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Installation
Due to the size of these units, all condensate drain
connections must be connected to the evaporator drain
connections.
Refer to the appropriate illustration in for the location of
these drain connections.
A condensate trap must be installed due to the drain
connection being on the "negative pressure" side of the
fan. Install the P-Traps at the unit using the guidelines in
Figure 14, p.
32.
Figure 14. Condensate trap installation
Condensate Channel
(Evaporator Section)
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".
Figure 15. Condensate drain locations
Units with Gas Furnace
Units equipped with a gas furnace have a 3/4" CPVC drain
connection stubbed out through the vertical support in the
gas heat section. It is extremely important that the
condensate be piped to a proper drain. Refer to the
appropriate illustration in for the location of the drain
connection.
32
Base Rail
1" NPT (S_HL and S_HG units)
Connection
Field Supplied
Condensate Piping
4.5"
2.25"
Cleanout
Plug
Condensate drain
openings both sides
Note:
Each drain pan connection must be trapped.
The drains may be trapped individually or
connected and then trapped.
Note: Units equipped with an optional modulating gas
furnace will likely operate in a condensing mode part
of the time.
An additional 1–1/4" non-connectable water drain is
located in the base rail within the heating section. Ensure
that all condensate drain line installations comply with
applicable building and waste disposal codes.
Note: Installation on gas heat units will require addition of
heat tape to the condensate drain.
Removing Supply and Relief/
Return Fan Shipping Channels
(motors >5 Hp)
Each FC supply fan assembly and relief fan assembly for
S_H_ units shipped with a motor larger than 5 HP is
equipped with rubber isolators (as standard) or optional
spring isolators. Each DDP supply fan assembly for SAH_
and SXH_ units is equipped with spring isolators. Each
return fan assembly for units shipped with a motor larger
than 5 HP is equipped with spring isolators. Shipping
channels are installed beneath each fan assembly and
must be removed. To locate and remove these channels,
refer to
Figure 17, p. 35
and
following procedures:
Spring Isolators
See
Figure 17, p. 35
through
isolator locations.
1. Remove and discard the shipping tie down bolts.
2. Remove the shipping channels and discard.
Notes:
•
Fan assemblies not equipped with rubber or
spring isolators have mounting bolts at the
same locations and must not be removed .
•
If return fan backside spring isolator repair/
replacement is required, access the backside
of the return fan by entering the unit filter
section. Remove the top pivot bearings from
the three fixed- position return damper
blades (bolted together as a single section
with an angle brace). Lift the three-blade
section as a single unit from the return
damper assembly and set aside or lean in
against the return fan frame. Then enter the
return fan compartment from the filter section
to perform service work on the rear isolators.
Figure 19, p.
37, and use the
Figure 19, p. 37
for spring
RT-SVX072D-EN
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