Raypak MVB 1104A, Installation & Operating Manual

Page: 47 / 64

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Blower Check
1. Check blower suction using the manometer
attached to the air pressure tee, with the heater fir-
ing at 100% input. The reading should be as noted
in Table T for both natural and propane gas.
2. When firing at 100%, the desired heater combus-
tion CO2 is 9.0% ± 0.5% for natural gas and
10.2% ± 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 T, contact the factory.
Manifold Check
1. Check manifold gas pressure at the gas valve out-
let pressure tap (connection “D” in Fig. 43). This
pressure should read per the values in Table U 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.
Table T: MVB Air Pressure Settings
Table U: MVB 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.
Table V: User Test Fields
Model
Air Pressure Setting
(in. WC)
Setting
Tolerance
Nat. Gas Propane
504A -4.1 -4.3 ± 0.2 in. WC
754A -4.1 -4.3 ± 0.2 in. WC
1104A -4.1 -4.3 ± 0.2 in. WC
1504A -4.1 -4.3 ± 0.2 in. WC
2004A -4.1 -4.3 ± 0.2 in. WC
Model
Manifold Gas Pressure Setting
High Fire Values (in. WC)
Natural Gas Propane Gas
504A -4.1 -4.4
754A -4.6 -5.8
1104A -4.6 -7.2
1504A -7.0 -9.2
2004A -4.4 -8.1
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.