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Steam boiler pressuretrol differential dial setting
I have a Weil McLain EG steam boiler 1 pipe system located in the basement The house is single family, 40' long and 20' wide and has 2 floors in addition to the basement. The first floor has 1 radiator in the back kitchen/dining room approximately 30' from the boiler and 1 in the front living room about 10' from the boiler. The 2nd floor has 1 radiator in the master bedroom above the living room, 1 radiator in the bathroom directly above the boiler, 1 radiator in the bedroom directly above the dining room and 1 small radiator in the smallest bedroom adjacent to the previous bedroom.
I have the Honeywell pressuretrol cut in set to .5 psi(the screw is turned as far as can go) and the differential dial indicator at just about halfway between the numbers 1 and 2. ( Halfway between the 1 and 2 and lined up with the black line above it).
The issue that I'm having is when I turn the thermostat up 1 degree from the set temperature or when the first run of the morning (2-3 degree increase) occurs the boiler will run for approximately 30-35 mins and shut off for 4-5 mins even though the thermostat is not satisfied. After 4-5 mins it will fire up again and run for either the minimum run time I have the thermostat set to which is 5 mins or it will run until the thermostat is satisfied usually 10-15 more mins). All of the radiators are heating and heating pretty well balanced.
I don't understand why the boiler shuts off after only 30-35 mins and I'm wondering if I should increase the differential to closer to 2? I know articles have suggested to set the differential dial to 1 but I'm assuming this will further shorten my boiler cycle run time from where it is now so I haven't done this. Isn't the boiler supposed to run non stop as long as required to satisfy the thermostat unless the pressure reaches the cut out? Or should the boiler shut off and restart more than one time a heating cycle by having the pressuretrol differential set closer to 1 to have the cut out lower and allow the boiler to shut off prior to the thermostat being satisfied then restart a few minutes later until the thermostat is satisfied or again the pressure builds to the cutoff?
When the thermostat is at it's set point throughout the day it will turn on every hour and a half or so(depending on how cold it is outside but example in mid 30s) and within 4-6 mins the steam has hit the end of the runs on both sides of the house evenly so it's operating efficiently from the last stand point.
The house has all new windows, new doors new insulation and has very little draft so when the thermostat is satisfied even when it's 30 degrees outside the inside heat retains for more than an hour and a half.
Does this seem like any issue or something I should try and tweek?
Additionally, the only other odd thing is the smallest radiator which is furthest from the boiler gets hot at the bottom opposite end of the valve before the top and side where the steam enters the radiator. I have a D vent in this one. Has anyone seen this radiator issue before?
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