Installation
RT-SVX21N-EN 31
• 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
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 16, p. 22 and Figure 17, p. 23
for the appropriate drain location.
The condensate drain pan is factory installed to drain
condensate to the back side of the unit. See Figure 16, p. 22
and Figure 17, p. 23. 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. Replace evaporator access panel and supply air access
panels.
To Convert Drain CondensateThrough-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 drain
pan to convert it to through-the-base drainage.
6. Plug the original condensate drain opening with a field
supplied 3/4” NPT plug.
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 37,
p. 31.
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”.
Drain Pan Removal (Units with Condensate
Overflow Switch Option)
Before drain pan removal, the switch wire must be
disconnected from wire tie on panel and/or any tape
before drain pan can be removed.
Care must be taken so the wire does not catch on the
bottom of indoor coil or any protrusion.
Note: When reversing the drain pan, on some units, the
condensate overflow switch will need to be moved
to the second hole in its bracket to avoid contact
with headers or indoor coil.
Figure 37. Condensate trap installation
38.1
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