Requirements For Gas Heat - American Standard YSC036A Installation, Operation And Maintenance Manual

Installation
4. Using pipe sealant, attach the 6
1/2" nipple and gas shutoff
assembly to the 90° elbow on the
gas supply line.
5. Using pipe sealant, attach the 5"
pipe nipple and union to the
street el attached to the gas
valve.
6. Connect 5" pipe nipple and union
to 6 1/2" nipple and gas shutoff
assembly.
Figure 24. Typical through the base
gas installation
Requirements for Gas
Heat
Note: The unit gas train and
Optional Through The Base
Gas Shut-Off Valve are rated
at 1/2 PSIG maximum. A
pressure reducing regulator
is recommended to prevent
this maximum from being
exceeded. These components
must be isolated during field
gas piping test that exceed
1/2 PSIG. It is recommended
that the field piping be
capped prior to the unit gas
train or Optional Through
The Base Gas Shut-Off Valve
if present.
• Gas supply line properly sized
and connected to the unit gas
train.
• All gas piping joints properly
sealed.
• Gas piping leak checked with a
soap solution. If piping
connections to the unit are
complete, do not pressurize
RT-SVX21F-EN
piping in excess of 0.50 psig or
14 " W.C. to prevent component
failure.
• Drip leg Installed in the gas
piping near the unit.
• Minimum gas supply pressure
should be 4.5" W.C.
• Maximum gas supply pressure
must not exceed 14.0" W.C.
• Manifold pressure for single
stage heaters should be set to
3.3" W.C.
• Manifold pressure for two stage
heaters should be set to 3.5"
W.C. on HIGH FIRE and 1.8" W.C.
on LOW FIRE.
• Flue Exhaust clear of any
obstruction.
Condensate Drain
Configuration
An evaporator condensate drain
connection is provided on each unit.
Refer to Figure 8, p. 18 and
p. 19 for the appropriate drain
location.
The condensate drain pan is factory
installed to drain condensate to the
back side of the unit. See Figure 8,
p. 18 and Figure 10, p. 19. It can be
converted to drain condensate out
the front side of the unit or through
the base.
To convert drain condensate out the
front of unit:
1. Remove evaporator access
panel and supply air access
panels.
2. Remove the support panel that
the condensate drain pan exits
through.
3. Slide the condensate drain pan
out of the unit and rotate 180°.
4. Slide the condensate drain pan
back into the unit, align the drain
with the grommeted opening in
the rear support panel and push
until the coupling is seated in the
grommet.
5. Replace the front support panel
by aligning the panel with tabs in
the raceway. Align the
condensate drain pan support in
the grommeted hole as the panel
is put in place.
6. 6. Replace evaporator access
panel and supply air access
panels.
To convert drain condensate
through the base of unit:
1. Remove evaporator access
panel and supply air access
panels.
2. Remove the support panel that
the condensate drain pan exits
through.
3. Slide the condensate drain pan
out of the unit.
4. Place on a level surface in the
position it was removed from the
unit.
5. Remove the plug knockout in the
bottom of the drainpan to
convert it to through the base
drainage.
6. Plug the original condensate
drain opening with a field
supplied 3/4" NPT plug.
Figure 10,
7. Slide the condensate drain pan
back into the unit, align the drain
support with the grommeted
opening in the rear support
panel and push until the support
is seated in the grommet.
8. Replace the front support panel
by aligning the panel with tabs in
the raceway. Align the plugged
condensate drain pan coupling
in the grommeted hole as the
panel is put in place.
9. Replace evaporator access panel
and supply air access panels.
A condensate trap must be installed
at the unit due to the drain
connection being on the "negative
pressure" side of the fan. Install the
P-Trap using the guidelines in
Figure 25, p.
A condensate drain line must be
connected to the P-Trap. Pitch the
drain lines at least 1/2 inch for every
10 feet of horizontal run to assure
proper condensate flow. Do not allow
the horizontal run to sag causing a
possible double-trap condition which
could result in condensate backup
due to "air lock" .
26.
25