10
1. Open all electrical disconnects before starting any service
work.
2. Remove horizontal (metal) duct covers to access vertical
(downflow) discharge duct knockouts in unit basepan. (See
Fig. 8.)
Horizontal Duct Covers
A09076
Basepan
Downflow
(Vertical)
Supply
Knockout
Basepan
Downflow
(Vertical)
Return
Knockout
A09077
Fig. 8 -- Supply and Return Duct Opening
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Collect ALL screws that were removed.
Do not
leave screws
on rooftop as permanent damage to the roof may occur.
CAUTION
!
To remove downflow return and supply knockout covers, break
front and right side connecting tabs with a screwdriver and
hammer. Push cover down to break rear and left side tabs.
NOTE
: These panels are held in place with tabs similar to an
electrical knockout. Reinstall horizontal duct covers (see Fig. 8)
shipped on unit from factory. Insure openings are air and
watertight.
NOTE
: 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.
Provide for Condensate Disposal
NOTE
: Ensure that condensate--water disposal methods comply
with local codes, restrictions, and practices.
The units dispose of condensate through a 3/4 --in. NPT female
fitting that exits on the compressor end of the unit. 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. (25 mm) lower than the
drain--pan condensate connection to prevent the pan from
overflowing. Prime the trap with water. 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 field--supplied 2--in. (51 mm) trap at the
condensate connection to ensure proper drainage. Condensate trap
is available as an accessory or is field--supplied. Make sure that the
outlet of the trap is at least 1 in. (25 mm) lower than the unit
drain--pan condensate connection to prevent the pan from
overflowing. Connect a drain tube using a minimum of
field--supplied 3/4 --in. PVC or field--supplied 3/4 --in. copper pipe
at outlet end of the 2 --in. (51 mm) trap (See Fig. 9). 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 m) of horizontal run. Be sure
to check the drain trough for leaks. Prime the trap at the beginning
of the cooling season start--up.
TRAP
OUTLET
1-in. (25 mm) min.
2-in. (51 mm) min.
A09052
Fig. 9 -- Condensate Trap
Install Flue Hood
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
The venting system is designed to ensure proper venting.
The flue hood assembly must be installed as indicated in
this section of the unit installation instructions.
!
WARNING
Install the flue hood as follows:
1. This installation must conform with local building codes
and with the National Fuel Gas Code (NFGC), NFPA 54
/ANSI Z223.1--2009 (in Canada, CAN/CSA B149.1, and
B149.2) latest revision. Refer to provincial and local
plumbing or wastewater codes and other applicable local
codes.
2. Remove flue hood from shipping location (inside the return
section of the blower compartment--See Fig. 8). Remove the
return duct cover to locate the flue hood. Remove two
screws on flue panel. Place flue hood assembly over flue
panel. Orient screw holes in flue hood with holes in the flue
panel.
3. Secure flue hood to flue panel by inserting a single screw on
the top and the bottom of the hood.
Install Gas Piping
The gas supply pipe enters the unit through the access hole
provided. The gas connection to the unit is made to the 1/2--in.
FPT gas inlet on the gas valve.
Install a gas supply line that runs to the heating section. Refer to
Table 2 and the current edition of NFGC in the U.S. and the current
NSCNGPIC in Canada. Do not use cast--iron pipe. It is
recommended that a black iron pipe is used. Check the local utility
for recommendations concerning existing lines. Size gas supply
piping for 0.5 IN. W.C. maximum pressure drop. Never use pipe
smaller than the 1/2--in. FPT gas inlet on the unit gas valve.
For natural gas applications, the gas pressure at unit gas connection
must not be less than 4.0 IN. W.C. or greater than 13 IN. W.C.
while the unit is operating. For propane applications, refer to
propane conversion kit instructions.
677D
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A
