Fig. 1 - Area Not to be Drilled More Than 3/4 in. (19.1 mm) Deep.
IMPORTANT
: Use flexible connectors between ductwork and unit to prevent transmission of vibration. Use suitable
gaskets to ensure weather tight and airtight seal. When electric heat is installed, use fireproof canvas (or similar heat
resistant material) connector between ductwork and unit discharge connection. If flexible duct is used, insert a sheet
metal sleeve inside duct. Heat resistant duct connector (or sheet metal sleeve) must extend 24-in. (610 mm) from
electric heater element.
Duct Flanges - Factory Installed (See Fig. 2);
For 36 size:
S Four "L" brackets are factory installed.
Supply air duct: Two "L" brackets 9.7-in. x 15.5-in.
Return air duct: Two "L" brackets 13.7-in. x 14-in.
For 48 and 60 sizes:
S Four "L" brackets are factory installed.
Supply air duct: Two "L" brackets 9.7-in. x 15.5-in.
Return air duct: Two "L" brackets 14-in. x 20-in.
Fig. 2 - Factory Installed Duct Flanges
Table 1 – Minimum Airflow for Safe Electric Heater Operation
Unit
50ZPM
Minimum Airflow (CFM)
4.6 kW
6.9 kW
9.2 kW
13.8 kW
18.4 kW
36
600
750
750
1050
X
48
600
750
750
1050
1600
60
600
750
750
1050
1600
X = Not Approved Combination
CONFIGURING UNITS FOR DOWNFLOW (VERTICAL) DISCHARGE
Units are dedicated side supply products. They are not convertible to vertical air supply. A field-supplied plenum must
be used to convert to vertical air discharge.
Step 5 — Connect Condensate Drain
NOTE
: When installing condensate drain connection be sure to comply with local codes and restrictions.
Unit removes condensate through a 1-3/64-in. (26.6 mm) ID hole (using 3/4-in. (19 mm) ID piping or tubing) which is
located at the end of the unit. See Base Unit Dimensions for location of condensate connection.
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