9. Slide out the motor and motor mounting plate.
10. Disconnect wiring connections and remove the 4 mount-
ing bolts.
11. Remove the motol:
12. To inst;dl the new motor, revel.se Steps 1-11.
Belt Tension Adjustment -- To adjust belt tension:
1. Loosen fan motor bolts.
2. a Size 016 Units:
Move motor mounting plate up or down for proper
belt tension (1/2 in. deflection with one finger).
b. Size 020-028 Units:
Turn motor jacking bolt to move motor mounting
plate up or down for propel belt tension (3/8 in.
deflection at midspan with one finger [9 lb force]).
3. Tighten nuts.
4. Adjust bolts and nut on mounting plate to secure motor in
fixed position.
Condenser-Fan Adjustment
48TJ01 (7,020 UNITS (Fig. 53)
1. Shut off unit power supply.
2. Remove access panel(s) closest to the fan to be adjusted.
3. Ix)osen fan hub setscrews.
4. Adjust fan height on shaft using a strtdghtedge placed
across the fan orifice.
5. Tighten setscrews and replace panel(s).
6. Turn on unit powec
48TJ024,028 UNITS (Fig. 54)
1. Shut off unit power supply.
2. Remove fan top-grille assembly and loosen fan hub
screws.
3. Adjust fan heigN on unit, using a straightedge placed
across the Nn orifice.
4. Tighten setscrews and replace rubber hubcap to prevent
hub from rusting to motor shaft.
5. Fill hub recess with permagum if robber hubcap is
missing.
Power Failure -- Dampers have a spring return. In event
of power failme, dampers will return to fully closed position
until power is restored. Do not manual@ ol)eraw economizer
mo_ol_
Refrigerant Charge -- Amount of refligerant chmge is
listed on unit nameplate and in Table 1. Refer to Carrier
_f =....N
NOTE: Dimensionsare in inches.
Fig. 53 -- Condenser Fan Adjustment, 48TJ016,020
RAIN
SHIELD
NOTE:Dimensions are in inches.
Fig. 54 -- Condenser-Fan Adjustment, 48TJ024,028
GTAC II; Module 5; Charging, Recovery. Recycling, and
Reclamation section for chguging methods and procedures.
Unit panels must be in place when unit is operating during
chguging procedure.
NOTE: Do not use recycled refrigerant as it may contain
contaminants.
NO CHARGE -- Use standard evacuating techniques. After
ewtcuating system, weigh in the specified amount of refriger-
ant (refer to Table 1).
LOW CHARGE COOLING -- Using cooling charging chart
(see Fig. 55), add or remove refrigerant until conditions of the
chart are met. Note that ch_uging ch_ut is different from those
nominally used. An accurate pressure gage and temperature-
sensing device is required. Charging is accomplished by ensur-
ing the proper amount of liquid sub-cooling. Measure liquid
line pressure at the liquid line service valve using pressure
gage. Connect temperature sensing device to the liquid line
ne;u the liquid line service valve and insulate it so that outdoor
ambient temperature does not affect reading.
TO USE THE COOLING CHARGING CHART -- Use the
above temperature and pressure readings, and find the intersec-
tion point on the cooling charging chin1. If intersection point
on chart is above line, add refrigerant. If intel.section point on
chtut is below line, carefully recover some of the charge.
Recheck suction pressure as charge is adjusted.
NOTE: Indoor-air cfm must be within normal operating range
of unit. All outdoor fans must be operating.
The TXV (thermostatic expansion valve) is set to maintain
between 15 and 20 degrees of supefl]eat at the compressors.
The valves are factory set and should not require re-adjustment.
MOISTUREMISER TM SYSTEM CHARGING -- The sys-
tem charge for units with the MoistureMiSer option is greater
than that of the standard unit _done. The chtuge for units with
this option is indicated on the unit nameplate &awing. To
chm:ge systems using the MoistureMiSer dehumidification
package, fully evacuate, recover, and re-chtuge the system to
the nameplate specified charge level. To check or adjust
refrigerant charge on systems using the MoistureMiSer dehu-
midification package, charge per the standard subcooling
chtuts. The subcooler MUST be deenergized to use the chalg-
ing chmts. The charts reference a liquid pressure (psig) and
temperature at a point between the condenser coil and the sub-
cooler coil. A tap is provided on the unit to measure liquid
pressure entering the subcooler (leaving the condenser).
BOTH CIRCUITS
ALL OUTDOOR FANS MUST BE OPERATING
_140,
_12°1I I 'Abd_HAR'G'E'I_AB'Ot/&CORV'E
Illll lllllllll llllll i
soolillilillilili ililli I
IIIIIIIIIIIIIIIIII1 t"
011111111IIIIIIIIJ,Z'I I
lili i lili iliiJZlilii I
III I I III I IJZI"I4Eb6&&&.'ARGE,FBELowCURVE
LU 60
IIIIIIIL/IIII
III1 11 III
50 100 150 200 250 300 350 400
LIQUID PRESSURE AT LIQUID VALVE (PSIG)
Fig. 55- Cooling Charging Chart
42
