Installation guide

| Split System Condensers Installation Instructions §
Start-Up Procedure
Start-up Procedure
1. Close electrical disconnects to energize system.
2. Energize crankcase heater on units so equipped.
3. Set Thermostat selector switch to OFF.
4. Set room thermostat at desired temperature. Be sure
setpoint is below indoor ambient temperature for cooling
and above indoor ambient for heating.
5. Setthe system switch of the thermostat on COOL and
fan switch for continuous operation or AUTO, as desired.
Operate unit for 15-20 minutes, then check the system re-
frigerant charge if it was necessary to adjust.
6. After the refrigerant charge has been adjusted, the sys-
tem is now ready for continuous operation.
Final Refrigeration Charge Adjustment
Before any adjustment is made to the refrigerant charge, it
is imperative that the air flow characteristics of the indoor
blower be established.
When checking indoor air flow, it is important to remember
that the blower will deliver a higher quantity of air across a
dry coil versus a wet coil. Blower charts are calculated with
a dry coil.
Recommended air flow for installations of cooling units and
heat pumps is 350-450 CFM per ton (12,000 BTUH)
through a wei coil. Refer to indoor unit installation instruc-
tions for proper methods of determining air flow and blower
performance.
To Check System Refrigerant Charge
(Superheat Method), Cooling Only
1. Attach an accurate temperature sensing device to the
suction line approximately 4” - 6” away from the suction
line service valve. The temperature sensing device should
be clamped securely to the suction line, on a horizontal
plane (between 9 & 3 O'clock) and insulated. Record the
suction line temperature.
2. Measure and record the suction line refrigeration pres-
sure. (Measure at the suction line service valve gauge
port.) Using Temperature / Pressure Chart convert this
pressure to the saturation refrigerant temperature. The dif-
ference between actual and saturated temperatures is the
amount of superheat.
Figure 9 - Temperature / Pressure Chart
Temper | PSIG | Temper | PSIG | Temper | PSIG
ature °F] R-22 | ature°F| R-22 | ature°F| R-22
-6 19.3 19 41.9 41 70.0
-4 20.8 20 43.0 42 71.4
-2 22.4 21 44.4 43 73.0
0 24.0 22 45.3 44 74.5
1 24.8 23 46.4 45 76.0
2 25.6 24 47.6 46 77.6
3 26.4 25 48.8 47 79.2
4 27.3 26 49.9 48 80.8
5 28.2 27 51.2 49 82.4
6 29.1 28 52.4 50 84.0
7 30.0 29 53.6 55 92.6
8 30.9 30 54.9 60 101.6
9 31.8 31 56.2 65 111.2
10 32.8 32 57.5 70 121.4
re 33.7 33 58.8 75 132.2
12 34.7 34 60.1 80 143.6
13 35.7 35 61.5 85 155.7
14 36.7 36 62.8 90 168.4
15 37.7 37 64.2 95 181.8
16 38.7 38 65.6 100 195.9
17 39.8 39 67.1 105 210.8
18 40.8 40 68.5 110 226.4
115 242.7
3. Measure and record the outside ambient air tempera-
ture.
4. Optimum performance will be achieved when the oper-
ating charge produces 15°-20° F suction superheat at
compressor with 82° F outdoor ambient and 80° F dry bulb
(67° F wet bulb) indoor temperature (ARI “B” test condi-
tions) at rated airflow. If these conditions cannot be ob-
tained, compare the calculated superheat value with the
recommended valves given in Figure 10.
Figure 10 - Recommended Superheat Values
Outside Air Superheat °F
Temp ° F Variator or Piston
65 38 -45
75 27 - 33
85 20 - 25
95 10-15
105 2-6
Ifthe actual superheat readings are higher than shown, the
system is most likely under-charged, and charge should
be added. Add charge in 4 ounce increments, and recalcu-
late superheat values. Continue adjusting charge until the
actual superheat approximately matches the recom-
mended values.
Ifthe actual superheat readings are lower than shown, the
system is most likely over-charged, and charge should be
removed. Remove charge in 4 to 6 ounce increments, and
recalculate superheat values. Continue adjusting charge
until the actual superheat approximately matches the rec-
ommended values.
Lo]