4. Special Features:
The P
UREFIRE
®
control offers several special features to
give the installer options in setting up the boiler. These
options are shown in the following table.
39
BOILER CONTROL: INTERNAL WIRING & OPERATION
Table 8.4: Control Features
Feature Brief Description
Detail
Section
Page
System Response
Time*
Allows the installer to adjust the response time of the burner modulating control.
Cascade* Multiple boilers operate together in order to satisfy the heating or DHW demand.
8.J 48
One Hour Retry*
One hour after a lockout on ignition or flame failure, the PUREFIRE
®
control will reinitiate boiler
operation.
10.B.4 57
Restore System
Defaults*
Allows the installer to reset all parameters to the factory defaults if desired. The installer can also
save and restore site defaults.
8.K 53
Adjustable Blower
Postpurge*
This feature allows the installer to increase the blower postpurge to counteract the effects of high
winds or unusual wind currents.
8.C.4 42
Flame Signal Log*
This troubleshooting tool captures the flame signal at four increments during the two second flame
proving period. This can help installers/service personnel to quickly diagnose problems with flame
rectifications.
10.B.5 57
Freeze Protection
Activates pumps if temperatures fall below the specified value. If the temperatures continue to fall,
the boiler is activated.
8.C.3 42
DHW Tank Warm
Hold
Prevents boiler from ramping up to high power if the DHW demand is only to keep the tank
warm.
8.E.3 46
Ramp Delay Step
Modulation
This feature is used to prevent short cycling in systems using very small zones. The input rate is
gradually increased from 20% to 100% over 2 minutes. When used, this only effects central
heating operation.
8.D.4 44
Add’l Safety
Functions
Allows the installer to choose between a low water cutoff and a flow switch for water level safety
shutdown.
8.C.5 42
Vent Temperature
Safety Limit
Reduces the firing rate if the vent temperature approaches the maximum limit of the vent material.
If the vent temperature continues to climb, the PUREFIRE
®
control will shut down the boiler.
8.C.2 42
Outdoor Reset
The PUREFIRE
®
control changes the boiler supply target temperature to compensate for changes in
load due to milder outdoor temperatures. This increases the efficiency of the boiler and is more
comfortable.
8.D.3 43
System Type
Presets*
By choosing the heat distribution type (finned tube baseboard, hydro air, cast iron radiators, cast
iron baseboard, low mass radiant or high mass radiant) the installer can automatically select
practical boiler design and mild weather temperatures.
8.D.3 43
Temperature Boost
The temperature boost function increases the boiler supply target to recover more quickly from
setback conditions.
8.D.3 44
Warm Weather
Shutdown
The PUREFIRE
®
control will shut down the boilers CH functions if the outdoor temperature is above
an installer defined maximum. This prevents the boiler from running during warm weather.
8.D.3 44
Anti-Cycling
The anti-cycling function prevents rapid on/off cycling of the boiler. This includes an override
function to be sure that all loads are satisfied.
8.D.4 44
Limited DHW
Priority
The PUREFIRE
®
control provides DHW priority for boiler operation. However, the control will
automatically switch between CH and DHW loads after an installer determined switch time.
8.E.2 46
DHW Heat Dump
If enabled, the DHW heat dump function serves to dump heat from the boiler system to the DHW
tank after a CH demand has ended.
8.E.4 46
Service Notification
If enabled, the PUREFIRE
®
control will display a service notification after an installer defined number
of hours or cycles. It can also display a notification based on a date of the installers choosing.
8.F 46
System Test
The PUREFIRE
®
boiler will allow the installer to operate the boiler at low power, high power and
ignition input for troubleshooting purposes.
8.G 47
Fault History
The PUREFIRE
®
control allows service personnel to access the last 15 Blocking Errors and the last
15 Lockout Errors in addition to records of the interval between Errors.
8.H.3 47
*New feature
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