Adjust the boiler aquastats as required. Please note that lowering the setting will not have an immediate effect as the heat stored in the boiler water must first be consumed. Check the boiler water temperature periodically. Further adjustments may be required as the system goes through several space and water heating cycles.
Note: The maximum setting for the boiler outlet temperature is 190°F.
avoid excessive wear and tear on the components due to numerous
4.5DOMESTIC HOT WATER STARTUP
Maximum boiler water temperature is 190°F. This should be 20°F to 40°F above the desired temperature for domestic hot water. In practice, the boiler water temperature should be between 160°F and 180°F.
4.4STARTUP PROCEDURE
1.Fill tank and coil as described in sections 4.1 and 4.2.
2.Adjust temperature levels as described in section 4.3
3.Set domestic thermostat level(s) below room temperature.
4.Activate boiler breakers.
5.The main boiler contact should close and all elements should turn on, along with their pilot lights.
6.The circulator should start up and the 3- way valve should switch to the A side.
7.Boiler temperature should rise.
8.Circulator stops and the
9.Boiler temperature rises and the elements and corresponding pilot lights turn off one after the other as their temperature setting is reached.
10.When all elements are off, increase the setting of the domestic thermostat(s) to a point above room temperature.
11.Circulator should start up following a delay period.
12.Heating elements should turn back on as their temperature setting is reached; this could take a few minutes.
13.Circulator runs as long as a demand exists for heating. When circulator turns off …
14.Boiler temperature rises. Heating elements and corresponding pilot lights should turn off as their temperature setting is reached.
Thus, boiler power requirements depend on heating demand within the building. If only one heating element is required to satisfy the demand, only one is activated ; if two are required, two are activated, etc ... You thus
!DANGER
An excessively high setting can cause scalding. Use the thermostatically controlled mixing valve included with the unit to lower the domestic hot water temperature and thus the risk of injury.
When the boiler water temperature falls below the setting of the domestic hot water priority aquastat, the
When the boiler water temperature reaches the setting of the domestic hot water priority aquastat, the
Considerable time may elapse from a cold start to the moment when the highest set point is reached. Check the domestic hot water temperature as soon as the first heating cycle is complete.
Lowering the set points has no immediate effect. The boiler water heat must first be transferred to the coil. Additional checks will be necessary at the end of successive heating cycles. Further adjustments may be required as time goes by.
The domestic hot water priority aquastat is set at its minimum at shipping time. It can be increased to 190°F for commercial use. Remember that domestic hot water hotter than 125°F can cause scalds. Use this minimum setting as a starting point for any further adjustments. Normally, the domestic hot water priority aquastat is set to 5°F below the lowest heating element aquastat set point.
COMBOMAXMC Electric boiler