induced
airflow, which may vary as a function of downstream pressure.
Maximum airflow shown is based on the maximum induced airflow
(fan airflow) or 1.00 in. wg velocity pressure at inlet probe, which­ever is less.

2. Minimum recommended primary airflow (cfm) is based on 0.03 in.
wg differential pressure of the linear inlet flow sensor, or 0 airflow.

0.03 in. wg is equal to 15% to 20% of the nominal flow rating of the
terminal. Less than 15% to 20% may result in greater than +5%
control of box flow.

INLET

SIZE (in.)

6
8

8

8 x 14 (2) 1/

MOTOR

HP

1

/

6

1

/

6

1

/

4

6

MOTOR AMPS FAN AIRFLOW (cfm) PRIMARY AIRFLOW (cfm)

120V 208/230V 277V Max Min Max Min

2.8 1.5 1.1 840 310 522 90 52 0.04

2.8 1.5 1.1 840 310 840 160 93 0.06

4.1 2.2 1.6 1090 520 927 160 93 0.07

6.9 3.7 2.7 1650 800 1650 358 207 0.10

Min

500 90 or 0 52 or 0

1400 250 or 0 145 or 0

NOTES:

1. Data is based on tests conducted in accordance with ARI Standard 880-

98.

2. Minimum airflow for cooling or cooling with hot water heat is the minimum
flow rate controllable by the unit volume controller; shutoff or zero is also
acceptable.

3. 45Q maximum fan airflow is based on 0.10 in. wg downstream
static pressure.

4. 45Q minimum fan airflow (cfm) is based on maximum external
(downstream) static pressure 0.60 in. wg.

5. Minimum primary airflow (cfm) listed is for all controls except Com­fortID control which is shown separately with lower available mini­mum CFMs. Some DDC controls supplied by others may have
different limitations.

6. Do not select discharge temperature exceeding 120 F. In addition,
ASHRAE (American Society of Heating, Refrigeration, and Air Con­ditioning Engineers) recommends a maximum discharge tempera­ture of 90 F to avoid room air stratification when heating from the
ceiling (2001 Fundamentals, Chapter 32).

ComfortID

Max ECM Min ECM

1030 250

2000 500

2500 600

Min

ComfortID

MINIMUM

Ps. (in. wg)

BALANCING 45M,N,R PARALLEL FLOW UNITS — A
parallel fan terminal is designed to operate with the fan supply­ing air equal to 40 to 60% of the VAV damper maximum set­ting. Adjustments to the parallel units fan should be made with
the primary air closed off. Refer to unit capacity tables to
ensure airflow through the electric heater meets the minimum
requirements before operating heater.

Each control option has specific procedures required for
balancing the unit, but some steps are common to all parallel
fan units, as described below.

To balance parallel fan unit:
Setting Fan Airflow
NOTE: If the unit has electric heat or hot water heat, tempo-

rarily disable these functions before balancing the fan.

If unit has optional electric heat disconnect downstream of
fan motor connections to power, open disconnect.

If unit does not have optional electric heat disconnect, re­move one electric heat power line connection. Be sure to insu­late loose line from ground wire or other wires.

1. Set the controller to provide heating airflow demand only.
Typically, this is accomplished by setting the thermostat
to the highest possible temperature setting.

2. Determine that the VAV damper is fully closed. This may
require a temporary override of the VAV controller. Do
not adjust minimum and maximum cfm set points at this
time.

3. Using a flow hood or duct traverse, determine the deliv­ered fan airflow (cfm).

NOTE: Both flow hood and duct traverse are subject to
measurement errors. Be sure that all applicable measure­ment precautions are taken.

4. Compare the required design cfm in heating mode to the
actual delivered airflow. If there is a minimum setting for
the VAV damper in heating mode (as recommended by
ASHRAE [American Society of Heating, Refrigeration,
and Air Conditioning Engineers] Standard 62), this quan­tity is included in the total measured airflow.

5. Adjust the fan SCR at unit control box to achieve the de­sired airflow rate.

Setting of VAV (Primary) Airflow
Adjustment of Set Points — Each parallel fan unit is equipped

with a pneumatic or electronic volume controller which regu­lates the quantity of cold primary air entering the terminal and
the conditioned space. If required airflow levels are specified

13

with the job order, the minimum and maximum cfm levels will
be set at the factory. If minimum and maximum levels are not
specified, a default value is used. Other settings of minimum
and maximum primary airflow must be set in the field. Airflow
(cfm) ranges for the primary air damper are shown in
Tables 11-13 for 45M,N,R units. The minimum primary air­flow (other than zero) is the minimum flow rate controllable by
the unit volume controller. The primary air damper can be set
at zero for shutoff or at the minimum cfm listed.

Field Adjustment of Minimum and Maximum Airflow Set
Points — Each parallel fan unit is equipped with a linear aver-

aging flow probe which provides an amplified differential
pressure that is proportional to the unit airflow. Output from
this probe is used to provide a flow signal to both pneumatic
and electronic controls. Unit airflow (cfm) can be read directly
from the flow probe on the unit.

1. After the unit airflow from the fan has been set, turn on
primary (VAV) air supply and turn off the fan.

2. To set cfm in the field, connect a gage to the flow probe
and check the differential pressure.

3. If a minimum VAV flow is required in heating mode, ad­just the volume controller until the differential pressure
corresponds to the cfm required.

Table 11 — 45M Parallel Fan Powered Terminal Unit Performance

4. Some control sequences allow the fan to start before the
VAV damper reaches minimum setting, for an overlap­ping of fan and VAV flow. For these sequences, after con­troller min airflow has been adjusted, the total airflow
with both fan and primary airflow should be checked. For
sequences that call for the fan to start as the first stage
of heat, the cooling minimum cfm can be verified at the
diffuser.

Setting the minimum control point will typically require
careful adjustment of the thermostat to create a minimum
cooling demand signal.

5. a. Set the controller to provide maximum cooling de-

mand. This is typically accomplished by setting the
thermostat to the lowest possible temperature set­ting. For most control sequences, this will cause
the fan to shut off.

b. Adjust the volume controller until the differential

pressure (measured through the flow probe as
described above) corresponds to the cfm required.

6. Return all reheat options to normal connections.

7. Cap the ends of the inlet flow sensors.

8. Reset the thermostat to a normal setting.

INLET

UNIT

SIZE

2

3

4

5

6

7 16

LEGEND

ASHRAE — American Society of Heating, Refrigeration and Air

DDC — Direct Digital Controls
EH — Electric Heat
HW — Hot Water Heat

NOTES:

1. 45M maximum primary airflow (cfm) is based on 1.00 in. wg
velocity pressure signal (VP), per inlet size, using a standard
linear averaging sensor.

2. Minimum recommended primary airflow (cfm) is based on

0.03 in. wg differential pressure of the linear inlet flow sensor,
or 0 airflow. 0.03 in. wg is equal to 15% to 20% of the nominal

MOTOR

SIZE

(in.)

6
8 400 200 920 170 or 0 93 or 0 .33 .49 .64

8
10 600 300 1430 250 or 0 145 or 0 .35 .74 .94
10
12 1050 480 2060 360 or 0 210 or 0 .36 .71 .88
12
14 1500 860 2800 500 or 0 285 or 0 .34 .77 1.08
14
16 1800 930 3660 650 or 0 370 or 0 .35 .94 1.36

HP

120V 208/240V 277V Max Min Max Min

1

/

10

1

/

10

1

/

4

1

/

2

1

/

2

3

/

4

Conditioning Engineers

MOTOR

AMPS

1.6 0.9 0.7

2.0 1.2 0.9

3.2 1.9 1.4

7.3 4.1 3.1

10.1 5.1 4.2

9.5 5.8 4.4 2200 1140 3660 650 or 0 370 or 0 .35 .67 .89

FAN AIRFLOW

(cfm)

400 50 515 90 or 0 52 or 0 .32 .37 .42

600 150 920 170 or 0 93 or 0 .33 .48 .56

1050 250 1430 250 or 0 145 or 0 .35 .52 .60

1500 860 2060 360 or 0 210 or 0 .36 .60 .77

1800 930 2800 500 or 0 285 or 0 .34 .68 .92

PRIMARY AIRFLOW

(cfm)

Min

ComfortID

flow rating of the terminal. Less than 15% to 20% may result in
greater than +5% control of box flow.

3. 45M maximum fan airflow (cfm) is based on 0.25 in. wg exter­nal (downstream) static pressure.

4. 45M minimum fan airflow (cfm) is based on maximum external
(downstream) static pressure 0.60 in. wg.

5. Minimum primary airflow (cfm) listed is for all controls except
ComfortID controls which is shown separately with lower avail­able minimum cfm. Some DDC controls supplied by others may
have different limitations.

6. Do not select discharge temperature exceeding 120 F. In addi­tion, ASHRAE recommends a maximum discharge tempera­ture of 90 F to avoid room air stratification when heating from
the ceiling (2001 Fundamentals, Chapter 32).

No or EH 1 row HW 2 row HW

MINIMUM

OPERATING

PRESSURE

(in. wg)

14

Table 12A — 45N Quiet Parallel Fan Powered Terminal Unit Performance (PSC Motor)

UNIT

SIZE

DDC — Direct Digital Controls
EH — Electric Heat
HW — Hot Water
Ps — Static Pressure
PSC — Permanent Split Capacitor Motor

INLET

SIZE (in.)

2

3

4

5

6

7

LEGEND *Max based on 0.25 in. wg downstream Ps for PSC motors. See Catalog for

MOTOR

Hp

6
8 920 160 or 0 93 or 0 0.33 0.42 0.50
6
8 920 160 or 0 93 or 0 0.33 0.41 0.44

10 1430 250 or 0 145 or 0 0.32 0.52 0.58

6

8 920 160 or 0 93 or 0 0.33 0.41 0.43
10 1430 250 or 0 145 or 0 0.32 0.51 0.58
12 2060 360 or 0 210 or 0 0.34 0.77 0.91
10
12 2060 360 or 0 210 or 0 0.34 0.48 0.91
14 2800 480 or 0 285 or 0 0.28 0.48 1.08
10
12 2060 360 or 0 210 or 0 0.34 0.49 0.58
14 2800 480 or 0 285 or 0 0.28 0.49 0.61
16 3660 630 or 0 370 or 0 0.28 0.63 0.85
10
12 2060 360 or 0 210 or 0 0.34 0.48 0.58
14 2800 480 or 0 285 or 0 0.28 0.48 0.61
16 3660 630 or 0 370 or 0 0.28 0.62 0.85

1

/

4

1

/

4

1

/

4

1

/

2

1

/

2

3

/

4

MOTOR AMPS FAN AIRFLOW* PRIMARY AIRFLOW MINIMUM PRESSURES, Ps in. wg

120 V 208/240 V 277 V Max Min Max Min†

2.6 1.5 1.1 500 50

3.1 1.7 1.3 800 50

3.4 1.9 1.4 900 50

7.3 4.1 3.1 1700 375

7.3 4.1 3.1 1800 400

9.5 5.8 4.4 2000 625

Min

515 90 or 0 52 or 0 0.31 0.34 0.36

515 90 or 0 52 or 0 0.31 0.34 0.35

515 90 or 0 52 or 0 0.31 0.34 0.34

1430 250 or 0 145 or 0 0.32 0.39 0.58

1430 250 or 0 145 or 0 0.32 0.39 0.43

1430 250 or 0 145 or 0 0.32 0.39 0.43

complete fan curves. Min based on 0.6 in. wg downstream Ps for PSC
motors.

†For all controls except ComfortID controls. Some DDC controls supplied by

others may have differing limitations.

NOTE: Data is based on tests conducted in accordance with ARI (Air Condi­tioning and Refrigeration Institute) Standard 880-98.

ComfortID

No or EH 1 Row HW 2 Row HW

Table 12B — 45N Quiet Parallel Fan Powered Terminal Unit Performance (ECM Motor)

UNIT
SIZE

4

7

LEGEND

DDC — Direct Digital Controls
ECM — Electronically Commutated Motor
FLA — Full Load Amps

*Special order.

INLET

SIZE (in.)

6

8 900 170 or 0 93 or 0
10 1400 250 or 0 145 or 0
12 2100 360 or 0 210 or 0
10
12 2100 360 or 0 210 or 0
14 2500 500 or 0 285 or 0
16 3300 650 or 0 370 or 0

MOTOR

Hp

1

/

2

1 12.8 9.4 6.9

120 V FLA* 240 V FLA* 277 V FLA Max Min†

ECM MOTOR AMPS PRIMRY AIRFLOW ECM FAN AIRFLOW

7.7 5.0 4.1

Table 13 — 45R Low Profile Parallel Fan Powered Terminal Unit Performance

UNIT
SIZE

45R

INLET

SIZE

2

8 x 14

4

(in.)

MOTOR

HP

6
8

1

/

6

1

/

6

1

/

4

LEGEND

ASHRAE— American Society of Heating, Refrigeration and Air

DDC — Direct Digital Controls
Ps — Static Pressure

NOTES:

1. 45R maximum primary airflow (cfm) is based on 1.00 in. wg velocity

2. Minimum recommended primary airflow (cfm) is based on 0.03 in.

Conditioning Engineers

pressure signal (VP), per inlet size, using a standard linear averag­ing sensor.

wg differential pressure of the linear inlet flow sensor, or 0 airflow.

0.03 in. wg is equal to 15% to 20% of the nominal flow rating of the
terminal. Less than 15% to 20% may result in greater than +5%
control of box flow.

MOTOR AMPS FAN AIRFLOW (cfm)

120V 208/230V 277V Max Min Max Min

2.8 1.5 1.0 620 250 522 90 52 0.10 0.10 0.10

2.8 1.5 1.0 620 250 927 160 93 0.18 0.18 0.18

3.9 2.1 1.4 830 450 2066 358 207 0.17 0.17 0.17

Min

500 90 or 0 52 or 0

1400 250 or 0 145 or 0

†For all controls except ComfortID controls. Some DDC controls supplied by

others may have differing limitations. This value is based on a signal of

0.03 in. wg differential pressure of the linear averaging flow probe.

NOTE: Data is based on tests conducted in accordance with ARI (Air Condi­tioning and Refrigeration Institute) Standard 880-98.

PRIMARY AIRFLOW

(cfm)

Min

ComfortID

3. 45R maximum fan airflow (cfm) is based on 0.25 in. wg external
(downstream) static pressure.

4. 45R minimum fan airflow (cfm) is based on maximum external
(downstream) static pressure 0.60 in. wg.

5. Minimum primary airflow (cfm) listed is for all controls except Com­fortID controls which is shown separately with lower available mini­mum CFMs. Some DDC controls supplied by others may have
different limitations.

6. Minimum pressure, Ps (in. wg) on 45R water coil units is based on
coil located on induction port.

7. Do not select discharge temperature exceeding 120 F. In addition,
ASHRAE recommends a maximum discharge temperature of 90 F
to avoid room air stratification when heating from the ceiling (2001
Fundamentals, Chapter 32).

ComfortID

MINIMUM Ps (in. wg)

None or

Elec. Heat

Max Min

1000 250

1600 400

1 Row

Hot Water

2 Rows

Hot Water

15

Speed Controller — Each Carrier fan powered air ter-

minal unit is equipped with a fan SCR speed controller, located
on the bottom of the control box. The SCR can be adjusted in
the field.

NOTE: The 45J size 7 unit and 45Q size 4 unit have 2 SCR
speed controllers, one for each fan. One SCR is located in the
standard position at the bottom of the control box; the other is
at the top of the control box.

The fan airflow output is dependent on the setting of the

controller and the downstream static resistance.

CAUTION

The minimum stop on the speed controller is factory set at
an internal minimum stop to prevent damage to the motor.
Do not attempt to override this minimum stop or electrical
damage to the fan motor may result.

TO INCREASE THE FAN SPEED (RPM), turn the slotted
adjustment on the controller clockwise toward the “HI” mark­ing printed on the controller face plate. (Refer to Fig. 10.)

TO DECREASE THE FAN SPEED (RPM), turn the adjust­ment counterclockwise toward the “LO” marking. (See
Fig. 10.)

ComfortID™ VAV CONTROLS

Install Sensors and Make Field Wiring
Connections

GENERAL — All field wiring must comply with National
Electrical Code and local requirements.

CAUTION

DO NOT run sensor or relay wires in the same conduit or
raceway with Class 1 service wiring.

DO NOT abrade or nick the outer jacket of cable.
DO NOT pull or draw cable with a force that may harm the

physical or electrical properties.
DO NOT bend a cable through a radius sharper than that

recommended by its manufacturer.
AVOID splices in any control wiring.

Perform the following steps if state or local code requires
the use of conduit, or if your installation requires a cable length
of more than 8 ft:

1. Disconnect the sensor cable from the ComfortID zone
controller, at the terminals labeled SAT and GND.

2. Mount the sensor to the duct (see Steps 2 and 3 above).

3. Mount a field-supplied 4 in. x 4 in. x 2 in. extension box
over the duct sensor.

4. Connect a conduit (
enclosure and extension box.

1

/2-in. nominal) to the zone controller

WARNING

Disconnect electrical power before wiring inside the con­troller. Electrical shock, personal injury, or damage to the
zone controller can result.

Wire the control as shown on the control package diagram
for the specific installation. Control wiring diagrams can be
found inside the control box.

SUPPLY-AIR TEMPERATURE (SAT) SENSOR INSTAL­LATION — On terminals with heat, the SAT sensor is pro­vided. The sensor is factory wired to the controller and shipped
in the control box. The SAT must be field-installed in the duct
downstream from the air terminal. See Fig. 11. The SAT sensor
part number is 33ZCSENSAT. See Table 14 for resistance
information.

To install the sensor, proceed as follows:

1. Remove the plug from one of the
control box and pass the sensor probe through the hole.

2. Drill or punch a

1

/2-in. hole in the duct downstream of
the unit, at a location meeting the requirements shown in
Fig. 11.

3. Using 2 self-drilling screws (supplied), secure the sensor
probe to the duct.

The SAT sensor probe is 6 inches in length. The tip of the
probe must not touch the inside of the duct. Use field-supplied
bushings as spacers when mounting the probe in a duct that is
6 in. or less in diameter.

If the unit is not equipped with heat, the SAT sensor is not
provided and is not required.

For units equipped with electric heat, locate the sensor as far
downstream as possible. This ensures the sensor will not be
affected by excessive radiant heat from the heater coil. Install
the sensor a minimum of 2 ft downstream of the coil for units
with hot water heat.

7

/8-in. openings in the

277 V 12L

LO

5 FLA

6

Z

50

RANCO

MXF-544002-001

100533-01

HI

UR

Fig. 10 — Fan Speed Controller

UNIT WITH HEAT

2 FT. MIN.

PRIMARY
AIR INLET

LEGEND

SAT — Supply Air Temperature Sensor
ZC — Zone Controller

AIR

TERMINAL

UNIT

ZC

HEAT

Fig. 11 — Supply Air Temperature Probe

(Part No. 33ZCSENSAT) Location

SAT

16