Start Up; System Start Up; System Charge Adjustment; Charging: Weigh-In Method - ComfortStar 18 Installation Manual

13 START UP

13.1 System Start Up

1. Ensure Sections 7, 8, 9, 10, 11, and 12 have been
completed.
2. Set System Thermostat to OFF.
OFF
DONE
Figure 13-1
3. Turn on disconnect to apply power to the indoor and
outdoor units.
ON
OFF
Figure 13-2
4. Wait one (1) hour before starting the unit if compressor
crankcase heater is used and the outdoor ambient
temperature is below 70 ºF.
60 MIN.
Figure 13-3
5. Set system thermostat to ON.
TUE
Inside Set To
EM HEAT
OFF
COOL
DONE
Figure 13-4
CANCEL
Following
Schedule
CANCEL
12
14 SYSTEM CHARGE
ADJUSTMENT

14.1 Charging: Weigh-In Method

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 suction line pressure charging method.
Model Factory Charge
5/16''
The data on
All models
nameplate
0.4 oz/ft
Table 14-1
NOTE
The factory charge in the outdoor unit is
sufficient for 15 feet
interconnecting liquid line.
New Installations — Calculating additional charge for
lineset greater than 15 feet.
1. Total Line Length (ft)
2. Standard Lineset (ft)
3. (a) minus (b)
4. Refrigerant Multiplier
5. Refrigerant Adder (c*d)
*If lineset is less than 15 feet, (e) = 0
Sealed-System Repairs — Calculating total system
charge.
1. Total Line Length (ft)
2. Standard Lineset (ft)
3. (a) minus (b)
4. Refrigerant Multiplier
5. Refrigerant Adder (c*d)
6. Factory Charge (namplate)
7. Total System Charge (e+f)
*If lineset is less than 15 feet, (e) = 0
NOTE
The only mode approved for validating system
charge is while in Cooling Mode. Outdoor
Temperature must be between 55°F and 115°F
with Indoor Temperature kept between 70°F and
80°F.
Charge multiplier for
liquid line length
3/8'' 1/2''
0.6 oz/ft 1.2 oz/ft
of standard size
= _________(a)
15
= _________(b)
= _________(c)
= _________(d)
= _________(e)*
= _________(a)
15
= _________(b)
= _________(c)
= _________(d)
= _________(e)*
= _________(f)
= _________
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