Installation, Operation and Maintenance Manual
VertiCool Classic
32
Subject to change without notice.
20.10-IM (0617)
Start-Up Procedures
(R-410a Systems)
Continued:
21.
Using an appropriate pressure / temperature chart for
R-410a refrigerant, look up and record the saturation
temperature corresponding to the suction pressure�
22.
Calculate and record the suction superheat for each
circuit by taking the difference between the suction
line temperature and the saturation temperature
corresponding to the suction pressure�
23.
Record the liquid line pressure and the liquid line
temperature for each circuit near the condenser coil
outlet�
24.
Using an appropriate pressure / temperature chart for
R-410a refrigerant, look up and record the saturation
temperature corresponding to the liquid line pressure�
25.
Calculate and record the liquid sub-cooling for each
circuit by taking the difference between the liquid
line temperature and the saturation temperature
corresponding to the liquid line pressure�
26.
Record the Amps for the evaporator blower motor, each
compressor and the condenser blower motor� If the
system is single phase, use L1 and L2 only�
a.
Make sure the pressures on each compressor circuit
are within the proper limits:
i.
290 – 550 Discharge
ii.
100 – 140 psig Suction
b.
Compressor Amperage is below the RLA Amps
listed on the unit data tag�
i.
The maximum compressor operating current
(amps) at start up depends a lot on the system
loading� The lower the load, the less the current�
The higher the load, the higher the current�
c.
The blower motor FLA values should never be
exceeded�
i.
If the FLA value is exceeded, shut the unit off
and check the duct design, sheave turns open
or make sure there is no blockage / obstruction
in the duct or filters.
27.
Document any additional information deemed
appropriate for the specific application or installation.
28.
Shut the system down and remove all test instruments
and test sensors�
29.
Leave the system in the operating mode as appropriate
for the customer and the application�
Optional Heating Start Up:
30.
If the system has any optional heat, set the room
thermostat approximately 5
°
higher than the actual
room temperature� Set the controller operating mode to
the HEAT position�
31.
Dependent upon the heating source the heating valve
or switch / contactor should be activated�
32.
After several minutes of operation, record the return air
temperature and the supply air temperature�
33.
Based on the heating source, document the
appropriate temperatures, pressures, voltage or amp
values�
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