INSTALLATION INSTRUCTIONS HS25 SERIES UNITS - Lennox

CHARGING
Units are factory charged with the amount of R--22 refrigerant
indicated on the unit rating plate. This charge
is based on a matching indoor coil and outdoor coil
with 20 ft. (6.1m) line set. For varying lengths of line set,
refer to table 2 for refrigerant charge adjustment.
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If the system is void of refrigerant, the recommended
and most accurate method of charging is to weigh
the refrigerant according to the total amount shown
on the unit nameplate. If weighing facilities are not
available or if unit is just low on charge, use the following
procedure:
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The following procedure is intended as a general
guide and is for use on expansion valve systems only.
For best results, indoor temperature should be 70E F
(21EC) to 80E F (26EC). Be sure to monitor system
pressures while charging.
1-- Record outdoor ambient temperature.
2-- Operate unit to allow system to stabilize both before
and after each charge adjustment.
3-- Check to make sure thermometer well is filled
with mineral oil before checking liquid line temperature.
4-- Outdoor temperature should be 60E F(16EC) or
above. Place thermometer in well and read liquid
line temperature. Difference between ambient
and liquid temperatures should match values
given in table 3. Refrigerant must be added to
lower approach temperature and removed to increase
approach temperature. Loss of charge results
in low capacity and efficiency.
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SYSTEM OPERATION
Condensing unit and indoor blower cycle on demand
from room thermostat. When thermostat blower
switch is moved to ON position, indoor blower operates
continuously.
Compressor Time Delay (TD1)
A compressor time delay is used to prevent compressor
short cycling and to prevent the compressor from
running backwards. When there is demand for a cooling
cycle, the control delays the compressor from starting
for a minimum of 8.5 seconds. Do not bypass the
control.
Discharge Thermostat
The Copeland Scroll compressor is equipped with a
discharge line thermostat that removes power from
the compressor when discharge temperatures reach
approximately 280E F (138EC). The thermostat resets
automatically at 130E F (54EC).
CAUTION
Danger of equipment damage. Do not bypass the
discharge thermostat.
High Pressure Switch
HS25 units are equipped with a high pressure switch
that is located in the discharge line of the compressor.
The switch (SPST, manual reset, normally closed) removes
power from the compressor when discharge
pressure rises above factory setting at 410 + 10 psi
(2827 + 69 kPa).
Low Pressure Switch
HS25 units are also equipped with a low pressure
switch that is located in the suction line of the compressor.
The switch (SPST, auto--reset, normally closed) removes
power from the compressor when suction line
pressure drops below factory setting at 25 +5 psi (172 +
34 kPa).
MAINTENANCE
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn
the electrical power to unit OFF at disconnect
switch(es). Unit may have
multiple power supplies.
At the beginning of each cooling season, the system
should be checked as follows:
1-- Clean and inspect condenser coil. Coil may be
flushed with a water hose.
2-- Condenser fan motor is prelubricated and sealed.
No further lubrication is needed.
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