Rheem Combi and Taco Control Module

RheemNewbie

Hoping to find some help on wiring this Rheem Combi boiler correctly. I have been reading the manual time and time again and I don't feel confident enough to continue.

Boiler : Rheem RCBH-L199i

Taco Control Module : SR503 - 3 Zone Pump Control

The Taco pump control says to wire as a tankless I need to run wires to the ZC and ZR. Does the Combi boiler have a ZC and ZR? I can't find anything labeled as such.

Or, when using a Rheem Combi, do I wire it as a cold start from the Taco pump control and run the isolated end switches over to the units 13x 3&4?

Thank you in advanced. Very much appreciated.

hot_rod

it depends a bit on how you piped it. Does it have a primary loop?

You can run Combis two different ways. Cold start, or maintain a temperature, which speeds up the dhw by 30 seconds or more. But it will use more fuel in the stay warm mode.

The zones would wire the same regardless of which DHW mode you use. They too will get hot water instantly in the stay warm mode.

Thermostats wire to zone module. TT connections go to boiler heat call contacts.

T stat starts circulators, zone relay box tell boiler to fire.

kcopp

Its a gas combi not an oil fired boiler.

The boiler will take care of its needs for hot water.

Just run the end switch from the control to the space heating contacts inside the boiler.