3DJH
Liquid Line
Set Diameter
Ozs. per 5 ft. (ml per mm) adjust
from 20 ft. (6096 mm) line set*
1/4 in.
(6mm)
1 ounce per 5 ft.
(30ml per 1524 mm)
3/8 in.
(10mm)
5/16 in.
(8mm)
2 ounce per 5 ft.
(60ml per 1524 mm)
3 ounce per 5 ft.
(90ml per 1524 mm)
*If line length is greater than 20 feet (6096 mm), add this amount.
If line length is less than 20 feet (6096 mm), subtract this amount.
TABLE 2
If the system is void of refrigerant, the recommended
and most accurate method of charging is to weigh the
refrigerant into the unit according to the total amount
shown on the unit nameplate. This may be done after
any leaks have been repaired. If weighing facilities
are not available or if unit is just low on charge, use
one of the procedures outlined.
Charging a heat pump is recommended during warm
weather. However, applications arise in which charg-
ing must occur in the colder months. The way the unit
is charged depends on the units refrigerant metering
device and the outdoor ambient temperature.
For RFC systems, weighing in the charge and Subcool-
ing are two acceptable means of charging under certain
conditions. For installations of an RFC system where the
outdoor ambient is less than 60EF, weighing in the
charge is the best method. However, in installations
where the outdoor ambient is 60EF or above, subcool-
ing is the best method.
The Subcooling and the Approach methods are the
two recommended procedures for charging the HP23
using an expansion valve system for refrigerant me-
tering. The difference between the two involves the
outdoor ambient temperature. For expansion valve
systems where the outdoor ambient temperature is
60EF or above, the Approach method must be used.
For expansion valve systems where the outdoor am-
bient temperature is below 60EF, the subcooling
method should be used.
Before charging the unit, follow the procedure below
to determine: the liquid line temperature and the out-
door ambient temperature.
1-- Connect manifold gauge set to service valves: low
pressure gauge to vapor valve service port; high
pressure gauge to liquid valve service port. Con-
nect the center manifold hose to an upright bottle
of R22. Close manifold gauge set valves.
2-- Set the room thermostat to call for heat. This will
create the necessary load for properly charging
the system in the cooling cycle.
3-- Fill the thermometer well with mineral oil.
4-- Record the outdoor ambient temperature. For
greater accuracy, use the same thermometer to
measure liquid temperature.
5-- When thermostat demand has been satisfied,
switch to cooling mode with a set point of 68EF.
When pressures have stabilized, place the ther-
mometer in thermometer well and record the liq-
uid line temperature.
6-- The outdoor temperature will determine which
charging method to use. Proceed with the ap-
propriate charging procedure below.
NOTE--The model number 410 refers to both 411
(single--phase) and 413 (three--phase) units. The
same applies for 460 (461/463), 510 (511/513) and 650
(651/653) units.
&+$5*,1* )25 5)& 6<67(06
Weighing in the Charge Method
RFC Systems, < 60EF Outdoor Temp
5HFRYHU WKH UHIULJHUDQW IURP WKH XQLW
&RQGXFW D OHDN FKHFN WKHQ HYDFXDWH DV SUHYLRXVO\
RXWOLQHG
:HLJK LQ WKH IDFWRU\ FKDUJH DV VKRZQ RQ WKH RXWGRRU
XQLWV UDWLQJ SODWH
The Subcooling Method
RFC Systems, > 60EF Outdoor Temp
:LWK WKH PDQLIROG JDXJH KRVH VWLOO RQ WKH OLTXLG VHU
YLFH SRUW DQG WKH XQLW RSHUDWLQJ VWDEO\ UHFRUG WKH OLT
XLG OLQH WHPSHUDWXUH
$W WKH VDPH WLPH UHFRUG WKH OLTXLG OLQH SUHVVXUH
UHDGLQJ
8VLQJ D WHPSHUDWXUHSUHVVXUH FKDUW IRU 5 GHWHU
PLQH WKH VDWXUDWLRQ WHPSHUDWXUH IRU WKH OLTXLG OLQH
SUHVVXUH UHDGLQJ
6XEWUDFW WKH OLTXLG OLQH WHPSHUDWXUH IURP WKH VDWXUD
WLRQ WHPSHUDWXUH DFFRUGLQJ WR WKH FKDUW WR GHWHU
PLQH VXEFRROLQJ /LTXLG OLQH WHPSHUDWXUH 6DWX
UDWLRQ WHPSHUDWXUH 6XEFRROLQJ
&RPSDUH WKH VXEFRROLQJ YDOXH ZLWK WKRVH LQ WDEOH
,I VXEFRROLQJ LV JUHDWHU WKDQ VKRZQ VRPH UHIULJHUDQW
PXVW EH UHFRYHUHG ,I VXEFRROLQJ LV OHVV WKDQ VKRZQ
VRPH UHIULJHUDQW PXVW EH DGGHG
Outdoor
Unit
Indoor
Unit
Ambient Temperatures _F
65 75 85 95 105 115
HP23--141
HP23--211
HP23--261
HP23--410
CB/CBH19--41
CB/CBH19--26
CB/CBH19--21
CB/CBH19--21
Subcooling at Various
CB/CBH19--31
CB/CBH19--41
HP23--311
HP23--460
TABLE 3
SUBCOOLING METHOD--RFCIII Systems
5
13
12
12
17
11
5
13
12
12
15
10
4
13
11
10
14
7
1
12
9
8
11
6
0
6
7
6
8
4
0
4
5
4
5
2
CB19--51
HP23--510
11 10 8 7
5
2
CB/CBH19--41
HP23--410CDN
13 12 10 8
6
3
&+$5*,1* )25 7;9 6<67(06
