48
RT-SVX063E-EN
Gas Furnace Condensate Drain
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
Figure 26,
p. 43
for the location of the drain connection.
N
No
otte
e:: Units equipped with an optional modulating gas
furnace will likely operate in a condensing mode
part of the time.
Ensure that all condensate drain line installations
comply with applicable building and waste disposal
codes.
N
No
otte
e:: Installation on gas heat units will require
addition of heat tape to the condensate drain.
Electric Heat Units
Electric heat units operating on 200/230 volts require
two power supplies as illustrated in
Figure 16, p. 37
.
Unless the unit was ordered with the optional factory
mounted, non-fused disconnect switches, two field-
supplied disconnect switches must be installed. The
power wires for the electric heat are routed into the
electric heat control panel using the through-the-base
access provided in the heating section. Refer to the unit
base layout for dimensional data. For units operating
on 460/575 volts, only one power entry is required.
Use the information provided in the “Power Wire
Sizing & Protection Device Equations,” to determine
the appropriate wire size and Maximum Over current
Protection for the heaters/unit.
N
No
otte
e:: Each power supply must be protected from short
circuit and ground fault conditions. To comply
with NEC, protection devices must be sized
according to the “Maximum Over current
Protection” (MOP) or “Recommended Dual
Element” (RDE) fuse size data on the unit
nameplate.
Provide grounding for the supply power circuit in the
electric heat control box.
Economizer and Relief Air
Damper Adjustment
Relief Air Dampers
Verify that the relief dampers (if equipped) close tightly
when the unit is off.
If relief dampers are not tightly closed with unit off,
take the following steps to preload the dampers:
1. Loosen the relief damper actuator clamp from the
jackshaft
2. From the unit display, command the actuators to
4% open using the Manual mode. This will cause
the actuators to rotate to approximately 5 degrees.
3. Close the dampers by hand and tighten the actuator
onto the jackshaft
4. Command the dampers to 0%. This will cause the
actuators to rotate back to zero degrees, putting
load on the dampers so that they are fully closed at
0% command.
5. Put the relief damper position back into Auto mode.
Outside Air and Return Air Damper
Operation
The outside air and return air damper linkage is
accessible from the economizer section of the unit. The
damper linkage connecting the outside air dampers to
the return air dampers is preset from the factory in the
number 1 position.
W
WA
AR
RN
NIIN
NG
G
N
No
o S
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p S
Su
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acce
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d
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atth
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urry
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D
Do
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ott w
wa
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on
n tth
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ett m
me
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all d
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pa
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n.. W
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allkkiin
ng
g
o
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n tth
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drra
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n p
pa
an
n cco
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an
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n tth
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erra
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ecch
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ng
g..
N
No
otte
e:: Bridging between the unit main supports may
consist of multiple 2 x 12 boards or sheet metal
grating.
Arbitrarily adjusting the outside air dampers to open
fully when the return air dampers are closed or; failing
to maintain the return air pressure drop with the
outside air dampers when the return air dampers are
closed, can cause building pressurization control
problems due to improper CFM being delivered to the
space.
The outside air/return air damper linkage is connected
to a crank arm with a series of holes that allows the
installer or operator to modify the amount of outside
air or return air damper travel in order to balance the
pressure drop between the two air paths.
Adjust the Outside Air Damper Travel
Units with Single Actuators (20 - 55 Ton)
1. Drill a 1/4" hole through the unit casing up stream
of the return air dampers. Use a location that will
produce an accurate reading with the least amount
of turbulence – several locations may be necessary,
then average the reading.
IIn
nsstta
alllla
attiio
on
n
