49
Blower Check
1. Check blower suction using the manometer
attached to the air pressure tee as shown in
Fig. 55, with the heater firing at 100% input. The
reading should be as noted in Table W for both
natural and propane gas.
2. When firing at 100%, the desired heater com-
bustion CO2 is 9.7% ± 0.5% for natural gas and
11.2% ± 0.5% for propane with CO less than 100
ppm. If this combustion cannot be achieved with
the blower suction within the tolerances specified
in Table S, contact the factory.
Manifold Check
1. Check manifold gas pressure at the gas valve out-
let pressure tap (connection “D” in Fig. 55). This
pressure should read per the values in Table V for
natural and propane gas.
2. If the pressure reading differs by more than ± 0.2
in. WC,
STOP – Call the factory for directions
on what to do next!
CAUTION:
Special manifold and air settings may be
required.
NOTE:
If USER TEST is performed with Cold Water
Protection enabled (VERSA DIP 3 = ON), allow
valve or VS pump test sequence to complete unin-
terrupted or a fault condition may occur.
Model
Air Pressure Setting
(in. WC)
Setting
Tolerance
Nat. Gas
Propane
2505
-4.1
-4.1
±.2 in. WC
3005
-4.1
-4.1
±.2 in. WC
3505
-4.1
-4.1
±.2 in. WC
4005
-1.0
-1.9
±.2 in. WC
Table W: XTherm Air Pressure Settings
Table X: XTherm Manifold Pressure Settings
User Test
Set DIP switch #1 on the VERSA IC control to “ON”.
Set USER TEST = ON in the ‘ToolBox’ Menu to start
the user test function.
• 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.
• On the first press of the Up button, the test step is
held and “HOLD” is flashed at 1Hz.
• On the second press of the Up button, the test
step is incremented.
• If boiler outlet temperature reaches the PIM
Hi-Limit, the boiler will be ramped down to keep
the temperature in a safe range.
• Press of the Up button from Boiler Max will End
the User Test function.
• CWP MUST be enabled (VERSA DIP #3) VALVE
must be functioning during USER TEST.
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.
CWP
CWP Proportional output
Boil 1
Ignite Boiler Burner.
Min 1
Hold Boiler at Min Fire.
Max 1
Ramp Boiler to Max Fire and hold.
Table Y: User Test Fields
Model
No.
Manifold Gas Pressure
(High Fire Values) in W.C.
Natural Gas
Propane Gas
2505
-4.0
-6.7
3005
-6.5
-8.5
3505
-6.1
-9.1
4005
-4.5
-8.2
