System Configuration; Unit Components - Lennox Elite SPB H4 Series Installation Instructions Manual

Charging
The SPB*H4 unit is factory-charged with enough HFC-410A refrigerant to accommodate a 15-foot length of refrigerant pip­
ing. Charge should be checked and adjusted using the tables provided on the charging procedure sticker on the unit access
panel. Detailed information is given in the SPB*H4 Installation and Service Procedures manual, which is available on Dave­
Net.
Use the charging formula listed in figure 16 to calculate liquid line charge required for long line sets.
WEIGH-IN
CHARGING METHOD FOR LONG LINE SETS
64ºF (17.7ºC) and Below
Adjust amount for variation in
line set length and liquid line
Amount specified
diameter using table below.
on nameplate
+
Liquid Line
Set Diameter
5/16"

System Configuration

This section addresses:
D Unit components (sensors, temperature switch, pres­
sure switches and demand defrost control)
D Second-stage operation

UNIT COMPONENTS

Demand Defrost Control (A108)
The demand defrost control measures differential temper­
Adding refrigerant for long line sets
Total charge
=
HFC-410A
(ounces per foot)
0.40
3/8" 0.60
1/2" 1.00
FIGURE 16. Using HFC-410A Weigh-In Charging Method
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.
NOTE - The nameplate shown is for illustration purposes only. Go to
actual nameplate on outdoor unit for charge information.
Charging Formula for Liquid Line Charge Adjustments
[(Line set oz./ft. x total length) ­ (factory charge for line set)] = charge adjustment
Example: Units are factory­charged for 15 feet (4.6 meters) of 3/8" line set.
Factory charge for 3/8" is 0.60 oz/ft x 15 = 9.0 ounces.
atures to detect when the system is performing poorly be­
cause of ice build-up on the outdoor coil. The control self-
calibrates when the defrost system starts and after each
system defrost cycle. The demand defrost control compo­
nents are shown in figure 17.
D Demand defrost control connections, jumpers and LED
locations are shown in figure 17.
D Demand defrost control connections, jumpers and LED
descriptions are listed on table 2.
D Demand defrost control status, fault and lockout LEDs
are listed in table 3.
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