I have a white-rodgers 1e30w609 .1 a 750mv thermostat to control my crane 20 natural gas boiler. However, there are 3 Honeywell controller fastnened to the water pipes. I was told that 1 controls the high temp (set at 170F), 1 controls the low temp (set at 140F) and 1 controls the water pump (set at 100F). Am I using the correct thermostat for this application since it appears that the boiler turns one and off irrespective of setting of thermostat.