Carrier 48TJ016-028 Belt Tension Adjustment --To adjust belt tension, Condenser-Fan Adjustment

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: Dimensions are 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°1 I I 'Abd_HAR'G'E'I_AB'Ot/&CORV'E

Illll lllllllll llllll i

soolillilillilili ililli I

IIIIIIIIIIIIIIIIII1 t" 01111111IIIIIIIIJ,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