Bryant 549C manual Application Data, Condenser Coil Protection

APPLICATION DATA

1.OUTDOOR INSTALLATION — Units approved for outdoor installation only.

2.DUCTWORK — Secure vertical discharge ductwork to roof curb. For horizontal discharge applications, either attach ductwork to unit, or use field-supplied flanges attached to the horizontal discharge openings and attach all ductwork to flanges.

3.HORIZONTAL ECONOMI$ERIV — A field-installed acces- sory is available for horizontal discharge applications. Field- installed power exhaust accessory also available for vertical or horizontal EconoMi$erIV applications.

4.THRU-THE-BOTTOM POWER CONNECTIONS — For applications requiring thru-the-bottom connections, Bryant accessory thru-the-bottom package must be purchased to ensure proper connections.

5.THERMOSTAT — Use of 2-stage heating and cooling ther- mostat is recommended for all units. A 2-stage cooling ther- mostat is required on units with accessory economizer to provide integrated cooling. A two-stage thermostat is required for all size 090-180 units.

6.HEATING-TO-COOLING CHANGEOVER — All units are automatic changeover from heating to cooling when auto- matic changeover thermostat and subbase are used.

7.AIRFLOW — Units are draw-thru on cooling and blow-thru on heating.

8.MAXIMUM AIRFLOW — To minimize the possibility of con- densate blow-off from indoor coil, airflow through units should not exceed 500 cfm/ton.

9.MINIMUM AIRFLOW — For cooling, minimum airflow is 300 cfm/ton. For 548F units with electric heating, the required minimum cfm is 900 for 548F036; 1200 for 548F048; 1500 for 548F060; 1800 for 548F072; 2250 for 548F090; 2500 for 548F102; and 3000 for 548F120, with the following exceptions:

UNIT	UNIT	HEATER	UNIT	REQUIRED
				MINIMUM
548F	VOLTAGE	kW	CONFIGURATION
				CFM
	208/230	42.4	Horizontal	3200
120	208/230	50.0	Horizontal	3200
	460	50.0	Horizontal	3200
			or
			Vertical
		17.0	Horizontal	2800
090-120	575	34.0	or	2350
			Vertical

For 542J, 549B, and 549C units with electric heating, required minimum cfm is 600 for 549C024, 900 for 549B/C036, 1200 for 549B/C048, 1500 for 549B/C060, 1700 for 549B072, 2250 for 549B090, 3000 for 549B120, 3900 for 542J150, and 4500 for 542J180, with the following exceptions:

UNIT	UNIT	HEATER	UNIT	REQUIRED
				MINIMUM
549B	VOLTAGE	kW	CONFIGURATION
				CFM
	208/230	50.0	Horizontal	3250
			or
120			Vertical
	460	50.0	Horizontal	3400
			or
			Vertical

10.MINIMUM AMBIENT COOLING OPERATING TEMPERA- TURE — The minimum temperature for standard size 036- 120 units is 25 F. With accessory Motormaster® I, II, or IV

control, units can operate at outdoor temperatures down to –20 F.

Unit sizes 150 and 180 are designed to operate at outdoor temperatures down to 40 F. With accessory Motormaster I control, units can operate at outdoor temperatures down to –20 F.

11.INTERNAL UNIT DESIGN — Due to Bryant’s internal unit design (draw-thru over the motor), air path, and specially designed motors, the full horsepower (maximum continuous bhp) listed in the Physical Data table and the notes following each Fan Performance table can be utilized with confidence.

Using Bryant motors with the values listed in the Physical and Fan Performance Data tables will not result in nuisance tripping or premature motor failure. The unit warranty will not be affected.

12.CONDENSATE DRAIN PAN — A sloped condensate drain pan is supplied on all units. The condensate pan must be externally trapped. Condensate drains are located on both the bottom and end of the unit.

13.FIELD-SUPPLIED FAN DRIVES — If the factory drive sets must be changed to obtain other wheel speeds, consult the nearest Browning Manufacturing Co. sales office with the required new wheel speed and the data from Physical Data tables (center distances, motor and fan shaft diameters, motor horsepower) for a modified drive set selection. For minor speed changes, the fan sheave size should be changed. (Do not reduce the size of the motor sheave; this will result in reduced belt horse-power ratings and reduced belt life.)

14.CONDENSER COIL PROTECTION

Pre-Coated Aluminum-Fin Coils have a durable epoxy- phenolic coating applied to the fin prior to the fin stamping process to provide protection in mildly corrosive coastal environments. Pre-coated coils have an inert barrier between the aluminum fin and copper tube. This barrier electrically disconnects the dissimilar metals to minimize the potential for galvanic corrosion. This economical option provides substantial corrosion protection beyond the stan- dard uncoated coil construction.

Copper-Fin Coils provide increased corrosion resistance in moderate coastal environments where industrial air pollu- tion is not present. All copper coils eliminate bi-metallic con- struction to eliminate the potential for galvanic corrosion. Application in industrial environments is not recommended

due to potential attack from sulfur, sulfur oxide, nitrogen oxides, carbon and several other industrial airborne con- taminants. In moderate seacoast environments, copper-fin coils have extended life compared to standard or pre- coated aluminum-fin coils.

E-CoatedAluminum-Fincoils undergo a precisely con- trolled scientific process that bonds an impermeable epoxy coating to the specially prepared fin coil surface. E-Coating produces a smooth, consistent coating that is less brittle, more resilient and more durable than previous postcoating processes. E-Coated aluminum-fin coils offer economical protection and improved coil life in many contaminated environments.

E-CoatedCopper-Fin Coils provide maximum protection in virtually all environments, this option combines the continuous, impenetrable barrier of the E-Coating process with the natural resistance of an all-copper construction. E-Coated copper-fin coil assemblies ensure long life, even in environments that combine harsh coastal conditions with industrial contamination.

165