Bryant 580F 27, CO2 Sensor* Standard Settings, Ix. — Adjust Evaporator-Fanspeed, for Sizes

Table 7 — CO2 Sensor* Standard Settings

			VENTILATION	ANALOG	CO2 CONTROL	OPTIONAL	RELAY
SETTING	EQUIPMENT	OUTPUT	RATE			RELAY SETPOINT	HYSTERESIS
			(cfm/Person)	OUTPUT	RANGE (ppm)	(ppm)	(ppm)
1	Interface with Standard	Proportional	Any	4-20 mA	0-2000	1000	50
2		Proportional	Any	7-20 mA	0-2000	1000	50
	Building Control System
3		Exponential	Any	4-20 mA	0-2000	1100	50
4		Proportional	15	4-20 mA	0-1100	1100	50
5	Economizer	Proportional	20	4-20 mA	0- 900	900	50
6		Exponential	15	4-20 mA	0-1100	1100	50
7		Exponential	20	4-20 mA	0- 900	900	50
8	Health & Safety	Proportional	—	4-20 mA	0-9999	5000	500
9	Parking/Air Intakes/ Loading Docks	Proportional	—	4-20 mA	0-2000	700	50

LEGEND

ppm — Parts Per Million

*Available sensor part numbers are listed in Table 4.

IX. STEP 9 — ADJUST EVAPORATOR-FAN SPEED

Adjust evaporator-fan speed to meet jobsite requirement.

Table 8 shows fan rpm at motor pulley settings and Table 9 shows motor efficiencies. Table 10 shows motor performance. Refer to Fan Performance Tables 11-30 to determine fan speed settings. Fan motor pulleys are factory set for speed shown in Tables 1A and 1B.

To change fan speed:

1.Shut off unit power supply and install lockout tag.

2.Loosen belt by loosening fan motor mounting plate nuts (see Fig. 33 and 34).

3.Loosen movable pulley flange setscrew (see Fig. 35).

4.Screw movable flange toward fixed flange to increase fan speed and away from fixed flange to decrease fan speed. Increasing fan speed increases load on motor. Do not exceed maximum speed specified in Tables 1A and 1B.

5.Set movable flange at nearest flat of pulley hub and tighten setscrew (see Tables 1A and 1B for speed change for each full turn of pulley flange).

To align fan and motor pulleys:

1.Loosen fan pulley setscrews.

2.Slide fan pulley along fan shaft.

3.Make angular alignment by loosening motor from mounting plate.

To adjust belt tension (see Fig. 33 and 34):

1.Loosen fan motor mounting plate nuts.

2.Units 090-103 — Slide motor mounting plate away from fan scroll for proper belt tension (1/2-in.

deflection with 5 to 10 lb of force) and tighten mount- ing nuts (see Fig. 33).

Units 120-151 — Slide motor mounting plate down- ward to tighten belt tension. (1/2-in. deflection with 5 to 10 lb of force.) Secure motor mounting plate nuts. See Fig. 34.

3.Adjust bolt and nut on mounting plate to secure motor in fixed position.

Realign fan and motor pulleys:

1.Loosen fan pulley setscrews.

2.Slide fan pulley along fan shaft.

3.Make angular alignment by loosening motor from mounting plate.

MOTOR MOUNTING

PLATE NUTS

Fig. 33 — Typical Belt-Drive Motor Mounting

for Sizes 090-103

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