49
SERVICING
The following table shows refrigerant amount for every 5 feet of line.
15 (Factory Charge) 139 139 160 237
20 142 142 163 240
25 145 145 166 243
30 148 148 169 246
35 151 151 172 249
40 154 154 175 252
45 157 157 178 255
50 160 160 181 258
55 163 163 184 261
60 166 166 187 264
65 169 169 190 267
70 172 172 193 270
75 175 175 196 273
80 178 178 199 276
85 181 181 202 279
90 184 184 205 282
95 187 187 208 285
100 190 190 211 288
Unit Tonnage
Actual Line Set
Length (ft.)
2-Ton 3-Ton 4-Ton 5-Ton
Refrigerant (Oz.)
Initial Refrigerant for Given Line Length
S-202 DUCT STATIC PRESSURES AND/OR STATIC PRESSURE
DROP ACROSS COILS
This minimum and maximum allowable duct static pressure for
the indoor sections are found in the specifications section.
Tables are also provided for each coil, listing quantity of air (CFM)
versus static pressure drop across the coil.
Too great an external static pressure will result in insufficient air
that can cause icing of the coil. Too much air can cause poor
humidity control and condensate to be pulled off the indoor coil
causing condensate leakage. Too much air can also cause motor
overloading and in many cases this constitutes a poorly designed
system.
S-203 AIR HANDLER EXTERNAL STATIC
To determine proper air movement, proceed as follows:
1. Using a draft gauge (inclined manometer), measure the static
pressure of the return duct at the inlet of the unit, (Negative
Pressure).
2. Measure the static pressure of the supply duct, (Positive Pres-
sure).
3. Add the two readings together.
TOTAL EXTERNAL STATIC
NOTE: Both readings may be taken simultaneously and read di-
rectly on the manometer if so desired.
4. Consult proper table for quantity of air.
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