S Fixed Orifice - Lennox EL16XC1 Series Installation And Service Procedure

DETERMINING CHARGE METHOD
START: Determine how refrigerant is metered
WHEN TO CHARGE?
S
Warm weather best
S
Can charge in colder weather
CHARGE METHOD? Determine by:
S
Metering device type
S
Outdoor ambient temperature
REQUIREMENTS:
S
Sufficient heat load in structure
S
Indoor temperature between 70‐80ºF
(21-26ºC)
S
Manifold gauge set connected to unit
S
Thermometers:
- to measure outdoor ambient temperature
- to measure liquid line temperature
- to measure suction line temperature
WEIGH IN
A
E
CHARGING METHOD
CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE
If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the
unit. To calculate the total refrigerant charge:
Amount specified on
nameplate
A
64ºF
(17.7ºC) and
Below
WEIGH‐IN
Figure 16. Determining Charge Method
64ºF (17.7ºC) and Below
Adjust amount. for variation
in line set length listed on
line set length table below.
+
Refrigerant Charge per Line Set Length
Liquid Line
Set Diameter
3/8" (9.5 mm)
*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.
NOTE — The above nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for
charge information.
Figure 17. Using HFC-410A Weigh In Method
Which indoor
metering
device?
TXV
B C
65ºF
(18.3ºC) and
Above
APPROACH OR
SUBCOOLING
Total charge
=
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3 ounce per 5' (85 g per 1.5 m)
Page 29
FIXED
ORIFICE
D
40ºF
(4.4ºC) and
(3.8ºC) and
Above
Below
SUPERHEAT
WEIGH‐IN
E
39ºF
EL16XC1 SERIES