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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Image 32
Bryant 548J*14D installation instructions Adjust Factory-Installed Options, EconoMi$er IV Occupancy Switch

548J*14D specifications

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