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L7224 ELECTRONIC AQUASTAT
I have a l7224 honeywell electronic aquastat controlling a oil furnace. There is one circulator for 2 zones, 1st zone for heating and second zone for heating a indirect hot water tank for domestic hot water.Each zone has its own hydronic zone valve. 1st zone valve is controlled by a wall thermostat on the main floor. The 2nd zone valve is controlled by the thermostat in the indirect boiler,the contacts on the zone valves are paralled and go to terminals tt on the aquastat.The burner is on B1 B2 of the aquastat and the circulator pump is on C1 C2.When either zone calls for heat the burner starts and brings the water up to the high limit set at 170. The burner then shuts down and restarts at 160 because the high diff is set at 10. The problem I'm having is that the c1 c2 terminals never put out 120vac to start the circulator. However the cast iron rads get hot because of convection and eventually warms the house. This is the way it was when I moved in and just noticed that the circulator never runs on a call for heat from either zone. I read the manual and I am confused on the low limit setting for this system I want a cold start system so what should the low limit setting be on in order to get the circulator to start on a call for heat or DHW.If the low limit is turned off will the c1 c2 terminals ever start the circulator.
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