PureFire Installation, Operation, and Maintenance Manual

PB HEAT, LLC
131 S. CHURCH STREET • BALLY, PA 19503
PF8205 R0 (9/12-1.5M)
©2012 PB Heat, LLC. All rights reserved. Printed in U.S.A.
CH Mode 7, Internal Reset Operation:
2. This is the new default Central Heating (CH) mode for PUREFIRE
®
boilers which is designed to work
comfortably and effi ciently without an outdoor sensor or any adjustments to the Installer Menu.
3. In CH Mode 7, the control calculates the target boiler water temperature based on the frequency and duration
of calls for central heat (CH) at the thermostat input of the boiler.
• As the calls for central heat get longer and more frequent, which indicates a larger heating load, the boiler
temperature will be higher.
• As the central heating calls get shorter and less frequent, the boiler temperature will be lower.
4. The rate of temperature change can be adjusted to enhance the effi ciency and comfort level:
• The graph above shows how the temperature target increases and decreases over time depending
whether or not there is a call for heat.
• The following table shows the range and default values for increment and decrement.
Using a larger number for the temperature increase makes the boiler target a higher temperature faster.
Using a larger number for the temperature decrease makes the boiler target a lower temperature faster.
5. The target boiler water temperature will not increase beyond the Boiler Design Temperature or decrease
below the Mild Weather Boiler Temperature.
• Both values are defi ned in the installation instructions in section 8.D.3.
• The default value of the Mild Weather Boiler Temperature has been changed.
CH
Call
CH
Call
Minimum Default Maximum
Increment (Temperature Increase)
Installer Menu – CH Settings – Screen #15
0.9°F 1.8°F 36.0°F
Decrement (Temperature Decrease)
Installer Menu – CH Settings – Screen #14
0.9°F 0.9°F 36.0°F
Minimum Default Maximum
Boiler Design Temperature
Installer Menu – CH Settings – Screen #7
60°F 180°F 195°F
Mild Weather Boiler Temperature Installer
Menu – CH Settings – Screen #8
35°F 120°F 160°F