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United Technologies Carrier WeatherMaker 50TC A08 Series Installation Instructions Manual

Single package rooftop cooling only with puron (r-410a) refrigerant
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50TC units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speed
indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of
2018.
50TC units for installation outside the United States may or may not contain use of the SAV 2-speed indoor
fan control system as they are not required to comply with the U.S. Department of Energy (DOE) efficiency
standard of 2018.
For specific details on operation of the Carrier SAV 2-speed indoor fan system refer to the Variable
Frequency Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, and
Troubleshooting manual.
CONTENTS
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . 1-10
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . . ..2
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-78
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . . 10
Step 3 - Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 4 - Provide Unit Support . . . . . . . . . . . . . . . . . . 11
Step 5 - Field Fabricate Ductwork. . . . . . . . . . . . . . 14
Step 6 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . 15
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Step 8 - Install Outside Air Hood . . . . . . . . . . . . . . . 16
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Electric Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
®
®
Economizer Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
RTU Open Controller System . . . . . . . . . . . . . . . . . . . 63
Field Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Communication Wiring - Protocols . . . . . . . . . . . . 71
Local Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Outdoor Air Enthalpy Control . . . . . . . . . . . . . . . . . . . 73
Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Step 12 - Install Accessories. . . . . . . . . . . . . . . . . . . 77
Step 13 - Check Belt Tension . . . . . . . . . . . . . . . . . . 77
Pre Start-Up and Start-Up . . . . . . . . . . . . . . . . . . . . . . . 78
START-UP CHECKLIST . . . . . . . . . . . . . . . . . CL-1, CL-2
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500160-01
Single Package Rooftop Cooling Only
Installation Instructions
Page
Printed in U.S.A.
Form 50TC-8-16-01SI
®
with Puron
(R-410A) Refrigerant

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, main-
tenance, 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 quali-
fied installer or agency must use factory-authorized kits or ac-
cessories when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when
installing.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and have a
fire extinguisher available. Read these instructions thoroughly
and follow all warnings or cautions attached to the unit. Con-
sult local building codes and appropriate national electrical
codes (in USA, ANSI/NFPA 70, National Electrical Code
(NEC); in Canada, CSA C22.1) for special requirements.
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 per-
sonal injury.
Understand the signal words DANGER, WARNING, CAU-
TION, 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 signi-
fies hazards which could result in personal injury or death.
CAUTION is used to identify unsafe practices, which may re-
sult in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in en-
hanced installation, reliability, or operation.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect gas piping from unit when leak testing at pres-
sure greater than 0.5 psig (3450 Pa). Pressures greater than
0.5 psig (3450 Pa) will cause gas valve damage resulting in
hazardous condition. If gas valve is subjected to pressure
greater than 0.5 psig (3450 Pa), it must be replaced before
use. When pressure testing field-supplied gas piping at
pressures of 0.5 psig (3450 Pa) or less, a unit connected to
such piping must be isolated by closing the manual gas
valve.
Pg 1
WeatherMaker
50TC08-16
WARNING
12-17
Replaces: 50TC-8-14-02SI
50TC-14SI
®

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Summary of Contents for United Technologies Carrier WeatherMaker 50TC A08 Series

  • Page 1: Table Of Contents

    ® WeatherMaker 50TC08-16 Single Package Rooftop Cooling Only ® with Puron (R-410A) Refrigerant Installation Instructions 50TC units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speed indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of 2018.

  • Page 2: Rated Indoor Airflow (Cfm)

    WARNING CAUTION ELECTRICAL SHOCK HAZARD CUT HAZARD Failure to follow this warning could cause personal injury Failure to follow this caution may result in personal injury. or death. Sheet metal parts may have sharp edges or burrs. Use care Before performing service or maintenance operations on and wear appropriate protective clothing, safety glasses and unit, always turn off main power switch to unit and install gloves when handling parts and servicing air-conditioning...
  • Page 3 Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Packaging & Seismic Compliance 50 - Electric Heat Packaged Rooftop 0 = Standard 1 = LTL 3 = California Seismic Compliant Label ® Model Series - WeatherMaker 4 = LTL and CA Seismic Compliant Label TC - Standard Efficiency Electrical Options...
  • Page 4 Fig. 2 — Unit Dimensional Drawing — Size 08, 09, 12 Units...
  • Page 5 Fig. 2 — Unit Dimensional Drawing — Size 08, 09, 12 Units (cont)
  • Page 6 Fig. 3 — Unit Dimensional Drawing — Size 14 Unit...
  • Page 7 Fig. 3 — Unit Dimensional Drawing — Size 14 Unit (cont)
  • Page 8 Vertical Connections / Economizer Horizontal Connections / Economizer Fig. 4 — Unit Dimensional Drawing — Size 16 Unit...
  • Page 9 Fig. 4 — Unit Dimensional Drawing — Size 16 Unit (cont)

  • Page 10: Installation

    LOCATION DIMENSION CONDITION 48-in. (1219 mm) Unit disconnect is mounted on panel 18-in. (457 mm) No disconnect, convenience outlet option 18-in. (457) mm Recommended service clearance 12-in. (305 mm) Minimum clearance 42-in. (1067 mm) Surface behind servicer is grounded (e.g., metal, masonry wall) 36-in.

  • Page 11: Step 2 - Plan For Sequence Of Unit Installation

    Table 1 — Operating Weights (50TC 08-14 Units) UNITS LB (KG) 50TC 50TC-_A/RTPF 705 (320) 845 (384) 855 (388) 50TC-_D/RTPF 730 (331) 855 (388) 865 (393) 1075 (489) 1305 (593) 50TC-_D/MCHX 805 (366) 820 (372) 1030 (467) Economizer Vertical 75 (34) 75 (34) 75 (34) 75 (34)
  • Page 12 Fig. 7 — Roof Curb Details - Size 08-14 Units...
  • Page 13 Fig. 8 — Roof Curb Details - Size 16 Unit...

  • Page 14: Step 5 - Field Fabricate Ductwork

    ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR SLAB MOUNT) — A non-combustible sleeper rail can be CAUTION used in the unit curb support area. If sleeper rails cannot be PROPERTY DAMAGE HAZARD used, support the long sides of the unit with a minimum of 3 equally spaced 4-in.

  • Page 15: Step 6 - Rig And Place Unit

    If the alternative condensate drain location through the bot- Keep unit upright Step 6 — Rig and Place Unit — tom of the unit is used in conjunction with a retrofit curb, the and do not drop. Spreader bars are not required if top crating is hole in the curb must be moved 12.5 in.

  • Page 16: Step 8 - Install Outside Air Hood

    4. Carefully lift the hood assembly (with metal tray) through the filter access opening and assemble per the steps out- lined in Economizer Hood and Two-Position Damper Hood. Hood Parts Plastic Tie Wrap Qty (2) Fig. 12 — Horizontal Conversion Panels Screws for Metal Tray Step 8 —...

  • Page 17: 50Tc 16 Unit Size

    4. Carefully lift the hood assembly through the filter access opening and assemble per the steps outlined in Econo- mizer Hood and Two–Position Hood section. PANEL INDOOR COIL ACCESS PANEL LEFT HOOD SCREW SIDE 19 1/16” (483mm) 33 3/8” (848mm) HOOD DIVIDER Fig.
  • Page 18 PANEL Hood Parts INDOOR COIL ACCESS PANEL SCREW Plastic Tie Wrap Qty (2) LEFT HOOD Screws for Metal Tray SIDE Qty (2) HOOD DIVIDER Fig. 20 — Two-Position Damper Hood Package Fig. 22 — Economizer Hood Construction Location 3. Remove the shipping tape holding the economizer baro- Economizer Hood and Two-Position Hood metric relief damper in place.

  • Page 19: Step 9 - Install External Condensate Trap And Line

    Step 9 — Install External Condensate Trap Step 10 — Make Electrical Connections The unit has one -in. condensate drain con- and Line — 50TC 08-14 UNIT SIZES nection on the end of the condensate pan and an alternate con- nection on the bottom.
  • Page 20 4. Make sure the NFD shipped from the factory is at OFF position (the arrow on the black handle knob is at OFF). 5. Insert the shaft with the cross pin on the top of the shaft in the horizontal position. 6.
  • Page 21 AB = 224 v BC = 231 v Units Without Disconnect Option AC = 226 v 224 + 231 + 226 Average Voltage = Disconnect Determine maximum deviation from average voltage. 208/230-3-60 (AB) 227 224 = 3 v – 460-3-60 (BC) 231 227 = 4 v –...
  • Page 22 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.
  • Page 23 Central LOW VOLTAGE Terminal Typical CONDUIT Board CONNECTOR Thermostat Connections HIGH VOLTAGE CONDUIT CONNECTOR (Note 2) Fig. 34 — Thru-Base Connection Fittings Check tightness of connector lock nuts before connecting O/B/Y2 electrical conduits. (Note 1) Field-supplied and field-installed liquid-tight conduit con- nectors and conduit may be attached to the connectors on the basepan.

  • Page 24: 50Tc 16 Unit Size

    50TC 16 UNIT SIZE WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Unit cabinet must have an uninterrupted, unbroken electri- cal 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 com- partment, or conduit approved for electrical ground when installed in accordance with NEC (National Electrical...
  • Page 25 codes). Refer to unit informative data plate for MOCP (Maxi- mum Over-current Protection) device size. Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%.
  • Page 26 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. 43). The factory Pwd-CO disconnect is an 80A disconnect. Fuse Switch Units Without Disconnect Option Disconnect Pwd-CO Transformer...
  • Page 27 Installing Weatherproof Cover: A weatherproof while-in- use cover for the factory-installed convenience outlets is now NOTICE/AVIS required by UL standards. This cover cannot be factory- mounted due its depth; it must be installed at unit installation. Convenience Outlet Utilization For shipment, the convenience outlet is covered with a blank Maximum Intermittent Use 15 - Amps Maximum Continuous Use 8 - Amps cover plate.
  • Page 28 2. Install power lines to terminal connections as shown in Fig. 43. Field Control Wiring — The 50TC-16D unit requires an ex- ” ELECTRICAL ternal temperature control device. This device can be a thermo- BULKHEAD stat (field-supplied) or a PremierLink™ controller (available as CONNECTOR factory-installed option or as field-installed accessory, for use on a Carrier Comfort Network...

  • Page 29: Electric Heaters

    bushing near the control box. Route the wire through the bush- DISCONNECT MOUNTING ing and into the bottom left side of the control box after remov- LOCATION ing 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.

  • Page 30: 50Tc 16 Unit Size

    All fuses on 50TC units are 60-A. (Note that all heaters are For CRHEATER128B00-129B00 only — Connect the ORN qualified for use with a 60-A fuse, regardless of actual heater lead from Heater Relay 1 (HR1) to terminal TB4-1. For 2 stage ampacity, so only 60-A fuses are necessary.) heating connect the VIO lead from Heater Relay 3 (HR3) to terminal TB4-2.
  • Page 31 Heater and Supplementary Fuses — When the unit MOCP CONTROL device value exceeds 60-A, unit-mounted supplementary fuses are required for each heater circuit. These fuses are included in BUSHING accessory Single Point Boxes, with power distribution and fuse blocks. SINGLE All fuses on 50TC-*16 units are 60-A.

  • Page 32: Humidi-Mizer

    To connect the Thermidistat device (33CS2PPRH-01): ® Humidi-MiZer System Control Connections 1. Route the Thermidistat multi-conductor thermostat HUMIDI-MIZER — SPACE RH CONTROLLER cable (field-supplied) through the bushing the unit’s louvered end panel (see Fig. 51). NOTE: The Humidi-MiZer system is a factory installed option.
  • Page 33 Fig. 62 — Typical Humidi-MiZer ® Adaptive Dehumidification System Humidistat Wiring 50TC 08-14 Unit Sizes...
  • Page 34 HUMIDISTAT Fig. 63 — Typical Humidi-MiZer Adaptive Dehumidification System Humidistat Wiring 50TC 16 Unit Sizes...

  • Page 35: Economi$Er

    Edge Programable Thermostat Unit CTB THERMOSTAT O/W2/B SRTN Humidi-MiZer™ FIOP *Connection not required. ® Fig. 64 — Typical Rooftop Unit with Humidi-MiZer Adaptive Dehumidification System with ® Edge Pro Thermidistat Device W7220 economizer controller indicates a device fail error on EconoMi$er ®...
  • Page 36 Relay Digital Output Rating at 30 Vac (maximum power 5% to 95% RH non-condensing from Class 2 input only) — 1.5A run: ECONOMIZER MODULE WIRING DETAILS — Use 3.5A inrush at 0.45PF (200,000 cycles) or Fig. 66 and Tables 2 and 3 to locate the wiring terminals for the Economizer module.
  • Page 37 Table 3 — Economizer Module - Right Hand Table 4 — HH57AC081 Sensor Wiring Terminal Blocks Terminations LABEL TYPE DESCRIPTION TERMINAL TYPE DESCRIPTION Top Right Terminal Blocks NUMBER LABEL AUX2 I 24 vac IN The first terminal is not used. S-BUS Communications S-BUS...
  • Page 38 • Press the (Enter) button to display the first item in the 10. Press the (Menu Up/Exit) button to return to the previous currently displayed menu. menu. MENU STRUCTURE — Table 6 illustrates the complete hi- erarchy of menus and parameters for the EconoMi$er ®...
  • Page 39 Table 6 — Menu Structure PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT FIRST STAGE COOLING DEMAND (Y1–IN) ECONO AVAIL YES/NO YES = economizing available; the system can use outside air for free cooling when required FIRST STAGE COOLING RELAY OUTPUT ECONOMIZING YES/NO YES = outside air being used for 1 stage cooling...
  • Page 40 Table 6 — Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT ACT COUNT 1 to 65535 Displays number of times actuator has cycled. 1 cycles equals 180 deg. of actuator movement in any direction. ACTUATOR OK/Alarm (on Alarm Displays ERROR if voltage or torque is below actuator range.
  • Page 41 Table 6 — Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT INSTALL 01/01/10 Display order = MM/DD/YY Setting order = DD, MM, then YY. UNITS DEG F or C Sets economizer controller in degrees Fahrenheit or Celsius EQUIPMENT CONV Conventional or HP...
  • Page 42 Table 6 — Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT MAT T CAL 0.0°F ±2.5 F SUPPLY AIR TEMPERATURE CALIBRATION Allows for the operator to adjust for an out of calibration temperature sensor. OAS T CAL 0.0°F ±2.5 F OUTSIDE AIR TEMPERATURE CALIBRATION...
  • Page 43 Table 6 — Menu Structure (cont) PARAMETER PARAMETER MENU PARAMETER DEFAULT RANGE AND NOTES VALUE INCREMENT SHUTDOWN ACTIVE AUX2 IN is programmed for SHUTDOWN and 24 V has been applied to AUX2 IN terminal. DMP CAL RUNNING DAMPER CALIBRATION ROUTINE RUNNING If DCV Auto enable has been programmed, when the W7220 is complet- ing a calibration on the dampers, this alarm will display.
  • Page 44 Table 7 — Damper Minimum Position Settings and Readings on Checkout Menu DEMAND CONTROLLED VENTILATION FAN SPEED SETPOINTS CHECKOUT SENSOR) MIN POS VMAX–HS MIN POS H VMAX–HS MIN POS L VMAX–LS VENT MIN VMAX–HS VENT MAX VMAX–HS VENT MIN H VMAX–HS VENT MAX H VMAX–LS...
  • Page 45 Table 10 — Enthalpy Operation No DCV (CO Sensor) — 1 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE HIGH 0v/Off 0v/Off MIN POS Closed NONE HIGH 24v/On 0v/Off MIN POS Closed HIGH 24v/On...
  • Page 46 Table 13 — Dry Bulb Operation With DCV (CO Sensor) — 2 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE 0v/Off 0v/Off VENTMIN Closed 24v/On 0v/Off VENTMIN Closed HIGH 24v/On 24v/On VENTMIN Closed...
  • Page 47 ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 70 — Single Enthalpy Curve Boundaries Table 16 — Single Enthalpy and Dual Enthalpy High Limit Curves POINT P1 POINT P2 ENTHALPY TEMP. DRY TEMP. ENTHALPY HUMIDITY HUMIDITY...
  • Page 48 4. Press the button to start the test. 5. The unit pauses and then displays IN PROGRESS. WARNING 6. When the test is complete, DONE appears. Failure to follow this warning could result in personal 7. When all desired parameters have been tested, press the injury, property damage, or death.

  • Page 49: Premierlink™ Controller (Factory Option)

    PremierLink™ Controller (Factory Option) Fig. 71 — PremierLink Controller The PremierLink controller (see Fig. 71) is compatible with The factory-installed PremierLink controller includes the sup- Carrier Comfort Network ® (CCN) devices. This control is de- ply-air temperature (SAT) sensor. The outdoor air temperature signed to allow users the access and ability to change factory- (OAT) sensor is included in the FIOP/accessory EconoMi$er 2 defined settings, thus expanding the function of the standard...
  • Page 50 Fig. 73 — 50TC 16 Control Box Component PremierLink Locations...
  • Page 51 Fig. 74 — Typical PremierLink™ Control Wiring Diagram...
  • Page 52 ® Fig. 75 — Typical PremierLink Control Wiring Diagram with Humidi-MiZer System Option...

  • Page 53: Supply Air Temperature (Sat) Sensor

    NOTE: Refer PremierLink Controller Installation, Start-up, Supply Air Temperature (SAT) Sensor — and Configuration Instructions for complete PremierLink con- FIOP-equipped 50TC unit, the unit is supplied with a supply- troller configuration, operating sequences and troubleshooting air temperature (SAT) sensor (33ZCSENSAT). This sensor is a information.
  • Page 54 Table 19 — Space Sensor Mode (50TC 08-14 Unit Sizes) TB1 TERMINAL FIELD CONNECTION INPUT SIGNAL T55—SEN/T56—SEN Analog (10k thermistor) RMTOCC Discrete, 24VAC T55—SEN/T56—SEN Analog (10k thermistor) CMPSAFE Discrete, 24VAC T56—SET Analog (10k thermistor) Discrete, 24VAC LOOP—PWR Analog, 24VDC Discrete, 24VAC IAQ—SEN Analog, 4-20mA FILTER...
  • Page 55 Table 21 — Thermostat Mode (50TC 08-14 Unit Sizes) TB1 TERMINAL FIELD CONNECTION INPUT SIGNAL RAT SEN Analog (10k thermistor) Discrete, 24VAC RAT SEN Analog (10k thermistor) Discrete, 24VAC — — Discrete, 24VAC LOOP—PWR Analog, 24VDC Discrete, 24VAC IAQ—SEN Analog, 4-20mA Discrete, 24VAC IAQ—COM/OAQ—COM/RH—COM Analog, 4-20mA...
  • Page 56 SPACE SENSORS (UNIT SIZES 08-14) — The Premier- Link controller is factory-shipped configured for Space Sensor Mode. A Carrier T-55 or T-56 space sensor must be used. T-55 space temperature sensor provides a signal of space tempera- ture to the PremierLink controller. T-56 provides same space temperature signal plus it allows for adjustment of space tem- perature setpoints from the face of the sensor by the occupants.
  • Page 57 J6-7 J6-6 Jumper RED(+) WHT(GND) CCN COM BLK(-) J6-5 Fig. 84 — PremierLink Controller T-56 Sensor BRN (GND) SENSOR WIRING BLU (SPT) CONNECT THERMOSTAT (UNIT SIZES 08-14) — A 7- wire thermostat connection requires a 24-v power source and a common connection.

  • Page 58: Economizer Controls

    SPACE THERMOSTAT THERMOSTAT J4-12 J4-10 0-10VDC J4-8 SIG COM 4-20mA J4-6 ALARM RELAY J4-4 CONTACTS H G 24 VAC THERMOSTAT 24 VDC 8 7 6 5 4 3 2 1 Fig. 86 — Space Thermostat Connections If the 50TC-D16 unit has an economizer system and free- cooling operation is required, a sensor representing Return Air Temperature must also be connected (field-supplied and in- stalled).
  • Page 59 Wiring the Indoor Air Quality Sensor (Unit Size 16) — each sensor, use two 2-conductor 18 AWG (American Wire OAQ Sensor/RH Sensor Gage) twisted-pair cables (unshielded) to connect the separate J5-2 isolated 24 vac power source to the sensor and to connect the sensor to the control board terminals.
  • Page 60 2. Connect a field-supplied BLACK wire to the sensor screw terminal marked Vin. 3. Connect a field-supplied RED wire into the sensor screw terminal marked Io. 4. Connect the field-supplied RED wire from the sensor to MOUNTING TB1-13. HOLES WIRING 5.
  • Page 61 PremierLink™ controller can monitor return filter status in Connect one side of the switch’s NO contact set to CTB’s two ways: By monitoring a field-supplied/installed filter pres- THERMOSTAT-R terminal. Connect the other side of the NO sure switch or via supply fan runtime hours. contact set to TB3-8.
  • Page 62 required. Do not run communication wire in the same conduit as or next to any AC voltage wiring. Power Exhaust The communication bus shields must be tied together at each system element. If the communication bus is entirely J8-3 within one building, the resulting continuous shield must be connected to ground at only one single point.

  • Page 63: Rtu Open Controller System

    Carrier’s i-Vu Open network, or a Third Party Building Auto- The RTU Open ® RTU Open Controller System — mation System (BAS). On-board DIP switches allow you to se- controller is factory-mounted in the 50TC unit’s main control lect your protocol (and baud rate) of choice among the four box (see Fig.
  • Page 64 Fig. 106 — Typical RTU Open Controller Wiring Diagram — 50TC 08-14 Size Units...
  • Page 65 Fig. 107 — Typical RTU Open Controller Wiring Diagram — 50TC 16 Size Unit...
  • Page 66 Fig. 108 — Typical RTU Open Controller Wiring Diagram with ® Humidi-MiZer System Option — 50TC 08-14 Size Units...
  • Page 67 Fig. 109 — Typical RTU Open Controller Wiring Diagram with ® Humidi-MiZer System Option — 50TC 16 Size Units...
  • Page 68 Table 25 — RTU Open Controller Inputs and Outputs BACNET OBJECT CONNECTION PIN POINT NAME TYPE OF I/O CHANNEL DESIGNATION NAME NUMBER(S) DEDICATED INPUTS zone_temp AI (10K Thermistor) J20—1 & 2 Analog Input 10 Space Temp / Zone Temp sa_temp AI (10K Thermistor) J2—1 &...

  • Page 69: Field Connections

    Outdoor air management functions can be enhanced with field-installation of these accessory control devices: J20-1 Enthalpy control (outdoor air or differential sensors) Space CO sensor Outdoor air CO sensor J20-2 Field connections for accessory Field Connections — Jumper sensors and input devices are made the RTU Open controller, at plugs J1, J2, J4, J5, J11 and J20.
  • Page 70 mounting the sensor where it is influenced by the supply air; SPACE RELATIVE HUMIDITY SENSOR OR HUMIDI- the sensor gives inaccurate readings if the supply air is blown STAT directly onto the sensor or if the supply air does not have a Humidi-MiZer ®...

  • Page 71: Communication Wiring - Protocols

    Fan Status The fan status accessory is a field-installed ac- — cessory. This accessory detects when the indoor fan is blowing J4-1 or J4-4 + 24 VDC air. When installing this accessory, the unit must be configured SUPPLY VOLTAGE  ...

  • Page 72: Local Access

    SW3 Protocol Selection PROTOCOL Select BACnet MS/TP (Master) Unused Select Baud Baud Select Modbus (Slave) Unused Select Baud Baud N2 (Slave) Unused LonWorks Unused NOTE: DS = Dip Switch COMM BACnet MS/TP SW3 example shown OPTION Baud Rate Selections SET TO PORT SET TO MSTP 38.4k...

  • Page 73: Outdoor Air Enthalpy Control

    Access Port LOCAL ACCESS RNET PORT Connect to +12 DVC Rnet- computer’s Rnet+ CR2032 USB port Connect to UI-10 the Local UI-11 Access port USB Link Kit RTU Open Controller Fig. 120 — PC Running Field Assistant Table 26 — LEDs The LEDs on the RTU Open Controller show the status of certain functions If this LED is on...

  • Page 74: Smoke Detectors

    DIFFERENTIAL ENTHALPY CONTROL — Differential cover, a sampling tube inlet and an exhaust tube. The sampling enthalpy control is provided by sensing and comparing the out- tube (when used) and exhaust tube are attached during installa- side air and return air enthalpy conditions. Install the outdoor tion.
  • Page 75 RETURN AIR WITHOUT ECONOMIZER — The sam- pling tube is located across the return air opening on the unit basepan. The holes in the sampling tube face downward, into the return air stream. The sampling tube is connected via tub- ing to the return air sensor that is mounted on a bracket high on the partition between return filter and controller location.
  • Page 76 Step 1 Step 2 Step 3 Fig. 127 — Completing Installation of Return Air Smoke Sensor ADDITIONAL APPLICATION DATA — Refer to the Ap- plication Data sheet titled Factory Installed Smoke Detectors for Small and Medium Rooftop Units 2 to 25 Tons for discus- sions on additional control features of these smoke detectors including multiple unit coordination.

  • Page 77: Step 11 - Adjust Factory-Installed Options

    Unit Without Economizer or Economizer 2 Position Damper 2 Position Damper Fig. 129 — EconoMi$er ® IV Wiring • Thermostat / Sensors Step 11 — Adjust Factory-Installed Options • CO sensor SMOKE DETECTORS — Smoke detector(s) will be con- • DDC interface (PremierLink controller) nected at the Controls Connections Board, at terminals marked •...

  • Page 78: Pre Start-Up And Start-Up

    BELT TENSION METHOD — Requires belt tension gauge that measures tension in belt in units of lbs force. BLOWER PULLEY V-BELT MOTOR PULLEY MOTOR BELT DEFLECTION FORCE (LBS) BELT SMALLEST UNNOTCHED CROSS SHEAVE NOTCHED BELTS BELTS SECTION DIAMETER USED USED MOUNTING MOTOR MOUNTING 3.0-3.6...

  • Page 79: Start-Up Checklist

    START-UP CHECKLIST (Remove and use for job file) NOTE: To avoid injury to personnel and damage to equipment or property when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sec- tions of this Installation Instructions document.
  • Page 80 III. HUMIDI-MIZER SYSTEM START-UP STEPS 1. CHECK CTB FOR JUMPER 5, 6, 7  JUMPER 5, 6, 7 MUST BE CUT AND OPEN 2. OPEN HUMIDISTAT CONTACTS  3. START UNIT IN COOLING (CLOSE Y1)  OBSERVE AND RECORD A. SUCTION PRESSURE _____________ PSIG B.

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