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Two Circs - TT Prestige Excellence
Hello everyone! My contractor friend John and I just finished tearing out my old Weil-McClain that has served my home well for about 60 years and installed a new Triangle Tube Prestige Excellence.
The boiler is in place and running (primarily for DHW now) but I have a few questions about the circulator pump relays using the built-in Prestige controller. The boiler clearly states and supports two CH zones and there are two 24V connections marked CH1 & CH2. We were also under the impression that the boiler supported two zone pumps but now I am not sure.
There is a primary pump factory installed in the boiler that is used for the primary CH loop and DHW heat exchanger (using a three-way valve). This pump is wired to the auxiliary boiler pump terminals. The three-way valve has the line and neutral wired to the DHW pump/diverter valve terminals and another line wired to the CH1 pump diverter valve terminals.
We wired the #2 zone pump to the CH2/system pump terminals and wired the #1 zone pump to the CH1 pump diverter valve terminals (with the line from both the diverter valve and #1 zone pump sharing a terminal. I figured this must be correct because when one of the zone pumps is running, the three-way valve would always be active in CH mode.
The DHW function is working perfectly but when there is a call for heat (from either zone), only pump #2 and the boiler pump run. This would be correct if Zone #2 were asking for heat but the #2 pump runs, even when only Zone #1 is calling for heat. I have tried all three settings on the boiler's CH1/CH2/DHW, CH1/CH2, & CH2 menu but none will run zone pump #1.
Are we doing something wrong with this control panel or do I need an additional controller to support two zone pumps?
Thanks in advance for the help.