Installation
RT-SVX24J-EN 63
Rigging the Unit
[ ] Set the unit onto the curb; check for levelness.
[ ] Ensure unit-to-curb seal is tight and without buckles
or cracks.
[ ] Install and connect condensate drain lines to each
evaporator drain connection.
[ ] Remove the shipping hardware from each
compressor assembly.
[ ] Remove the shipping hold-down bolts and shipping
channels from the supply and exhaust fans with spring
isolators.
[ ] Check all supply and exhaust fan spring isolators for
proper adjustment.
[ ]Verify that all plastic coverings are removed from the
compressors.
[ ] Verify all discharge and liquid line service valves
(one per circuit) are back seated.
Main Electrical Power Requirements
[ ] Verify that the power supply complies with the unit
nameplate specifications.
[ ] Inspect all control panel components; tighten any
loose connections.
[ ] Connect properly sized and protected power supply
wiring to a field-supplied/installed disconnect and unit
[ ] Properly ground the unit.
All field-installed wiring must comply with NEC and
applicable local codes.
Field Installed Control Wiring
[ ] Complete the field wiring connections for the
constant volume controls as applicable. Refer to“Field
Installed Control Wiring” for guidelines.
[ ] Complete the field wiring connections for the
variable air volume controls as applicable. Refer to
“Field Installed Control Wiring” for guidelines.
Note: All field-installed wiring must comply with NEC
and applicable local codes.
Requirements for Electric Heat Units
[ ] Verify that the power supply complies with the
electric heater specifications on the unit and heater
nameplate.
[ ] Inspect the heater junction box and control panel;
tighten any loose connections.
[ ] Check electric heat circuits for continuity.
Requirement 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 inches
w.c. to prevent component failure.
[ ] Main supply gas pressure adequate.
[ ] FlueTubes clear of any obstructions.
[ ] Factory-supplied flue assembly installed on the unit.
[ ] Connect the 3/4" CPVC furnace drain stubout to a
proper condensate drain. Provide heat tape or
insulation for condensate drain as needed.
Requirements for Hot Water Heat
[ ] 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
[ ] 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 VAV units and all units with Statitrac)
Figure 44, p. 66
• 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
in the filter section, and the other end routed to a
suitable sensing location within the controlled space.
Condensate Drain Connections
Each unit provides two 1-1/4" evaporator drain
connections on each side of the unit.
Due to the size of these units, all condensate drain
connections must be connected to the evaporator drain
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