11
13. Start up
13.1 System start up
Weigh-In method can be used for the initial installation, or anytime a
system charge is being replaced. Weigh-In Method can also be used
when power is not available to the equipment site or operating
conditions (indoor/outdoor temperatures) are not in range to verify
with the liquid line pressure charging method.
Figure 31
14. System charge adjustment
14.1 Charging: Weigh-In Method
Table 7
Model
Factory Charge
5/16''
3/8''
1/2''
0.4 oz/ft
0.6 oz/ft
1.2 oz/ft
Charge multiplier for
liquid line length
All models
The data on
nameplate
Ensure Sections 7, 8, 9, 10, 11 and 12 have been completed.
Set System Thermostat to OFF.
1.
2.
Turn on disconnect to apply power to the indoor and outdoor units.
3.
Wait one (1) hour before starting the unit if compressor crankcase
heater is used and the outdoor ambient temperature is below 70 ºF.
4.
Set system thermostat to ON.
5.
OFF
D
ONE
CANCEL
Figure 32
ON
OFF
Figure 33
60 MIN.
Figure 34
D
ONE
CANCEL
TUE
EM HEAT
OFF
COOL
Following
Schedule
Inside
Set To
Figure 35
The factory charge in the outdoor unit is sufficient for 15 feet of
standard size interconnecting liquid line.
1. Total Line Length (ft)
2. Standard Line set (ft)
3. (a) minus (b)
4. Refrigerant Multiplier
5. Refrigerant Adder (c*d)
*If lineset is less than 15 feet, (e) = 0
New Installations — Calculating additional charge for lineset
greater than 15 feet.
= (a)
= 15
(b)
= (c)
=
(d)
= (e*)