Start-Up Procedure; Refrigerant Charge; Required Liquid Line Temperature Table - Payne PA13NR018 Installation Instructions Manual

START-UP PROCEDURE
1. Set indoor thermostat selector switch to OFF.
2. Turn ON all electrical disconnect devices.
3. If unit has a crankcase heater, energize the heater and wait
24 hours before proceeding.
4. Set indoor thermostat at desired temperature. Be sure set-
point is below indoor ambient temperature or thermostat
will not call for cooling.
5. Set indoor thermostat selector switch to COOL. Operate
unit for minimum 15 nfinutes, then check system refrigerant
charge.
REFRIGERANT CHARGE
Table 1 shows the suggested refrigerant charge quantities for a 15
foot (4.6 m) lineset. If shorter or longer refrigerant lines or a
different indoor coil are used, the charge will have to be adjusted.
For different line lengths, add or remove charge based on 0.6
ounces (17 g) charge per foot (305 ram) of difference. For
example, a 25 foot (7.6 m) line set is 10 feet (3 m) longer than the
specified 15 feet (4.6 m). Add 0.6 ounces (17 g) charge for each of
the extra 10 feet (3 m):
10 x 0.6 = 6.0 ounces additional charge
(3 m x 17 g = 51 g additional charge)
The initial charge should be weighed into the system per Table 1
and the additional amount for the length of line set. Then check
subcooling.
This outdoor unit is designed for use only with indoor coils that
utilize a TXV refrigerant metering device. With an indoor TXV,
use the subcooling method to make final charge adjustments:
NOTE: Only use subcooling charging method when the following
is true:
• outdoor ambient temperature is between 70°F and 100°F
(21°C and 38°C)
• indoor temperature is between 70 ° and 80°F
(21 °C and 27°C)
• line set is less than 80 feet (24.4 m).
1. Operate unit a minimum of 15 nfinutes before checking
charge.
NOTE: If outdoor unit has a 2-speed fan motor, motor will
operate in low speed when outdoor ambient temperature is
below 82°F (28°C). Pull one of the yellow low voltage
wires off the fan control and the unit will default to high
speed fan for servicing. Reconnect wire after servicing.
2. Measure liquid service valve pressure by attaching an
accurate gauge to service port.
3. Measure liquid line temperature by attaching an accurate
thernfistor type sensor or electronic thermometer to liquid
line near outdoor coil.
4. Refer to unit rating plate for required subcooling temperat-
ure.
5. Refer to Table 2. Find the required liquid line temperature
where the rating plate subcooling temperature intersects
measured liquid service valve pressure.
6. If the measured liquid line temperature is higher than the
chart number, add refrigerant to lower the measured temper-
ature.
NOTE: When adding refrigerant, charge in liquid form,
using a flow restricting device, into the suction port.
If the measured liquid line temperature is lower than the
chart number, reclaim refrigerant to raise the measured
temperature.
Tolerance is _+3 °F (_+ 1.7 ° C).
Table 1--Suggested Refrigerant Charge Quantity
for 15 foot (4.6 m) Lineset
Model Number Ibs. (kg)
PA13NR018 3.56 (1.62)
PA13NR024 4.08 (1.85)
PA13NR030 4.11 (1.87)
PA13NR036 5.35 (2.43)
PA13NR042 7.01 (3.19)
PA13NR048 8.88 (4.04)
PA13NR060 10.52 (4.79)
Measured Liquid
Pressure (psig)
163
171
179
187
196
205
214
223
233
243
253
264
274
285
297
309
o F
5
83
86
89
92
95
98
101
104
107
110
113
116
119
122
125
128
Table 2--Required Liquid Line Temperature
Rating Plate (required) Subcooling Temperature ° F (° C)
oF o F
10 15
R-22 Required Liquid Line Temperature ° F (° C)
78
81
84
87
90
93
96
99
102
105
108
111
114
117
120
123
73
76
79
82
85
88
91
94
97
1O0
103
106
109
112
115
118
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o F
20
68
71
74
77
80
83
86
89
92
95
98
101
104
107
110
113