P-K SOLIS™
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: March 15, 2021
Released: March 15, 2021
Patterson-Kelley 2021
All Rights Reserved.
2701000090 P-K SOLIS NURO Installation and
Owners Manual (Rev A).docx
Page 37
CONDENSATE DRAIN, TRAP & DISPOSAL
All SOLIS boilers produce a significant amount of condensate. The condensate drain is under slightly
positive flue pressure, so the provided 3/4" CPVC condensate trap must always be used. This trap is
sized and designed to fill with the proper amount of condensate to create a liquid barrier to prevent flue
gases escaping through the condensate drain into the installed space.
1. The condensate drain is located at the bottom rear of the appliance near the flue outlet.
Connect the condensate trap assembly to the condensate drain pipe. Additional 1” threaded
CPVC pipe can be added to the condensate drain connection to relocate the condensate trap
assembly as long as all added parts are at a 1° downward slope. After attachment, the trap
must be rotated so the offset in the pipe aims down toward the floor. Do not rotate the offset
toward the ceiling. Do not use tools to tighten the CPVC union. Hand-tighten the CPVC union
to seat the internal gasket.
2. Do not combine condensate drains from multiple condensing appliances into a single drain line.
Route each drain line into a drain suitable for condensate and make certain the end of the drain
line is not submerged or otherwise blocked.
3. All condensate plumbing must be protected from freezing. Do not locate the condensate piping
such that an ice dam of frozen condensate can block condensate from leaving the outlet.
4. The condensate is slightly acidic (3-5 PH), however, local codes may require it to be neutralized
prior to entering the drainage system. An optional, field installed, Condensate Neutralization
System is available from Patterson-Kelley.
5. All piping from the condensate trap to the suitable drain must remain below the highest point
(top of the condensate outlet pipe) on the properly attached condensate assembly.
6. Connection to the condensate trap assembly should be made through either a barbed fitting or
CPVC piping (user supplied). If piping with CPVC, it is recommended that an additional union is
put in to allow for trap cleaning and removal.
Refer to image on the following page for proper installation on the condensate drain.
The trap included with this unit must be installed and maintained as described in these instructions and
must be included as part of the condensate piping system. This trap is required to keep potentially
hazardous products of combustion from continually entering the installed space where the condensate
piping terminates. Failure to properly install this trap can cause, personal injury, exposure to hazardous
materials or death.
Condensate Trap must be piped to drain in accordance with all national, state and local codes. If
installed outdoors, it must be field heat traced.
