Mechanical And Electrical Installation; Mechanical Installation - Grundfos CU 321 Installation And Operating Instructions

2. Mechanical and electrical
installation
WARNING!
It can be extremely dangerous to touch
the electrical parts even when the mains
supply has been disconnected.
Wait at least 4 minutes after the input
power has been removed before servicing
the CU 321.
For outdoor installation, the CU 321 must
be installed in a minimum NEMA 3R enclo-
sure with provisions for heating and venti-
lating designed to keep the CU 321 within
its operating temperature limits.
2.1 Mechanical installation (3 hp, 1-/3-ph, and 5 hp, 3-ph)
All dimensions are in inches.
Fig. 6 Dimensional sketch of CU 321 (without the NEMA 1 kit)
Spacing
If more than one CU 321 is installed, the following
must be observed during mechanical installation.
IMPORTANT
The CU 321 is cooled by air circulation. For proper
cooling, allow a minimum of 4 inches (100 mm) of
open space above, below and beside the CU 321
to protect the unit from overheating.
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