50Ez- -A Sequence Of Operation; Checking & Adjusting Refrigerant Charge; Indoor Airflow & Airflow Adjustments - Carrier 50EZ-A30 Installation Instructions Manual

IMPORTANT: Three- -phase, scroll compressors are direction
oriented. Unit must be checked to ensure proper compressor
3- -phase power lead orientation. If not corrected within 5 minutes,
the internal protector will shut off the compressor. The 3- -phase
power leads to the unit must be reversed to correct rotation. When
turning backwards, the difference between compressor suction and
discharge pressures may be near zero.
50EZ- - A Sequence of Operation
a. CONTINUOUS FAN
(1.) Thermostat closes circuit R to G energizing the
blower motor for continuous fan.
b. COOLING MODE
(1.) If indoor temperature is above temperature set
point, thermostat closes circuits R to G, R to Y and
R to O- -The unit delivers cooling airflow.
c. ELECTRIC HEATING MODE
(1.) Thermostat closes circuit R to W/W1, or W2 and R
to G. There are no on or off delays.
d. HEAT PUMP HEATING MODE
(1.) Thermostat closes circuits R to G and R to Y. The
compressor, indoor and outdoor fans are energized.
e. HEAT PUMP HEATING WITH AUXILIARY
ELECTRIC HEAT
(1.) Thermostat closes circuits R to G, R to Y and R to
W/W1 or W2. The compressor, indoor and outdoor
fans are energized, as well as the electric heat
relays.
f. DEFROST MODE
The defrost mode is automatically energized by the
defrost board during heating mode. The defrost board
energizes "O" (reversing valve) and "W2" (electric
heat). It also de- -energizes the outdoor fan. When defrost
is complete, unit will return to heating mode. If room
thermostat is satisfied during defrost, unit will shut
down and restart in defrost on next call for heat.
Checking and Adjusting Refrigerant Charge
The refrigerant system is fully charged with Puron (R- -410A)
refrigerant and is tested and factory sealed.
WARNING
!
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors.
mixtures of air or gases containing
oxygen can lead to an explosion.
NOTE:
Adjustment of the refrigerant charge is not required
unless the unit is suspected of not having the proper Puron
(R- -410A) charge.
A subcooling charging chart is attached to the inside of the
compressor access panel (see Fig. 19). The chart includes the
required liquid line temperature at given discharge line pressures
and outdoor ambient temperatures.
An accurate thermocouple- - or thermistor- -type thermometer, and a
gauge manifold are required when using the subcooling charging
method for evaluating the unit charge. Do not use mercury or small
dial- -type thermometers because they are not adequate for this type
of measurement.
NOTE: Allow system to operate for a minimum of 15 minutes
before checking or adjusting refrigerant charge.
IMPORTANT:
indicated adjustment to the specified factory charge must always be
very minimal. If a substantial adjustment is indicated, an abnormal
condition exists somewhere in the cooling system, such as
insufficient airflow across either coil or both coils.
Proceed as follows:
1. Remove caps from low- - and high- -pressure service fittings.
2. Using hoses with valve core depressors, attach low- - and
high- -pressure gauge hoses to low- - and high- -pressure
service fittings, respectively.
3. Start unit and let run until system pressures stabilize.
4. Measure and record the following:
a. Outdoor ambient- -air temperature (F [C] db).
b. Liquid line temperature (F [C]) at TXV.
c. Discharge (high- -side) pressure (psig).
d. Suction (low- -side) pressure (psig) (for reference only).
5. Using Cooling Charging Charts compare outdoor- -air
temperature (F [C] db) with the discharge line pressure
(psig) to determine desired system operating liquid line
temperature (See Fig. 16).
6. Compare actual liquid line temperature with desired liquid
line temperature. Using a tolerance of 2F (1.1C), add
refrigerant if actual temperature is more than 2F (1.1C)
higher than proper liquid line temperature, or remove
refrigerant if actual temperature is more than 2F (1.1C)
lower than required liquid line temperature.
NOTE:
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 cooling operation, the recommended airflow is 350 to
450 cfm for each 12,000 Btuh of rated cooling capacity. For
heating operation, the airflow must produce a temperature
rise that falls within the range stamped on the unit rating
plate.
NOTE: Be sure that all supply- -and return- -air grilles are open,
free from obstructions, and adjusted properly.
ELECTRICAL SHOCK HAZARD
Pressurized
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.
This unit has independent fan speeds for gas heating and cooling.
In addition, this unit has the field-selectable capability to run two
different cooling fan speeds: A normal cooling fan speed (350~400
CFM/Ton) and an enhanced dehumidification fan speed (As low as
320 CFM/Ton) for use with either a dehumidistat or a thermostat
that supports dehumidification.
The cooling speed is marked "LOW" on the interface fan board
(IFB) (See. Fig. 14). The factory-shipped settings are noted in
Table 4. There are 4 additional speed tap wires available for use in
either electric heating or cooling (For color coding on the indoor
fan motor leads, see Table 3). The additional 4 speed tap wires are
17
When evaluating the refrigerant charge, an
If the problem causing the inaccurate readings is a
CAUTION
!
WARNING
!