Step 14 - Adjust Factory- -Installed Options; Step 15 - Install Accessories - Carrier 48LC Series Installation Instructions Manual

Legend and Notes for Tables 6 and 7
LEGEND:
BD --- Belt drive
indoor fan motor
BRKR --- Circuit breaker
CO --- Convenient outlet
DD --- Direct drive
indoor fan motor
DISC --- Disconnect
FLA --- Full load amps
IFM --- Indoor fan motor
LRA --- Locked rotor amps
MCA --- Minimum circuit amps
MOCP --- MAX FUSE or HACR Breaker
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
Step 14 — 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.
Step 15 — Install Accessories
Available accessories include:
Curb
Thru- - base connection kit (must be installed before unit
is set on curb)
EconoMi$er X (with control)
EconoMi$er2 (without control/for external signal)
Power Exhaust
Differential dry- - bulb sensor (EconoMi$er2)
Outdoor enthalpy sensor
Differential enthalpy sensor
CO2 sensor
Louvered hail guard
Phase monitor control
Refer to separate installation instructions for information
on installing these accessories.
average voltage
47 47
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
(224 + 231 + 226)
Average Voltage =
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
= 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.
—
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. Download the latest versions
from HVAC Partners (www.hvacpartners.com).
681
=
3
4
227