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Requirements for Hot Water Heat (WLHE)
•
Route properly sized water piping through the base of
the unit into the heating section.
•
Install the factory-supplied, 3-way modulating valve.
•
Complete the valve actuator wiring.
Requirements for Steam Heat (WSHE)
•
Install an automatic air vent at the top of the return
water coil header.
•
Route properly sized steam piping through the base of
the unit into the heating section.
•
Install the factory-supplied, 2-way modulating valve
•
Complete the valve actuator wiring.
•
Install 1/2", 15-degree swing-check vacuum breaker(s)
at the top of each coil section. Vent breaker(s) to the
atmosphere or merge with return main at discharge
side of steam trap.
•
Position the steam trap discharge at least 12" below the
outlet connection on the coil.
•
Use float and thermostatic traps in the system, as
required by the application.
O/A Pressure Sensor and Tubing
Installation
(All units with Statitrac)
•
O/A pressure sensor mounted to the roof bracket.
•
Factory supplied pneumatic tubing installed between
the O/A pressure sensor and the connector on the
vertical support.
•
Field supplied pneumatic tubing connected to the
proper fitting on the space pressure transducer located
Figure 12. Condensate trap installation
RT-SVX35H-EN
in the filter section, and the other end routed to a
suitable sensing location within the controlled space.
Condensate Drain Connection
Each casing 2 through 6 unit is equipped with a 1"
evaporator condensate drain connection (1.25" on Casing
9) on each side of the unit. Due to the size of the these units,
a condensate drain line must be connected to both
evaporator drain connections. Refer to
Figure 8, p. 23
for the location of the 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 12, p.
31.
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".
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
p. 19
-
Figure 8, p. 23
for the location of the drain
connection.
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.
Installation
Figure 4, p. 19
-
Figure 4,
31
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