Install Instructions

59
SECTION XII: OPERATING
A. WATER BOILERS SEQUENCE OF
OPERATION
1. Water Boilers Without Tankless Heaters (Cold
Start), Sequence Of Operation:
a. The V8H Boiler is equipped with a Cold Start
Intelligent Oil Boiler Control (Cold Start
Boiler Control). The Cold Start 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 Cold Start Boiler Control
display. See Table 5 and Figure 32.
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 res until the
thermostat is satised.
d. If the thermostat is not satised 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 satised 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 Cold Start 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
ame 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 ame is lost while the burner is ring, 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,
ame 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 V8H 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 Warm Start Boiler Control
display. See Table 5 and Figure 32.
c. When the thermostat calls for heat the Warm
Start 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 res
until the thermostat is satised. 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 .
Figure 32: Intelligent Oil Boiler Control
Status Codes Displayed in  Mode
 Status Description

Standby
(burner off,
pump off)
No call for heat detected

Standby
(burner off,
pump on)
Either condition is true:
a. Call for heat detected and boiler
temperature higher than operating
setpoint.
b. Call for heat detected and boiler
temperature higher than 140 F and
Pump Pre-Purge Time has not
expired.
 Running
The burner runs until the call for heat is
satised.
 Self Test Control internal checking
TABLE 5: SEQUENCE OF OPERATION