Carrier WeatherExpert 50N2 Installation Instructions Manual

Packaged rooftop cooling units with optional electric heat or hydronic heat and comfortlink controls

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Controls, start-up, operation, service and troubleshooting instructions (248 pages)

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CONTENTS

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

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

ACOUSTICAL CONSIDERATIONS . . . . . . . . . . . . . . . 3

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Acoustic Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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

Step 1 — Perform Job Site Survey . . . . . . . . . . . . . . 4

Step 2 — Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Step 3 — Roof Mount Unit . . . . . . . . . . . . . . . . . . . . . 4

• STEEL BEAMS

• ROOF CURB

Step 4 — Slab Mount Unit . . . . . . . . . . . . . . . . . . . . . 4

Step 5 — Install Curb Gasketing . . . . . . . . . . . . . . . . 4

Step 6 — Install Field-Fabricated Ductwork . . . . . . 33

Step 7 — Rig Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Step 8 — Connect Condensate Drain . . . . . . . . . . . 33

Step 9 — Install Outdoor Air Hoods . . . . . . . . . . . . 38

Step 10 — Route Field Wiring . . . . . . . . . . . . . . . . . 39

Step 11 — Make Field Electrical Connections . . . . 39

• POWER WIRING

Step 12 — Connect Air Pressure Tubing . . . . . . . . 41

• VARIABLE FREQUENCY DRIVE

• POWER EXHAUST (PE)

• RETURN FAN

Step 13 — Remove Supply-Fan Shipping Bracket

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Step 14 — Remove PE Shipping Bracket Screws . 43

Step 15 — Remove Return-Fan Shipping Brackets . . 43

Step 16 — Remove Return-Fan Shipping Brackets . . 43

Step 17 — Install Supply-Air Thermistors . . . . . . . 43

Step 18 — Install Unit Accessories . . . . . . . . . . . . . 44

Two-Piece Unit Fit Up . . . . . . . . . . . . . . . . . . . . . . . . 44

CONTROLS INSTALLATION . . . . . . . . . . . . . . . . . . . 49

Constant Volume / Staged Air Volume Units . . . . . 49

• CONTROL WIRING

Variable Air Volume Units . . . . . . . . . . . . . . . . . . . . 49

• VAV CONTROL WIRING

• SENSORS

• HUMIDITY CONTROL AND HOT WATER AND

STEAM VALVES

• SPACE TEMPERATURE SENSOR (T-55)

• SPACE TEMPERATURE SENSOR (T-56)

• SPACE TEMPERATURE SENSOR (T-58)

• SPACE TEMPERATURE AVERAGING

• HEAT INTERLOCK RELAY (VAV UNITS ONLY)

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

Catalog No. 04-53500195-01

Installation Instructions

Page

Printed in U.S.A.

Form 50N-6SI

50N2,N3,N4,N5,N6,N7,N8,N9

Packaged Rooftop Cooling Units with

Optional Electric Heat or Hydronic Heat

and ComfortLink Controls

Option and Accessory Control Wiring . . . . . . . . . . .50

Carrier Comfort Network® (CCN) Interface . . . . . . .56

Optional UPC Open Installation . . . . . . . . . . . . . . . .56

• WIRING THE UPC OPEN TO THE MS/TP NETWORK

• MS/TP WIRING RECOMMENDATIONS

Smoke Control Modes . . . . . . . . . . . . . . . . . . . . . . . .58

• FIRE SHUTDOWN

• PRESSURIZATION

• EVACUATION

• SMOKE PURGE

• SMOKE CONTROL INSTALLATION

This installation instruction contains basic unit installation infor-

mation, including installation of thermostats and remote tempera-

ture sensors.

For additional information and service instructions, refer to the

Controls, Start-Up, Operation, Service, and Troubleshooting

manual.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be

hazardous due to system pressure and electrical components. Only

trained and qualified service personnel should install, repair, or

service air-conditioning equipment.

Untrained personnel can perform basic maintenance functions of

cleaning coils and filters and replacing filters. All other operations

should be performed by trained service personnel. When working

on air-conditioning equipment, observe precautions in the

literature, tags and labels attached to the unit, and other safety

precautions that may apply.

Follow all safety codes, including ANSI (American National

Standards Institute) Z223.1. Wear safety glasses and work gloves.

Use quenching cloth for unbrazing operations. Have fire

extinguisher available for all brazing operations.

It is important to recognize safety information. This is the safety-

alert symbol

. When you see this symbol on the 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.

Pg 1

WeatherExpert

GENERAL

1-2021

Replaces: 50N-5SI

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Summary of Contents for Carrier WeatherExpert 50N2

Page 1 CONTENTS Option and Accessory Control Wiring ...50 Carrier Comfort Network® (CCN) Interface ..56 Page Optional UPC Open Installation ....56 GENERAL .
Page 2 DANGER AVERTISSEMENT DO NOT USE TORCH to remove any component. System RISQUE D´INCENDIE OU D´EXPLOSION contains oil and refrigerant under pressure. Si les consignes de sécurité ne sont pas suivies à la lettre, cela To remove a component, wear protective gloves and goggles peut entraîner la mort, de graves blessures ou des dommages and proceed as follows: matériels.
Page 3 • Use round duct wherever possible because it is less noisy. ACOUSTICAL CONSIDERATIONS • Seal all penetrations around ductwork entering the space. In order to minimize sound transmitted to the space, please con- • Make sure that ceiling and wall contractors do not attach form to the following recommendations (see Fig.
Page 4 INSTALLATION Step 3 — Roof Mount Unit Check building codes for weight distribution requirements. Unit Step 1 — Perform Job Site Survey and accessory weights are shown in Tables 1 and 2. Unit may be Complete the following checks before installation. mounted on class A, B, or C roofing material.
Page 5 MINIMUM SPACING (ft) UNIT Series Series Fig. 2 — Multiple Unit Minimum Separation SIDE RAIL RAIL RAIL SIDE RAIL CROSS RAILS AT EACH LIFTING LUG LOCATION Fig. 3 — Steel Beam Mounting...
Page 6 SEE ROOF CURB CONDENSER SECTION DRAWING SEE ROOF CURB CONDENSER SECTION DRAWING Fig. 4 — 75-150 Ton 50N Roof Curb: Units without Plenum...
Page 7 50N 75-105 TON ROOF CURB — No Plenum PART SUPPLY FAN FIELD USE EXTENDED SPLIT NUMBER SIZE FILTER CHASSIS “A” (in.) “B” (in.) “C” (in.) “H” (in.) “J” (in.) CRRFCURB330A00 LOW 28 252.65 158.46 41.20 54.24 36.25 CRRFCURB331A00 HI 40 273.74 163.20 57.54...
Page 8 SEE ROOF CURB CONDENSER SECTION DRAWING SEE ROOF CURB CONDENSER SECTION DRAWING Fig. 5 — 75-150 Ton 48/50N Roof Curb: Units with Plenum, with Electric Heat, with Extra Sections; Units with Plenum, with and without Electric Heat, without Extra Sections...
Page 9 50N 75-105 TON ROOF CURB — WITH PLENUM PART SUPPLY FAN FIELD USE EXTRA EXTENDED SPLIT NUMBER SIZE FILTER SECT. CHASSIS “A” (in.) “B” (in.) “C” (in.) CRRFCURB201A00 LOW 28 None 296.11 193.61 49.50 CRRFCURB202A00 HI 40 None 311.20 208.70 49.50 CRRFCURB203A00 LOW 28...
Page 10 SEE ROOF CURB CONDENSER SECTION DRAWING SEE ROOF CURB CONDENSER SECTION DRAWING Fig. 6 — 75-150 Ton 50N Roof Curb: Units with Plenum, without Electric Heat, with Extra Sections...
Page 11 50N 75-105 TON ROOF CURB — WITH PLENUM, WITH POST, W/O ELECTRIC HEAT PART FIELD USE EXTRA EXTENDED SUPPLY FAN SPLIT NUMBER FILTER SECT. CHASSIS “A” (in.) “B” (in.) “C” (in.) CRRFCURB354A00 LOW 28 4 ft 344.36 241.86 49.50 CRRFCURB355A00 HI 40 4 ft 359.45...
Page 12 Roof Curb Condenser Support UNIT SIZE DIM. DIM. DIM. DIM. COND COILS 2V COND COIL 3V NOMINAL TONS 75 ALL — 129.50 10.98 131.75±0.75 133.50 90 STD EFFICIENCY — 129.50 10.98 131.75±0.75 133.50 90 HIGH EFFICIENCY — 181.50 10.36 183.75±0.75 183.25 105 STD EFFICIENCY —...
Page 13 Fig. 8 — 50N Unit Sizes N, P, Q — without Plenum (75-105 Ton Rooftop Unit)
Page 14 SIZE SUPPLY FIELD EXTENDED BLANK CONDENSER (TON) USE FILTER CHASSIS SECTION # OF V’S (in.) (in.) (in.) (in.) (in.) (in.) (in.) (in.) (in.) (in.) TYPE SECTION 389.65 214.170 36.32 177.02 60.50 390.89 202.75 119.76 — 34.76 450.15 274.670 36.32 237.52 58.00 451.39 263.25 119.76 —...
Page 15 Fig. 9 — 50N Unit Sizes R, S, T — without Plenum (120-150 Ton Rooftop Unit)
Page 16 SUPPLY FIELD USE SIZE (TON) EXTENDED BLANK CONDENSER FILTER CHASSIS SECTION # OF V’S (in.) (in.) (in.) (in.) (in.) (in.) (in.) (in.) (in.) (in.) TYPE SECTION 420.58 236.32 39.39 186.86 58.00 421.82 227.72 119.76 — 39.76 481.08 296.82 39.39 247.36 58.00 482.32 288.22 119.76 —...
Page 17 Fig. 10 — 50N Unit Sizes R, S, T — with Plenum, with Electric Heat, with or without Blank Section; with Plenum, without Electric Heat, without Blank Section (120-150 Ton Rooftop Unit)
Page 18 FIELD USE BLANK EXTENDED 2-PIECE CONDENSER SIZE (TON)EFF FILTER SECTION CHASSIS UNIT # OF V’S (in.) (in.) (in.) (in.) (in.) (in.) (in.) (in.) SECTION (ft) 458.04 274.35 186.86 459.28 227.68 119.76 — 273.29 581.29 397.60 205.11 582.53 245.93 119.76 — 296.54 629.54 445.85...
Page 19 Fig. 11 — 50N Unit Sizes N, P, Q — with Plenum, with Electric Heat, with or without Blank Section; with Plenum, without Electric Heat, without Blank Section (75-105 Ton Rooftop Unit)
Page 20 SIZE SUPPLY FIELD BLANK EXTENDED 2-PIECE CONDENSER (TON) USE FILTER SECTION CHASSIS UNIT # OF V’S (in.) (in.) (in.) (in.) (in.) (in.) (in.) (in.) TYPE SECTION (ft) 433.11 249.42 177.02 434.35 202.75 119.76 — 248.36 556.36 372.67 195.27 557.60 221.00 119.76 —...
Page 21 Fig. 12 — 50N Unit Sizes R, S, T — with Plenum, without Electric Heat, with Blank Section (120-150 Ton Rooftop Unit)
Page 22 FIELD USE BLANK EXTENDED 2-PIECE CONDENSER SIZE (TON) EFF FILTER SECTION CHASSIS UNIT # OF V’S (in.) (in.) (in.) (in.) (in.) (in.) (in.) (in.) SECTION (ft) 506.29 322.60 186.86 507.53 227.68 119.76 — 321.54 554.54 370.85 186.86 555.78 227.68 119.76 —...
Page 23 Fig. 13 — 50N Unit Sizes N, P, Q — with Plenum, without Electric Heat, with Blank Section (75-105 Ton Rooftop Unit)
Page 24 SIZE SUPPLY FIELD USE BLANK EXTENDED 2-PIECE CONDENSER (TON) FILTER SECTION CHASSIS UNIT # OF V’S (in.) (in.) (in.) (in.) (in.) (in.) (in.) (in.) TYPE SECTION (ft) 90-105 STD EFF HIGH 568.70 385.01 177.02 569.94 241.84 119.76 185.75 383.95 533.36 297.67 177.02 534.60 202.75 171.76 —...
Page 25 Table 1 — Physical Data 50N — 75-150 Tons Nominal Capacity BASE UNIT (Model Number - Pos. 6) † NOMINAL CAPACITY (tons) WEIGHT (lb) Base Unit * 12,000 12,455 12,455 16,170 16,860 17,040 Split Unit - Main Section 9,110 9,565 9,565 12,880 13,570...
Page 26 Table 1 — Physical Data 50N — 75-150 Tons Nominal Capacity (cont) BASE UNIT (MODEL NUMBER - POS. 6) * † NOMINAL CAPACITY (tons) CONDENSER FAN, STANDARD EFFICIENCY Number of Fans Type Prop/Metal Prop/Metal Prop/Plastic Prop/Plastic Prop/Metal Prop/Plastic Diameter (in.) 30.5 30.5 30.5...
Page 27 Table 1 — Physical Data 50N — 75-150 Tons Nominal Capacity (cont) BASE UNIT (MODEL NUMBER - POS. 6) * † NOMINAL CAPACITY (tons) OPTIONAL POWER EXHAUST Power Exhaust Diameter (in.) DWDI Wheel and Blade Type DWDI Forward Curve Forward Curve Maximum Allowable Cfm 42,000 60,000...
Page 28 Table 1 — Physical Data 50N — 75-150 Tons Nominal Capacity (cont) BASE UNIT (MODEL NUMBER - POS. 6) * † NOMINAL CAPACITY (tons) MERV 8 MERV 8 Type (Standard) (Optional) MERV 14 MERV 14 Outside Air Filters Size…. Qty 16"...
Page 29 Table 2 — Operating Weights of Options and Accessories (lb) 50N UNIT SIZE (TON NOMINAL CAPACITY)* OPTION OR ACCESSORY (FOR MODEL NUMBER POS. 6) N (75) P (90) Q (105) R (120) S (130) T (150) Economizer Filters 2 in. MERV 7 4 in.
Page 30 Table 2 — Operating Weights of Options and Accessories (lb) (cont) 50N UNIT SIZE (TON NOMINAL CAPACITY)* OPTION OR ACCESSORY (for MODEL NUMBER Pos. 6) (75) (90) (105) (120) (130) (150) Supply/PE/Return Motor Includes VFD 460 Volt TEFC 7.5 Hp 10 Hp 15 Hp 20 Hp...
Page 31 Table 3 — Units with Discharge Plenum Supply Fan and Drive Data MOTOR DRIVE DRIVEN MOTOR MOTOR BUSHING BUSHING QTY OF FAN SPEED SHAFT SHAFT SHEAVE SHEAVE BELTS TYPE TYPE BELTS (rpm) SIZE (in.) SIZE (in.) BROWNING BROWNING 1770 2.125 1800 4B5V70 B 2 1/8...
Page 32 Table 6 — Refrigerant Charge CHARGE (LB) CHARGE (LB) UNIT SIZE UNITS WITHOUT HUMIDI-MIZER UNITS WITH HUMIDI-MIZER ® ® UNIT CONFIGURATION (NOMINAL CAPACITY, TONS) SYSTEM SYSTEM Circuit A Circuit B Circuit A Circuit B Standard Capacity Standard Efficiency 46.5 52.6 46.5 69.6 High Capacity Standard Efficiency...
Page 33 Design supply duct strong enough to handle expected static pres- Step 6 — Install Field-Fabricated Ductwork sures. Field-fabricated ductwork for horizontal supply/return units must be attached to the unit. WARNING Step 7 — Rig Unit PERSONAL INJURY HAZARD Do not drop unit; keep upright. Use spreader bars over the unit to prevent sling or cable damage.
Page 34 Econ, Bar Rel, Standard filters, High Cap Evap, High Efficiency, High Static Supply Fan w/ largest motor, High Static PE w/ largest motor, No Heat, No Post section, No Humidimizer, No Extended Chassis, No Split, No Field Filter Section Econ, Bar Rel, Standard filters, High Cap Evap, High Efficiency, High Static Supply Fan w/ largest motor,...
Page 35 Econ, Bar Rel, Cartridge filters, Hi Cap Evap, High Efficiency, High Static Supply Fan w/ largest motor, Hi Static Return Fan w/ largest motor, High Electric Heat, 8' Blank section w/ post filters, Extended chassis w/ humidimizer, Split, No Field filter section Econ, Bar Rel, Cartridge filters, Hi Cap Evap, High Efficiency, High Static Supply Fan w/ largest motor,...
Page 36 High Efficiency, High Static Supply Fan w/ largest motor, Hi Static Return Fan w/ largest motor, High Electric Heat, 8' Blank section w/ post filters, Extended chassis w/ humidimizer, Split, No Field filter section Econ, Bar Rel, Cartridge filters, Hi Cap Evap, High Efficiency, High Static Supply Fan w/ largest motor,Hi Static Return Fan w/ largest motor, High gas heat, 8' Blank...
Page 37 Cond End Return End NOMINAL CORNER WEIGHTS (lb) CENTER OF GRAVITY CAPACITY TOTAL (lb) A (in.) B (in.) (tons) 3,958 3,880 4,590 4,500 16,927 238.3 67.2 4,238 4,154 5,044 4,945 18,382 269.4 67.2 4,330 4,245 5,200 5,098 18,873 270.5 67.2 50 Series Non-Split 5,257 5,153...
Page 38 SHIPPING SUPPORT STRAPS FILTERS OUTDOOR HOODS (BOTH SIDES) PACKAGING Fig. 23 — Packaging Locations Fig. 21 — Condensate Drain Connection SEALANT 3 IN DRAIN INSIDE OF BASE RAIL A MIN. UNIT CURB HOOD SUPPORTS (BOTH SIDES) UNIT BASE RAIL DRAIN PIPE IS FIELD SUPPLIED 7-in.
Page 39 Step 11 — Make Field Electrical Connections IMPORTANT: All units have factory installed variable fre- quency drives (VFD). VFDs generate, use, and can radiate radio frequency energy. If units are not installed and used in SEAL STRIP accordance with these instructions, they may cause radio in- terference.
Page 40 CAUTION Use care when drilling into corner post to avoid dam- age to condenser coil. a48-8729 RECOMMENDED FIELD-SUPPLIED DISCONNECT LOCATION Fig. 27 — Disconnect Location Operating Voltage This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%. Operating voltage to the unit must be within the voltage range in- dicated on the unit nameplate.
Page 41 114.8 85.67 132.0 106.0 95.4 NOTE: Extensive motor and electrical testing on the Carrier units has LEGEND ensured that the full horsepower range of the motor can be utilized with — Brake Horsepower confidence. Using fan motors up to the horsepower ratings shown in the —...
Page 42 LEGEND — Accessory — Ground ACC FSS — Accessory Fan Status Switch — Low Volume Terminal — Air Pressure Switch — Main Base Board — Circuit Breaker PPSS — Plenum Pressure Safety Switch — Controls Expansion Module RACFM — Return Air CFM —...
Page 43 Step 14 — Remove PE Shipping Bracket Screws Optional (PE) power exhaust shipping bracket screws must be re- moved from each corner of the fan sled before starting unit. To remove shipping bracket screws, raise fan sled by turning adjusting bolt counterclockwise until spring is compressed slightly.
Page 44 the main unit section. Slide base rail and top rail guides from Step 18 — Install Unit Accessories main unit section rails partially into return section rails. For applications requiring accessories, the following packages are available. Install tar tape on edge of main unit base rails to seal base rail splice.
Page 45 Table 9 — 75-105 Nominal Ton Units Parts List ITEM COMPONENT NUMBER QUANTITY COMPONENT NAME COMPONENT QUALIFIER 48NG501939 RAIL,MOUNTING SPLIT,BASE,GUIDE 48NG501935 ROD,THREADED -10 UNC 2A 30-in. L 48NG501937 WASHER,PLATE -in. LRT SPLIT AU02AB361 WASHER,FLAT AT11AB361 NUT,HEAVY HEX 48NG501938 BRACKET,TIE LRT SPLIT TOP AL48AM307 SCREW,HEXHD SR 48NG501936...
Page 46 ROOF COVER TOP RAIL GUIDES BASE RAIL GUIDES Fig. 38 — Roof Cap and Top Cover Removal Fig. 35 — Base and Top Rail Guide Locations L BRACKETS BASE RAIL GUIDE Fig. 36 — Base Rail Guide Fig. 39 — L Bracket Removal TOP RAIL GUIDE INSTALL TAR TAPE ON...
Page 47 L BRACKETS Fig. 44 — L Bracket Installation Fig. 41 — Secure Base Rails TOP CAPS END CAPS COVER Fig. 45 — Main Unit and Return Section Fig. 42 — Top Rail Brackets Top Cover Assemblies SEE DETAIL A BASEPAN JOINT/COVER DETAIL A RUN VFD POWER WIRES THROUGH THIS BUSHING,...
Page 48 VFD WITH BYPASS DETAIL NN VFD WITHOUT BYPASS SEE DETAIL NN DETAIL NN VFD DETAILS Fig. 47 — Return Section Component Locations Table 11 — Air Pressure Tube Connections OPTION CONTROL TUBE NUMBER Return Air Fan RACFM Control PPSS 4, 5 and 6 Power Exhaust Fan with CFM Sensor EACFM Control 5 and 6...
Page 49 Variable Air Volume (VAV) units are: Fig. 51. • thermostats NOTE: Only Carrier sensors may be used for standard T-55 space • differential enthalpy sensor averaging. Sensors must be used in multiples of 1, 4, and 9 only, with total sensors wiring not to exceed 1000 ft.
Page 50 HEAT INTERLOCK RELAY (VAV UNITS ONLY) Figures 53-63 contain wiring information on the following features: The heat interlock relay is not necessary for digital air volume • heat interlock relay (Fig. 52) applications. • outdoor air enthalpy switch (Fig. 53) Variable air volume (VAV) units using morning warm-up and/or occupied heating require that room terminals be controlled to a po- •...
Page 51 RELAY 5 Fig. 52 — Heat Interlock Relay Wiring FIELD INSTALLED (FIELD SUPPLIED) JUMPER WHEN ENTHALPY SWITCH NOT USED Fig. 53 — Outdoor Air Enthalpy Switch Wiring TB201 Fig. 54 — CO Space Sensor Wiring...
Page 52 FILTER STATUS - RETURN SWITCH 180 OHM AN 5 FILTER PRESSURE RETURN FILTER STATUS - POST FILTER 180 OHM AN 6 FILTER PRESSURE - POST FILTER AN 7 Fig. 55 — Filter Status Wiring Fig. 56 — Fan Status Switch Wiring...
Page 53 TB203 MIXED AIR HUMIDITY 4 - 20 ma ACCSY PL29-1 OA HUMIDITY 24VDC 4 - 20 ma PL29-2 ACCSY TB202 24VDC SPACE HUMIDITY 4 - 20 ma ACCSY PL37-5 RETURN HUMIDITY 24VDC 4 - 20 ma AN10 PL37-6 ACCSY Fig. 57 — Space and Return Air Humidity Sensor Wiring Fig.
Page 54 TB201 TB201 PL45-1 PL45-2 PL45-3 PL45-6 PL45-5 PL45-4 Fig. 59 — Return Air Smoke Detector Wiring FIRE SHUTDOWN TB201 Fig. 60 — Fire Shutdown Wiring...
Page 55 TB 202 RCB J4 Fig. 61 — Purge, Evacuation, and Pressurization Wiring TB201 Fig. 62 — CCN Connections...
Page 56 Wire the CCN to the screw terminals on the COMM board as Carrier Comfort Network ® (CCN) Interface follows: The 50N Series units can be connected to the CCN system if de- sired. The communication bus wiring is supplied and installed in a.
Page 57 BT485 TERMINATOR BACNET CONNECTION POWER LED Tx1 LED Rx1 LED BACNET Tx2 LED BAUD RATE Rx2 LED DIP SWITCHES ADDRESS ROTARY SWITCHES RUN LED ERROR LED Fig. 63 — UPC Open Controller Fig. 64 — Open System Network Wiring...
Page 58 Fig. 65 — BT485 Installation MS/TP WIRING RECOMMENDATIONS • closing the power exhaust dampers (if installed as option) • shutting off the power exhaust fans (if installed as option) Recommendations are shown in Tables 13 and 14. The wire jacket and UL temperature rating specifications list two acceptable alter- This allows the space to be over pressurized relative to adjacent natives.
Page 59 Table 13 — MS/TP Wiring Recommendations SPECIFICATION RECOMMENDATION Cable Single twisted pair, low capacitance, CL2P, 22 AWG (7x30), TC foam FEP, plenum rated cable Conductor 22 or 24 AWG stranded copper (tin plated) Insulation Foamed FEP 0.015 in. (0.381 mm) wall 0.060 in. (1.524 mm) O.D. Color Code Black/White Twist Lay...
Page 60 © 2021 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500195-01 Printed in U.S.A. Form 50N-6SI Pg 60 1-2021 Replaces: 50N-5SI...

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