Carrier 50GJ006, Инструкция по установке, запуску и обслуживанию, Страница: 18 / 36

Step 7 — Adjust Evaporator-Fan Speed —
Ad-
just evaporator-fan speed to meet jobsite conditions.
For units with electric heat, required minimum cfm is 1500
for 50GJ006, 2250 for 50GJ008 and 3000 for 50GJ012 with
the following exceptions:
UNIT
50GJ
UNIT
VOLTAGE
HEATER
kW
UNIT
CONFIG-
URATION
REQUIRED
MINIMUM
CFM
012
208/230 42.4 Horizontal 3200
208/230 50.0 Horizontal 3200
460 50.0
Horizontal
or
Vertical
3200
008,012 575
17.0
Horizontal
or
Vertical
2800
34.0 2350
Table 4 shows evaporator-fan motor data. Table 5 shows fan
rpm at motor pulley settings for standard and alternate mo-
tors. Refer to Tables 6-11 to determine fan speed settings.
Fan motor pulleys are factory set for speed shown in
Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen belt by loosening fan motor mounting nuts. See
Fig. 27 and 28.
3. Loosen movable pulley flange setscrew (see Fig. 29).
4. Screw movable flange toward fixed flange to increase speed
or away from fixed flange to decrease speed. Increasing
fan speed increases load on motor. Do not exceed maxi-
mum speed specified in Table 1.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Table 1 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 mount-
ing plate.
To adjust belt tension:
1. Loosen fan motor mounting nuts.
2. Sizes 006,008 — Slide motor mounting plate away from
fan scroll for proper belt tension ( 1 ⁄
2
-in. deflection with
one finger) and tighten mounting nuts (see Fig. 27).
Size 012 — Slide motor mounting plate downward to tighten
belt tension. Secure motor mounting plate nuts. See
Fig. 28.
3. Adjust bolt and nut on mounting plate to secure motor
evaporator in fixed position.
MOTOR MOUNTING
PLATE NUTS
Fig. 27 − Typical Belt-Drive Motor Mounting
for Sizes 006,008
Fig. 28 — Typical Belt-Drive Motor Mounting
for Size 012
Fig. 29 — Evaporator-Fan Pulley Adjustment
18