PMGB0406B rev.1
15
There are several ways to handle the supply and return air duct connections. The location and sizing of the
connections depends on the situation and the method best suited to the installation. UpÀ ow, horizontal or
downÀ ow applications may be used.
Properly size the supply air duct by use of a transition to match unit opening. Refer to Table 1 for air handler
unit inlet and outlet dimensions.
Use 1/2” screws to connect duct work to unit. Longer screws will pierce the drain pan and cause leakage. If
you drill pilot holes, drill only though ¿ eld duct and unit bottom duct À ange.
Duct work that is not designed to match the supply air opening can cause turbulence inside the plenum. This
turbulence can change the air À ow patterns across the electric heater limit switches. If the factory suggested
transition cannot be fabricated, it is recommended that you attach a block off plate to the supply opening (ap-
proximately 8" high and running the full width of the plenum). Refer to Figure 8. The use of this block off plate
enables better air circulation across the limit switches.
Air Filters
Return air ¿
lters are required and must be ¿
eld supplied. Filtration can be accomplished external to the unit or
the integral ¿ lter rack may be used. A 1" ¿ lter access rack is built into the unit. Remove the ¿ lter access cover.
Install proper size ¿ lter. Use a Standard 1" size permanent or throw away ¿ lter, or permanent washable ¿ lters
are available using model numbers: 1PF0601, 602 or 603. See Unit Data, section 11) for ¿ lter size.
Never operate equipment without ¿ lters.
5. Electronic Expansion Valve
When this air handler is used on a VRF (Variable Refrigerant Flow) system, an EEV (Electronic Expansion
Valve) is used. The EEV is included with the DX Kit that is shipped with the air handler.
Unit Connections
A0332-001
RECOMMENDED
TRANSITION
SUGGESTED LOCATION
OF BLOCK OFF PLATE
Figure 8 Duct Work Transition
(Ins)DX-Kit4e-rev1.inddC-15
(Ins)DX-Kit4e-rev1.inddC-15
2016/11/2515:32:21
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