Carrier 50DF034 - Manual (Page 16)

Outdoor (Condenser) Air Fan Adjustment
(Fig. 21) — Shut off unit power supply Remove fan
guard and loosen fan hub setscrews Adjust fan height
using a straight edge laid across venturi. Tighten set­
screws and replace rubber hubcap to prevent hub from
rusting to motor shaft. Fill hub recess with Permagum
if hub has no rubber hubcap.
Fig. 21 — Outdoor Air Fan Adjustment
Damper Vent Position Setting
1. On constant volume units, adjust thermostat or trans­
mitter so there is no call for cooling. On variable
volume units, adjust set point knob on microprocessor
so there is no call for cooling. The economizer
dampers go to minimum position
2 Remove cap from vent adjustment screw on top of
damper motor terminal box cover
3. Turn adjustment screw slowly until dampers assume
desired vent position. Do not manually operate
clamper motor. Damage to motor will result.
POWER FAILURE — Dampers have a spring return.
In the event of a loss of power, dampers close until power
is restored Do not manually operate damper motor.
Damage to motor will result.
Refrigerant Charge — Amount of refrigerant charge
is shown on unit nameplate and in Table 1. When charg­
ing refrigerant system, refer to Carrier Standard Service
Techniques Manual, Chapter 1, Refrigerants. When
adding a complete charge, evacuate the system using
standard evacuating procedures and weigh in specified
amount of refrigerant. A charging chart (Fig. 22) is pro­
vided on unit control box door above compressor and
may be used (use of sight glass not required).
When using refrigerant liquid line sight glass to charge
system:
1. Install a jumper on the low-pressure switch if required.
2. Operate unit with restricted condenser airflow to
achieve an operating discharge pressure of about
375 psig.
3. Slowly add refrigerant until sight glass clears.
4. Remove jumper from low-pressure switch and remove
condenser air restriction.
Fig. 22 — Charging Chart; 50DF034, System 1 and System 2
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book|l PC111 Catalog No 565-032 PrintedinUSA Form50DF-9SI Pg 16 790 4-86 Replaces: 50DF-7SI
For replacement items use Carrier Specified Parts Tab 1b