49
Blower Check
1. Note the high fire air intake pressure on the swirler
and compare to Table X. Excessively high pres-
sures indicate an obstruction in the air intake or
undersized/too long air intake ducting. With a
clean air filter in place, record the intake air pres-
sure setting on the start-up checklist. Replace the
filter when the intake air pressure increases
by –0.5 in. WC from the reading recorded on the
start-up checklist.
2. The desired combustion CO2 is between 8.5%
and 9.0% for natural gas, and between 9.5% and
10.0% for propane with CO less than 150 ppm.
Combustion should be checked at high and low
fire (Max. and Min. fan speed).
CAUTION:
Special manifold and air settings may
be required.
Model
High Fire
(in. WC)
Tolerance
(in. WC)
300A
-1.0
± 0.2
400A
-1.6
± 0.2
500A
-1.3
± 0.2
700A
-0.8
± 0.2
850A
-1.3
± 0.2
Table X: Air Intake Pressures
with Clean Filters Installed
Table Y: XFyre Manifold Pressures
Model
No.
Natural Gas
Propane Gas
High Fire (in. WC) High Fire (in. WC)
300A
-1.0 ± .1
-1.0 ± .1
400A
-1.5 ± .1
-1.6 ± .1
500A
-1.2 ± .1
-1.3 ± .1
700A
-1.4 ± .1
-1.0 ± .1
850A
-1.7 ± .2
-3.4 ± .2
Start-Up
1. Turn power on.
2. Turn on the boiler. Approximately 10 seconds after
the blower starts, the igniter should start to spark
(observable through the observation port located
at the front, bottom of the boiler) and the gas valve
will open. Look into the sight glass located at the
bottom of the front panel to check igniter opera-
tion.
3. The boiler ignites at 3000 RPM (as indicated on
the LCD display of the user interface).
4. This boiler is equipped with a standard three-try
ignition module, it will try for ignition up to three
times before going into lockout. If the boiler is
equipped with the optional single-try ignition mod-
ule (sales option C-6), it will try for ignition one
time before going into lockout.
5. Wait until the controller indicates 100% on the fir-
ing rate display screen. This may take several
minutes.
User Test
Set DIP #1 on the VERSA IC control to “ON”. Set
USER TEST = ON in the 'ToolBox' Menu to start the
user test function. See Table Z.
•
USER TEST is displayed in the Title Field.
•
UP keystrokes are used to advance through the
user test.
•
The Boil MIN/MAX steps for burner operation are
only run for enabled boilers.
•
Local Heat/DHW/EMS demands
must
be present
for burner operation.
Number
Field
Output Action
SYS
System Pump relay turns on.
DHW
DHW Pump relay turns on.
PMP 1
System and Boiler Pump relays turn on.
Boil 1
Ignite Boiler Burner.
Min 1
Hold Boiler at Min Fire.
Max 1
Ramp Boiler to Max Fire and hold.
Table Z: User Test Fields
Manifold Check
1. Check manifold gas pressure at the manifold pres-
sure tap (connection “B” in Fig. 42). This pressure
should read per the values in Table Y for natural
and propane gas.
2. If the pressure reading differs by more than
± 0.2 in. WC,
STOP – Call the factory for direc-
tions on what to do next!
