Bryant 601A - Manual (Page 21)

—21—
APPLICATION DATA
Condensate trap — A 2-in. condensate trap must be field
supplied.
Ductwork — Secure downflow discharge ductwork to roof curb.
For horizontal discharge applications, attach ductwork to unit
with flanges.
To convert a unit to downflow discharge — Units are
equipped with factory-installed inser ts in the down-flow
openings. Remove the inserts similar to removing an electrical
knock-out.
Maximum cooling airflow — To minimize the possibility of
condensate blow-off from the evaporator, airflow through the
units should not exceed 450 cfm/ton.
Minimum cooling airflow — The minimum cooling airflow is
350 cfm/ton.
Minimum cooling ambient operating temperature — All
standard units have a minimum ambient operating temperature of
40°F. With accessory low ambient temperature kit, units can
operate at temperatures down to 0°F.
452 = 5 v
457 = 7 v
455 = 2 v
LEGEND
FLA — Full Load Amps
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
RLA
— Rated Load Amps
NOTES:
1. In compliance with NEC (National Electrical Code) requirements
for multimotor and combination load equipment (refer to NEC
Articles 430 and 440), the overcurrent protective device for the
unit shall be Power Supply fuse . The CGA (Canadian Gas
Association) units may be fuse or circuit breaker.
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table,
determine size from NEC.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%. Use the following formula to determine
the percentage of voltage imbalance.
% Voltage imbalance
max voltage deviation from average voltage
= 100 x
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
452 + 464 + 455
Average Voltage =
3
1371
=
3
= 457
Determine maximum deviation from average voltage.
(AB) 457
(BC) 464
(AC) 457
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
457
= 1.53%
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.
®
*Heater capacity (KW) based on heater voltage of 208v, 240v, & 480v.
If power distribution voltage to unit varies from rated heater voltage,
heater KW will vary accordingly.
ELECTRICAL DATA LEGEND
(See Data on Page 22)
1” MIN.
2” MIN.
TRAP
OUTLET