Page 20
Checking Refrigerant Charge
The EL22XPV unit is factory-charged with enough HFC-
410A refrigerant to accommodate a 15-foot length of re-
frigerant piping. For refrigerant piping greater than 15
feet, calculate the additional charge using the table below.
Then add the additional charge specied for the specic
indoor coil match-up listed on the unit charging sticker.
When charging the system with refrigerant or checking
refrigerant, the “Charge Mode” (CHRG MODE) jumper
provides the ability operate the unit at 100% capacity. See
Charge Mode Jumper section on page 17 for details.
Charge should be checked and adjusted using the ta-
bles provided on the charging procedure sticker on
the unit access panel. Detailed information is given in
the EL22XPV Installation and Service Procedures manu-
al, which is available on LennoxPros.com.
Refrigerant Charge per Line Set Length
LIQUID LINE DIA.
OUNCES PER 5 FEET (G PER 1.5 M) ADJUST
FROM 15 FEET (4.6 M) LINE SET*
3/8" (9.5 MM) 3 OUNCES PER 5' (85 G PER 1.5 M)
*If line length is greater than 15 ft. (4.6 m), add this amount. If line
length is less than 15 ft. (4.6 m), subtract this amount.
NOTE – Insulate liquid line when it is routed through areas where
the surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or
greater than 20 psig.
High Pressure Switch (S4)
This unit is equipped with a high pressure switch which is
located on the liquid line. The SPST, normally closed pres-
sure switch opens when liquid line pressure rises above
the factory setting of 590 + 15 psig and automatically re-
sets at 418 + 15 psig.
Homeowners Information
CAUTION
Before attempting to perform any service or maintenance,
turn the electrical power to unit OFF at disconnect switch.
In order to ensure peak performance, your system must
be properly maintained. Clogged lters and blocked air-
ow prevent your unit from operating at its most ecient
level. The system should be inspected and serviced be-
fore each cooling and heating season by a licensed pro-
fessional HVAC service technician (or equivalent).
Homeowner Maintenance
The following maintenance may be performed by the
homeowner.
• Contact a licensed professional HVAC technician to
schedule inspection and maintenance appointments for
your equipment before each heating and cooling season.
• Check the indoor unit lter each month and replace the
lter, if necessary.
• Have your Lennox dealer show you where your indoor
unit lter is located. It will be either at the indoor unit
(installed internal or external to the cabinet) or behind
a return air grille in the wall or ceiling. Check the lter
monthly and clean or replace it as needed. Disposable
lters should be replaced with a lter of the same type
and size.
• Check the indoor unit drain line for obstructions month-
ly. The indoor coil is equipped with a drain pan to collect
condensate formed as your system removes humidity
from the inside air. Have your dealer show you the loca-
tion of the drain line and how to check for obstructions.
(This would also apply to an auxiliary drain, if installed.)
• Check the area around the outdoor unit monthly and
remove any obstructions that may restrict airow to the
outdoor unit. This would include grass clippings, leaves,
or papers that may have settled around the unit.
• Trim shrubbery away from the unit and periodically
check for debris which collects around the unit.
• During the winter months, keep the snow level below
the louvered panels.
NOTE - The lter and all access panels must be in place
any time the unit is in operation. If you are unsure about
the lter required for your system, call your Lennox dealer
for assistance.
Heat Pump Operation
Your new Lennox heat pump has several characteristics
that you should be aware of:
• Heat pumps satisfy heating demand by delivering large
amounts of warm air into the living space. This is quite
dierent from gas- or oil-red furnaces or an electric fur-
nace which deliver lower volumes of considerably hotter
air to heat the space.
• Do not be alarmed if you notice frost on the outdoor coil
in the winter months. Frost develops on the outdoor coil
during the heating cycle when temperatures are below
45°F (7°C). The heat pump control activates a defrost
cycle lasting 5 to 15 minutes at preset intervals to clear
the outdoor coil of the frost.
• During the defrost cycle, you may notice steam rising
from the outdoor unit. This is a normal occurrence. The
thermostat may engage auxiliary heat during the defrost
cycle to satisfy a heating demand; however, the unit will
return to normal operation at the conclusion of the de-
frost cycle.
IMPORTANT
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure
of the unit to treated water (i.e., sprinkler systems,
soakers, waste water, etc.) will corrode the surface of
the steel and aluminum parts, diminish performance
and aect longevity of the unit.
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