Carrier 50JZ-A - Manual (Page 15)

15
6. Using the superheat value in step 5, locate the intersection
of the required superheat with the suction pressure previ-
ously measured. Note the required suction tube temperature.
Using a tolerance of +/-- 1.7°C, add refrigerant if actual
temperature is higher than charted suction tube temperature,
or remove refrigerant if actual temperature is lower than
charted suction tube temperature.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks section.
Indoor Airflow and Airflow Adjustments
UNIT OPERATION HAZARD
Failure to follow this caution may result in unit damage.
For heating and cooling operation, the recommended
airflow is 350 to 450 cfm for each 12,000 Btuh (165 L/s to
212 for each 3.5 kW) of rated cooling capacity. For units
with optional electric heat, the airflow must not be reduced
below the levels stated in Table 1.
CAUTION
!
NOTE: Be sure that all supply--and return--air grilles are open,
free from obstructions, and adjusted properly.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect electrical power to the unit and install lockout
tag before changing blower speed.
! WARNING
Table 3 – Color Coding for Indoor Fan Motor Leads
Black = High Speed
Blue = Med Speed (if available)
Red = Low Speed
To change the speed of the indoor fan motor, remove the fan lead
from the splice connection. Replace with the desired fan speed
lead. Insulate the unused lead to prevent shorting.
50ES500443 - 2.0
A09336
Fig. 16 -- Cooling Charging Table--Superheat
50J
Z
--
A