TECHNICAL
How to:
Cold Air Trap
Construction Filter
Thermal Siphon heat exchanger
Wiring:
TACO Switching Relays
Retrofitting the Riello to an older FCX
Rewire Heat Wise Burner for post-purge
Install a hour meter
Becket Wiring Changes
TACO 502,3,4... Control with Johnson 421 Digital Temperature Control
TACO 502,3,4... Wiring Detail for Actuators and Thermostats
Tekmar 402 Wiring Details - Zone Valves
Tekmar 402 Wiring Details - Cross Manifold
Probe Locations - Tekmar 402, Johnson 419, Delta T Pumps
Fundamentals:
Hot Water Safety Shutdown - Causes and solutions
VRG130 - Mixing Valve Alignment
Handling the Condensate - Piping and Traps
Best Practices
This PDF contains basic installation recommendations on Fuel, Pumping, Piping, Controls, Stacks. Setup and Tuning. Also included are:
A basic plumbing diagram for a simple radiant and DHW system, with a typical parts list.
A detailed wiring diagram using a Taco SR502 using the Johnson 419 heat controller is included.
A DWH diagram showing the domestic side of the BS series indirect water heaters.
A detailed wiring diagram showing how to interface the FCX with the Tekmar 400 series of controllers including modifications to the FCX wiring.
A symbol KeyPlumbing Schematics:
Rule #1: Return water temperatures control efficiency (the lower the return water temperature the more condensing). The colder the better, so certain practices should generally be avoided: no 4-way mixing valves or blocks, no circulating injection loops, and no hydraulic separators. Tempering of return water by any means is to be avoided. In most residential and small commercial systems these are rarely necessary even when multiple pumped circuits are used. If there are reasons to incorporate injection based or hydraulically separated systems, there are ways to accomplish this but will require additional plumbing.
The following examples detail some of the options of how to interface the low temperature (mixed circuit) with the high temperature circuit. Again, "be cool" with the return water.
Radiant + DHW (basic)
Baseboard - Alone
Baseboard + Unit Heater + DHW
Radiant, baseboard, with 2 mixing valves + DHW (Optimized)
Domestic Plumbing Option for BS Tanks