62 RT-SVX36G-EN
Installation
Hot Water Heat Units (SLH_)
Hot water heating coils are factory installed inside the heater section of the unit. Once the unit is
set into place, the hot water piping and the factory provided three way modulating valve must be
installed. The valve can be installed inside the heat section or near the unit. If the valve is installed
in a remote location, use field supplied wiring to extend the control wires from the heater section
to the valve. Two access holes are provided in the unit base as illustrated in Figure 10, p. 36.
Following the guidelines listed below will enhance both the installation and operation of the “wet
heat” system.
Figure 29 and Figure 31 illustrate the recommended piping configuration for the hot water coil.
Ta b le 2 0 lists the coil connection sizes.
Note: The valve actuators are not waterproof. Failure to protect the valve from moisture may
result in the loss of heating control.
1. Support all field-installed piping independently from the heating coil.
2. Use swing joints or flexible connectors adjacent to the heating coil. (These devices will absorb
the strains of expansion and contraction).
3. All return lines and fittings must be equal to the diameter of the “outlet” connection on the hot
water coil.
4. Install a “Gate” type valve in the supply branch line as close as possible to the hot water main
and upstream of any other device or takeoff.
5. Install a “Gate” type valve in the return branch line as close as possible to the return main and
down stream of any other device.
6. Install a strainer in the hot water supply branch as shown in Figure 29 and Figure 38.
Figure 28. Flue Assembly
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