ICU CONDENSING UNIT INSTALLATION MANUAL
September2003:E\Manuals\Others\Qualitair\ICC\0412118 11
7.5 ICU – RECOMMENDED LINE SIZES
R407 Cooling Units
ICU30 ICU40 ICU55 ICU80 ICU100 ICU135 ICU170
Base Charge (g) 600 1100 1600 1900 2800 3700 4500
R407c heat pump units are supplied with a holding charge of Nitrogen only.
Horizontal or Downflow application (Suction Line)
Upflow application (Suction Line)
Based on 5psi (0.35bar) Pressure drop Line Length (m)
Max Max R407c – kg
Table A
5 10 15 20 25 30 35 40 45 50 60 70 80 90 100
Table B
Size Lift Additional Oil Additional Charge
ICU30
Suction
3/8”
½” ½” ½” ½”
5/8”
¾” Suction
3/8”
5 None >5m = 25g/m (¼” Liquid)
Liquid ¼” ¼” ¼” ¼” ¼” ¼” DO NOT USE THIS AREA
ICU40
Suction ½” ½” ½”
5/8” 5/8” 5/8”
¾” Suction ½” 15 None >5m = 25g/m (¼” Liquid)
Liquid ¼” ¼” ¼” ¼” ¼” ¼” DO NOT USE THIS AREA
ICU55
Suction ½”
5/8” 5/8” 5/8” 5/8”
¾”
¾” ¾” ¾” ¾” ¾” 7/8” 7/8” 7/8” 7/8”
Suction ½” 8 None >5m = 40g/m (3/8” Liquid)
Liquid
3/8” 3/8” 3/8” 3/8” 3/8” 3/8”
½” ½” ½” ½” ½” ½” ½” ½” ½” >30m = 105g/m (1/2” liquid)
ICU80
Suction
5/8” 5/8”
¾” ¾” ¾” ¾”
7/8” 7/8” 7/8” 7/8” 7/8” 7/8” 7/8” 7/8” 11/8”
Suction ¾” 30 None >5m = 40g/m (3/8” Liquid)
Liquid
3/8” 3/8” 3/8” 3/8”
½” ½” ½” ½” ½” ½” ½” ½” ½” ½” ½” >30m = 105g/m (1/2” liquid)
ICU100
Suction
5/8”
¾” ¾”
7/8” 7/8” 7/8” 7/8” 7/8”
11/8” 11/8” 11/8” 11/8” 11/8” 11/8” 11/8”
Suction
7/8”
35 None >5m = 105g/m (1/2” Liquid)
Liquid ½” ½” ½” ½” ½”
5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8”
>25m = 175g/m (5/8” liquid)
ICU135
Suction ¾” ¾”
7/8” 7/8” 7/8”
11/8 11/8” 11/8” 11/8” 11/8 11/8 11/8” 11/8” 11/8” 11/8”
Suction
7/8”
24 None >5m = 105g/m (1/2” Liquid)
Liquid ½” ½” ½” ½” ½”
5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8”
>25m = 175g/m (5/8” liquid)
ICU170
Suction ¾”
7/8”
11/8” 11/8” 11/8” 11/8” 11/8” 11/8” 11/8” 11/8 13/8 13/8 13/8 13/8 13/8
Suction
11/8”
50 None >5m = 105g/m (1/2” Liquid)
Liquid ½” ½” ½” ½” ½”
5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8” 5/8”
>25m = 175g/m (5/8” liquid)
Note:
a) = DO NOT USE IN THIS AREA.
b) Crankcase heaters are require d where system charge exceeds 4.5kg and DOES NOT contain an accumulator.
c) Maximum pipe run stated in Table A, must include the reduction allowance (equivalent length) for vertical lifts and fittings indicated in Tables in this section.