Rigging/Lifting Of Unit; Connect Condensate Drain; Install Duct Connections; Configuring Units For Downflow (Vertical) Discharge - Bryant Legacy 704D--A Installation Instructions Manual

WARNING
!
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal
When straps are taut, the clevis should be a minimum of 36
in. (914 mm) above the unit top cover.
Rigging/Lifting of Unit (See Fig. 5)
WARNING
!
UNIT FALLING HAZARD
Failure to follow this warning could result in personal
injury or death.
Large base units must be secured to common curb before
allowing full weight of unit to rest on curb. Install screws
through curb into unit base rails while rigging crane is still
supporting unit.
Lifting holes are provided in base rails as shown.
1. Attach shackles, clevis pins, and straps to the base rails of
the unit. Be sure materials are rated to hold the weight of the
unit (See Fig. 5).
2. Attach a clevis of sufficient strength in the middle of the
straps. Adjust the clevis location to ensure unit is lifted level
with the ground.
After the unit is placed on the roof curb or mounting pad, remove
the top skid.
OPTIONAL
RETURN
AIR
OPENING
2˝
(50.8mm)
EVAP. COIL
Fig. 7 - - Slab Mounting Detail
Step 6 — Connect Condensate Drain
NOTE: When installing condensate drain connection be sure to
comply with local codes and restrictions.
Model 704D- -- -A disposes of condensate water through a 3/4 in.
NPT fitting which exits through the base on the evaporator coil
access side. See Fig. 2 and 3 for location.
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 2- -in. (51 mm)
condensate trap at end of condensate connection to ensure proper
drainage. Make sure that the outlet of the trap is at least 1 in. (25
mm) lower than the drain pan condensate connection to prevent the
pan from overflowing (See Fig. 8). When using a gravel apron,
make sure it slopes away from the unit.
Connect a drain tube using a minimum of 3/4 - -in. PVC or 3/4 - -in.
copper pipe (all field- -supplied) at the outlet end of the 2- -in. (51
mm) trap. Do not undersize the tube. Pitch the drain tube
downward at a slope of at least 1- -in. (25 mm) for every 10 ft (3.1
m) of horizontal run. Be sure to check the drain tube for leaks.
Prime trap at the beginning of the cooling season start- -up.
OPTIONAL
SUPPLY
AIR
OPENING
COND. COIL
A07926
1-in. (25 mm) min.
Fig. 8 - - Condensate Trap
Step 7 — Install Duct Connections
The design and installation of the duct system must be in
accordance with the standards of the NFPA for installation of
non- -residence type air conditioning and ventilating systems,
NFPA 90A or residence type, NFPA 90B and/or local codes and
ordinances.
Select and size ductwork, supply- -air registers, and return air grilles
according to ASHRAE (American
Refrigeration, and Air Conditioning Engineers) recommendations.
The unit has duct flanges on the supply- - and return- -air openings
on the side of the unit.
When designing and installing ductwork, consider the following:
1. All units should have field- -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.
(610 mm) 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
(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.
CONFIGURING UNITS FOR DOWNFLOW
(VERTICAL) DISCHARGE
WARNING
!
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.
1. Open all electrical disconnects and install lockout tag before
starting any service work.
7
TRAP
OUTLET
2-in. (51 mm) min.
A09052
Society of Heating,
National Association