Carrier 50AH024 Installation, Start-Up And Service Instructions Manual page 5

13 Recharge unit with R-22 following Charging Charts
(Fig. 4-7) in these instructions.
After splitting sections, additional refrigerant must be added
to system to ensure proper refrigerant charge. The amount
of refrigerant to be added depends on length of tubing added
to system and operating temperatures of system. Refer to
Carrier System Design Manual, Chapter 3.
Since standard roomtop unit has negligible line losses,
splitting the system can increase line loss and decrease sys¬
tem capacity. Capacity reduction can be determined by re¬
ferring to Carrier System Design Manual.
Field Control Wiring
— Install a Carrier-approved
accessory thermostat assembly according to installation in¬
structions provided by thermostat manufacturer. Locate ther¬
mostat assembly on a solid wall in the conditioned space
away from drafts to sense average room temperature.
Using thermostat cable or equivalent single leads of
no. 18 AWG colored wire, route cable or wire from the
subbase terminals, up and through connector on unit side
(below power lead junction box) and connect to low-
voltage terminal block inside the control box.
Thermostat Wire
— Use 18 gage for 0-ft to 50-ft long
wires and 16 gage for 51- to 75-ft wire lengths.
Step 8 — Fan Speed
— Adjust fan speed to meet
jobsite conditions. Refer to Tables 3-5 to determine fan speed
settings.
DIRECT DRIVE MOTORS — The evaporator-fan motor
factory speed setting is shown on label diagram affixed to
base unit. If other than factory setting is desired, refer to
label diagram for motor reconnection.
BELT DRIVE MOTORS — The condenser-fan motors on
50AH036-060 units are belt drive The 50AH024 has a direct-
drive motor.
Table 3 — Evaporator-Fan Performance
UNIT SIZE - 50AH
AIRFLOW
(cfm)
024 j 036 ] 048* ;
060*
ESP
Fan
kW
ESP
Fan
kW
ESP
Fan
kW
ESP
Fan
kW
600 60
20
— — —
_
_ _
700 54 .22
— — — — _ —
800 43 .24 - — - —
- —
900
.29 26 .69 .44
— _ _ _
1000 .11 29 .57 .46
— — — —
1100
— —
.42 .49
1.10 45 1 11 .52
1200
— — .23
.52
1.01 .49 1.045
.55
1300
— — — —
.90 51 .97 .57
1400
— — — —
.79 .55 .88
.59
1500
— — — —
67 .58
.78 .62
1600
— — — —
.54 .61
.67 .64
1700
— — — —
39 .64 .53 .67
1800
— — — —
22 .67 39
.70
1900
— — — —
03
70 24 .74
2000
— — —
— —
—
07
.78
CFM
— Cubic Feet Per Minute
ESP
— External Static Pressure (in. wg)
kW
— Total Fan Motor Power Input (kilowatts)
'Standard direct drive indoor-fan motor (IFM). For optional belt drive
IFM performance, see following table.
NOTES:
1. Above fan performance is based on wet coil and deducted casing
losses, and clean factory-installed permanent cleanable filter.
2. Evaporator fans are direct drive (except 048, 060 special order
indoor fan motor option).
3. Interpolation is permissible, do not extrapolate.
Table 4 — Belt Drive Evaporator-Fan Performance*
AIRFLOW
(cfm)
UNIT SIZE - 50AH
| 048 | 060
ESP Fan kW ESP Fan kW
1800
— — —
1850
— — — —
1900
— — — —
1950
81 1.03
— —
2000
72 1.05
— —
2050
63
1.07
— —
2100
55 1.08 1.02 1 17
2150
47 1 11 93 1.21
2200
42 1 14 84 1 24
2250
34
1.17
75 1 27
'Special order only.
NOTE: Pulley setting must be adjusted to limit cfm to 450 cfm/ton
maximum.
Unit operation beyond that limit may result in blow-off and
condensate problems
5