Bryant 551J Users Manual II551J 02

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551J
SINGLE PACKAGE ROOFTOP
COOLING ONLY

SIZES 04 -- 06 with PURONR (R--410A) REFIRGERANT

Installation Instructions
NOTE: Read the entire instruction manual before starting
the installation

TABLE OF CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . . . 5
Step 2 - Plan for Sequence of Unit Installation . . . . . . 5
Step 3 - Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 4 - Provide Unit Support . . . . . . . . . . . . . . . . . . . 6
Step 5 - Field Fabricate Ductwork . . . . . . . . . . . . . . . . 8
Step 6 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 8
Step 7 - Convert to Horizontal and Connect
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Step 8 - Install Outside Air Hood . . . . . . . . . . . . . . . . 9
Step 9 - Install External Condensate Trap
and Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 10 - Make Electrical Connections . . . . . . . . . . . 11
Step 11 - Adjust Factory-- Installed Options . . . . . . . . 35
Step 12 - Install Accessories . . . . . . . . . . . . . . . . . . . 36

SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal
injury or property damage. Consult a qualified installer,
service agency, or your distributor or branch for
information or assistance. The qualified installer or
agency must use factory-- authorized kits or accessories
when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when
installing.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and
have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriate
national electrical codes (in USA, ANSI/NFPA70,
National Electrical Code (NEC); in Canada, CSA C22.1)
for special requirements.
It is important to recognize safety information. This is the
. When you see this symbol on the
safety-- alert symbol
unit and in instructions or manuals, be alert to the
potential for personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the
safety-- alert symbol. DANGER identifies the most serious
hazards which will result in severe personal injury or
death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify
unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.

!

WARNING

!

PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal
injury or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal.
Ware safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.

ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance operations
on unit, turn off main power switch to unit and install
lockout tag. Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit
rating plate. Unit may have more than one power
switch.

551J

!
j

WARNING

WARNING

!

CAUTION

CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts and servicing
equipment.

UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
Puronr (R-- 410A) refrigerant systems operate at
higher pressures than standard R-- 22 systems. Do not
use R-- 22 service equipment or components on Puron
refrigerant equipment.

2

551J
Vertical Connections / Economizer

Horizontal Connections / Economizer

Fig. 1 - Unit Dimensional Drawing
3

C10057

j

551J

j

Fig. 1 - Unit Dimensional Drawing (cont.)

4

C10058

INSTALLATION

Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents or other sources of contaminated
air.

Complete the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) ANSI/NFPA 70 for special installation requirements.
2. Determine unit location (from project plans) or select
unit location.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.

Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb
or other) that provides for minimum clearances required
for safety (including clearance to combustible surfaces),
unit performance and service access below, around and
above unit as specified in unit drawings. See Fig. 2.

1

18” (457)

42" (1067)

Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto
the unit.
Select a unit mounting system that provides adequate
height to allow installation of condensate trap per
requirements. Refer to Step 9 — Install External
Condensate Trap and Line – for required trap dimensions.
Roof mount —
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.

Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different
sequences for the steps of unit installation. For example,
on curb-- mounted units, some accessories must be
installed on the unit before the unit is placed on the curb.
Review the following for recommended sequences for
installation steps.
Curb-- mounted installation —
Install curb
Install field-- fabricated ductwork inside curb
Install accessory thru-- base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 9 for
details)
Rig and place unit
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories

18" (457)
42" (1067)

1

Required bottom condensate drain connection.
Otherwise, 36” (914mm) for condensate connection.
C07459

Fig. 2 - Service Clearance Dimensional Drawing
NOTE: Consider also the effect of adjacent units.

Unit may be installed directly on wood flooring or on
Class A, B, or C roof-- covering material when roof curb is
used.

Table 1 – Operating Weights
551J
Component
Base Unit
Economizer
Vertical
Horizontal
Cu Fins
Powered Outlet
Curb
14--- in/356 mm
24--- in/610 mm

*04
458 (208)

UNITS LB (KG)
*05
545 (247)

*06
550 (249)

50 (23)
80 (36)
25 (11)
32 (15)

50 (23)
80 (36)
43 (20)
32 (15)

50 (23)
80 (36)
56 (25)
32 (15)

110 (50)
145 (66)

110 (50)
145 (66)

110 (50)
145 (66)

5

551J

Jobsite Survey

j

Pad-- mounted installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain
connection plug
Rig and place unit
Convert unit to side duct connection arrangement
Install field-- fabricated ductwork at unit duct openings
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories

551J

Frame-- mounted installation —
Frame-- mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific installation plan.
j

Step 3 — Inspect unit
Inspect unit for transportation damage. File any claim
with transportation agency.
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data
plate agree with power supply provided.

Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in
Fig. 3. Assemble and install accessory roof curb in
accordance with instructions shipped with the curb.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are show in
Fig. 4. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit. The accessory thru-- the-- base power and
gas connection package must be installed before the unit
is set on the roof curb.
If electric and control wiring is to be routed through the
basepan, attach the accessory thru-- the-- base service
connections to the basepan in accordance with the
accessory installation instructions.
NOTE: The gasketing of the unit to the roof curb is
critical for a watertight seal. Install gasket supplied with
the roof curb as shown in Fig. 3. Improperly applied
gasket can also result in air leaks and poor unit
performance.
Slab Mount (Horizontal Units Only) —
Provide a level concrete slab that extends a minimum of
6 in. (150 mm) beyond unit cabinet. Install a gravel apron
in front of condenser coil air inlet to prevent grass and
foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb
if required.
Alternate Unit Support (In Lieu of Curb or Slab
Mount) —
A non-- combustible sleeper rail can be used in the unit
curb support area. If sleeper rails cannot be used, support
the long sides of the unit with a minimum of 3 equally
spaced 4-- in. x 4-- in. (102 mm x 102 mm) pads on each
side.

6

CRBTMPWR003A01
CRBTMPWR004A01

B

1’-9 11/16”
[551]

C

1’-4”
[406]

D ALT
DRAIN
HOLE
1 3/4”
[44.5]

ROOF CURB
ACCESSORY

CONTROL ACCESSORY
POWER

POWER

CRRFCURB001A01
3/4”

[19] NPT

11/4” [31.7]

1/2”

[12.7]
NPT

1/2”

[12.7]
NPT

CRRFCURB002A01

A

UNIT SIZE

1’-2”
[356]
2’-0”
[610]

551J*04-06

NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: galvanized steel.
5. Attach ductwork to curb (flanges of duct rest on
curb).
6. Service clearance: 4 ft on each side.
7.

Direction of airflow.

551J

CONNECTOR
PKG. ACCY.

Fig. 3 - Roof Curb Details

7

C10059

j

For units with accessory electric heaters: Horizontal
applications require a minimum clearance to combustible
surfaces of 1--in (25 mm) from duct for first 12--in (305 mm)
away from unit. Vertical applications do not require a
minimum clearance around ductwork.

Step 6 — Rig and Place Unit
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B
0.5” (13)

B-C
1.0” (25)

A-C
1.0” (25)
C06110

Fig. 4 - Unit Leveling Tolerances

Lifting holes are provided in base rails as shown in Fig. 5.
Refer to rigging instructions on unit.

551J

Step 5 — Field Fabricate Ductwork

j

Keep unit upright and do not drop. Spreader bars are not
required if top crating is left on unit. Rollers may be used
to move unit across a roof. Level by using unit frame as a
reference. See Table 1 and Fig. 5 for additional
information.

Cabinet return-air static pressure (a negative condition)
shall not exceed 0.35 in. wg (87 Pa) with economizer or
0.45 in. wg (112 Pa) without economizer.

Before setting the unit onto the curb, recheck gasketing on
curb.

!

For vertical ducted applications, secure all ducts to roof
curb and building structure on vertical ducted units. Do
not connect ductwork to unit.

CAUTION

UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
If using top crate as spreader bar, once unit is set,
carefully lower wooden crate off building roof top to
ground. Ensure that no people or obstructions are
below prior to lowering the crate.

Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in
accordance with applicable codes.
Ducts passing through unconditioned spaces must be
insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with
applicable fire codes.

C06005

UNIT
551J*04A
551J*05A
551J*06A
NOTES:

MAX WEIGHT
LB
700
830
865

KG
318
377
393

A
IN
74.5
74.5
74.5

MM
1890
1890
1890

DIMENSIONS
B
IN
MM
36.5
925
36.5
925
36.0
915

C
IN
33.5
41.5
41.5

MM
850
1055
1055

1. Dimensions in ( ) are in millimeters.
2. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the
unit center of gravity. Use wooden top to prevent rigging straps from damaging unit.

Fig. 5 - Rigging Details

8

Positioning on Curb —
Position unit on roof curb so that the following clearances
are maintained: 1/4 in. (6.4 mm) clearance between the
roof curb and the base rail inside the front and rear, 0.0 in.
clearance between the roof curb and the base rail inside on
the duct end of the unit. This will result in the distance
between the roof curb and the base rail inside on the
condenser end of the unit being approximately equal to
Fig. 3, section C-- C.

Do not cover or obscure visibility to the unit’s informative
data plate when insulating horizontal ductwork.

Step 8 — Install Outside Air Hood
The outdoor hood components are shipped in a box
located in the unit return air compartment behind the
outdoor-- ar opening access panel (or economizer). Access
is through the filter access panel. See Fig. 7.
FILTER ACCESS PANEL

Although unit is weatherproof, guard against water from
higher level runoff and overhangs.

CAUTION

UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.

COMPRESSOR
ACCESS PANEL

551J

!

OUTDOOR-AIR OPENING AND
INDOOR COIL ACCESS PANEL

Fig. 7 - Typical Access Panel Locations

After unit is in position, remove rigging skids and
shipping materials.

C06023

1. To remove the existing unit filter access panel, raise
the panel and swing the bottom outward. The panel is
now disengaged from the track and can be removed.
2. To remove the component box from its shipping position, remove the screw holding the hood box bracket
to the top of the economizer. Slide the hood box out
of the unit. See Fig. 8.

Step 7 — Convert to Horizontal and Connect
Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit
without factory--installed economizer or return air smoke
detector option may be field--converted to horizontal ducted
configuration. To convert to horizontal configuration,
remove screws from side duct opening covers and remove
covers. Using the same screws, install covers on vertical
duct openings with the insulation--side down. Seals around
duct openings must be tight. See Fig. 6.

B
Hood

ox

Fig. 8 - Hood Box Removal

HOOD BOX
BRACKET

C06024

Motorized 2-- Position Damper Hood —

Fig. 6 - Horizontal Conversion Panels

1. Assemble outdoor-- air hood top and side plates as
shown in Fig. 9. Install seal strips on hood top and
sides. Put aside screen retainer and screws for later
assembly.
2. Fasten hood top and side plate assembly to unit with
screws provided. See Fig. 9.
3. Slide outdoor-- air inlet screen into screen track on
hood side plates. While holding screen) in place,
fasten screen retainer to hood using screws provided.
4. Replace filter access panel. See Fig. 7.

C06108

Field-- supplied flanges should be attached to horizontal
duct openings and all ductwork should be secured to the
flanges. Insulate and weatherproof all external ductwork,
joints, and roof or building openings with counter flashing
and mastic in accordance with applicable codes.

9

j

SCREEN
RETAINER

SEAL STRIP
HOOD TOP

HOOD SIDE

SEAL STRIP
SEAL STRIP

SIDE
PANEL

SCREEN
TRACKS

HOOD
SIDE
OUTDOOR AIR INLET SCREEN

OUTDOOR-AIR HOOD – UNASSEMBLED

HOOD TOP

INDOOR
COIL
ACCESS
PANEL

TOP
SIDE
PANEL

CAULK
HERE

INDOOR
COIL
ACCESS
PANEL

HOOD
SIDE

C06025

551J

TRACKS FOR AIR
INLET SCREEN

Fig. 10 - Indoor Coil Access Panel Relocation

j
HOOD SIDES AND TOP ASSEMBLED

Fig. 9 - Outdoor-- Air Hood Details

C07504

TOP
PANEL
INDOOR COIL
ACCESS PANEL

Economizer Hood —
NOTE: If the power exhaust accessory is to be installed
on the unit, the hood shipped with the unit will not be
used and must be discarded. Save the aluminum filter for
use in the power exhaust hood assembly.
1. The indoor coil access panel will be used as the top of
the hood. Remove the screws along the sides and bottom of the indoor coil access panel. See Fig. 10.
2. Swing out indoor coil access panel and insert the
hood sides under the panel (hood top). Use the screws
provided to attach the hood sides to the hood top. Use
screws provided to attach the hood sides to the unit.
See Fig. 11.
3. Remove the shipping tape holding the economizer barometric relief damper in place.
4. Insert the hood divider between the hood sides. See
Fig. 11 and 12. Secure hood divider with 2 screws on
each hood side. The hood divider is also used as the
bottom filter rack for the aluminum filter.
5. Open the filter clips which are located underneath the
hood top. Insert the aluminum filter into the bottom
filter rack (hood divider). Push the filter into position
past the open filter clips. Close the filter clips to lock
the filter into place. See Fig. 12.
6. Caulk the ends of the joint between the unit top panel
and the hood top.
7. Replace the filter access panel.

LEFT
HOOD
SIDE

SCREW
19 1/16”
B

(483mm)

33 3/8”

(848mm)

HOOD DIVIDER

Fig. 11 - Economizer Hood Construction

C06026

DIVIDER
OUTSIDE
AIR
HOOD
CLEANABLE
ALUMINUM
FILTER

FILTER

BAROMETRIC
RELIEF
FILTER
CLIP

Fig. 12 - Economizer Filter Installation

10

C06027

Step 10 — Make Electrical Connections

!

The unit has one 3/4-in. condensate drain connection on
the end of the condensate pan and an alternate connection
on the bottom. See Fig. 13. Unit airflow configuration
does not determine which drain connection to use. Either
drain connection can be used with vertical or horizontal
applications.

CONDENSATE PAN (SIDE VIEW)
STANDARD
DRAIN PLUG
SIDE DRAIN
(FACTORY-INSTALLED)

C08021

When using the standard side drain connection, ensure the
red plug in the alternate bottom connection is tight. Do this
before setting the unit in place. The red drain pan plug can
be tightened with a 1/2- in. square socket drive extension.
To use the alternate bottom drain connection, remove the
red drain plug from the bottom connection (use a 1/2 - in.
square socket drive extension) and install it in the side
drain connection.
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 14.

MINIMUM PITCH
1” (25mm) PER
10’ (3m) OF LINE

BASE RAIL

OPEN
VENT

2˝ (51) MIN

TO ROOF
DRAIN

SEE NOTE

DRAIN PLUG

ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground. Unit
cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of
personal injury if an electrical fault should occur. This
ground may consist of electrical wire connected to
unit ground lug in control compartment, or conduit
approved for electrical ground when installed in
accordance with NEC (National Electrical Code);
ANSI/NFPA 70, latest edition (in Canada, Canadian
Electrical
Code
CSA
[Canadian
Standards
Association] C22.1), and local electrical codes.

ALTERNATE
BOTTOM DRAIN

Fig. 13 - Condensate Drain Pan (Side View)

ROOF
CURB

NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4” (102) trap is recommended
.

Fig. 14 - Condensate Drain Piping Details

C08022

All units must have an external trap for condensate
drainage. Install a trap at least 4-in. (102 mm) deep and
protect against freeze-up. If drain line is installed
downstream from the external trap, pitch the line away
from the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Do
not use a pipe size smaller than the unit connection
( 3/4 -in.).

WARNING

NOTE: Check all factory and field electrical connections
for tightness. Field-- supplied wiring shall conform with
the limitations of 63_F (33_C) rise.
Field Power Supply —
If equipped with optional Powered Convenience Outlet:
The power source leads to the convenience outlet’s
transformer primary are not factory connected. Installer
must connect these leads according to required operation
of the convenience outlet. If an always-- energized
convenience outlet operation is desired, connect the
source leads to the line side of the unit-- mounted
disconnect. (Check with local codes to ensure this method
is acceptable in your area.) If a de-- energize via unit
disconnect switch operation of the convenience outlet is
desired, connect the source leads to the load side of the
unit disconnect. On a unit without a unit-- mounted
disconnect, connect the source leads to compressor
contactor C and indoor fan contactor IFC pressure lugs
with unit field power leads.
Refer to Fig. 19 for power transformer connections and
the discussion on connecting the convenience outlet on
page 12.
Field power wires are connected to the unit at line-- side
pressure lugs on compressor contactor C and indoor fan
contactor IFC (see wiring diagram label for control box
component arrangement) or at factory-- installed option
non-- fused disconnect switch. Max wire size is #2 AWG
(copper only). (See Fig. 15.)
NOTE: TEST LEADS - Unit may be equipped with
short leads (pigtails) on the field line connection points on
contactor C or optional disconnect switch. These leads are
for factory run-- test purposes only; remove and discard
before connecting field power wires to unit connection
points. Make field power connections directly to line
connection pressure lugs only.

11

551J

Step 9 — Install External Condensate Trap
and Line

j

Units Without Factory-- Installed Disconnect —

Units Without Disconnect Option
1-ph Belt Drive IFM
C

C
11

23

11

Disconnect
per
NEC

IFC
13

13

or

Direct Drive IFM

TB

23

Disconnect
per
NEC
L1

208/230-1-60

L2

All units —
All field wiring must comply with NEC and all local
codes. Size wire based on MCA (Minimum Circuit Amps)
on the unit informative plate. See Fig. 15 and the unit
label diagram for power wiring connections to the unit
power terminal blocks and equipment ground. Maximum
wire size is #2 ga AWG per pole.

L3

208/230-3-60
460-3-60
575-3-60

Units With Disconnect Option
2

551J

L1

j

L2

4

L3

6

Provide a ground-- fault and short-- circuit over-- current
protection device (fuse or breaker) per NEC Article 440
(or local codes). Refer to unit informative data plate for
MOCP (Maximum Over-- current Protection) device size.

1
Optional
Disconnect
Switch

3

Factory
Wiring

5

All field wiring must comply with the NEC and local
requirements.

Disconnect factory test leads; discard.

Fig. 15 - Power Wiring Connections

C10056

Units with Factory-- Installed Disconnect —
The factory-- installed option disconnect switch is located
in a weatherproof enclosure located under the main
control box. The manual switch handle is accessible
through an opening in the access panel. Discard the
factory test leads (see Fig. 15).

!

When installing units, provide a disconnect switch per
NEC (National Electrical Code) of adequate size.
Disconnect sizing data is provided on the unit informative
plate. Locate on unit cabinet or within sight of the unit per
national or local codes. Do not cover unit informative
plate if mounting the disconnect on the unit cabinet.

All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is
to be connected to a 208-v power supply, the control
transformer must be rewired by moving the black wire
with the 1/4 -in. female spade connector from the 230-- v
connection and moving it to the 200-v 1/4 -in. male
terminal on the primary side of the transformer. Refer to
unit label diagram for additional information. Field power
wires will be connected line-- side pressure lugs on the
power terminal block or at factory-- installed option
non-- fused disconnect.
NOTE: Check all factory and field electrical connections
for tightness. Field-- supplied wiring shall conform with
the limitations of 63_F (33_C) rise.

WARNING

FIRE HAZARD

Failure to follow this warning could result in
intermittent operation or performance satisfaction.
Do not connect aluminum wire between disconnect
switch and 551J unit. Use only copper wire.
(See Fig. 16.)

Convenience Outlets —

!

ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Units with convenience outlet circuits may use
multiple disconnects. Check convenience outlet for
power status before opening unit for service. Locate
its disconnect switch, if appropriate, and open it.
Tag-- out this switch, if necessary.

ELECTRIC
DISCONNECT
SWITCH
COPPER
WIRE ONLY
ALUMINUM
WIRE

Fig. 16 - Disconnect Switch and Unit

A93033

WARNING

Two types of convenience outlets are offered on 551J
models: Non-- powered and unit-- powered. Both types
provide a 125-volt GFCI (ground-- fault circuit-- interrupter)
duplex receptacle rated at 15-- A behind a hinged
waterproof access cover, located on the end panel of the
unit. See Fig. 17.

12

Pwd-CO
Transformer

Convenience
Outlet
GFCI

Pwd-CO
Fuse
Switch

Non-- powered type: This type requires the field
installation of a general-- purpose 125-- volt 15-- A circuit
powered from a source elsewhere in the building. Observe
national and local codes when selecting wire size, fuse or
breaker requirements and disconnect switch size and
location. Route 125-- v power supply conductors into the
bottom of the utility box containing the duplex receptacle.

Control Box
Access Panel

Fig. 17 - Convenience Outlet Location

C08128

Installing Weatherproof Cover –
A
weatherproof
while-in-use
cover
for
the
factory-installed convenience outlets is now required by
UL standards. This cover cannot be factory-mounted due
its depth; it must be installed at unit installation. For
shipment, the convenience outlet is covered with a blank
cover plate.

The primary leads to the convenience outlet transformer
are not factory-- connected. Selection of primary power
source is a customer-- option. If local codes permit, the
transformer primary leads can be connected at the
line-- side terminals on the unit-- mounted non-- fused
disconnect or HACR breaker switch; this will provide
service power to the unit when the unit disconnect switch
or HACR switch is open. Other connection methods will
result in the convenience outlet circuit being de-- energized
when the unit disconnect or HACR switch is open. See
Fig. 19.

The weatherproof cover kit is shipped in the unit’s control
box. The kit includes the hinged cover, a backing plate
and gasket.
DISCONNECT ALL POWER
CONVENIENCE OUTLET.

TO

UNIT

AND

Remove the blank cover plate at the convenience outlet;
discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until
approximately 1/2-in (13 mm) under screw heads are
exposed. Press the gasket over the screw heads. Slip the
backing plate over the screw heads at the keyhole slots
and align with the gasket; tighten the two screws until
snug (do not over-tighten).
Mount the weatherproof cover to the backing plate as
shown in Fig. 18. Remove two slot fillers in the bottom of
the cover to permit service tool cords to exit the cover.
Check for full closing and latching.
COVER – WHILE-IN-USE
WEATHERPROOF

RECEPTACLE
NOT INCLUDED

C08283

UNIT
VOLTAGE

CONNECT
AS

PRIMARY
CONNECTIONS

TRANSFORMER
TERMINALS

208,
230

240

L1: RED +YEL
L2: BLU + GRA

H1 + H3
H2 + H4

460

480

L1: RED
Splice BLU + YEL
L2: GRA

H1
H2 + H3
H4

575

600

L1: RED
L2: GRA

H1
H2

Fig. 19 - Powered Convenience Outlet Wiring
Fuse on power type: The factory fuse is a Bussman
“Fusetron” T-- 15, non-- renewable screw-- in (Edison base)
type plug fuse.
BASE PLATE FOR
GFCI RECEPTACLE

Fig. 18 - Weatherproof Cover Installation

C09022

13

551J

Unit-- powered type: A unit-- mounted transformer is
factory-- installed to stepdown the main power supply
voltage to the unit to 115-- v at the duplex receptacle. This
option also includes a manual switch with fuse, located in
a utility box and mounted on a bracket behind the
convenience outlet; access is through the unit’s control
box access panel. See Fig. 17.

j

hole must be field cut in the main control box bottom on
the left side so the 24-- v control connections can be made.
Connect the control power conduit to the unit control box
at this hole.

NOTICE
Convenience Outlet Utilization
Maximum Intermittent use : 15 Amps 2 to 3 Hours

Units without Thru-- Base Connections —

Maximum Continuous use : 8 Amps 24/7
50HJ542739

1. Install power wiring conduit through side panel openings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown
in Fig. 15.

3.0

A9225

Fig. 20 - Convenience Outlet Utilization Notice Label

551J

Duty Cycle: the unit--powered convenience outlet has a duty
cycle limitation. The transformer is intended to provide
power on an intermittent basis for service tools, lamps, etc; it
is not intended to provide 15--amps loading for continuous
duty loads (such as electric heaters for overnight use).
Observe a 50% limit on circuit loading above 8--amps.
j

Convenience outlet usage rating:
Continuous usage: 8 amps maximum
Intermittent usage: up to 15 amps maximum for
up to 2 hours maximum
Test the GFCI receptacle by pressing the TEST button on
the face of the receptacle to trip and open the receptacle.
Check for proper grounding wires and power line phasing
if the GFCI receptacle does not trip as required. Press the
RESET button to clear the tripped condition.

Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 4. On 3-- phase units, voltages between phases must
be balanced within 2% and the current within 10%. Use
the formula shown in the legend for Table 5, Note 2 to
determine the percent of voltage imbalance. Operation on
improper line voltage or excessive phase imbalance
constitutes abuse and may cause damage to electrical
components. Such operation would invalidate any
applicable Bryant warranty.
Field Control Wiring —
The 551J unit requires an external temperature control
device. This device can be a thermostat emulation device
provided as part of a third-- party Building Management
System.

Factory-- Option Thru-- Base Connections —

Thermostat —

This service connection kit consists of a 1/2 - in electrical
bulkhead connector and a 3/4 - in electrical bulkhead
connector, all factory-- installed in the embossed (raised)
section of the unit basepan in the condenser section. The
3/ - in bulkhead connector enables the low-- voltage control
4
wires to pass through the basepan. The 1/2 - in electrical
bulkhead connector allows the high-- voltage power wires
to pass through the basepan. See Fig. 21.

Install a Bryant-- approved accessory thermostat according
to installation instructions included with the accessory.
For complete economizer function, select a two-- stage
cooling thermostat. Locate the thermostat accessory on a
solid wall in the conditioned space to sense average
temperature in accordance with the thermostat installation
instructions.

LOW VOLTAGE
CONDUIT
CONNECTOR

HIGH VOLTAGE
CONDUIT
CONNECTOR

Fig. 21 - Thru-- Base Connection Fittings

C08637

Check tightness of connector lock nuts before connecting
electrical conduits.
Field-- supplied and field-- installed liquid tight conduit
connectors and conduit may be attached to the connectors
on the basepan. Pull correctly rated high voltage and low
voltage through appropriate conduits. Connect the power
conduit to the internal disconnect (if unit is so equipped)
or to the external disconnect (through unit side panel). A

If the thermostat contains a logic circuit requiring 24-- v
power, use a thermostat cable or equivalent single leads of
different colors with minimum of seven leads. If the
thermostat does not require a 24-- v source (no “C”
connection required), use a thermostat cable or equivalent
with minimum of six leads. Check the thermostat
installation instructions for additional features which
might require additional conductors in the cable.
Using unit-- mounted convenience outlets: Units with
unit-- mounded convenience outlet circuits will often
require that two disconnects be opened to de-- energize all
power to the unit. Treat all units as electrically energized
until the convenience outlet power is also checked and
de-- energization is confirmed. Observe National Electrical
Code Article 210, Branch Circuits, for use of convenience
outlets.
For wire runs up to 50 ft. (15 m), use no. 18 AWG
(American Wire Gage) insulated wire [35_C (95_F)
minimum]. For 50 to 75 ft. (15 to 23 m), use no. 16 AWG
insulated wire [35_C (95_F) minimum]. For over 75 ft.
(23 m), use no. 14 AWG insulated wire [35_C (95_F)
minimum]. All wire sizes larger than no. 18 AWG cannot
be directly connected to the thermostat and will require a
junction box and splice at the thermostat.
14

Typical
Thermostat
Connections

NOTE: If thru-- the-- bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.

Central
Terminal
Board

Heat Anticipator Settings —

X

C

G

G

W2

W2

W1

W1

O/B/Y2
(Note 1)

Y2
(Note 2)

Y1

Y1

R

R

Set heat anticipator settings at 0.14 amp for the first stage
and 0.14 amp for second-- stage heating, when available.

T
H
E
R
M
O
S
T
A
T

Electric Heaters
551J units may be equipped with field-- installed accessory
electric heaters. The heaters are modular in design, with
heater frames holding open coil resistance wires strung
through ceramic insulators, line-- break limit switches and
a control contactor. One or two heater modules may be
used in a unit.
Heater modules are installed in the compartment below
the indoor (supply) fan outlet. Access is through the
indoor access panel. Heater modules slide into the
compartment on tracks along the bottom of the heater
opening. See Fig. 24, Fig. 25 and Fig. 26.

Note 1: Typical multi-function marking. Follow manufacturer’s configuration
Instructions to select Y2.
Note 2: Y2 to Y2 connection required on single-stage cooling units when
integrated economizer function is desired.
Field Wiring

DISCONNECT MOUNTING
LOCATION

C08069

Fig. 22 - Low-- Voltage Connections
Unit without thru-- base connection kit —

Pass the thermostat control wires through the hole
provided in the corner post; then feed the wires through
the raceway built into the corner post to the control box.
Pull the wires over to the terminal strip on the upper-- left
corner of the Controls Connection Board. See Fig. 23.
RACEWAY

UNIT BLOCK-OFF
PANEL

INDOOR
ACCESS
PANEL

OUTDOOR
ACCESS PANEL

C08133

Fig. 24 - Typical Access Panel Location (3-- 6 Ton)

Not all available heater modules may be used in every
unit. Use only those heater modules that are UL listed for
use in a specific size unit. Refer to the label on the unit
cabinet for the list of approved heaters.
Unit heaters are marked with Heater Model Numbers. But
heaters are ordered as and shipped in cartons marked with
a corresponding heater Sales Package part number. See
Table 2 for correlation between heater Model Number and
Sales Package part number.
NOTE: The value in position 9 of the part number differs
between the sales package part number (value is 1) and a
bare heater model number (value is 0).

HOLE IN END PANEL (HIDDEN)

Fig. 23 - Field Control Wiring Raceway

C08027

Table 2 – Heater Model Number
Bare Heater Model Number

C

R

H

E

A

T

E

R

0

0

1

A

0

0

Heater Sales Package PNO
Includes:
Bare Heater
Carton and packing materials
Installation sheet

C

R

H

E

A

T

E

R

1

0

1

A

0

0

15

551J

C

j

13

CONTROL
BOX

23

CENTER MANUAL RESET
POST
LIMIT SWITCH
HEATER
COVERS

11

EMT OR RIGID CONDUIT SINGLE
(FIELD-SUPPLIED)
POINT BOX

21

DISCONNECT
MOUNTING
LOCATION

BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES

551J

23
13

C08134

21

Fig. 25 - Typical Component Location

FOAM
BUSHING

11

SINGLE POINT
MAIN
BRACKET AND BOX
HEATER
HEATER
HEATER
CONTROL CONDUIT
MOUNTING
MODULE
MODULE
MOUNTING
BOX
DRIP BOOT
SCREW
(LOCATION 1) (LOCATION 2) BRACKET
CONTROL WIRE TERMINAL BLOCK

ALLIED PA
CORP.

MODEL NO.

OD

ERIAL NO.

22.2
ISTED AIR
NDITIONING
UIP ACCESS
346N

23

.

P/N

2-

1
3
5610-4

REV

HEATER
RELAYS
HEATER
MOUNTING
SCREWS

Fig. 27 - Typical Single Point Installation

j

TRACK

FLANGE

C08136

Low-- Voltage Control Connections — Pull the
low-- voltage control leads from the heater module(s) VIO and BRN (two of each if two modules are installed;
identify for Module #1) - to the 4-- pole terminal board
TB4 located on the heater bulkhead to the left of Heater
#1. Connect the VIO lead from Heater #1 to terminal
TB4-- 1. For 2 stage heating, connect the VIO lead from
Heater #2 to terminal TB4-- 2. For 1 stage heating with 2
heater modules connect the VIO lead from both Heater #1
and #2 to terminal TB4-- 1. Connect both BRN leads to
terminal TB4-- 3. See Fig. 28.
CTB

Fig. 26 - Typical Module Installation

C08135

CONTL
BOARD
2

Single Point Boxes and Supplementary Fuses — When
the unit MOCP device value exceeds 60-- A, unit-- mounted
supplementary fuses are required for each heater circuit.
These fuses are included in accessory Single Point Boxes,
with power distribution and fuse blocks. The single point
box will be installed directly under the unit control box,
just to the left of the partition separating the indoor
section (with electric heaters) from the outdoor section.
The Single Point Box has a hinged access cover. See
Fig. 27. The Single Point Box also includes a set of
power taps and pigtails to complete the wiring between
the Single Point Box and the unit’s main control box
terminals. Refer to the accessory heater and Single Point
Box installation instructions for details on tap
connections.
All fuses on 551J units are 60-- A. (Note that all heaters are
qualified for use with a 60-- A fuse, regardless of actual
heater ampacity, so only 60-- A fuses are necessary.)
Single Point Boxes without Fuses — Unit heater
applications not requiring supplemental fuses require a
special Single Point Box without any fuses. The accessory
Single Point Boxes contain a set of power taps and pigtails
to complete the wiring between the Single Point Box and
the unit’s main control box terminals. Refer to accessory
heater and Single Point Box installation instructions for
details on tap connections.

VIO

3

ORN

12

BRN

TB4

Field
Connections

ORN

VIO

BRN

1

2

3

VIO

VIO

BRN

BRN

Elec Htr
VIO
HR2
VIO

HR1

BRN
BRN

HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)

Fig. 28 - Accessory Electric Heater Control
Connections

16

C08331

Smoke Detectors —
Smoke detectors are available as factory-- installed options
on 551J models. Smoke detectors may be specified for
Supply Air only or for Return Air without or with
economizer or in combination of Supply Air and Return
Air. Return Air smoke detectors are arranged for vertical
return configurations only. All components necessary for
operation are factory-- provided and mounted. The unit is
factory-- configured for immediate smoke detector
shutdown operation; additional wiring or modifications to
unit terminal board may be necessary to complete the unit
and smoke detector configuration to meet project
requirements.

Duct smoke sensor
controller

Conduit nuts
(supplied by installer)

Conduit support plate
Terminal block cover
Controller housing
and electronics

Units equipped with factory-- optional Return Air smoke
detectors require a relocation of the sensor module at unit
installation. See “Completing Installation of Return Air
Smoke Sensor:” on page 19 for details.

Cover gasket
(ordering option)
Controller cover

Conduit couplings
(supplied by installer)

551J

Fastener
(2X)

System
The smoke detector system consists of a four-- wire
controller and one or two sensors. Its primary function is
to shut down the rooftop unit in order to prevent smoke
from circulating throughout the building. It is not to be
used as a life saving device.

Trouble
Alarm

Power

Test/reset
switch

Controller
Fig. 29 - Controller Assembly

The controller (see Fig. 29) includes a controller housing,
a printed circuit board, and a clear plastic cover. The
controller can be connected to one or two compatible duct
smoke sensors. The clear plastic cover is secured to the
housing with a single captive screw for easy access to the
wiring terminals. The controller has three LEDs (for
Power, Trouble and Alarm) and a manual test/reset button
(on the cover face).

Duct smoke sensor

Sensor
The sensor (see Fig. 30) includes a plastic housing, a
printed circuit board, a clear plastic cover, a sampling
tube inlet and an exhaust tube. The sampling tube (when
used) and exhaust tube are attached during installation.
The sampling tube varies in length depending on the size
of the rooftop unit. The clear plastic cover permits visual
inspections without having to disassemble the sensor. The
cover attaches to the sensor housing using four captive
screws and forms an airtight chamber around the sensing
electronics. Each sensor includes a harness with an RJ45
terminal for connecting to the controller. Each sensor has
four LEDs (for Power, Trouble, Alarm and Dirty) and a
manual test/reset button (on the left-- side of the housing).

C08208

Exhaust tube

Exhaust gasket
Sensor housing
and electronics
See
Detail A

Intake
gasket

Cover gasket
(ordering option)

TSD-CO2
(ordering option)

Sensor cover

Plug
Sampling tube
(ordered separately)

Coupling
Detail A

Air is introduced to the duct smoke detector sensor’s
sensing chamber through a sampling tube that extends into
the HVAC duct and is directed back into the ventilation
system through a (shorter) exhaust tube. The difference in
air pressure between the two tubes pulls the sampled air
through the sensing chamber. When a sufficient amount of
smoke is detected in the sensing chamber, the sensor
signals an alarm state and the controller automatically
takes the appropriate action to shut down fans and
blowers, change over air handling systems, notify the fire
alarm control panel, etc.

Magnetic
test/reset
switch

Alarm
Trouble

Power
Dirty

Fig. 30 - Smoke Detector Sensor

17

C08209

j

The sensor uses a process called differential sensing to
prevent gradual environmental changes from triggering
false alarms. A rapid change in environmental conditions,
such as smoke from a fire, causes the sensor to signal an
alarm state but dust and debris accumulated over time
does not.

Return Air Detector module
(shipping position shown)*

Controller module

For installations using two sensors, the duct smoke
detector does not differentiate which sensor signals an
alarm or trouble condition.

551J

Smoke Detector Locations

j

Supply Air — The Supply Air smoke detector sensor is
located to the left of the unit’s indoor (supply) fan. See
Fig. 31. Access is through the fan access panel. There is
no sampling tube used at this location. The sampling tube
inlet extends through the side plate of the fan housing
(into a high pressure area). The controller is located on a
bracket to the right of the return filter, accessed through
the lift-- off filter panel.

Return Air Detector Sampling Tube
*RA detector must be moved from shipping position to operating position by installer

C07307

Fig. 32 - Typical Return Air Detector Location

Return Air with Economizer — The sampling tube is
inserted through the side plates of the economizer
housing, placing it across the return air opening on the
unit basepan. See Fig. 33. The holes in the sampling tube
face downward, into the return air stream. The sampling
tube is connected via tubing to the return air sensor that is
mounted on a bracket high on the partition between return
filter and controller location. (This sensor is shipped in a
flat-- mounting location. Installation requires that this
sensor be relocated to its operating location and the tubing
to the sampling tube be connected. See the following
installation procedure.)

Smoke Detector Sensor
C08245

Fig. 31 - Typical Supply Air Smoke Detector Sensor
Location

Return Air without Economizer — The sampling tube is
located across the return air opening on the unit basepan.
See Fig. 32. The holes in the sampling tube face
downward, into the return air stream. The sampling tube is
connected via tubing to the return air sensor that is
mounted on a bracket high on the partition between return
filter and controller location. (This sensor is shipped in a
flat-- mounting location. Installation requires that this
sensor be relocated to its operating location and the tubing
to the sampling tube be connected. See “Completing
Installation of Return Air Smoke Sensor:” for details.)

Return Air
Sampling Tube

C08129

Fig. 33 - Return Air Sampling Tube Location

18

Completing Installation of Return Air Smoke
Sensor:

Screws

C08127

Fig. 35 - Return Air Sensor Operating Position

Additional Application Data — Refer to Catalog No.
HKRNKA-- 1XA for discussions on additional control
features of these smoke detectors including multiple unit
coordination.

Flexible
Exhaust Tubes
Sample Tube
C08126

Fig. 34 - Return Air Detector Shipping Position

19

551J

1. Unscrew the two screws holding the Return Air
Sensor detector plate. See Fig. 34. Save the screws.
2. Remove the Return Air Sensor and its detector plate.
3. Rotate the detector plate so the sensor is facing
outwards and the sampling tube connection is on the
bottom. See Fig. 35.
4. Screw the sensor and detector plate into its operating
position using screws from Step 1. Make sure the
sampling tube connection is on the bottom and the
exhaust tube is on the top. See Fig. 35.
5. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.

j

RTU-- MP control system —

551J

The RTU-- MP controller, see Fig. 36, provides expanded
stand-- alone operation of the HVAC system plus
connection and control through communication with
several Building Automation Systems (BAS) through
popular third-- party network systems. The available
network systems are BACnet MP/TP, Modbus and
Johnson J2. Communication with LonWorks is also
possible by adding an accessory interface card to the
RTU-- MP. Selection of the communication protocol and
baud rate are made at on-- board DIP switches.

The RTU-- MP control is factory-- mounted in the 551J
unit’s main control box, to the left of the CTB. See
Fig. 37. Factory wiring is completed through harnesses
connected to the CTB. Field connections for RTU-- MP
sensors will be made at the Phoenix connectors on the
RTU-- MP board. The factory-- installed RTU-- MP control
includes the supply-- air temperature (SAT) sensor. The
outdoor air temperature (OAT) sensor is included in the
FIOP/accessory EconoMi$er2 package.
Refer to Table 2, RTU-- MP Controller Inputs and Outputs
for locations of all connections to the RTU-- MP board.

j

Fig. 36 - RTU-- MP Multi-- Protocol Control Board

Fig. 37 - 551J Control Box Component Locations
20

C07129

C10049

551J
3

Fig. 38 - RTU-- MP System Control Wiring Diagram
21

C10044

j

Table 3 – RTU-- MP Controller Inputs and Outputs
POINT NAME

BACnet OBJECT
NAME

TYPE OF I/O

CONNECTION PIN
NUMBERS

sptsens

AI (10K Thermistor)

J20---1, 2

INPUTS
Space Temperature Sensor
Supply Air Temperature

sat

AI (10K Thermistor)

J2---1, 2

Local Outside Air Temperature Sensor

oatsens

AI (10K Thermistor)

J2---3, 4

Space Temperature Offset Pot

sptopot

AI (100K Potentiometer)

J20---3

Indoor Air Quality

iaq

AI (4---20 ma)

J4---2, 3

Outdoor Air Quality

oaq

AI (4---20 ma)

J4---5, 6

551J

Safety Chain Feedback

j

safety

DI (24 VAC)

J1---9

Compressor Safety

compstat

DI (24 VAC)

J1---2

Fire Shutdown

firedown

DI (24 VAC)

J1---10

Enthalpy Switch

enthalpy

DI (24 VAC)

J2---6, 7

humstat

DI (24 VAC)

J5---7, 8

Humidistat Input Status

CONFIGURABLE INPUTS*
Space Relative Humidity

sprh

AI (4---20 ma)

Outside Air Relative Humidity

oarh

AI (4---20 ma)

Supply Fan Status

fanstat

DI (24 VAC)

Filter Status

filtstat

DI (24 VAC)

remocc

DI (24 VAC)

Remote Occupancy Input

J4---2,3 or J4---5,6
J5---1,2 or J5---3,4 or
J5 5,6 or J5---7,8

OUTPUTS
Economizer Commanded Position

econocmd

4---20ma

J2---5

sf

DO Relay (24VAC , 1A)

J1---4

Compressor 1 Relay State

comp_1

DO Relay (24VAC , 1A)

J1---8

Compressor 2 Relay State

comp_2

DO Relay (24VAC , 1A)

J1---7

Heat Stage 1 Relay State

heat_1

DO Relay (24VAC , 1A)

J1---6

Heat Stage 2 Relay State

heat_2

DO Relay (24VAC , 1A)

J1---5

Power Exhaust Relay State

aux_2

DO Relay (24VAC , 1A)

J11---3

humizer

DO Relay (24VAC, 1A)

J11---7, 8

Supply Fan Relay State

Dehumidification Relay State

LEGEND
AI --- Analog Input
AO --- Analog Output
DI --- Discrete Input
DO --- Discrete Output
* These inputs (if installed) take the place of the default input on the specific channel according to schematic.
Parallel pins J5--- 1 = J2--- 6, J5--- 3 = J1--- 10, J5--- 5 = J1--- 2 are used for field --- installation.

The RTU-- MP controller requires the use of a Byrant
space sensor. A standard thermostat cannot be used with
the RTU-- MP system.
Supply Air Temperature (SAT) Sensor - On FIOP--equipped
551J unit, the unit is supplied with a supply--air temperature
(SAT) sensor (33ZCSENSAT). This sensor is a tubular probe
type, approx 6--inches (12.7 mm) in length. It is a nominal
10--k ohm thermistor.
The SAT is factory-- wired. The SAT probe is wire-- tied to
the supply-- air opening (on the horizontal opening end) in
its shipping position. Remove the sensor for installation.
Re-- position the sensor in the flange of the supply-- air
opening or in the supply air duct (as required by local
codes). Drill or punch a 1/2 - in. hole in the flange or duct.
Use two field-- supplied, self-- drilling screws to secure the
sensor probe in a horizontal orientation. See Fig. 39.

SUPPLY AIR
TEMPERATURE
SENSOR

ROOF
CURB
SUPPLY AIR

RETURN AIR

C08200

Fig. 39 - Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
22

Outdoor Air Temperature (OAT) Sensor - The OAT is
factory-- mounted in the EconoMi$er2 (FIOP or
accessory). It is a nominal 10k ohm thermistor attached to
an eyelet mounting ring.
EconoMi$er2 - The RTU-- MP control is used with
EconoMi$er2 (option or accessory) for outdoor air
management. The damper position is controlled directly
by the RTU-- MP control; EconoMi$er2 has no internal
logic device.

1

2

3

4

5

6
RED(+)
WHT(GND)
BLK(-)

CCN COM

SEN
SW1

BRN (GND)
BLU (SPT)

Outdoor air management functions can be enhanced with
field-- installation of these accessory control devices:

SENSOR WIRING

Field Connections - Field connections for accessory
sensors and input devices are made the RTU-- MP, at plugs
J1, J2, J4, J5, J11 and J20. All field control wiring that
connects to the RTU-- MP must be routed through the
raceway built into the corner post as shown in Fig. 23.
The raceway provides the UL required clearance between
high-- and low-- voltage wiring. Pass the control wires
through the hole provided in the corner post, then feed the
wires thorough the raceway to the RTU-- MP. Connect to
the wires to the removable Phoenix connectors and then
reconnect the connectors to the board.

Space Temperature (SPT) Sensors
A field-- supplied Byrant space temperature sensor is
required with the RTU-- MP to monitor space temperature.
There are 3 sensors available for this application:

C08201

Fig. 40 - T-- 55 Space Temperature Sensor Wiring

SEN

J20-1

SEN

J20-2

Fig. 41 - RTU-- MP T-- 55 Sensor Connections

C08460

Connect T-- 56 - See Fig. 42 for T-- 56 internal
connections. Install a jumper between SEN and SET
terminals as illustrated. Connect T-- 56 terminals to
RTU-- MP J20-- 1, J20-- 2 and J20-- 3 per Fig. 43.

S 33ZCT55SPT, space temperature sensor with override
button
S 33ZCT56SPT, space temperature sensor with override
button and setpoint adjustment
S 33ZCT59SPT, space temperature sensor with LCD
(liquid crystal display) screen, override button, and
setpoint adjustment

1

2

3

4

SEN
SW1

5

6
RED(+)
WHT(GND)
BLK(-)

SET

BLK
(T56)
BRN (GND)
BLU (SPT)

Use 20 gauge wire to connect the sensor to the controller.
The wire is suitable for distances of up to 500 ft. Use a
three-- conductor shielded cable for the sensor and setpoint
adjustment connections. If the setpoint adjustment
(slidebar) is not required, then an unshielded, 18 or 20
gauge, two-- conductor, twisted pair cable may be used.

CCN COM

SENSOR WIRING

JUMPER
TERMINALS
AS SHOWN

Connect T-- 55 - See Fig. 40 for typical T-- 55 internal
connections. Connect the T-- 55 SEN terminals to
RTU-- MP J20-- 1 and J20-- 2. See Fig. 41.

Cool

Warm

Fig. 42 - T-- 56 Internal Connections

23

C08202

551J

Enthalpy control (outdoor air or differential sensors)
Space CO2 sensor
Outdoor air CO2 sensor
j

SEN

J20-1

SEN

J20-2

Locate the enthalpy control in the economizer next to the
Actuator Motor. Locate two GRA leads in the factory
harness and connect the gray lead labeled “ESL” to the
terminal labeled “LOW”. See Fig. 45. Connect the
enthalpy control power input terminals to economizer
actuator power leads RED (connect to 24V) and BLK
(connect to GND).

Jumper

SET
SET

The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.

J20-3

551J

Fig. 43 - RTU-- MP T-- 56 Sensor Connections

j

C08461

Connect T-- 59 - The T-- 59 space sensor requires a
separate, isolated power supply of 24 VAC. See Fig. 44
for internal connections at the T-- 59. Connect the SEN
terminal (BLU) to RTU-- MP J20-- 1. Connect the COM
terminal (BRN) to J20-- 2. Connect the SET terminal (STO
or BLK) to J20-- 3.

Differential Enthalpy Control — Differential enthalpy
control is provided by sensing and comparing the outside
air and return air enthalpy conditions. Install the outdoor
air enthalpy control as described above. Add and install a
return air enthalpy sensor.
Return Air Enthalpy Sensor — Mount the return-- air
enthalpy sensor (33CSENTSEN) in the return-- air section
of the economizer. The return air sensor is wired to the
enthalpy controller (33CSENTHSW). See Fig. 46.

BRN (COM)
BLK (STO)

SENSOR
WIRING

BLU (SPT)

OR

SET

SEN

OPB

COM- PWR+

RED

GND

BLK

+ VDC
Out

LOW

GRA

ECONO
MOTOR

ESL

+ 24-36
VDC In

POWER
WIRING

24 VAC

24V
– 4-20
Main

– 4-20 Main
Out

NOTE: Must use a separate isolated transformer.

C09027

C07132

Fig. 46 - Outside and Return Air Enthalpy Sensor
Wiring

Fig. 44 - Space Temperature Sensor Typical Wiring
(33ZCT59SPT)

To wire the return air enthalpy sensor, perform the
following:

Economizer controls —
Outdoor Air Enthalpy Control (PNO 33CSENTHSW) -

1. Use a 2-- conductor, 18 or 20 AWG, twisted pair cable
to connect the return air enthalpy sensor to the
enthalpy controller.
2. Connect the field-- supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the
(+) terminal on the enthalpy controller. Connect the
BLK wire to (-- ) spade connector on the return air enthalpy sensor and the (-- ) terminal on the enthalpy
controller.

The enthalpy control (33CSENTHSW) is available as a
field-- installed accessory to be used with the EconoMi$er2
damper system. The outdoor air enthalpy sensor is part of
the enthalpy control. (The separate field-- installed
accessory return air enthalpy sensor (33CSENTSEN) is
required for differential enthalpy control. See Fig. 45.)
Enthalpy
Switch
24V

RED

GND

BLK

LOW

GRA

ECONO
MOTOR

ESL

7

CTB
ECON

Factory Wiring Harness
C09026

Fig. 45 - Enthalpy Switch (33CSENTHSW) Connections

Indoor Air Quality (CO2 sensor) — The indoor air quality
sensor accessory monitors space carbon dioxide (CO2)
levels. This information is used to monitor IAQ levels.
Several types of sensors are available, for wall mounting
in the space or in return duct, with and without LCD
display, and in combination with space temperature
sensors. Sensors use infrared technology to measure the
levels of CO2 present in the space air.
The CO2 sensors are all factory set for a range of 0 to
2000 ppm and a linear mA output of 4 to 20. Refer to the
instructions supplied with the CO2 sensor for electrical
24

requirements and terminal locations. See Fig. 47 for
typical CO2 sensor wiring schematic.

IAQ Sensor
SEN

J4-2

COM

J4-3

24 VAC

+ 0-10VDC
- SIG COM
+ 4-20mA
ALARM
NC
COM RELAY
NO CONTACTS

}

H G 24 VAC
OR
+ - 24 VDC

2 1
J3

8765432 1
J4

Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus
weatherproof enclosure) — The outdoor air CO2 sensor is
designed to monitor carbon dioxide (CO2) levels in the
outside ventilation air and interface with the ventilation
damper in an HVAC system. The OAQ sensor is packaged
with an outdoor cover. See Fig. 49. The outdoor air CO2
sensor must be located in the economizer outside air hood.

C08635

Fig. 47 - Indoor/Outdoor Air Quality (CO2) Sensor
(33ZCSENCO2) - Typical Wiring Diagram

To accurately monitor the quality of the air in the
conditioned air space, locate the sensor near a return-- air
grille (if present) so it senses the concentration of CO2
leaving the space. The sensor should be mounted in a
location to avoid direct breath contact.
Do not mount the IAQ sensor in drafty areas such as near
supply ducts, open windows, fans, or over heat sources.
Allow at least 3 ft (0.9 m) between the sensor and any
corner. Avoid mounting the sensor where it is influenced
by the supply air; the sensor gives inaccurate readings if
the supply air is blown directly onto the sensor or if the
supply air does not have a chance to mix with the room air
before it is drawn into the return airstream.
Wiring the Indoor Air Quality Sensor —
For each sensor, use two 2-- conductor 18 AWG (American
Wire Gage) twisted-- pair cables (unshielded) to connect
the separate isolated 24 vac power source to the sensor
and to connect the sensor to the control board terminals.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 47. Connect the 4-- 20 mA terminal to
RTU-- MP J4-- 2 and connect the SIG COM terminal to
RTU-- MP J4-- 3. See Fig. 48.

COVER REMOVED

SIDE VIEW

Fig. 49 - Outdoor Air Quality Sensor Cover

C07135

Wiring the Outdoor Air CO2 Sensor — A dedicated power
supply is required for this sensor. A two-- wire cable is
required to wire the dedicated power supply for the sensor.
The two wires should be connected to the power supply
and terminals 1 and 2.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
OAQ sensor. See Fig. 47. Connect the 4 to 20 mA
terminal to RTU-- MP J4-- 5. Connect the SIG COM
terminal to RTU-- MP J4-- 6. See Fig. 50.
OAQ Sensor/RH Sensor
SEN

J4-5

COM

J4-6

24 VAC

Fig. 50 - RTU-- MP / Outdoor CO2 Sensor
(33ZCSENCO2) Connections
25

C08463

551J

C08462

Fig. 48 - RTU-- MP / Indoor CO2 Sensor
(33ZCSENCO2) Connections

j

On 551J units equipped with factory-- installed Smoke
Detector(s), the smoke detector controller implements the
unit shutdown through its NC contact set connected to the
unit’s CTB input. The FSD function is initiated via the
smoke detector’s Alarm NO contact set. The RTU-- MP
controller communicates the smoke detector’s tripped
status to the BAS building control. See Fig. 38, the
RTU-- MP System Control wiring schematic.
The
Fire
Shutdown
Switch
configuration,
identifies the
MENU→Config→Inputs→input 5,
normally open status of this input when there is no fire
alarm.

Also set MENU→Schedules→occupancy source to DI
on/off. Input 8 or 9 is recommended for easy of
installation. Refer to Fig. 36 and Table 3 for wire
terminations at J5.

Power Exhaust (output)
Connect the accessory Power Exhaust contactor coil(s) per
Fig. 51.

Power Exhaust
PEC

Connecting Discrete Inputs

551J

Filter Status
j

The filter status accessory is a field-- installed accessory.
This accessory detects plugged filters. When installing
this accessory, the unit must be configured for filter status
by setting MENU→Config→Inputs→input 3, 5, 8, or 9
to Filter Status and normally open (N/O) or normally
closed (N/C). Input 8 or 9 is recommended for easy of
installation. Refer to Fig. 36 and Fig. 38 for wire
terminations at J5.

Fan Status
The fan status accessory is a field-- installed accessory.
This accessory detects when the indoor fan is blowing air.
When installing this accessory, the unit must be
configured
for
fan
status
by
setting
MENU→Config→Inputs→input 3, 5, 8, or 9 to Fan
Status and normally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 36 and Fig. 38 for wire terminations at J5.

Remote Occupancy
The remote occupancy accessory is a field-- installed
accessory. This accessory overrides the unoccupied mode
and puts the unit in occupied mode. When installing this
accessory, the unit must be configured for remote
occupancy by setting MENU→Config→Inputs→input 3,
5, 8, or 9 to Remote Occupancy and normally open (N/O)
or normally closed (N/C).

J11-3

TAN

GRA

CTB
THERMOSTAT
C
C08464

Fig. 51 - RTU-- MP Power Exhaust Connections

Communication Wiring -- Protocols
General
Protocols are the communication languages spoken by
control devices. The main purpose of a protocol is to
communicate information in the most efficient method
possible. Different protocols exist to provide different
kinds of information for different applications. In the BAS
application, many different protocols are used, depending
on manufacturer. Protocols do not change the function of
a controller; just make the front end user different.
The RTU-- MP can be set to communicate on four different
protocols: BACnet, Modbus, N2, and LonWorks. Switch 3
(SW3) on the board is used to set protocol and baud rate.
Switches 1 and 2 (SW1 and SW2) are used to set the
board’s network address. See Fig. 52 for the switch setting
per protocol. The 3rd party connection to the RTU-- MP is
through plug J19.
NOTE: Power must be cycled after changing the SW1-- 3
switch settings.
Refer to the RTU-- MP 3rd Party Integration Guide for
more detailed information on protocols, 3rd party wiring,
and networking.

26

SW3 Protocol Selection
PROTOCOL

DS8

DS7

DS6

DS5

DS4

DS3

DS2

DS1

BACnet MS/TP
(Master)

Unused

OFF

OFF

OFF

ON

OFF

Select Baud

Select Baud

Modbus
(Slave)

Unused

OFF

OFF

ON

ON

OFF

Select Baud

Select Baud

N2
(Slave)

Unused

OFF

OFF

OFF

ON

ON

OFF

OFF

LonWorks

Unused

ON

ON

OFF

ON

OFF

OFF

OFF

NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
DS2

DS1

9600

OFF

OFF

19,200

ON

OFF

38,400

OFF

ON

76,800

ON

ON

C07166

Fig. 52 - RTU-- MP SW3 Dip Switch Settings

Local Access

Virtual BACview

BACview6 Handheld

The BACview6 is a keypad/display interface used to
connect to the RTU-- MP to access the control information,
read sensor values, and test the RTU, see Fig. 53. This is
an accessory interface that does not come with the MP
controller and can only be used at the unit. Connect the
BACview6 to the RTU-- MP’s J12 local access port. There
are 2 password protected levels in the display (User and
Admin). The user password is defaulted to 0000 but can
be changed. The Admin password is 1111 and cannot be
changed. There is a 10 minute auto logout if a screen is
idle. Contact your Bryant applications engineer for details
on navigation and screen content.

Virtual BACview is a freeware computer program that
functions as the BACview6 Handheld. The USB Link
interface (USB-- L) is required to connect a computer to
the RTU-- MP board. The link cable connects a USB port
to the J12 local access port. This program functions and
operates identical to the handheld.

RTU--MP Troubleshooting
Communication LEDs
The LEDs indicate if the controller is speaking to the
devices on the network. The LEDs should reflect
communication traffic based on the baud rate set. The
higher the baud rate the more solid the LEDs will appear.

Fig. 53 - BACview6 Handheld Connections
27

C07170

551J

Baud Rate Selections
BAUD RATE

j

Table 4 – LEDs
The LEDs on the RTU-- MP show the status of certain functions
If this LED is on...

Status is...

Power

The RTU MP has power

Rx

The RTU MP is receiving data from the network segment

Tx

The RTU MP is transmitting data over the network segment

DO#

The digital output is active

551J

The Run and Error LEDs indicate control module and network status

j

If Run LED shows...

And Error LED shows...

Status is...

2 flashes per second

Off

Normal

2 flashes per second

2 flashes,
alternating with Run LED

Five minute auto---restart delay after system error

2 flashes per second

3 flashes,
then off

Control module has just been formatted

2 flashes per second

4 flashes,
then pause

Two or more devices on this network have the
same ARC156 network address

2 flashes per second

On

Exec halted after frequent system errors or
control programs halted

5 flashes per second

On

Exec start---up aborted, Boot is running

5 flashes per second

Off

Firmware transfer in progress, Boot is running

7 flashes per second

7 flashes per second, alternating with
Run LED

Ten second recovery period after brownout

14 flashes per second

14 flashes per second,
alternating with Run LED

Brownout

On

Failure. Try the following solutions:
S
Turn the RTU ---MP off, then on.
S
Format the RTU ---MP.
S
Download memory to the RTU ---MP.
S
Replace the RTU ---MP.

On

NOTE: Contact your Bryant applications engineer for
details on configuration of RTU-- MP, operating sequences
and troubleshooting information, as well as details on
configuration and troubleshooting of connected networks.

28

P.E.

NO C.O. or UNPWR C.O.
NO P.E.

CRHEATER***

NOM
(KW)

FLA

NONE
----101A00
3.3/4.4 15.9/18.3
102A00
4.9/6.5 23.5/27.1
103B00
6.5/8.7 31.4/36.3
104B00
7.9/10.5 37.9/43.8
102A00,102A00 9.8/13.0 46.9/54.2
NONE
----101A00
3.3/4.4
9.2/10.6
102A00
4.9/6.5 13.6/15.6
103B00
6.5/8.7 18.1/20.9
104B00
7.9/10.5 21.9/25.3
105A00
12.0/16.0 33.4/38.5
NONE
----101A00
3.3/4.4
9.2/10.6
102A00
4.9/6.5 13.6/15.6
103B00
6.5/8.7 18.1/20.9
104B00
7.9/10.5 21.9/25.3
105A00
12.0/16.0 33.4/38.5
NONE
----101A00
3.3/4.4
9.2/10.6
102A00
4.9/6.5 13.6/15.6
103B00
6.5/8.7 18.1/20.9
104B00
7.9/10.5 21.9/25.3
105A00
12.0/16.0 33.4/38.5
NONE
----106A00
6.0
7.2
107A00
8.8
10.6
108A00
11.5
13.8
109A00
14.0
16.8
NONE
----106A00
6.0
7.2
107A00
8.8
10.6
108A00
11.5
13.8
109A00
14.0
16.8
NONE
----106A00
6.0
7.2
107A00
8.8
10.6
108A00
11.5
13.8
109A00
14.0
16.8

FLA

1.9

1.9

1.9

1.9

1.0

1.0

1.0

w/P.E. (pwrd fr/unit)

MCA

FUSE
or
HACR
BRKR

MCA

FUSE
or
HACR
BRKR

FLA

LRA

FLA

LRA

29.2
29.2/32.1
38.6/43.1
48.5/54.6
56.6/64.0
67.9/77.0
21.4
21.4/22.5
26.3/28.8
31.9/35.4
36.6/40.9
51.0/57.4
18.9
18.9/19.4
23.1/25.6
28.8/32.3
33.5/37.8
47.9/54.3
19.2
19.2/19.8
23.5/26.0
29.1/32.6
33.9/38.1
48.3/54.6
11.8
14.0
18.3
22.3
26.0
9.9
11.6
15.9
19.9
23.6
10.4
12.3
16.5
20.5
24.3

45
45/45
45/45
50/60
60/70
70/80
30
30/30
30/30
35/40
40/45
60/60
25
25/25
25/30
30/35
35/40
50/60
25
25/25
25/30
30/35
35/40
50/60
15
15
20
25
30
15
15
20
20
25
15
15
20
25
25

29
29/30
36/40
45/50
52/59
62/71
22
22/22
24/26
29/33
34/38
47/53
19
19/19
21/24
26/30
31/35
44/50
19
19/19
22/24
27/30
31/35
44/50
12
13
17
20
24
10
11
15
18
22
10
11
15
19
22

88
88/88
88/88
88/88
88/88
88/88
82
82/82
82/82
82/82
82/82
82/82
87
87/87
87/87
87/87
87/87
87/87
105
105/105
105/105
105/105
105/105
105/105
43
43
43
43
43
45
45
45
45
45
54
54
54
54
54

31.1
31.5/34.5
41.0/45.5
50.9/57.0
59.0/66.4
70.3/79.4
23.2
23.3/24.9
28.6/31.1
34.3/37.8
39.0/43.3
53.4/59.8
20.8
20.8/21.8
25.5/28.0
31.1/34.6
35.9/40.1
50.3/56.6
21.1
21.1/22.1
25.9/28.4
31.5/35.0
36.3/40.5
50.6/57.0
12.8
15.3
19.5
23.5
27.3
10.9
12.9
17.1
21.1
24.9
11.4
13.5
17.8
21.8
25.5

45
45/45
45/45
60/60
60/70
80/80
30
30/30
30/35
35/40
40/45
60/60
30
30/30
30/30
35/35
40/45
60/60
30
30/30
30/30
35/40
40/45
60/60
15
20
20
25
30
15
15
20
25
25
15
15
20
25
30

31
31/32
38/42
47/52
54/61
65/73
24
24/24
26/29
32/35
36/40
49/55
21
21/21
23/26
29/32
33/37
46/52
21
21/21
24/26
29/32
33/37
47/52
13
14
18
22
25
11
12
16
19
23
11
12
16
20
23

90
90/90
90/90
90/90
90/90
90/90
84
84/84
84/84
84/84
84/84
84/84
89
89/89
89/89
89/89
89/89
89/89
107
107/107
107/107
107/107
107/107
107/107
44
44
44
44
44
46
46
46
46
46
55
55
55
55
55

DISC. SIZE

DISC. SIZE

NONE

---

---

1.9

9.3

15

10

42

11.2

15

12

44

NONE

---

---

1.9

7.2

15

7

43

9.1

15

9

45

NONE

---

---

1.9

7.3

15

7

49

9.2

15

9

51

See “Legend and Notes for Table 5” on page 35.

29

551J

IFM TYPE
MED
MED
HIGH MED DD---STD

575---3---60

HIGH

460---3---60

DD---STD

551J*04

HIGH

208/230---3---60

DD---STD

DD---STD

NO M. V ---Ph---HZ
208/230---1---60

UNIT

Table 5 Unit Wire/Fuse or HACR Breaker Sizing Data
ELEC. HTR

j

IFM TYPE
DD---STD

DD---STD

NO M. V ---Ph---HZ

MED
MED
HIGH MED DD---STD

HIGH

460---3---60

DD---STD

551J*04

HIGH

208/230---3---60

j

575---3---60

551J

208/230---1---60

UNIT

Table 5 Unit Wire/Fuse or HACR Breaker Sizing Data (cont)
ELEC. HTR

P.E.

w/ PWRD C.O.
NO P.E.

CRHEATER***

NOM
(KW)

FLA

NONE
----101A00
3.3/4.4 15.9/18.3
102A00
4.9/6.5 23.5/27.1
103B00
6.5/8.7 31.4/36.3
104B00
7.9/10.5 37.9/43.8
102A00,102A00 9.8/13.0 46.9/54.2
NONE
----101A00
3.3/4.4
9.2/10.6
102A00
4.9/6.5 13.6/15.6
103B00
6.5/8.7 18.1/20.9
104B00
7.9/10.5 21.9/25.3
105A00
12.0/16.0 33.4/38.5
NONE
----101A00
3.3/4.4
9.2/10.6
102A00
4.9/6.5 13.6/15.6
103B00
6.5/8.7 18.1/20.9
104B00
7.9/10.5 21.9/25.3
105A00
12.0/16.0 33.4/38.5
NONE
----101A00
3.3/4.4
9.2/10.6
102A00
4.9/6.5 13.6/15.6
103B00
6.5/8.7 18.1/20.9
104B00
7.9/10.5 21.9/25.3
105A00
12.0/16.0 33.4/38.5
NONE
----106A00
6.0
7.2
107A00
8.8
10.6
108A00
11.5
13.8
109A00
14.0
16.8
NONE
----106A00
6.0
7.2
107A00
8.8
10.6
108A00
11.5
13.8
109A00
14.0
16.8
NONE
----106A00
6.0
7.2
107A00
8.8
10.6
108A00
11.5
13.8
109A00
14.0
16.8

FLA

1.9

1.9

1.9

1.9

1.0

1.0

1.0

w/P.E. (pwrd fr/unit)

MCA

FUSE
or
HACR
BRKR

MCA

FUSE
or
HACR
BRKR

FLA

LRA

FLA

LRA

34.0
35.1/38.1
44.6/49.1
54.5/60.6
62.6/70.0
73.9/83.0
26.2
26.8/28.5
32.3/34.8
37.9/41.4
42.6/46.9
57.0/63.4
23.7
23.7/25.4
29.1/31.6
34.8/38.3
39.5/43.8
53.9/60.3
24.0
24.0/25.8
29.5/32.0
35.1/38.6
39.9/44.1
54.3/60.6
14.0
16.8
21.0
25.0
28.8
12.1
14.4
18.6
22.6
26.4
12.6
15.0
19.3
23.3
27.0

50
50/50
50/50
60/70
70/80
80/90
30
30/30
35/35
40/45
45/50
60/70
30
30/30
30/35
35/40
40/45
60/70
30
30/30
30/35
40/40
40/45
60/70
20
20
25
25
30
15
15
20
25
30
15
15
20
25
30

34
34/35
41/45
50/56
58/64
68/76
27
27/27
30/32
35/38
39/43
52/58
24
24/24
27/29
32/35
36/40
50/55
25
25/25
27/29
32/36
37/41
50/56
14
15
19
23
26
12
13
17
21
24
13
14
18
21
25

93
93/93
93/93
93/93
93/93
93/93
87
87/87
87/87
87/87
87/87
87/87
92
92/92
92/92
92/92
92/92
92/92
110
110/110
110/110
110/110
110/110
110/110
45
45
45
45
45
47
47
47
47
47
56
56
56
56
56

35.9
37.5/40.5
47.0/51.5
56.9/63.0
65.0/72.4
76.3/85.4
28.1
29.1/30.9
34.6/37.1
40.3/43.8
45.0/49.3
59.4/65.8
25.6
26.0/27.8
31.5/34.0
37.1/40.6
41.9/46.1
56.3/62.6
25.9
26.4/28.1
31.9/34.4
37.5/41.0
42.3/46.5
56.6/63.0
15.0
18.0
22.3
26.3
30.0
13.1
15.6
19.9
23.9
27.6
13.6
16.3
20.5
24.5
28.3

50
50/50
50/60
60/70
70/80
80/90
35
35/35
35/40
45/45
50/50
60/70
30
30/30
35/35
40/45
45/50
60/70
30
30/30
35/35
40/45
45/50
60/70
20
20
25
30
30
15
20
20
25
30
20
20
25
25
30

36
36/37
43/47
52/58
60/67
70/79
29
29/29
32/34
37/40
41/45
50/60
26
26/26
29/31
34/37
39/42
52/58
27
27/27
29/32
35/38
39/43
52/58
16
17
20
24
28
13
14
18
22
25
14
15
19
23
26

95
95/95
95/95
95/95
95/95
95/95
89
89/89
89/89
89/89
89/89
89/89
94
94/94
94/94
94/94
94/94
94/94
112
112/112
112/112
112/112
112/112
112/112
46
46
46
46
46
48
48
48
48
48
57
57
57
57
57

DISC. SIZE

DISC. SIZE

NONE

---

---

1.9

11.0

15

12

44

12.9

15

14

46

NONE

---

---

1.9

8.9

15

9

45

10.8

15

11

47

NONE

---

---

1.9

9.0

15

9

51

10.9

15

11

53

See “Legend and Notes for Table 5” on page 35.

30

P.E.

NO C.O. or UNPWR C.O.
NO P.E.

CRHEATER***

NOM
(KW)

FLA

FLA

MCA

FUSE
or
HACR
BRKR

w/P.E. (pwrd fr/unit)
DISC. SIZE
FLA

LRA

MCA

FUSE
or
HACR
BRKR

FLA

LRA

37
37/37
47/52
65/73
83/94
98/111
28
28/29
32/35
49/55
61/69
25
25/26
29/32
46/52
58/66
26
26/26
29/32
47/52
59/66
14
14
22
25
38
12
12
19
23
35
12
12
20
23
36

129
129/129
129/129
129/129
129/129
129/129
95
95/95
95/95
95/95
95/95
100
100/100
100/100
100/100
100/100
118
118/118
118/118
118/118
118/118
48
48
48
48
48
50
50
50
50
50
59
59
59
59
59

NONE
101A00
103B00
102A00,102A00
103B00,103B00
104B00,104B00
NONE
102A00
103B00
105A00
104B00,104B00
NONE
102A00
103B00
105A00
104B00,104B00
NONE
102A00
103B00
105A00
104B00,104B00
NONE
106A00
108A00
109A00
108A00,108A00
NONE
106A00
108A00
109A00
108A00,108A00
NONE
016A00
108A00
109A00
108A00,108A00

--3.3/4.4
6.5/8.7
9.8/13.0
13.1/17.4
15.8/21.0
--4.9/6.5
6.5/8.7
12.0/16.0
15.8/21.0
--4.9/6.5
6.5/8.7
12.0/16.0
15.8/21.0
--4.9/6.5
6.5/8.7
12.0/16.0
15.8/21.0
--6.0
11.5
14.0
23.0
--6.0
11.5
14.0
23.0
--6.0
11.5
14.0
23.0

--15.9/18.3
31.4/36.3
46.9/54.2
62.8/72.5
75.8/87.5
--13.6/15.6
18.1/20.9
33.4/38.5
43.8/50.5
--13.6/15.6
18.1/20.9
33.4/38.5
43.8/50.5
--13.6/15.6
18.1/20.9
33.4/38.5
43.8/50.5
--7.2
13.8
16.8
27.7
--7.2
13.8
16.8
27.7
--7.2
13.8
16.8
27.7

NONE

---

---

1.9

10.9

15

11

43

12.8

15

13

45

NONE

---

---

1.9

8.8

15

9

44

10.7

15

11

46

NONE

---

---

1.9

8.9

15

9

50

10.8

15

11

52

1.9

1.9

1.9

1.9

1.0

1.0

1.0

36.1
50
35
127
38.0
50
36.1/36.1
50/50
35/35 127/127 38.0/38.0
50/50
48.5/54.6
50/60
45/50 127/127 50.9/57.0
60/60
67.9/77.0
70/80
62/71 127/127 70.3/79.4
80/80
87.8/99.9
90/100 81/92 127/127 90.1/102.3 100/110
104.0/118.6 110/125 96/109 127/127 106.4/121.0 110/125
25.9
30
26
93
27.8
40
26.3/28.8
30/30
26/26
93/93
28.6/31.1
40/40
31.9/35.4
35/40
29/33
93/93
34.3/37.8
40/40
51.0/57.4
60/60
47/53
93/93
53.4/59.8
60/60
64.0/72.4
70/80
59/67
93/93
66.4/74.8
70/80
23.4
30
23
98
25.3
30
23.4/25.6
30/30
23/24
98/98
25.5/28.0
30/30
28.8/32.3
30/35
26/30
98/98
31.1/34.6
35/35
47.9/54.3
50/60
44/50
98/98
50.3/56.6
60/60
60.9/69.3
70/70
56/64
98/98
63.3/71.6
70/80
23.7
30
23
116
25.6
30
23.7/26.0
30/30
23/24 116/116 25.9/28.4
30/30
29.1/32.6
30/35
27/30 116/116 31.5/35.0
35/40
48.3/54.6
50/60
44/50 1116/16 50.6/57.0
60/60
61.3/69.6
70/70
56/64 116/116 63.6/72.0
70/80
12.7
15
13
47
13.7
20
14.0
15
13
47
15.3
20
22.3
25
20
47
23.5
25
26.0
30
24
47
27.3
30
39.6
40
36
47
40.9
45
10.8
15
11
49
11.8
15
11.6
15
11
49
12.9
15
19.9
20
18
49
21.1
25
23.6
25
22
49
24.9
25
37.3
40
34
49
38.5
40
11.3
15
11
58
12.3
15
12.3
15
11
58
13.5
15
20.5
25
19
58
21.8
25
24.3
25
22
58
25.5
30
37.9
40
35
58
39.1
40

DISC. SIZE

See “Legend and Notes for Table 5” on page 35.

31

551J

NO M. V ---Ph---HZ

IFM TYPE
DD---STD
MED
MED
HIGH MED DD---STD

575---3---60

HIGH

460---3---60

DD---STD

551J*05

HIGH

208/230---3---60

DD---STD

208/230---1---60

UNIT

Table 5 Unit Wire/Fuse or HACR Breaker Sizing Data (cont)
ELEC. HTR

j

NO M. V ---Ph---HZ

IFM TYPE
DD---STD
MED
HIGH

208/230---3---60

j

MED
HIGH MED DD---STD

575---3---60

HIGH

460---3---60

DD---STD

551J*05

551J

DD---STD

208/230---1---60

UNIT

Table 5 Unit Wire/Fuse or HACR Breaker Sizing Data (cont)
ELEC. HTR

P.E.

w/PWRD C.O.
NO P.E.

CRHEATER***

NOM
(KW)

FLA

FLA

MCA

FUSE
or
HACR
BRKR

w/P.E. (pwrd fr/unit)
DISC. SIZE
FLA

LRA

MCA

FUSE
or
HACR
BRKR

DISC. SIZE
FLA

LRA

NONE
101A00
103B00
102A00,102A00
103B00,103B00
104B00,104B00
NONE
102A00
103B00
105A00
104B00,104B00
NONE
102A00
103B00
105A00
104B00,104B00
NONE
102A00
103B00
105A00
104B00,104B00
NONE
106A00
108A00
109A00
108A00,108A00
NONE
106A00
108A00
109A00
108A00,108A00
NONE
016A00
108A00
109A00
108A00,108A00

--3.3/4.4
6.5/8.7
9.8/13.0
13.1/17.4
15.8/21.0
--4.9/6.5
6.5/8.7
12.0/16.0
15.8/21.0
--4.9/6.5
6.5/8.7
12.0/16.0
15.8/21.0
--4.9/6.5
6.5/8.7
12.0/16.0
15.8/21.0
--6.0
11.5
14.0
23.0
--6.0
11.5
14.0
23.0
--6.0
11.5
14.0
23.0

--15.9/18.3
31.4/36.3
46.9/54.2
62.8/72.5
75.8/87.5
--13.6/15.6
18.1/20.9
33.4/38.5
43.8/50.5
--13.6/15.6
18.1/20.9
33.4/38.5
43.8/50.5
--13.6/15.6
18.1/20.9
33.4/38.5
43.8/50.5
--7.2
13.8
16.8
27.7
--7.2
13.8
16.8
27.7
--7.2
13.8
16.8
27.7

NONE

---

---

1.9

12.6

15

13

45

14.5

20

15

47

NONE

---

---

1.9

10.5

15

11

46

12.4

15

13

48

NONE

---

---

1.9

10.6

15

11

52

12.5

15

13

54

1.9

1.9

1.9

1.9

1.0

1.0

1.0

40.9
60
41
132
42.8
60
43
134
40.9/40.9
60/60
41/41 132/132 42.8/42.8
60/60
43/43 134/134
54.5/60.6
60/70
50/56 132/132 56.9/63.0
60/70
52/58 134/134
73.9/83.0
80/90
68/76 132/132 76.3/85.4
80/90
70/79 134/134
93.8/105.9 100/110 86/97 132/132 96.1/108.3 100/110 88/100 134/134
110.0/124.6 125/125 101/115 132/132 112.4/127.0 125/150 103/117 134/134
30.7
40
31
98
32.6
45
34
100
32.3/34.8
40/40
31/32
98/98
34.6/37.1
45/45
34/34 100/100
37.9/41.4
40/45
35/38
98/98
40.3/43.8
45/45
37/40 100/100
57.0/63.4
60/70
52/58
98/98
59.4/65.8
60/70
55/60 100/100
70.0/78.4
80/80
64/72
98/98
72.4/80.8
80/90
67/74 100/100
28.2
40
29
103
30.1
40
31
105
29.1/31.6
40/40
29/29 103/103 31.5/34.0
40/40
31/31 105/105
34.8/38.3
40/40
32/35 103/103 37.1/40.6
40/45
34/37 105/105
53.9/60.3
60/70
50/55 103/103 56.3/62.6
60/70
52/58 105/105
66.9/75.3
70/80
62/69 103/103 69.3/77.6
70/80
64/71 105/105
28.5
40
29
121
30.4
40
31
123
29.5/32.0
40/40
29/29 121/121 31.9/34.4
40/40
31/32 123/123
35.1/38.6
40/40
32/36 121/121 37.5/41.0
40/45
35/38 123/123
54.3/60.6
60/70
50/56 121/121 56.6/63.0
60/70
52/58 123/123
67.3/75.6
70/80
62/70 121/121 69.6/78.0
70/80
64/72 123/123
14.9
20
15
49
15.9
20
16
50
16.8
20
15
49
18.0
20
17
50
25.0
25
23
49
26.3
30
24
50
28.8
30
26
49
30.0
30
28
50
42.4
45
39
49
43.6
45
40
50
13.0
15
13
51
14.0
20
14
52
14.4
15
13
51
15.6
20
14
52
22.6
25
21
51
23.9
25
22
52
26.4
30
24
51
27.6
30
25
52
40.0
45
37
51
41.3
45
38
52
13.5
20
14
60
14.5
20
15
61
15.0
20
14
60
16.3
20
15
61
23.3
25
21
60
24.5
25
23
61
27.0
30
25
60
28.3
30
26
61
40.6
45
37
60
41.9
45
39
61

See “Legend and Notes for Table 5” on page 35.

32

P.E.

NO C.O. or UNPWR C.O.
NO P.E.

CRHEATER***

NOM
(KW)

FLA

FLA

MCA

FUSE
or
HACR
BRKR

w/P.E. (pwrd fr/unit)
DISC. SIZE
FLA

LRA

MCA

FUSE
or
HACR
BRKR

FLA

LRA

41
41/42
47/52
65/73
83/94
98/111
31
31/31
36/40
49/55
61/69
74/84
28
28/28
33/37
47/52
59/66
72/82
31
31/31
36/40
49/55
61/69
74/84
15
15
22
25
38
41
13
13
20
23
36
39
14
14
21
24
37
40

146
146/146
146/146
146/146
146/146
146/146
122
122/122
1/22122
122/122
122/122
122/122
145
145/145
145/145
145/145
145/145
145/145
171
171/171
171/171
171/171
171/171
171/171
59
59
59
59
59
59
70
70
70
70
70
70
83
83
83
83
83
83

NONE
102A00
103B00
102A00,102A00
103B00,103B00
104B00,104B00
NONE
102A00
104B00
105A00
104B00,104B00
104B00,105A00
NONE
102A00
104B00
105A00
104B00,104B00
104B00,105A00
NONE
102A00
104B00
105A00
104B00,104B00
104B00,104A00
NONE
106A00
108A00
109A00
108A00,108A00
108A00,109A00
NONE
106A00
108A00
109A00
108A00,108A00
108A00,109A00
NONE
016A00
108A00
109A00
108A00,108A00
108A00,109A00

--4.9/6.5
6.5/8.7
9.8/13.0
13.1/17.4
15.8/21.0
--4.9/6.5
7.9/10.5
12.0/16.0
15.8/21.0
19.9/26.5
--4.9/6.5
7.9/10.5
12.0/16.0
15.8/21.0
19.9/26.5
--4.9/6.5
7.9/10.5
12.0/16.0
15.8/21.0
19.9/26.5
--6.0
11.5
14.0
23.0
25.5
--6.0
11.5
14.0
23.0
25.5
--6.0
11.5
14.0
23.0
25.5

--23.5/27.1
31.4/36.3
46.9/54.2
62.8/72.5
75.8/87.5
--13.6/15.6
21.9/25.3
33.4/38.5
43.8/50.5
55.2/63.8
--13.6/15.6
21.9/25.3
33.4/38.5
43.8/50.5
55.2/63.8
--13.6/15.6
21.9/25.3
33.4/38.5
43.8/50.5
55.2/63.8
--7.2
13.8
16.8
27.7
30.7
--7.2
13.8
16.8
27.7
30.7
--7.2
13.8
16.8
27.7
30.7

NONE

---

---

1.9

11.3

15

12

46

13.2

15

14

48

NONE

---

---

1.9

9.3

15

9

53

11.2

15

11

55

NONE

---

---

1.9

10.1

15

10

64

12.0

15

12

66

1.9

1.9

1.9

1.9

1.0

1.0

1.0

40.1
60
39
144
42.0
60
40.1/43.1
60/60
39/40 144/144 42.0/45.5
60/60
48.5/54.6
60/60
45/50 144/144 50.9/57.0
60/60
67.9/77.0
70/80
62/71 144/144 70.3/79.4
80/80
87.8/99.9
90/100 81/92 144/144 90.1/102.3 100/110
104.0/118.6 110/125 96/109 144/144 106.4/121.0 110/125
28.7
40
28
120
30.6
45
28.7/28.8
40/40
28/28 120/120 30.6/31.1
45/45
36.6/40.9
40/45
34/38 120/120 39.0/43.3
45/45
51.0/57.4
60/60
47/53 120/120 53.4/59.8
60/60
64.0/72.4
70/80
59/67 120/120 66.4/74.8
70/80
78.3/89.0
80/90
72/82 120/120 80.6/91.4
90/100
26.5
40
26
143
28.4
40
26.5/26.5
40/40
26/26 143/143 28.4/28.4
40/40
33.9/38.1
40/40
31/35 143/143 36.3/40.5
40/45
48.3/54.6
50/60
44/50 143/143 50.6/57.0
60/60
61.3/69.6
70/70
56/64 143/143 63.6/72.0
70/80
75.5/86.3
80/90
69/79 143/143 77.9/88.6
80/90
28.8
40
29
169
30.7
45
28.8/28.9
40/40
29/29 169/169 30.7/31.3
45/45
36.8/41.0
40/45
34/38 169/169 39.1/43.4
45/45
51.1/57.5
60/60
47/53 169/169 53.5/59.9
60/60
64.1/72.5
70/80
59/67 169/169 66.5/74.9
70/80
78.4/89.1
80/90
72/82 169/169 80.8/91.5
90/100
13.7
20
14
58
14.7
20
14.0
20
14
58
15.3
20
22.3
25
20
58
23.5
25
26.0
30
24
58
27.3
30
39.6
40
36
58
40.9
45
43.4
45
40
58
44.6
45
12.3
15
12
69
13.3
20
12.3
15
12
69
13.5
20
20.5
25
19
69
21.8
25
24.3
25
22
69
25.5
30
37.9
40
35
69
39.1
40
41.6
45
38
69
42.9
45
13.1
20
13
82
14.1
20
13.3
20
13
82
14.5
20
21.5
25
20
82
22.8
25
25.3
30
23
82
26.5
30
38.9
40
36
82
40.1
45
42.6
45
39
82
43.9
45

DISC. SIZE

See “Legend and Notes for Table 5” on page 35.

33

551J

NO M. V ---Ph---HZ

IFM TYPE
DD---STD
MED
MED
HIGH MED DD---STD

575---3---60

HIGH

460---3---60

DD---STD

551J*06

HIGH

208/230---3---60

DD---STD

208/230---1---60

UNIT

Table 5 Unit Wire/Fuse or HACR Breaker Sizing Data (cont)
ELEC. HTR

j

NO M. V ---Ph---HZ

IFM TYPE
DD---STD
DD---STD
MED
HIGH

208/230---3---60

j

MED
HIGH MED DD---STD

575---3---60

HIGH

460---3---60

DD---STD

551J*06

551J

208/230---1---60

UNIT

Table 5 Unit Wire/Fuse or HACR Breaker Sizing Data (cont)
ELEC. HTR

P.E.

w/ PWRD C.O.
NO P.E.

CRHEATER***

NOM
(KW)

FLA

FLA

MCA

FUSE
or
HACR
BRKR

w/P.E. (pwrd fr/unit)
DISC. SIZE
FLA

LRA

MCA

FUSE
or
HACR
BRKR

DISC. SIZE
FLA

LRA

NONE
102A00
103B00
102A00,102A00
103B00,103B00
104B00,104B00
NONE
102A00
104B00
105A00
104B00,104B00
104B00,105A00
NONE
102A00
104B00
105A00
104B00,104B00
104B00,105A00
NONE
102A00
104B00
105A00
104B00,104B00
104B00,104A00
NONE
106A00
108A00
109A00
108A00,108A00
108A00,109A00
NONE
106A00
108A00
109A00
108A00,108A00
108A00,109A00
NONE
016A00
108A00
109A00
108A00,108A00
108A00,109A00

--4.9/6.5
6.5/8.7
9.8/13.0
13.1/17.4
15.8/21.0
--4.9/6.5
7.9/10.5
12.0/16.0
15.8/21.0
19.9/26.5
--4.9/6.5
7.9/10.5
12.0/16.0
15.8/21.0
19.9/26.5
--4.9/6.5
7.9/10.5
12.0/16.0
15.8/21.0
19.9/26.5
--6.0
11.5
14.0
23.0
25.5
--6.0
11.5
14.0
23.0
25.5
--6.0
11.5
14.0
23.0
25.5

--23.5/27.1
31.4/36.3
46.9/54.2
62.8/72.5
75.8/87.5
--13.6/15.6
21.9/25.3
33.4/38.5
43.8/50.5
55.2/63.8
--13.6/15.6
21.9/25.3
33.4/38.5
43.8/50.5
55.2/63.8
--13.6/15.6
21.9/25.3
33.4/38.5
43.8/50.5
55.2/63.8
--7.2
13.8
16.8
27.7
30.7
--7.2
13.8
16.8
27.7
30.7
--7.2
13.8
16.8
27.7
30.7

NONE

---

---

1.9

13.0

15

13

48

14.9

20

16

50

NONE

---

---

1.9

11.0

15

11

55

12.9

15

13

57

NONE

---

---

1.9

11.8

15

12

66

13.7

15

14

68

1.9

1.9

1.9

1.9

1.0

1.0

1.0

44.9
60
44
149
46.8
60
47
151
44.9/49.1
60/60
44/45 149/149 47.0/51.5
60/60
47/47 151/151
54.5/60.6
60/70
50/56 149/149 56.9/63.0
60/70
52/58 151/151
73.9/83.0
80/90
68/76 149/149 76.3/85.4
80/90
70/79 151/151
93.8/105.9 100/110 86/97 149/149 96.1/108.3 100/110 88/100 151/151
110.0/124.6 125/125 101/115 149/149 112.4/127.0 125/150 103/117 151/151
33.5
45
34
125
35.4
50
36
127
33.5/34.8
45/45
34/34 125/125 35.4/37.1
50/50
36/36 127/127
42.6/46.9
45/50
39/43 125/125 45.0/49.3
50/50
41/45 127/127
57.0/63.4
60/70
52/58 125/125 59.4/65.8
60/70
55/60 127/127
70.0/78.4
80/80
64/72 125/125 72.4/80.8
80/90
67/74 127/127
84.3/95.0
90/100
78/87 125/125 86.6/97.4
90/100
80/90 127/127
31.3
45
31
148
33.2
45
34
150
31.3/32.0
45/45
31/31 148/148 33.2/34.4
45/45
34/34 150/150
39.9/44.1
45/45
37/41 148/148 42.3/46.5
45/50
39/43 150/150
54.3/60.6
60/70
50/56 148/148 56.6/63.0
60/70
52/58 150/150
67.3/75.6
70/80
62/70 148/148 69.6/78.0
70/80
64/72 150/150
81.5/92.3
90/100
75/85 148/148 83.9/94.6
90/100
77/87 150/150
33.6
45
34
174
35.5
50
36
176
33.6/34.9
45/45
34/34 174/174 35.5/37.3
50/50
36/36 176/176
42.8/47.0
45/50
39/43 174/174 45.1/49.4
50/50
42/45 176/176
57.1/63.5
60/70
53/58 174/174 59.5/65.9
60/70
55/61 176/176
70.1/78.5
80/80
65/72 174/174 72.5/80.9
80/90
67/74 176/176
84.4/95.1
90/100
78/88 174/174 86.8/97.5
90/100
80/90 176/176
15.9
20
16
60
16.9
20
17
61
16.8
20
16
60
18.0
20
17
61
25.0
25
23
60
26.3
30
24
61
28.8
30
26
60
30.0
30
28
61
42.4
45
39
60
43.6
45
40
61
46.1
50
42
60
47.4
50
44
61
14.5
20
15
71
15.5
20
16
72
15.0
20
15
71
16.3
20
16
72
23.3
25
21
71
24.5
25
23
72
27.0
30
25
71
28.3
30
26
72
40.6
45
37
71
41.9
45
39
72
44.4
45
41
71
45.6
50
42
72
15.3
20
16
84
16.3
20
17
85
16.0
20
16
84
17.3
20
17
85
24.3
25
22
84
25.5
30
23
85
28.0
30
26
84
29.3
30
27
85
41.6
45
38
84
42.9
45
39
85
45.4
50
42
84
46.6
50
43
85

See “Legend and Notes for Table 5” on page 35.

34

Legend and Notes for Table 5

Example: Supply voltage is 230-3-60

--- Circuit breaker
--- Convenient outlet
--- Direct drive
indoor fan motor
--- Disconnect
--- Full load amps
--- Indoor fan motor
--- Locked rotor amps
--- Minimum circuit amps
--- Power exhaust
--- Powered convenient outlet
--- Unpowered convenient outlet

AB = 224 v
BC = 231 v
AC = 226 v

DISC
FLA
IFM
LRA
MCA
PE
PWRD CO
UNPWR CO
NOTES:
1. In compliance with NEC requirements for multimotor and
combination load equipment (refer to NEC Articles 430 and
440), the overcurrent protective device for the unit shall be
fuse or HACR breaker. Canadian units may be fuse or circuit
breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply
voltage is greater than 2%. Use the following formula to determine the percentage of voltage imbalance.
% Voltage Imbalance

= 100 x

Average Voltage =
=

(224 + 231 + 226)
3

=

681
3

227

Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3 v . . . . . . . . . . Maximum deviation is 4 v.
(BC) 231 – 227 = 4 v . . . . . . . . . . Determine percent of voltage imbalance.
% Voltage Imbalance

= 100 x

4
227

= 1.76%

This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

551J

LEGEND:
BRKR
CO
DD

max voltage deviation from average voltage
average voltage

Fig. 54 - EconoMi$er IV Wiring

C09302

Step 11 — Adjust Factory--Installed Options

EconoMi$er IV Occupancy Switch —

Smoke Detectors —

Refer to Fig. 56 for general EconoMi$er IV wiring.
External occupancy control is managed through a
connection on the Controls Connections Board.

Smoke detector(s) will be connected at the Controls
Connections Board, at terminals marked “Smoke
Shutdown”. Cut jumper JMP 3 when ready to energize
unit.

If external occupancy control is desired, connect a time
clock or remotely controlled switch (closed for Occupied,
open for Unoccupied sequence) at terminals marked
OCCUPANCY. Cut jumper JMP 2 to complete the
installation.
35

j

Step 12 — Install Accessories

551J

Available accessories include:

j

Curb
Thru-- base connection kit (must be installed before unit
is set on curb)
Electric heaters and single-- poing connection kits
Manual outside air damper
Two-- Position motorized outside air damper
EconoMi$er IV (with control)
EconoMi$er2 (without control/for external signal)
Power Exhaust
Differential dry-- bulb sensor (EconoMi$er IV)
Outdoor enthalpy sensor
Differential enthalpy sensor
CO2 sensor
Smoke detector (Return Air and/or Supply Air)
Louvered hail guard
Hood-- type hail guard
Phase monitor control
Refer to separate installation instructions for information
on installing these accessories.

Pre-- Start and Start-- Up —
This completes the mechanical installation of the unit.
Refer to the unit’s Service Manual for detailed Pre-- Start
and Start-- Up instructions.

Copyright 2010 Bryant Heating & Cooling Sysemts D 7310 W. Morris St. D Indianapolis, IN 46231

Printed in U.S.A.

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

36

Edition Date: 01/10

Catalog No: II551J---02
Replaces: New



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