12
ECU 12/2014 NEW
work.
The duct system must be engineered to insure sufficient air flow through the unit to prevent
over-heating of the heater element. This includes proper supply duct sizing, sufficient quantity of
supply registers, and adequate return and filter areas. Duct work must be of correct material and must
be properly insulated. Duct work must be constructed of galvanized steel with a minimum thickness
of .019 inches. Duct work must be firmly attached, secured, and sealed to prevent air leakage. See
section 2.4 for additional duct work requirements.
5.
Clearances:
Note the minimum clearances required for proper operation and service.
MODEL
MIN. CLEARANCE AROUND
SIDES (SINGLE UNIT)
MIN. CLEARANCE BETWEEN
UNITS (TWO UNITS)
MIN. SPACE
ABOVE UNIT
ECUA90/120
24 inches (76 cm)
18 inches (46 cm)
24 inches (61 cm)
Table 4. Minimum Clearances
6.
Codes:
Make sure your installation conforms to all applicable electrical, plumbing, building, and municipal
codes. Some codes may limit installation to single story structures.
7.
Electrical Supply:
The power supply must have the appropriate voltage, phase, and ampacity for the model selected.
Voltage must be maintained above minimum specified values listed below. Refer to the data sticker
on the unit for ampacity requirements.
Electrical Rating Designations*
A
C
D
Z
Nominal Voltage
208/230
208/230
460
575
Phase
1
3
3
3
Minimum Voltage
197
197
414
518
Maximum Voltage
253
253
506
600
* Letters refer to model number code designations. Refer to page 5.
Table 5. Voltage Limitations
2.3 Installation Materials
The ECU is shipped with a top bracket and lifting brackets. The top bracket provides a method of sealing
the top of the unit from water intrusion. The bracket is shipped attached to the top of the unit. Before
installing the ECU, remove the bracket and reattach as described in Section 2.5
The Lifting brackets are shipped attached to the back panel of the ECU. These brackets provide a method
for lifting the ECU. The installation of the brackets is described in Section 2.6.