29
A. CONTROL OVERVIEW
The PUREFIRE boiler control is one of the primary safety
devices for the boiler. It controls the ignition sequence,
temperature limits, circulators and gas flow to the boiler. It
also provides many unique features.
The control provides 7 central heating modes and 3
domestic hot water modes. In addition, the boiler can be
adapted to several different piping schemes using the 4
different pump modes.
To provide maximum flexibility, several special features
are also included.
1. Central Heating (CH) Modes:
The P
UREFIRE boiler control allows the installer to
choose from several different central heating modes.
The following table shows the central heating modes.
In addition, the table shows the display text associated
with each CH mode and a brief description of the
operation.
2. Domestic Hot Water (DHW) Modes:
The P
UREFIRE boiler control also allows the installer to
choose from three different DHW modes.
BOILER CONTROL: INTERNAL WIRING & OPERATION
CH
Mode
Display Text Brief Description
Detail
Section
Page
0 Indoor Thermostat
Call-for-Heat signal from thermostat with user selected boiler supply
target setpoint temperature.
8.D.1 36
1 Thermostat and Outdoor Reset
Call-for-Heat signal from thermostat with boiler supply target
temperature calculated using outdoor temperature.
8.D.1 36
2 Full Outdoor Reset
Continuous heat demand with boiler supply target temperature
calculated using outdoor temperature.
8.D.1 36
3 Permanent Demand
Continuous heat demand with user selected boiler supply target
temperature.
8.D.1 36
4 0-10 V Input to modulate Setpoint This mode is not available at this time. 8.D.1 N/A
5 0-10 V Input to modulate Rate This mode is not available at this time. 8.D.1 N/A
6 Hydro-Air Unit
Call-for-Heat signal from a thermostat with user selected boiler supply
target setpoint temperature optimized for hydro-air heating systems.
8.D.1 36
Table 8.1: Central Heating Modes
DHW
Mode
Display Text Brief Description
Detail
Section
Page
0 No DHW No domestic hot water tank is used. 8.E.1 38
1 DHW store with sensor
The domestic hot water tank is equipped with a temperature sensor.
The PUREFIRE control modulates the boiler firing rate based on tank
temperature.
8.E.1 38
2 DHW store with thermostat
The domestic hot water tank is equipped with a thermostat. The
P
UREFIRE control responds to the demand from the thermostat and
modulates the boiler firing rate targeting the DHW boiler setpoint.
8.E.1 38
Table 8.2: Domestic Hot Water (DHW) Modes
8. BOILER CONTROL: INTERNAL
WIRING & OPERATION
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