3
When designing and installing ductwork, consider the following:
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to unit
components.
When connecting ductwork to units, do not drill deeper than
3/4 inch in shaded area shown in Fig. 2 or coil may be
damaged.
CAUTION
!
1. Allunitsshould havefield --supplied filters or accessory filter
rack installed in the return--air side of the unit.
Recommended sizes for filters are shown in Table 1.
2. 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 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. from electric
heater element.
3. Size ductwork for cooling air quantity (cfm). The minimum
air quantity for proper electric heater operation is listed in
Table 2. Heater limit switches may trip at air quantities below
those recommended.
4. Seal, insulate, and weatherproof all external ductwork. Seal,
insulate and cover with a vapor barrier all ductwork passing
through conditioned spaces. Follow latest Sheet Metal and
Air Conditioning Contractors National Association
(SMACNA) and Air Conditioning Contractors Association
(ACCA) minimum installation standards for residential
heating and air conditioning systems.
5. Secure all ducts to building structure. Flash, weatherproof,
and vibration-- isolate duct openings in wall or roof
according to good construction practices.
Figure 4 shows a typical duct system with 50ZPA unit installed.
19.17
3.92
A05195
Fig. 2 -- Area Not to be Drilled More Than 3/4--in.
CONFIGURING UNITS FOR DOWNFLOW (VERTICAL)
DISCHARGE
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before performing service or maintenance operations on the
system, turn off main power to unit and install lockout tag.
!
WARNING
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 6—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. ID hole (using
3/4-- in. OD piping or tubing) which is located at the end of the unit.
See Fig. 5 for location of condensate connection.
Condensate water can be drained directly onto the roof in rooftop
installations (where permitted) or onto a gravel apron in ground
level installations. Install a field--supplied condensate trap at end of
condensate connection to ensure proper drainage. Make sure that
the outlet of the trap is at least 1 in. lower than the drain pan
condensate connection to prevent the pan from overflowing (See
Fig. 3 and 4). When using a gravel apron, make sure it slopes away
from the unit.
If the installation requires draining the condensate water away from
the unit, install a 2 --in. trap using a 3/4-- in. OD tubing or pipe. (See
Fig. 3 and 4.) Make sure that the outlet of the trap is at least 1 in.
lower than the unit drain --pan condensate connection to prevent the
pan from overflowing. Prime the trap with water. Connect a drain
tube using a minimum of 3/4--in. PVC, 3/4-- in. CPVC, or 3/4--in.
copper pipe (all field supplied). Do not undersize thetube. Pitch the
drain tube downward at a slope of at least 1 in. for every 10 ft of
horizontal run. Be sure to check the drain tube for leaks. Prime trap
at the beginning of the cooling season start-- up. Allowable glues for
condensate trap connection are: Standard ABS, CPVC, or PVC
cement..
1” (25mm) MIN.
2” (50mm) MIN.
TRAP
OUTLET
C99013
Fig. 3 -- Condensate Trap
TRAP
OUTLET
2" min.
1" min.
C00009
Fig. 4 -- PVC Condensate Trap
50ZPA
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