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L7224A,C; L7248A,C,L OIL AND ELECTRIC BOILER
Thermal Purge and Domestic Hot
Water
The thermal purge feature is automatically disabled
whenever there is a call for domestic hot water either
from the Zr terminal or from the DHW Module to
insure hot water is available in a timely manner. See
"ZR-Domestic Hot Water (DHW) Request" on page 7.
Pump Cycling
The Pump Cycling feature exercises the system pump
for 15 seconds after a non-adjustable five day period
of no boiler activity. The Pump Cycling feature default
setting is enabled (ON) but can be disabled (OFF)
using the 3-digit display. See "Adjusting Settings" on
page 5.
Fig. 8. L7224A,C; L7248L single heat zone with indirect water tank and circulators. Optional Outdoor Reset
68-0281—18
L1
W8735Y1000 OR
(HOT)
W8735S1000
L1
(HOT)
1 2 3 OT OT
1
C7089U
OUTDOOR
SENSOR
SENSOR
ZR
L1
LINE
L2
VOLTAGE
CIRCULATOR
C2
B2
C1
LINE
VOLTAGE
B1
OIL BURNER
RELAY
ZC
1
OUTDOOR RESET MODULE IS OPTIONAL. W8735S1000 WIRED OUTDOOR
RESET MODULE SHOWN.
2
FOR BEST PERFORMANCE SET DUU="ON".
CHECKOUT
Put the system into operation and observe at least one
complete cycle to make sure that the controller
operates properly. See TROUBLESHOOTING section
to use LED to assist in determining system operation.
TROUBLESHOOTING
When attempting to diagnose system performance,
reference to the LED display can help to identify
specific areas not working properly. The LED display
will scroll Err, followed by a digit (1-8). Refer to Table
10 and 11 for a description of each error and
suggested actions.
LINE VOLTAGE INDIRECT
TANK AQUASTAT
INDIRECT
TANK
L2
CIRCULATOR
L2
T
T 3
2
1
Module.
8
2
M32023A
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