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Main Electrical Power Requirements
[ ] Verify that the power supply complies
with the unit nameplate specifica-
tions.
[ ] Inspect all control panel components;
tighten any loose connections.
[ ] Connect properly sized and pro-
tected power supply wiring to a field-
supplied/installed disconnect switch
and to the main power terminal block
(HTB1) in the unit control panel.
[ ] Install proper grounding wires to an
earth ground.
Note:
All field-installed wiring must comply
with applicable State and Local codes.
Requirements for Gas Heat
[ ] Gas supply line properly sized and
connected to the unit
gas train.
[ ] All gas piping joints properly sealed.
[ ] Drip leg Installed in the gas piping
near the unit.
[ ] 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. (3.5 kPa) to prevent compo-
nent failure.
[ ] Minimum gas supply pressure should
be 4.5" W.C. (1.1 kPa).
[ ] Maximum gas supply pressure must
not exceed 14.0" W.C.(3.5 kPa).
[ ] Manifold pressure for single stage
heaters should be set to 3.3" W.C.
(.8 kPa).
[ ] Manifold pressure for two stage heat-
ers should be set to 3.5" W.C. (.9
kPa) on HIGH FIRE. The low fire set-
ting is not field adjustable.
[ ] Flue Exhaust clear of any obstruc-
tion.
RT-SVX31A-EN
Installation
Condensate Drain Configuration
An evaporator condensate drain con-
nection is provided on each unit. Refer
to Figure 4-1 for the appropriate drain
location.
The condensate drain pan is factory in-
stalled to drain condensate to the back
side of the unit. See Figure 4-1. 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 sup-
port panel and push until the cou-
pling 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 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 posi-
tion 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.
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 conden-
sate 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 be-
ing on the "negative pressure" side of
the fan. Install the P-Trap using the
guidelines in Figure 5.
A condensate drain line must be con-
nected to the P-Trap. Pitch the drain
lines at least 1/2 inch (13 mm) for every
10 feet (3.0 m) of horizontal run to as-
sure proper condensate flow. Do not al-
low the horizontal run to sag causing a
possible double-trap condition which
could result in condensate backup due
to "air lock".
Figure 5
Condensate Trap Installation
21
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