Lennox AC13 -018, Руководство по установке

Страница: 19 / 24

Page 19
AC13 SERIES
DO NOT CHARGE UNIT
(Results of charging at low
temperatures not reliable)
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
Weigh-in or remove refriger-
ant based upon line length
APPº (Approach) Values(F:+/−1.0° [C: +/−0.6°])
1. Confirm proper airflow across coil using figure
32.
2. Compare unit pressures with Table 5, Normal
Operating Pressures .
3. Set thermostat to call for heat (must have a
cooling load between 70-80ºF (21−26ºC).
4. Connect gauge set.
5. When heat demand is satisfied, set thermostat
to call for cooling.
6. Allow temperatures and pressures to stabilize.
7. Record outdoor ambient temperature:
AMBº =_________
8. Record liquid line temperature:
LIQº = __________
9. Subtract to determine approach (APPº):
LIQº_____ − AMBº _____ = APPº_____
10. Compare results with table below.
Figure 36. HCFC−22 Approach TXV Charge
ABOVE or
BELOW
If value is MORE
than shown, remove
refrigerant.
If value is LESS
than shown, add
refrigerant.
If refrigerant is added
or removed, verify
charge using the
Subcooling Method .
MORE or
LESS
−018 −024 −030 −036 −042 −048 −060
TEMP* 6 (3.3) 6 (3.3) 8 (4.4) 12 (6.7) 5 (2.8) 6 (3.3) 7 (3.8)
*Temperature of air entering outdoor coil is 65ºF (18ºC) or above.
64ºF
(17.7ºC) and
BELOW
65ºF
(18ºC)
and
ABOVE
WEIGH IN RFC
START: Measure outdoor ambient temperature
1. Check Liquid and suction line pressures
2. Compare unit pressures with Table 5,
Normal Operating Pressures .
3. Conduct leak check; evacuate as
previously outlined.
4. Weigh in the unit nameplate charge plus
any charge required for line set differences
over 15 feet.
Liquid Line
Set Diameter
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3/8" (9.5 mm)
3 ounce per 5’ (85 g per 1.5 m)
NOTE − *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.
Refrigerant Charge per Line Set Length
USE SUPERHEAT
This nameplate is for illustration purposes
only. Go to actual nameplate on outdoor unit
for charge information.
ABOVE or
BELOW
39ºF (3.8ºC)
and BELOW
40ºF (4ºC)
and
ABOVE
Figure 37. HCFC−22 Weigh In RFC Method