41
Indoor unit 181 251
Suction line
mm Sx 45 45
mm Sy 119 120
mm Sz 278 253
Injection line
mm Ex 113 113
mm Ey 133 120
mm Ez 211 245
Sx
Ey
Ex
Sz
Ez
Sy
55 70 70
120 70
2 x 50
4 x 32
x
z
y
B A
© STULZ GmbH – all rights reserved EN/01.2019/G22
EC TOWER TECHNICAL MANUAL
Indoor unit 181 251
Outdoor unit FDC 140 VSX/VSA FDC 200 VSA FDC 250 VSA
Connection of suction line inches 7/8" UNF** 22 mm / 28 mm*
Connection of injection line inches 5/8" UNF** 3/4" UNF**
Indoor unit 181 251
Outdoor unit FDC 140 VSX/VSA FDC 200 VSA FDC 250 VSA
Suction line mm/inches 16/5/8" 22 / 7/8" / 25 or 28* 22 / 7/8" / 25 or 28*
Injection line mm/inches 10/3/8" 10/3/8" 12/1/2"
Upflow ECU 181/251
In Upflow units, the refrigerant pipes are routed out of the unit through holes in the left-hand side panel. The
holes have the dimensions stated below. The point of reference is the rear left corner at the bottom.
Diameter of refrigerant pipes
Diameter of connections
* Solder lug. Diameter 25 or 28 mm if the length of the refrigerant pipe is at least 35 m.
** Flared joint.
Connection dimensions
The locations of the pipe connections have a toleran-
ce of ± 10 mm.
View A:View B:
View from rear:
All dimensions in mm.
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