Step 7 - Adjust Indoor-Fan Speed; Direct-Drive Motors; Belt-Drive Motors - Carrier 50TFQ004 Installation, Start-Up And Service Instructions Manual

SETTING EQUIPMENT
1
Interface w/Standard
2
Building Control System
3
4
5
Economizer
6
7
8 Health & Safety
Parking/Air Intakes/
9
Loading Docks
LEGEND
ppm — Parts Per Million
Step 7 — Adjust Indoor-Fan Speed —
indoor-fan rpm to meet jobsite conditions.
Table 8 shows fan rpm at motor pulley settings for the
50TFQ004-007 units. Table 9 shows data for indoor-fan
motors. Tables 10A and 10B show Accessory Static Pressure.
Refer to Tables 11-32 to determine fan speed settings.
For units with electric heating, required minimum cfm is
900 for 50TFQ004; 1200 for 50TFQ005; 1500 for 50TFQ006
and 1800 for 50TFQ007.
DIRECT-DRIVE MOTORS — The indoor fan motor facto-
ry speed setting is shown on the label diagram affixed to base
unit. If other speed setting is desired, refer to label diagram for
motor reconnection.
BELT-DRIVE MOTORS — Fan motor pulleys are factory-
set for speed shown in Table 1. Check pulley alignment and
belt tension prior to start-up.
To change fan speed:
1. Shut off the unit power supply and tag disconnect.
2. Loosen the belt by loosening the fan motor mounting
nuts. See Fig. 40.
3. Loosen the movable pulley flange setscrew (see Fig. 41).
4. Screw the movable flange toward the fixed flange to
increase speed or away from the fixed flange to decrease
speed. Increasing fan rpm increases the load on the
motor. Do not exceed the maximum speed specified in
Table 1.
5. Set the movable flange at the nearest flat edge of the
pulley hub and tighten the setscrew. (See Table 1 for
speed change for each full turn of the pulley flange.)
6. Adjust the belt tension to
downward force.
7. Realign the fan and motor pulleys.
To align the fan and motor pulleys (see Fig. 41):
1. Loosen the fan pulley setscrews.
2. Slide the fan pulley along the fan shaft.
3. Make angular alignment by loosening the motor from
mounting.
To adjust the belt tension:
1. Loosen the fan motor mounting nuts.
2. Slide the motor mounting plate away from the fan scroll
5
for proper belt tension (
downward force).
Table 7 — CO
VENTILATION
OUTPUT RATE
(cfm/Person)
Proportional Any
Proportional Any
Exponential Any
Proportional 15
Proportional 20
Exponential 15
Exponential 20
Proportional —
Proportional —
Adjust the
5
/ -in. deflection at 7 to 10 lb of
8
/ -in. deflection with 7 to 10 lb of
8
Sensor Standard Settings
2
CO
ANALOG
CONTROL RANGE
OUTPUT
(ppm)
0-10V
0-2000
4-20 mA
2-10V
0-2000
7-20 mA
0-10V
0-2000
4-20 mA
0-10V
0-1100
4-20 mA
0-10V
0- 900
4-20 mA
0-10V
0-1100
4-20 mA
0-10V
0- 900
4-20 mA
0-10V
0-9999
4-20 mA
0-10V
0-2000
4-20 mA
3. Tighten the motor mounting nuts.
4. Adjust the bolt and tighten the nut to secure the motor in a
fixed position.
5. Recheck pulley alignment.
Fig. 40 — Belt-Drive Motor Mounting
Fig. 41 — Indoor-Fan Pulley Adjustment
29
OPTIONAL
2
RELAY SETPOINT
(ppm)
1000
1000
1100
1100
900
1100
900
5000
700
RELAY
HYSTERESIS
(ppm)
50
50
50
50
50
50
50
500
50