User Guide

39
103876-08 - 1/19
CL
Installation & Service Manual
A. WATER BOILERS SEQUENCE OF OPERATION
1. Water Boilers Without Tankless Heaters
(Cold Start), Sequence Of Operation:
a. The CL Boiler is equipped with an Intelligent
Oil Boiler Control (Cold Start Boiler Control).
The boiler control replaces the traditional
electronic aquastat and circulator relays
and adds energy saving thermal purge
features. Energy is saved by starting the
circulator and delaying the burner start
when there is residual heat available in the
boiler.
b. The boiler’s sequence of operation is shown
as Status Codes on Boiler Control display.
See Table 7 and Figure 30.
c. When the thermostat calls for heat the
boiler control starts the system circulator
and the thermal purge (circulator pre-purge
time) begins. If the time is completed or
boiler temperature is less than the Start
Temperature (140 F default) the start
sequence continues by energizing the oil
primary to operate the following sequence:
blower is started and operates for pre-
purge time; spark is energized and fuel
valve is opened for ignition trial time; burner
fires until the thermostat is satisfied.
d. If the thermostat is not satisfied and the
Operating Setpoint (SP) is reached the
system circulator will continue to operate
and the burner will stop. When the boiler
water temperature drops below the setpoint
less the differential setting the burner will
restart.
e. After the thermostat is satisfied the burner
and circulator are stopped.
f. When an indirect water heater aquastat call
for heat is wired to the “ZR” terminal the
Boiler Control starts a domestic hot water
circulator connected to the “ZC” terminal
and when the boiler temperature is less than
Operating Setpoint (SP), the boiler control
energizes the oil primary to turn on the
burner without circulator pre-purge delay.
g. On burner start, if the CAD cell does not
see flame within approximately 15 seconds,
primary control will shut down the burner
and enter into a lockout mode. A lockout is
reset by pressing the reset button located
on the primary control. If the flame is lost
while the burner is firing, the primary control
shuts down the burner, enters a 60 second
recycle delay, and repeats the ignition
sequence. If after three (3) trials for ignition,
flame is not detected, primary control will
enter into restricted mode. Restricted mode
is reset by holding down the reset button for
15 seconds.
2. Water Boilers with Tankless Heaters (Warm
Start), Sequence Of Operation:
a. The CL Boiler is equipped with a Warm
Start Intelligent Oil Boiler Control (Warm
Start Boiler Control). The Warm Start Boiler
Control replaces the traditional high and low
limit aquastat and circulator relays.
b. The boiler’s sequence of operation is shown
as Status Codes on Boiler Control display.
See Table 7 and Figure 30.
c. When the thermostat calls for heat the boiler
control starts the system circulator and the
start sequence continues by energizing
the oil primary to operate the following
sequence: blower is started and operates
for pre-purge time; spark is energized and
fuel valve is opened for ignition trial time;
burner fires until the thermostat is satisfied.
Optionally, the thermal purge (circulator
pre-purge time) maybe added adjusting
the Circulator Pre-purge time parameter.
This feature saves energy by starting the
circulator and delaying the burner start
when there is residual heat available in the
boiler .
d. If the thermostat is not satisfied and the
Operating Setpoint (SP) is reached the
system circulator will continue to operate
and the burner will stop. When the boiler
water temperature drops below the setpoint
less the differential setting the burner will
restart.
e. After the thermostat is satisfied the burner
and circulator are stopped.
f. The Warm Start Boiler Control also includes
a low limit control function. When the
boiler water temperature falls below the
Low Limit Setpoint less the Low Limit
Differential the “ZC” terminal and System
Circulator outputs are de-energized and
the oil primary is energized to start the
burner. As temperature rises above the Low
Limit Setpoint the burner is stopped, the
“ZC” output is energized and the System
Circulator is enabled to run in response to a
call for heat.
g. On burner start, if the CAD cell does not
see flame within approximately 15 seconds,
primary control will shut down the burner
and enter into a lockout mode. A lockout is
6 Operating (continued)