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Unit Replacement
Main Electrical Power
Lock and tag out unit main electric power and remove
power supply wiring from installed disconnect/terminal
block of unit. See for locations.
Note: Inspect wiring to ensure that all field-installed wiring
complies with NEC and applicable local codes.
SEHF Units with 200V or 230V Electric
Heat
(Requires separate power supply to heater)
Lock and tag out unit main electric power and remove
power supply wiring for the electric heat from a dedicated,
field- supplied/installed disconnect to terminal block, or to
an optional unit-mounted disconnect switch. See for
locations.
Field-installed Control Wiring
Note: Inspect wiring to ensure that all field-installed wiring
complies with NEC and applicable local codes.
Remove the field wiring connections for the variable air
volume controls as applicable.
Note: Label wiring to save time when reconnecting wiring is
necessary.
Remove ground wire from the unit.
Note: The electrical connection for 40, 60, 70 and 75 ton is
32 inches further down the unit than older (pre-
2010) style units. On full perimeter curbs, this also
means the incoming electrical will be outside the
curb area. The electrician should be informed of
both points.
See for typical field wiring for 20-75 ton units. See
35, p. 51
for typical field power wiring for 90-130 ton units.
Requirements for Gas Heat
WARNING
Hazardous Gases and Flammable
Vapors!
Failure to observe the following instructions could
result in exposure to hazardous gases, fuel
substances, or substances from incomplete
combustion, which could result in death or serious
injury. The state of California has determined that
these substances may cause cancer, birth defects, or
other reproductive harm.
Improper installation, adjustment, alteration, service
or use of this product could cause flammable
mixtures or lead to excessive carbon monoxide. To
avoid hazardous gases and flammable vapors follow
proper installation and setup of this product and all
warnings as provided in this manual.
1. Remove and isolate gas supply from the unit gas train.
2. Ensure gas supply line piping joints are properly
sealed.
62
3. Remove drip leg Installed in the gas piping near the
unit.
4. Remove factory-supplied flue assembly installed on the
unit.
5. Remove the 3/4" CPVC furnace drain stub out that was
used for condensate drain.
Requirements for Hot Water Heat (SLH*)
1. Remove and isolate water piping that comes into the
heating section from the base of the unit.
2. Remove the installed, 3-way modulating valve, if
necessary, to remove unit.
3. Remove the valve actuator wiring.
Requirements for Steam Heat (SSH*)
1. Remove and isolate steam piping that comes into the
heating section from the base of the unit.
2. Remove, 2-way modulating valve if necessary.
3. Remove the valve actuator wiring.
Space Pressure Sensor and Tubing
Installation
(All units with Statitrac)
Remove field-supplied pneumatic tubing connected to the
space pressure transducer located in the filter section (see
Figure 36, p.
Figure 36. Duct static pressure control layout
Figure
OUTSIDE AIR REFERENCE
TUBE CONNECTS HERE
TRAQ TRANSDUCER
& SOLENOID ASSEMBLY
DUCT STATIC
TRANSDUCER ASSEMBLY
62).
SPACE PRESSURE TRANSDUCER
& SOLENOID ASSEMBLY
RETURN AIR TRANSDUCER
& SOLENOID ASSEMBLY
RT-SVX072D-EN
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