Maximum CH Input Limit: The PUREFIRE
®
control
allows the installer to limit the maximum input of the
boiler under a CH load if desired. This can be used
when the boiler is sized primarily for a DHW load and
is oversized for the CH load. This can be set between
50% and 100% and the default is 100%.
CH Response Time
: This feature allows the installer to
adjust the response time of the boiler. The “I” value is
adjustable from 15 to 100 with 15 providing the
fastest response. The default value is 60. If the boiler
achieves its target very quickly with limited
modulation, increase the “I” value to reduce the
response time. If the boiler modulates very slowly to
its target and has problems keeping up with the load,
reduce the “I” value to increase the response time.
E. DOMESTIC HOT WATER (DHW)
1. DHW Modes:
Table 8.2 provides an overview of the domestic hot
water modes. The following are detailed descriptions
of the operation of these modes:
Mode 0 – No DHW
: When this mode is selected, the
control will not respond to either a thermistor signal or
a contact closure at the DHW terminals (#5 & #6).
There is also no output to DHW Pump Terminals.
Mode 1 – DHW Store with Sensor
: In this mode, the
P
UREFIRE
®
control accepts a temperature input from an
optional domestic tank sensor (54157). This sensor
provides the DHW water temperature value to the
control. The control targets the user selected DHW
setpoint and modulates the boiler firing rate accordingly.
Mode 2 – DHW Store with Thermostat
: This is the
default mode for the control. In this mode, the
P
UREFIRE
®
control is connected to the DHW tank
temperature limit. When the limit closes, the control
modulates the boiler firing rate to target a boiler
supply setpoint. This setpoint is a user selected value
with a factory default of 180 °F. The allowable range
for this value is 134°F to 189°F.
46
Table 8.9: Outdoor Design Temperature (ODT) – U.S. Cities
City State ODT City State ODT City State ODT
Mobile AL 29°F -2°C Springfield IL 2°F -17°C Albuquerque NM 16°F -9°C
Anchorage AK -18°F -28°C Indianapolis IN 2°F -17°C New York City NY 15°F -9°C
Juneau AK 1°F -17°C Des Moines IA -5°F -21°C Rochester NY 5°F -15°C
Flagstaff AZ 4°F -16°C Wichita KS 7°F -14°C Greensboro NC 18°F -8°C
Tucson AZ 32°F 0°C Bowling Green KY 10°F -12°C Fargo ND -18°F -28°C
Little Rock AR 20°F -7°C New Orleans LA 33°F 1°C Columbus OH 5°F -15°C
Fayetteville AR 12°F -11°C Bangor ME -6°F -21°C Tuls a OK 13°F -11°C
Sacramento CA 32°F 0°C Portland ME -1°F -18°C Portland OR 24°F -4°C
San Diego CA 44°F 7°C Baltimore MD 13°F -11°C Philadelphia PA 14°F -10°C
San Francisco CA 38°F 3°C Boston MA 9°F -13°C Pittsburgh PA 5°F -15°C
Boulder CO 8°F -13°C Springfield MA 0°F -18°C Charleston SC 28°F -2°C
Denver CO 1°F -17°C Detroit MI 6°F -14°C Sioux Falls SD -11°F -24°C
Hartford CT 7°F -14°C Marquette MI -8°F -22°C Dallas TX 22°F -6°C
Waterbury CT 2°F -17°C Minneapolis MN -12°F -24°C Salt Lake City UT 8°F -13°C
Wilmington DE 14°F -10°C Jackson MS 25°F -4°C Burlington VT -7°F -22°C
Orlando FL 38°F 3°C St. Louis MO 6°F -14°C Richmond VA 17°F -8°C
Tallahassee FL 30°F -1°C Billings MT -10°F -23°C Seattle WA 27°F -3°C
Atlanta GA 22°F -6°C Omaha NE -4°F -20°C Spokane WA 2°F -17°C
Boise ID 10°F -12°C Carson City NV 9°F -13°C Morgantown WV 8°F -13°C
Idaho Falls ID -6°F -21°C Manchester NH -3°F -19°C Green Bay WI -9°F -23°C
Chicago IL -4°F -20°C Atlantic City NJ 13°F -11°C Cheyene WY -1°F -18°C
DANGER
Water temperatures over 125°F can instantly cause
severe burns or death from scalding. Children, elderly
and disabled individuals are at the highest risk of
scalding. See instruction manual for the indirect tank
before setting the water heater temperature. Instruct
users to feel the water temperature before bathing or
showering. Anti-scald valves are recommended.
Be sure to use only the tank sensor indicated. Other
sensors will not provide accurate tank temperatures
and may cause severe personal injury due to scalding.
WARNING
BOILER CONTROL: INTERNAL WIRING & OPERATION
The “Store Warm Hold” function will not be functional
if the DHW tank mode is set to 2. This requires a
DHW tank sensor.
NOTICE
Before selecting Mode 1, connect the DHW sensor to
terminals #5 & #6. Failure to do this will result in a
blinking screen warning as covered in Section 10.D.
NOTICE
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