Bryant 548J*14D Adjust Factory-Installed Options, EconoMi$er IV Occupancy Switch

Page 32

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

PE

---

Power exhaust

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 de- termine the percentage of voltage imbalance.

max voltage deviation from average voltage

% Voltage Imbalance = 100 x

average voltage

Example: Supply voltage is 230-3-60

AB = 224 v

BC = 231 v

AC = 226 v

(224 + 231 + 226)

681

Average Voltage =

 

=

 

 

 

3

3

=227

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

4

 

227

 

 

 

= 1.76%

 

This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

Economizer

2 Position Damper

Unit Without Economizer or

2 Position Damper

 

 

C10333

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.

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.

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Contents Installation Instructions Safety Considerations Unit Dimensional Drawing Size 14 Unit Service Clearance Dimensional Drawing Plan for Unit LocationProvide Unit Support Plan for Sequence of Unit InstallationInspect Unit Roof Curb Details Rig and Place Unit For Units with Accessory Electric HeatersField Fabricate Ductwork Convert to Horizontal and Connect Ductwork when required Install Outside Air HoodEconomizer Hood Removal and Setup Factory Option Positioning on CurbDamper Assembly Install External Condensate Trap and Line Economizer Hood and Two-Position HoodField Power Supply Make Electrical ConnectionsMounting Position for Field Disconnects Over 100A Units Without Factory-Installed Disconnect Units with Factory-Installed DisconnectUnit Powered Convenience Outlet Wiring Field Control Wiring Factory-Option Thru-Base ConnectionsThermostat Units without Thru-Base ConnectionsHeat Anticipator Settings Unit without Thru-Base Connection KitHeater Low-Voltage Control Connections Single Point BoxesHeater and Supplementary Fuses Differential Enthalpy Control Outdoor Air Enthalpy Control PNO 33CSENTHSWReturn Air Enthalpy Sensor RTU-MP Control System RTU-MP System Control Wiring Diagram Supply Air Temperature SAT Sensor RTU-MP Controller Inputs and OutputsOutdoor Air Temperature OAT Sensor Space Temperature SPT SensorsField Connections EconoMi$er2RTU-MP T-56 Sensor Connections Indoor Air Quality CO2 sensorWeatherproof enclosure Connecting Discrete InputsOutdoor Air Quality Sensor PNO 33ZCSENCO2 plus Communication Wiring Protocols Local AccessRTU-MP Troubleshooting GeneralLEDs LEDs on the RTU-MP show the status of certain functionsSmoke Detectors SystemController SensorReturn Air with Economizer Smoke Detector LocationsSupply Air Completing Installation of Return Air Smoke Sensor Return Air Detector Shipping PositionUnit Wire/Fuse or Hacr Breaker Sizing Data NonePwrd C.O Adjust Factory-Installed Options EconoMi$er IV Occupancy SwitchInstall Accessories Pre-Start and Start-Up548J*14D 548J*14D Catalog No. II548J---07

548J*14D specifications

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