Bryant 548J-14D User Manual

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548J*14D SINGLE PACKAGE ROOFTOP HEAT PUMP WITH WITH PURONR(R--410A) REFRIGERANT SIZE 14

Installation Instructions

NOTE: Read the entire instruction manual before starting

the installation.

TABLE OF CONTENTS

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

INSTALLATION 4...............................

Jobsite Survey 4................................

Step 1 -- Plan for Unit Location 4..................

Roof Mount 5...............................

Step 2 -- Plan for Sequence of Unit Installation 5......

Curb--Mount Installation 5.....................

Pad--Mount Installation 5......................

Frame--Mount Installation 5....................

Step 3 -- Inspect Unit 5...........................

Step 4 -- Provide Unit Support 5...................

Roof Curb Mount 5..........................

Slab Mount (Horizontal Units Only) 5...........

Alternate Unit Support 5......................

Step 5 -- Field Fabricate Ductwork 7................

For Units with Accessory Electric Heaters 7......

Step 6 -- Rig and Place Unit 7.....................

Step 7 -- Convert to Horizontal & Connect Ductwork 8.

Step 8 -- Install Outside Air Hood 8................

Economizer Hood Removal and Setup 8.........

Two Position Damper Hood Removal and Setup 9..

Economizer Hood and Two--Position Hood 10.....

Step 9 -- Install External Condensate Trap and Line 10.

Step 10 -- Make Electrical Connections 11...........

Field Power Supply 11........................

Units without Factory--Installed Disconnect 13....

Units with Factory--Installed Disconnect 13.......

Convenience Outlets 13.......................

Factory--Option Thru--Base Connections 15.......

Units without Thru--Base Connections 15.........

Field Control Wiring 15.......................

Thermostat 15...............................

Unit without Thru--Base Conversion Kit 16.......

Heat Anticipator Settings 16...................

Electric Heaters 16..............................

Single Point Boxes 17..........................

Heater Low--Voltage Control Connections 17......

Outdoor Air Enthalpy Control 18.................

Differential Enthalpy Control 18................

Return Air Enthalpy Sensor 18.................

RTU--MP Control System 19......................

Supply Air Temperature (SAT) Sensor 21.........

Outdoor Air Temperature (OAT) Sensor 22.......

EconoMi$er2 22.............................

Field Connections 22..........................

Space Temperature (SPT) Sensors 22............

Economizer Controls 23......................

Indoor Air Quality (CO

Outdoor Air Quality Sensor 24.................

Connecting Discrete Inputs 24..................

Communication Wiring -- Protocols 25............

General 25.................................

Local Access 25.............................

RTU--MP Troubleshooting 25..................

Smoke Detectors 27.............................

System 27..................................

Controller 27...............................

Sensor 27..................................

Smoke Detector Locations 28....................

Supply Air 28...............................

Return Air without Economizer 28..............

Return Air with Economizer 28.................

Step 11 -- Adjust Factory--Installed Options 32........

Step 12 -- Install Accessories 33...................

)Sensor 23.............

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.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lockout tag. Unit may have more than one power switch.

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.

548J*14D

It is important to recognize safety information. This is 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.

. When you see this symbol on the

WARNING

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.

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.

Wear safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.

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 heat pump units.

Vertical Connections / Economizer

548J*14D

Horizontal Connections / Economizer

Fig. 1 -- Unit Dimensional Drawing – Size 14 Unit

C09895

548J*14D

Fig. 1 -- Unit Dimensional Drawing – Size 14 Unit (cont.)

INSTALLATION

Jobsite Survey

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 at least the minimum clearances required for safety. This includes the clearance to combustible surfaces, unit performance and service access below, around and above unit as specified in unit drawings. See Fig. 2.

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. Do not install unit in an indoor location. Do not locate air

inlets near exhaust vents , relief valves, or other sources of contaminated air.

C10364

18” (457)

42" (1067)

Required bottom condensate drain connection.

Otherwise, 36” (914mm) for condensate connection.

42" (1067)

C09897

Fig. 2 -- Service Clearance Dimensional Drawing

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 for removal and disposal of frost and ice that will form during the heating--defrost mode as well as allow installation of condensate trap per requirements. RefertoStep9—InstallExternalCondensate Trap and Line – for required trap dimensions.

Roof Mount —

Check building codes for weight distribution requirements. Unit operating weight is shown in Table 1.

Table 1 – Operating Weights

548J*14D UNITS LB (KG)

Component 14D

Base Unit 1370 (620)

Economizer

Vertical 100 (45)

Horizontal 115 (52)

Powered Outlet 32 (15)

Curb

14--- in/356 mm 180 (82)

24--- in/610 mm 235 (107)

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

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

Frame--mounted installation —

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

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.

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. 5. Improperly applied gasket can also result in air leaks and poor unit performance.

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.

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.

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.

548J*14D

Fig. 3 -- Roof Curb Details

C10365

CAUTION

MAXIMUM ALLOWABLE

DIFFERENCE IN. (MM)

A-B

0.5” (13)

B-C

1.0” (25)

A-C

1.0” (25)

C10001

Fig. 4 -- Unit Leveling Tolerances

Step 5 — Field Fabricate Ductwork

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. For vertical ducted applications, secure all ducts to roof curb

and building structure. Do not connect ductwork to unit.

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.

For Units with Accessory Electric Heaters —

All installations require a minimum clearance to combustible surfaces of 1--in (25 mm) from duct for first 12--in (305 mm) away from unit.

PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in damage to roofing materials.

Membrane roofs can be cut by sharp sheet metal edges. Be careful when placing any sheet metal parts on such roof.

Step 6 — Rig and Place Unit

When the unit is ready to be rigged and no longer will be lifted by a fork truck, the wood protector under the basepan must be removed. Remove 4 screws from each base rail. Wood protector will drop to the ground. See instructions on the unit base rails.

Keep unit upright and do not drop. Spreader bars are required. 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.

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

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.

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

CAUTION

548J*14D

PLACE ALL GASKET IN PLACE BEFORE PLACING UNIT ON ROOF CURB.

“B”

UNIT

548J*14D 2015 916 116.0 2945 55.5 1410 59.5 1510

NOTES:

1. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not used.

2. Dimensions in ( ) are in millimeters.

3. 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.

914 - 1371

( 36” - 54” )

“C”

“A”

SEE DETAIL “A”

MAX WEIGHT

LB KG IN MM IN MM IN MM

A B C

DUCT END

DIMENSIONS

DETAIL “A”

Fig. 5 -- Rigging Details

C10281

PositioningonCurb—

For full perimeter curbs CRRFCURB072A00 and 073A00, the clearance between the roof curb and the front

and rear base rails should be

/4in (6.4 mm). The

clearance between the curb and the end base rails should

/2in (13 mm). For retrofit applications with curbs

be CRRFCURB003A01 and 4A01, the unit should be position as shown in Fig. 6. Maintain the 15.5 in (394

/8in (220 mm) clearances and allow the

Fig. 6 -- Retrofit Installation Dimensions

548J*14D

mm) and 8

/16in (567 mm) dimension to float if necessary.

If the alternative condensate drain location through the bottom of the unit is used in conjunction with a retrofit curb, the hole in the curb must be moved 12.5 in (320 mm) towards the end of the unit.

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

Remove all shipping materials and top skid. Remove extra center post from the condenser end of the unit so that the condenser end of the unit matches Fig. 16 -- 18. Recycle or dispose of all shipping materials.

Step 7 — Convert to Horizontal and Connect Ductwork (when required)

C10003

C06108

Fig. 7 -- Horizontal Conversion Panels

Step 8 — Install Outside Air Hood

Economizer Hood Removal and Setup -Factory Option —

1. The hood is shipped in knock--down form and located in the return air compartment. It is attached to the economizer using two plastic tie--wraps.

2. To gain access to the hood, remove the filter access panel. (See Fig. 8.)

3. Locate and cut the (2) plastic tie--wraps, being careful to not damage any wiring. (See Fig. 9.)

4. Carefully lift the hood assembly through the filter access opening and assemble per the steps outlined in Economizer Hood and Two–Position Hood on page 10.

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 using accessory CRDUCTCV001A00. To convert to horizontal configuration, remove screws from side duct opening covers and remove covers.

Discard the supply duct cover. Install accessory CRDUCTCV001A00 to cover the vertical supply duct opening. Use the return duct cover removed from the end panel to cover the vertical return duct opening.

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.

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

FILTER ACCESS PANEL

INDOOR COIL ACCESS PANEL

C10004

Fig. 8 -- Typical Access Panel Locations

Remove Hood Parts

Cut Plastic Ties (2) Places

Economizer

Fig. 9 -- Economizer Wiring

C10005

Two Position Damper Hood Removal and Setup -Factory Option —

1. The hood is shipped in knock--down form and assembled to a metal support tray using plastic stretch wrap. Located in the return air compartment, the assembly’s metal tray is attached to the basepan and also attached to the damper using two plastic tie--wraps.

2. To gain access to the hood, remove the filter access panel. (See Fig. 8.)

3. Locate the (2) screws holding the metal tray to the basepan and remove. In order to remove the screws, it may be necessary to remove the panel underneath the two--position damper. Remove the two screws. Locate and cut the (2) plastic tie--wraps securing the assembly to the damper. (See Fig. 10.) Be careful to not damage any wiring or cut tie--wraps securing any wiring.

4. Carefully lift the hood assembly (with metal tray) through the filter access opening and assemble per the steps outlined in Economizer Hood and Two–Position Hood on page 10.

5. If removed, reattach the panel under the damper.

548J*14D

Screws for Metal Tray Qty (2)

Fig. 10 -- Damper Assembly

Hood Parts

Plastic Tie Wrap Qty (2)

C10006

Economizer Hood and Two--Position 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. If the panel is still attached to the unit, remove the screws along the sides and bottom of the panel. See Fig. 11.

SIDE PAN EL

5. Attach the post that separates the filters with the screws provided.

6. Open the filter clips which are located underneath the hood top. Insert the aluminum filters into the bottom filter rack (hood divider). Push the filter into position past the open filter clips. Close the filter clips to lock the filters into place. See Fig. 13.

7. Install the two rain deflectors on the edge of the hood topasshowninFig.11.

RAIN DEFLECTORS

548J*14D

CAULK

INDOOR COIL ACCESS PAN EL

HERE

Fig. 11 -- Indoor Coil Access Panel Relocation

2. Swing out indoor coil access panel and insert the

hood sides under the panel (hood top). Be careful not to lift the panel too far as it might fall out. 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. 12.

TOP PAN EL

INDOOR COIL ACCESS PAN EL

INDOOR COIL ACCESS PANEL

C10007

BAROMETRIC RELIEF

DIVIDER

CLEANABLE ALUMINUM FILTER

FILTER

OUTSIDE AIR

HOOD

FILTER CLIP

C10009

Fig. 13 -- Economizer Filter Installation

8. Caulk the ends of the joint between the unit top panel and the hood top as shown in Fig. 11.

9. Replace the filter access panel.

Step 9 — Install External Condensate Trap and Line

The unit has one3/4-in. condensate drain connection on the end of the condensate pan and an alternate connection on the bottom. See Fig. 14. Unit airflow configuration does not determine which drain connection to use. Either drain connection can be used with vertical or horizontal applications.

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 can be tightened with a

/2--in. square socket drive extension.

SCREW

LEFT HOOD SIDE

HOOD DIVIDER

C10008

Fig. 12 -- Economizer Hood Construction

3. Remove the shipping tape holding the economizer barometric relief damper in place.

4. Insert the hood divider between the hood sides. See Fig. 12 and 13. Secure hood divider with 3 screws on each hood side. The hood divider is also used as the bottom filter rack for the aluminum filter.

To use the alternate bottom drain connection, remove the red drain plug from the bottom connection (use a

/2-- i n . square socket drive extension) and install it in the side drain connection.

CONDENSATE PAN (SIDE VIEW)

STANDARD SIDE DRAIN

DRAIN

PLUG

(FACTORY-INSTALLED)

ALTERNATE BOTTOM DRAIN

C08021

Fig. 14 -- Condensate Drain Pan (Side View)

The piping for the condensate drain and external trap can be completed after the unit is in place. See Fig. 15.

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

BASE RAIL

OPEN VENT

2˝ (51) MIN

TO ROOF DRAIN

DRAIN PLUG

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

SEE NOTE

ROOF CURB

C08022

Fig. 15 -- Condensate Drain Piping Details

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

/4-in.).

(

Step 10 — Make Electrical Connections

WARNING

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.

C10010

Fig. 16 -- Conduit into Factory Option Disconnect

548J*14D

C10011

Fig. 17 -- Conduit into Control Box

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 —

For those units without through--the--curb power, conduit must be used to route the main power from the condenser end of the unit to either the factory option disconnect, the bottom of the control box or the single point box accessory. 1” conduit is provided behind the access panel located under the control box. For those units that require conduit larger than 1”, it must be field supplied. Figures 16, 17 and 18 show the various wire routings.

C10012

Fig. 18 -- Conduit into Single Point Box

If the field disconnect is larger than 100A, it must be attached to the unit using accessory CRDISBKT001A00 (see Fig. 19). Follow the instructions provided with this accessory. For smaller field disconnects, be sure to use

/2” screws to mount the disconnect directly to the end panel (see Fig. 20). In either case, set the disconnect vertical location on the unit so that a 90_ fitting can be used to connect the conduit to the disconnect.

548J*14D

C10014

Fig. 19 -- Mounting Position for Field Disconnects

(over 100A)

Make field power connections directly to line connection pressure lugs only.

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 furnace. Use only copper wire. (See Fig. 21.)

ELECTRIC

DISCONNECT

SWITCH

COPPER

WIRE ONLY

ALUMINUM

WIRE

A93033

Fig. 21 -- Disconnect Switch and Unit

C10013

Fig. 20 -- Mounting Position for Field Disconnects

(up to 100A)

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 connection and moving it to the 200-v

/4-in. female spade connector from the 230--v

/4-in. male

terminal on the primary side of the transformer. Refer to

unit label diagram for additional information. Field power wires are connected to the unit at line--side

pressure lugs at the main terminal block (TB1) or at factory--installed option non--fused disconnect switch. Max wire size is #2 AWG (copper only). (See Fig. 22)

NOTE: TEST LEADS -- Unit may be equipped with short leads (pigtails) on the field line connection points off the optional disconnect switch. These leads are for factory run--test purposes only; remove and discard before connecting field power wires to unit connection points.

All Units --

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

Size wire based on MCA (Minimum Circuit Amps) on the unit informative plate. See Fig. 22 and the unit label diagram for power wiring connections to the unit power terminal blocks and equipment ground. Maximum wire size is #2/0 AWG per pole.

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.

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 4 (see Note 2 on page 32) to determine the percent of voltage imbalance.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage.

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.

Units Without Factory--Installed Disconnect —

When installing units, provide a disconnect switch of adequate size per NEC (National Electrical Code). 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.

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. 22). The factory disconnect is an 80A disconnect.

Units Without Disconnect Option

TB1

11 13 13

Disconnect

per

NEC

a 125--volt GFCI (ground--fault circuit--interrupter) duplex receptacle rated at 15--A behind a hinged waterproof access cover, located on the panel beneath the control box. See Fig. 23.

Pwd-CO

Fuse

Switch

Pwd-CO

Convenience

Outlet

GFCI

Disconnect

Access Panel

Transformer

C10361

Fig. 23 -- Convenience Outlet Location

548J*14D

L2 L3

208/230-3-60

460-3-60 575-3-60

Units With Disconnect Option

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.

Two types of convenience outlets are offered on 548J*14D models: non--powered and unit--powered. Both types provide

Optional

Disconnect

Disconnect factory test leads; discard.

Switch

Fig. 22 -- Power Wiring Connections

WARNING

Factory

Wiring

C10015

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 and conduit requirements, 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.

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 panel beneath the control box. See Fig. 23.

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. 24. On a unit without a unit--mounted disconnect, connect the source leads to the main terminal block (TB1).

If the convenience outlet transformer is connected to the line side of a field disconnect, the conduit provided with the unit must be used to protect the wire as they are routed from the transformer to the field disconnect. The end of the conduit with the straight connector attaches to the field disconnect. The other end does not need to connect o

the transformer; however, the conduit must be routed so that all wiring is either in the conduit or behind the access panel.

If the convenience outlet transformer is connected to the line side of the factory disconnect option, route the wires through the web bushing located on the bottom of the disconnect box. For the load side wiring to the factory option disconnect, route the wires through the hole on the right side of the disconnect. Be sure to create a drip loop at least 6” long.

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 (i.e., limit loads exceeding 8--amps to 30 minutes of operation every hour).

Test the GFCI receptacle by pressing the TEST button on

548J*14D

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.

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury or death.

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.

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

UNIT

VOLTAGE

208,

230

460 480

575 600

CONNECT

240

PRIMARY

CONNECTIONS

L1: RED +YEL L2: BLU + GRA

L1: RED Splice BLU + YEL L2: GRA

L1: RED L2: GRA

C08283

TRANSFORMER

TERMINALS

H1 + H3 H2 + H4

H2 + H3

H1 H2

DISCONNECT ALL POWER TO UNIT AND CONVENIENCE OUTLET.

Remove the blank cover plate at the convenience outlet; discard the blank cover.

Loosen the two screws at the GFCI duplex outlet, until

approximately

/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. 25. 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

Fig. 24 -- Unit 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

C09022

Fig. 25 -- Weatherproof Cover Installation

Factory--Option Thru--Base Connections —

This service connection kit consists of a

bulkhead connector and a 1

/2--in electrical bulkhead

/2--in electrical

connector, all factory--installed to the basepan cover plate. Remove the cover plate from the shipping bracket and

attach to basepan with 8 screws provided. The

/2-- i n

bulkhead connector enables the low--voltage control 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. 26.

Thermostat —

Install a Bryant--approved accessory 2 stage Cooling/Heating thermostat according to installation instructions included with the accessory. The 548J*14D models do not require a thermostat with an O function to control the reversing valve operation. If using an electronic thermostat, configure it for “non--heat pump” operation. Locate the thermostat accessory on a solid wall in the conditioned space to sense average temperature in accordance with the thermostat installation instructions.

Check tightness of connector lock nuts before connecting electrical conduits.

LOW VOLTAGE CONDUIT CONNECTOR

HIGH VOLTAGE CONDUIT CONNECTOR

C10017

Fig. 26 -- Thru--Base Connection Fittings

Field--supplied and field--installed liquidtight conduit connectors and conduit may be attached to the connectors on the basepan. Pull correctly rated high voltage and low voltage wires 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). Remove one of the two knockouts located on the bottom left side of the unit control box. Use this hole for the control conduit.

Units without Thru--Base Connections —

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. 22.

Field Control Wiring —

The 548J*14D 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.

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.

For wire runs up to 50 ft. (15 m), use no. 18 AWG (American Wire Gage) insulated wire (35_C minimum). For50to75ft.(15to23m),useno.16AWGinsulated wire (35_C minimum). For over 75 ft. (23 m), use no. 14 AWG insulated wire (35_C 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.

Terminal

Central

Board

T H E R M O S T A T

C09012

Typical

Thermostat

Connections

O/B/Y2

(Note 1)

Note 1: Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2. Do not configure for O output.

Note 2: W2 connection not required on units without electric heating.

Field Wiring

(Note 2)

Fig. 27 -- Typical Low--Voltage Control Connections

548J*14D

Unit without Thru--Base Connection Kit —

Electric Heaters

Pass the thermostat control wires through the bushing on the unit end panel. Route the wire through the snap--in wire tie and up to the web bushing near the control box. Route the wire through the bushing and into the bottom left side of the control box after removing one of the two knockouts in the corner of the box. Using a connector at the control box to protect the wire as it passes into the control box. Pull the wires over to the terminal strip at the upper left corner of the Central Terminal Board (CTB). Use the connector at the control box and the wire tie to ensure that the thermostat wire is tight and will not be damaged by contact with the condenser coil. See Fig. 28.

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

Heat Anticipator Settings —

Set heat anticipator settings at 0.14 amp for the first stage

548J*14D

and 0.14 amp for second--stage heating, when available.

548J*14D 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. 29.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage.

Not all available heater modules and single point boxes 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 and single point boxes.

Fig. 28 -- Thermostat Wire Routing

C10018

DISCONNECT MOUNTING LOCATION

SINGLE POINT BOX

HEATER COVERS

MANUAL RESET LIMIT SWITCH

SINGLE POINT BOX MOUNTING SCREW

Fig. 29 -- Typical Component Location

Single Point Boxes

When heaters are installed, power wiring to both heaters and the rest of the unit is connected via the single point box accessory, which 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. 29. The single point box also includes 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.

CONTROL BOX

BUSHING

SINGLE POINT BOX MOUNTING SCREWS

DRIP BOOT BRACKET MOUNTING SCREWS

POWER WIRES

FOAM BUSHING

HEATER RELAYS

HEATER MOUNTING SCREWS

A L

LIE

P A

O R

P .

M O DE

ERI

A L

N O.

2 2

. 2

ISTED

AIR

NDITIONING

1 2 3

UIP

ACCESS

346N

/ N

5 6

REV

Fig. 30 -- Typical Single Point Installation

C08136

HEATER MODULE (LOCATION 1)

HEATER MODULE (LOCATION 2)

HEATER MOUNTING BRACKET

C10029

Heater 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.

All fuses on 548J 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.)

Heater Low--Voltage Control Connections —

One or two heaters can be installed in the unit. Use the wiring procedure listed below for each heater as determined by the number of stages in the heater.

Single Stage Heaters: Single--stage heaters will have an orange and a brown control wire. Connect these to the orange and brown wires located on TB4.

Two Stage Heaters: Two--stage heaters will have orange, purple, red and brown wires. The orange and the purple are the control wires and the red and brown wires feed the safety circuit. Connect both the orange and the purple wires to the orange wire locations of TB4. Connect the red and brown wires to red and brown wires on TB4. If more than one heater is installed, repeat the wiring procedure for the second heater. The 3 locations across the top of TB4 do allow a switch to be installed in series with some of the heaters in order to add additional heater control.

548J*14D

NOTE:

Optional Outdoor Temperature Control at One Heater Stage –

Move either heater wire to this terminal and connect outdoor temperature switch between 2nd and 3rd terminals.

Fig. 31 -- Accessory Electric Heater Control Connections

C10354

Outdoor Air Enthalpy Control (PNO 33CSENTHSW)

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. 32.)

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. 32. Connect the enthalpy control power input terminals to economizer actuator power leads RED (connect to 24V) and BLK (connect to GND).

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

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. 32.

Enthalpy

Switch

– 4-20 mA In

+ VDC Out

Return Air

Enthalpy Sensor

+ 24-36 VDC In

– 4-20 mA Out

24V

GND

LOW

RED

BLK

GRA

ESL

Factory

Wiring

Harness

ECONO MOTOR

CTB ECON

C10282

Fig. 32 -- Outside and Return Air Enthalpy Sensor

Wiring

RTU--MP Control System

The RTU--MP controller, see Fig. 33, 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 548J*14D unit’s main control box, to the left of the CTB. See Fig. 34. 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$ert2 package.

Refer to Table 2, RTU--MP Controller Inputs and Outputs for locations of all connections to the RTU--MP board.

548J*14D

Fig. 33 -- RTU--MP Multi--Protocol Control Board

Fig. 34 -- 548J*14D Control Box Component Locations

C07129

C10024

548J*14D

Fig. 35 -- RTU--MP System Control Wiring Diagram

C10322

Table 2 – RTU--MP Controller Inputs and Outputs

POINT NAME

Space Temperature Sensor sptsens AI (10K Thermistor) J 2 0 --- 1 , 2

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) J 20 --- 3

Indoor Air Quality iaq A I ( 4 --- 2 0 m a) J4---2, 3

Outdoor Air Quality oaq A I ( 4 --- 2 0 m a ) J4--- 5, 6

Safety Chain Feedback safety DI (24 VAC) J1---9

Compressor Safety compstat DI (24 VAC) J1--- 2

Fire Shutdown firedown DI (24 VAC) J 1 --- 1 0

Enthalpy Switch enthalpy DI (24 VAC) J2--- 6, 7

Humidistat Input Status humstat DI (24 VAC) J5 ---7, 8

Space Relative Humidity sprh A I ( 4 --- 2 0 m a)

Outside Air Relative Humidity oarh A I ( 4 --- 2 0 m a )

Supply Fan Status fanstat DI (24 VAC)

Filter Status filtstat DI (24 VAC)

Remote Occupancy Input remocc DI (24 VAC)

Economizer Commanded Position econocmd 4---20ma J2--- 5

SupplyFanRelayState 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) J 11 --- 3

Dehumidification Relay State humizer DO Relay (24VAC, 1A) J 1 1 --- 7 , 8

LEGEND AI --- A n a l o g I n p u t AO --- A n a l o g O u t p u t DI --- D is c r e t e I n p u t DO --- Discrete Output

* These inputs (if installed) take the place of the default input on the specific channel according to schematic. P a r a l l e l p i n s J 5 --- 1 = J 2 --- 6 , J 5 --- 3 = J 1 --- 1 0 , J 5 --- 5 = J 1 --- 2 a r e u s e d f o r f ie ld --- i n s t a l l a t i o n .

BACnet OBJECT

NAME

INPUTS

CONFIGURABLE INPUTS*

OUTPUTS

TYPE OF I/O

CONNECTION PIN

NUMBERS

J 4 --- 2 , 3 o r J 4 --- 5 , 6

J5-- -1,2 or J5---3,4 or

J5 5,6 or J5 -- -7,8

548J*14D

The RTU--MP controller requires the use of a Bryant space sensor. A standard thermostat cannot be used with the RTU--MP system.

Supply Air Temperature (SAT) Sensor —

On FIOP--equipped 548J*14D 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

/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. 36.

SUPPLY AIR TEMPERATURE SENSOR

SUPPLY AIR

RETURN AIR

Fig. 36 -- Typical Mounting Location for Supply Air

Temperature (SAT) Sensor on Small Rooftop Units

ROOF CURB

C10020

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.

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

Enthalpy control (outdoor air or differential sensors) Space CO Outdoor air CO

sensor

Field Connections

548J*14D

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 as shown in Fig. 28. This routing provides the UL required clearance between high-- and low--voltage wiring. Connect to the wires to the removable Phoenix connectors and then reconnect the connectors to the board.

Space Temperature (SPT) Sensors —

SW1

SEN

RED(+)

WHT(GND)

BLK(-)

BRN (GND) BLU (SPT)

CCN COM

SENSOR WIRING

C08201

Fig. 37 -- T--55 Space Temperature Sensor Wiring

SEN

J20-1

J20-2

C08460

Fig. 38 -- RTU--MP T--55 Sensor Connections

A field--supplied Bryant space temperature sensor is required with the RTU--MP to monitor space temperature. There are 3 sensors available for this application:

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

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.

Connect T--55: See Fig. 37 for typical T--55 internal connections. Connect the T--55 SEN terminals to RTU--MP J20--1 and J20--2. See Fig. 38.

Connect T--56: See Fig. 39 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. 40.

SW1

Cool Warm

SEN

RED(+)

WHT(GND)

BLK(-)

SET

BLK (T56)

BRN (GND) BLU (SPT)

CCN COM

SENSOR WIRING

JUMPER TERMINALS AS SHOWN

C08202

Fig. 39 -- T--56 Internal Connections

SEN J20-1

SEN

Jumper

J20-2

SET

J20-3

C08461

Fig. 40 -- RTU--MP T--56 Sensor Connections

Connect T--59: The T--59 space sensor requires a

separate, isolated power supply of 24 VAC. See Fig. 41 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.

Indoor Air Quality (CO

sensor) —

The indoor air quality sensor accessory monitors space carbon dioxide (CO

) 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 CO

The CO

sensors are all factory set for a range of 0 to

present in the space air.

2000 ppm and a linear mA output of 4 to 20. Refer to the instructions supplied with the CO

sensor for electrical

requirements and terminal locations. See Fig. 42 for typical CO

sensor wiring schematic.

BLK (STO)

BRN (COM)

BLU (SPT)

OR SET SEN

OPB COM- PWR+

24 VAC

NOTE: Must use a separate isolated transformer.

J20-3

J20-2

J20-1

SENSOR WIRING

POWER WIRING

C10291

Fig. 41 -- Space Temperature Sensor Typical Wiring

(33ZCT59SPT)

Economizer Controls —

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

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.

0-10VDC

SIG COM

4-20mA

ALARM

NC COM

RELAY

}

CONTACTS

24 VAC

24 VDC

J3 J4

C08635

Fig. 42 -- 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 CO 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.

548J*14D

To connect the sensor to the control, identify the positive (4 to 20 mA) and ground (SIG COM) terminals on the sensor. See Fig. 42. Connect the 4--20 mA terminal to RTU--MP J4--2 and connect the SIG COM terminal to RTU--MP J4--3. See Fig. 43.

IAQ Sensor

SEN

COM

24 VAC

Fig. 43 -- RTU--MP / Indoor CO2Sensor

(33ZCSENCO2) Connections

Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus weatherproof enclosure) —

The outdoor air CO

548J*14D

dioxide (CO

) levels in the outside ventilation air and

sensor is designed to monitor carbon

interface with the ventilation damper in an HVAC system. The OAQ sensor is packaged with an outdoor cover. See Fig. 44. The outdoor air CO

sensor must be located in the

economizer outside air hood.

COVER REMOVED SIDE VIEW

Fig. 44 -- Outdoor Air Quality Sensor Cover

Wiring the Outdoor Air CO

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. 42. Connect the 4 to 20 mA terminal to RTU--MP J4--5. Connect the SIG COM terminal to RTU--MP J4--6. See Fig. 45.

J4-2

J4-3

C08462

C07135

OAQ Sensor/RH Sensor

SEN

COM

24 VAC

J4-5

J4-6

C08463

Fig. 45 -- RTU--MP / Outdoor CO2Sensor

(33ZCSENCO2) Connections

On 548J*14D 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. 35, RTU--MP System Control wiring schematic.

The Fire Shutdown Switch configuration,

→

Config→Inputs→input 5, identifies the normally

open status of this input when there is no fire alarm.

Connecting Discrete Inputs —

Filter Status: 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

→

Config→Inputs→input3,5,8,or9to 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. 33 and Fig. 35 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

→

Config→Inputs→input3,5,8,or9to 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. 33 and Fig. 35 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

→

Occupancy and normally open (N/O) or normally closed (N/C).

Also set MENU on/off. Input 8 or 9 is recommended for easy of installation. Refer to Fig. 33 and Table 2 for wire terminations at J5.

Config→Inputs→input3,5,8,or9to Remote

→

Schedules→occupancy source to DI

Power Exhaust (output): Connect the accessory Power

Exhaust contactor coil(s) per Fig. 46.

Power Exhaust

PEC

GRA

J11-3

CTB

THERMOSTAT

TAN

Fig. 46 -- RTU--MP Power Exhaust Connections

Space Relative Humidity Sensor -- The RH sensor is not used with 548J*14D models at this time.

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. 47 for the switch setting

C10362

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.

Local Access —

BACview6Handheld: The BACview

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. 48. This is an accessory interface that does not come with the MP controller and can only be used at the

unit. Connect the BACview

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: Virtual BACview is a freeware computer

program that functions as the BACview

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.

548J*14D

SW3 Protocol Selection

PROTOCOL DS8 DS7 DS6 DS5 DS4 DS3 DS2 DS1

BACnet MS/TP (Master)

Modbus (Slave)

N2 (Slave)

LonWorks Unused ON ON OFF ON OFF OFF OFF

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

BAUD RATE DS2 DS1

9600 OFF OFF

19,200 ON OFF

38,400 OFF ON

76,800 ON ON

Unused OFF OFF OFF ON OFF Select Baud Select Baud

Unused OFF OFF ON ON OFF Select Baud Select Baud

Unused OFF OFF OFF ON ON OFF OFF

Baud Rate Selections

Fig. 47 -- RTU--MP SW3 Dip Switch Settings

C07166

548J*14D

Fig. 48 -- BACview6Handheld Connections

Table 3 – 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

The Run and Error LEDs indicate control module and network status

C07170

If Run LED shows...

2 flashes per second Off Normal

2 flashes per second

2 flashes per second On

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

14 flashes per second

On On

And Error LED shows... Status is...

2flashes, alternating with Run LED

3flashes, then off

4flashes, then pause

7 flashes per second, alternating with Run LED

14 flashes per second, alternating with Run LED

Five minute auto --- restart delay after system error

Control module has just been formatted

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

Exec halted after frequent system errors or control programs halted

Ten second recovery period after brownout

Brownout

Failure. Try the following solutions:

S T urn the RTU ---MP off, then on. S F or ma t t he R T U --- M P . S Download memory to the RTU---MP. S Replace the RTU---MP.

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.

Smoke Detectors

Duct smoke sensor

controller

Smoke detectors are available as factory--installed options on 548J*14D 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.

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 29 for details. 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.

Controller —

Controll er housing

and electronics

Conduit c ouplings

(supplie d by installer)

Conduit nuts

(supplie d by installer)

Conduit s upport plate

Terminal block cover

Fastener

(2X)

Alarm

Troub le

Power

Test/reset switch

Fig. 49 -- Controller Assembly

Cover gasket

(ordering option)

Controll er cover

548J*14D

C08208

The controller (see Fig. 49) 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, all located on the cover face.

Sensor —

The sensor (see Fig. 50) 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).

See

Detail A

Intake

gasket

Plug

Duct smoke sensor

Exhaust tube

TSD-CO2

(ordering option)

Sampling tube

(ordered separately)

Magnetic test/reset

switch

Exhaust gasket

Coupling

Alarm

Troub le

Sensor housing and electro nics

Power Dirty

Fig. 50 -- Smoke Detector Sensor

Cover gasket

(ordering option)

Sensor cover

C08209

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.

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.

For installations using two sensors, the duct smoke detector does not differentiate which sensor signals an

548J*14D

alarm or trouble condition.

Smoke Detector Locations

Supply Air —

Return Air without Economizer —

The sampling tube is located across the return air opening on the unit basepan. See Fig. 52. 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:” on page 29 for details.) 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. 52. 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.)

The Supply Air smoke detector sensor is located to the left of the unit’s indoor (supply) fan. See Fig. 51. Access is through the left side blower 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.

Smoke Detector Sensor

C08245

Fig. 51 -- Typical Supply Air Smoke Detector Sensor

Location

Flexible Exhaust Tube

Return Air Sampling Tube

C10330

Fig. 52 -- Return Air Sampling Tube Location

Completing Installation of Return Air Smoke Sensor:

1. Unscrew the two screws holding the Return Air Sensor detector plate. See Fig. 53. 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. 54.

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. 54.

5. Connect the flexible tube on the sampling inlet to the sampling tube on the basepan.

Controlle

Screws

Flexible Exhaust Tubes

Additional Application Data —

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

548J*14D

Sampling Tube

Fig. 53 -- Return Air Detector Shipping Position

Sampling Tube

Fig. 54 -- Return Air Sensor Operating Position

C10331

C10332

Table 4 – Unit Wire/Fuse or HACR Breaker Sizing Data

ELEC. HTR PE NO C.O. or UNPWR C.O.

UNIT

CRHEATER

IFM TYPE

***A00

Nom (kW)

N O M . V --- P h --- H z

NONE --- ---

291A00 12.4/16.5 34.4/39.7 105.4/112.0 110/125 105/111 400/406 109.2/115.8 110/125 109/115 404/410

288A00,291A00 19.9/26.5 55.3/63.8 131.5/142.2 150/150 129/139 477/494 135.3/146.0 150/150 133/143 481/498

294A00 25.2/33.5 69.9/80.6 149.8/163.2 150/175 146/158 436/447 153.6/167.0 175/175 150/162 440/451

STD

288A00,294A00 32.7/43.5 90.7/104.7 175.8/193.3 200/200 170/186 547/575 179.6/197.1 200/200 174/190 551/579

291A00,294A00 37.6/50.0 104.3/120.3 192.8/182.7 200/200 185/204 575/607 196.6/186.5 200/200 190/208 579/611

NONE --- ---

291A00 12.4/16.5 34.4/39.7 105.4/112.0 110/125 105/111 400/406 109.2/115.8 110/125 109/115 404/410

288A00,291A00 19.9/26.5 55.3/63.8 131.5/142.2 150/150 129/139 477/494 135.3/146.0 150/150 133/143 481/498

294A00 25.2/33.5 69.9/80.6 149.8/163.2 150/175 146/158 436/447 153.6/167.0 175/175 150/162 440/451

MED

288A00,294A00 32.7/43.5 90.7/104.7 175.8/193.3 200/200 170/186 547/575 179.6/197.1 200/200 174/190 551/579

208/230--- 3 --- 60

291A00,294A00 37.6/50.0 104.3/120.3 192.8/182.7 200/200 185/204 575/607 196.6/186.5 200/200 190/208 579/611

NONE --- ---

548J*14D

4 6 0 --- 3 --- 6 0

5 7 5 --- 3 --- 6 0

291A00 12.4/16.5 34.4/39.7 118.3/124.9 125/125 120/126 436/442 122.1/128.7 125/150 124/130 440/446

288A00,291A00 19.9/26.5 55.3/63.8 144.4/155.1 150/175 144/154 513/530 148.2/158.9 150/175 148/158 517/534

294A00 25.2/33.5 69.9/80.6 162.7/176.1 175/200 161/173 472/483 166.5/179.9 175/200 165/177 476/487

HIGH

288A00,294A00 32.7/43.5 90.7/104.7 188.7/206.2 200/225 184/201 583/611 192.5/210.0 200/225 189/205 587/615

291A00,294A00 37.6/50.0 104.3/120.3 205.7/195.6 225/225 200/219 611/643 209.5/199.4 225/225 204/223 615/647

NONE --- ---

292A00 16.5 19.9 54.5 60 54 204 56.3 60 56 206

289A00,292A00 26.5 31.9 69.5 70 68 248 71.3 80 70 250

295A00 33.5 40.3 80.0 90 77 224 81.8 90 79 226

STD

289A00,295A00 43.5 52.3 95.0 100 91 289 96.8 100 93 291

292A00,295A00 50.0 60.2 89.9 100 100 304 91.7 100 102 306

NONE --- ---

292A00 16.5 19.9 54.5 60 54 204 56.3 60 56 206

289A00,292A00 26.5 31.9 69.5 70 68 248 71.3 80 70 250

295A00 33.5 40.3 80.0 90 77 224 81.8 90 79 226

MED

289A00,295A00 43.5 52.3 95.0 100 91 289 96.8 100 93 291

292A00,295A00 50.0 60.2 89.9 100 100 304 91.7 100 102 306

NONE --- ---

292A00 16.5 19.9 61.3 70 62 222 63.1 70 64 224

289A00,292A00 26.5 31.9 76.3 80 76 266 78.1 80 78 268

295A00 33.5 40.3 86.8 90 85 242 88.6 90 87 244

HIGH

289A00,295A00 43.5 52.3 101.8 110 99 307 103.6 110 101 309

292A00,295A00 50.0 60.2 96.7 100 108 322 98.5 110 110 324

NONE --- ---

293A00 16.5 15.9 43.9 45 43 152 47.7 50 48 156

290A00,293A00 26.5 25.5 55.9 60 55 187 59.7 60 59 191

296A00 33.5 32.2 64.3 70 62 168 68.1 70 67 172

STD

290A00,296A00 43.5 41.8 76.3 80 73 220 80.1 90 78 224

293A00,296A00 50.0 48.1 72.1 80 81 232 75.9 80 85 236

NONE --- ---

293A00 16.5 15.9 43.9 45 43 152 47.7 50 48 156

290A00,293A00 26.5 25.5 55.9 60 55 187 59.7 60 59 191

296A00 33.5 32.2 64.3 70 62 168 68.1 70 67 172

MED

290A00,296A00 43.5 41.8 76.3 80 73 220 80.1 90 78 224

293A00,296A00 50.0 48.1 72.1 80 81 232 75.9 80 85 236

NONE --- ---

293A00 16.5 15.9 50.2 60 51 164 54.0 60 55 168

290A00,293A00 26.5 25.5 62.2 70 62 199 66.0 70 66 203

296A00 33.5 32.2 70.6 80 69 180 74.4 80 74 184

HIGH

290A00,296A00 43.5 41.8 82.6 90 80 232 86.4 90 85 236

293A00,296A00 50.0 48.1 78.5 90 88 244 82.3 90 92 248

NOTE: See page 32 for table legend and notes.

FLA FLA

3.8

1.8

3.8

NO P.E. w/ P.E. (pwrd fr/unit)

MCA

62.4 80 65 366 66.2 80 70 370

75.3 90 80 402 79.1 100 85 406

29.7 40 31 184 31.5 40 33 186

36.5 45 39 202 38.3 45 41 204

24.0 30 25 136 27.8 30 30 140

30.4 35 32 148 34.2 40 37 152

FUSE or

HACR BRKR

DISC. SIZE

FLA LRA FLA LRA

MCA

FUSE or

HACR BRKR

DISC. SIZE

Table 4 – Unit Wire/Fuse or HACR Breaker Sizing Data (cont)

ELEC. HTR PE w/ PWRD C.O.

UNIT

CRHEATER

IFM TYPE

***A00

Nom (kW)

FLA FLA

N O M . V --- P h --- H z

NONE --- ---

291A00 12.4/16.5 34.4/39.7 110.2/116.8 125/125 110/116 405/411 114.0/120.6 125/125 115/121 409/415

288A00,291A00 19.9/26.5 55.3/63.8 136.3/147.0 150/150 134/144 482/499 140.1/150.8 150/175 139/149 486/503

294A00 25.2/33.5 69.9/80.6 154.6/168.0 175/175 151/164 441/452 158.4/171.8 175/175 156/168 445/456

STD

288A00,294A00 32.7/43.5 90.7/104.7 180.6/198.1 200/200 175/191 552/580 184.4/201.9 200/225 180/196 556/584

291A00,294A00 37.6/50.0 104.3/120.3 197.6/187.5 200/200 191/209 580/612 201.4/191.3 225/200 195/214 584/616

NONE --- ---

291A00 12.4/16.5 34.4/39.7 110.2/116.8 125/125 110/116 405/411 114.0/120.6 125/125 115/121 409/415

288A00,291A00 19.9/26.5 55.3/63.8 136.3/147.0 150/150 134/144 482/499 140.1/150.8 150/175 139/149 486/503

294A00 25.2/33.5 69.9/80.6 154.6/168.0 175/175 151/164 441/452 158.4/171.8 175/175 156/168 445/456

MED

288A00,294A00 32.7/43.5 90.7/104.7 180.6/198.1 200/200 175/191 552/580 184.4/201.9 200/225 180/196 556/584

208/230--- 3 --- 60

291A00,294A00 37.6/50.0 104.3/120.3 197.6/187.5 200/200 191/209 580/612 201.4/191.3 225/200 195/214 584/616

NONE --- ---

291A00 12.4/16.5 34.4/39.7 123.1/129.7 125/150 125/131 441/447 126.9/133.5 150/150 130/136 445/451

288A00,291A00 19.9/26.5 55.3/63.8 149.2/159.9 150/175 149/159 518/535 153.0/163.7 175/175 154/163 522/539

294A00 25.2/33.5 69.9/80.6 167.5/180.9 175/200 166/178 477/488 171.3/184.7 175/200 170/183 481/492

HIGH

288A00,294A00 32.7/43.5 90.7/104.7 193.5/211.0 200/225 190/206 588/616 197.3/214.8 200/225 194/210 592/620

291A00,294A00 37.6/50.0 104.3/120.3 210.5/200.4 225/225 206/224 616/648 214.3/204.2 225/225 210/228 620/652

NONE --- ---

292A00 16.5 19.9 56.7 60 56 206 58.5 60 59 208

289A00,292A00 26.5 31.9 71.7 80 70 250 73.5 80 72 252

295A00 33.5 40.3 82.2 90 80 226 84.0 90 82 228

STD

289A00,295A00 43.5 52.3 97.2 100 94 291 99.0 100 96 293

292A00,295A00 50.0 60.2 92.1 100 103 306 93.9 100 105 308

NONE --- ---

292A00 16.5 19.9 56.7 60 56 206 58.5 60 59 208

289A00,292A00 26.5 31.9 71.7 80 70 250 73.5 80 72 252

295A00 33.5 40.3 82.2 90 80 226 84.0 90 82 228

548J*14D

MED

289A00,295A00 43.5 52.3 97.2 100 94 291 99.0 100 96 293

4 6 0 --- 3 --- 6 0

292A00,295A00 50.0 60.2 92.1 100 103 306 93.9 100 105 308

NONE --- ---

292A00 16.5 19.9 63.5 70 64 224 65.3 70 66 226

289A00,292A00 26.5 31.9 78.5 80 78 268 80.3 90 80 270

295A00 33.5 40.3 89.0 90 88 244 90.8 100 90 246

HIGH

289A00,295A00 43.5 52.3 104.0 110 102 309 105.8 110 104 311

292A00,295A00 50.0 60.2 98.9 110 111 324 100.7 110 113 326

NONE --- ---

293A00 16.5 15.9 45.6 50 45 154 49.4 50 50 158

290A00,293A00 26.5 25.5 57.6 60 56 189 61.4 70 61 193

296A00 33.5 32.2 66.0 70 64 170 69.8 70 69 174

STD

290A00,296A00 43.5 41.8 78.0 80 75 222 81.8 90 80 226

293A00,296A00 50.0 48.1 73.8 80 82 234 77.6 80 87 238

NONE --- ---

293A00 16.5 15.9 45.6 50 45 154 49.4 50 50 158

290A00,293A00 26.5 25.5 57.6 60 56 189 61.4 70 61 193

296A00 33.5 32.2 66.0 70 64 170 69.8 70 69 174

MED

290A00,296A00 43.5 41.8 78.0 80 75 222 81.8 90 80 226

5 7 5 --- 3 --- 6 0

293A00,296A00 50.0 48.1 73.8 80 82 234 77.6 80 87 238

NONE --- ---

293A00 16.5 15.9 51.9 60 53 166 55.7 60 57 170

290A00,293A00 26.5 25.5 63.9 70 64 201 67.7 70 68 205

296A00 33.5 32.2 72.3 80 71 182 76.1 80 76 186

HIGH

290A00,296A00 43.5 41.8 84.3 90 82 234 88.1 90 87 238

293A00,296A00 50.0 48.1 80.2 90 90 246 84.0 90 94 250

NOTE: See page 32 for table legend and notes.

3.8

1.8

3.8

NO P.E. w/ P.E. (pwrd fr/unit)

MCA

67.2 80 71 371 71.0 80 75 375

80.1 100 86 407 83.9 100 90 411

31.9 40 34 186 33.7 40 36 188

38.7 45 41 204 40.5 50 43 206

25.7 30 27 138 29.5 35 32 142

32.1 40 34 150 35.9 40 39 154

FUSE or

HACR BRKR

DISC. SIZE

FLA LRA FLA LRA

MCA

FUSE or

HACR BRKR

DISC. SIZE

548J*14D

Legend and Notes for Table 4

LEGEND:

BRKR --- Circuit breaker CO --- Convenient outlet DISC - -- Disconnect FLA --- Full load amps IFM --- Indoor fan motor LRA --- Locked rotor amps MCA --- Minimum circuit amps P E --- P o w e r e x h a u s t PWRD CO --- Powered convenient outlet UNPWR CO --- Unpowered convenient outlet 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 d etermine the percentage of voltage imbalance.

% Voltage Imbalance = 100 x

548J*14D

max voltage deviation from average voltage

average voltage

Example: Supply voltage is 230-3-60

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

Average Voltage =

Determine maximum deviation from average voltage. (AB) 227 – 224 = 3 v (BC) 231 – 227 = 4 v (AC) 227 – 226 = 1 v Maximum deviation is 4 v. Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x

This amount of p hase 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.

(224 + 231 + 226)

= 227

= 1.76%

227

681

Economizer 2 Position Damper

Fig. 55 -- EconoMi$ert IV Wiring

Step 11 — Adjust Factory--Installed Options

Smoke Detectors —

Smoke detector(s) will be connected at the Central Terminal Board (CTB), at terminals marked “Smoke Shutdown”. Remove jumper JMP 3 when ready to energize unit.

Unit Without Economizer o 2 Position Damper

C10333

EconoMi$er IV Occupancy Switch —

Refer to Fig. 55 for general EconoMi$er IV wiring. External occupancy control is managed through a connection on the Central Terminal Board.

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 on CTB. Remove or cut jumper JMP 2 to complete the installation.

Step 12 — Install Accessories

Available accessories include:

Roof Curb (must be installed before unit) Thru--base connection kit (must be installed before unit

is set on curb; see page 15) Manual outside air damper Two--Position motorized outside air damper (see page 9) EconoMi$er IV (with control and integrated barometric

relief; see page 8) EconoMi$er2 (without control/for external signal and

integrated barometric relief; see page 8) Power Exhaust Differential dry--bulb sensor (EconoMi$er IV) Outdoor enthalpy sensor Differential enthalpy sensor Electric Heaters (see page 16) Single Point kits (see page 17) Thermostat / Sensors (see pages 21--22)

sensor (see pages 22--24)

Louvered 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.

548J*14D

E2011 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 01/11

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

Catalog No.: II548J--- 07

Replaces: II548J --- 06

Bryant 548J-14D User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual