Heat Link 31360, Manual

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HeatLink
®
Mixing Valve Reset Control Stk# 31360
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Boiler Operation (North American Version)
North American Version
Boiler Operation
Boiler Return Sensor
The boiler return sensor, if used, should be located on the boiler return and enables the boiler to operate at the
operating aquastat setting as described in the BOILER ENABLE section.
Boiler return
sensor
No Boiler Sensor
The 31360 is capable of operating without a boiler return sensor if desired. Without a boiler return sensor, the 31360
provides a boiler enable as described in the BOILER ENABLE section, but is unable to provide boiler protection.
This type of application is typical if the 31360 is drawing heat from a heat source that already incorporates some
form of boiler protection.
No boiler
sensor
Boiler Enable
The Boiler Enable contact allows the boiler to ignite and operate at the boiler's operator setting.
The control closes the Boiler Enable contact when the position of the mixing valve exceeds 30%. The Boiler Enable contact remains closed until
the position of the mixing valve reduces below 15%.
In order to prevent short cycling, the Boiler Enable contact has a minimum on time, and a minimum off time.
Boiler Minimum (BOIL MIN)
Most boilers require a minimum water temperature in order to prevent flue gas condensation. Check the boiler data brochure's minimum recommended
operating temperature and set the BOIL MIN. Only when a boiler return sensor measures the boiler temperature can the control provide boiler
protection. In this case, when the boiler is firing and the boiler return temperature is below the Boil Min setting, the control turns on the MIN
segment and reduces the heating load on the boiler by limiting the output of the mixing valve. If the installed boiler is designed for low temperature
operation, set the BOIL MIN adjustment to OFF.