RT-SVX36G-EN 49
Installation
Requirements for Electric Heat Units
All SEHL Units (380 minimum voltage).
• 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.
SEHL Units w/200V or 230V Electric Heat: (Requires Separate Power Supply to
Heater)
• Connect properly sized and protected power supply wiring for the electric heat from a
dedicated, field- supplied/installed disconnect to terminal block 4TB2, or to an optional unit
mounted disconnect switch 4S15.
Requirements 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.
• Flue Tubes 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.
Requirements for Hot Water Heat (SLH_)
• 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 (SSH_)
• 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 or Return Fans)
• 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 (Statitrac only).
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