Step 5 - Select And Install Ductwork - Payne PA1Z Installation, Start-Up And Service Instructions Manual

V. STEP 5 — SELECT AND INSTALL DUCTWORK
The design and installation of the duct system must be in
accordance with:
• the standards of the NFPA (National Fire Protection
Association) for installation of nonresidence-type air con-
ditioning and ventilating systems;
• NFPA 90A or residence-type, NFPA 90B; and/or local codes
and residence-type, NFPA 90B;
• and/or local codes and ordinances.
Select and size ductwork,
return-air grilles according to ASHRAE (American Society of
Heating, Refrigeration, and Air Conditioning Engineers) rec-
ommendations.
Use the duct flanges provided on the supply- and return-air
openings on the side of the unit. See Fig. 2-4 for connection
sizes and locations. The 14-in. round duct collars (size 024-
048 units) are shipped inside the unit attached to the indoor
blower. They are field-installed and must be removed from
the indoor cavity prior to start-up, even if they are not used
for installation.
A. Install Flanges for Ductwork Connections (PA1Z060 Only)
The PA1Z060 units are shipped with flanges which must be
field-installed on the unit.
To install unit flanges:
1. Five pieces of flange are shipped on the return-air open-
ing of the unit. Remove the flanges from the shipping
position. See Fig. 5. Screws are field-supplied.
2. One piece of flange is used as it is shipped (straight).
Bend the other 4 pieces at right angles.
3. Install the straight flange on the right side of the
return air opening in holes provided. See Fig. 6. Flanges
should stick out from unit to allow for connection of
ductwork.
4. Install 2 hand-formed flanges onto return air opening
in holes provided to form a rectangle around the return
air opening.
5. Install remaining 2 hand-formed flanges around dis-
charge air opening in holes provided.
6. Ductwork can now be attached to flanges.
Fig. 5 — Shipping Location of Duct Flanges
(Size 060 Only)
supply-air registers and
When designing and installing ductwork, consider the
following:
CAUTION: When connecting ductwork to units, do
not drill deeper than
Fig. 7 or coil may be damaged.
• All units should have field-supplied filters installed in the
return-air side of the unit. Recommended sizes for filters
are shown in Table 1.
• Avoid abrupt duct size increases and reductions. Abrupt
change in duct size adversely affects air performance.
IMPORTANT: Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gas-
kets to ensure weathertight and airtight seal.
• Size ductwork for cooling air quantity (cfm). The mini-
mum air quantity for proper electric heater operation is
listed in Table 2. Heater limit switches may trip at air quan-
tities below those recommended.
Fig. 6 — Flanges Installed on PA1Z060 Units
19.17"
Fig. 7 — Area Not to be Drilled More than
—6—
⁄ inch in shaded area shown in
3
4
3.92"
3
⁄ -in.
4