Primera 400B Installation & Maintenance Manual page 22

i. Tag to identify then disconnect wires to the gas valve, blower, pressure switches, etc., as required to remove
the blower and gas train assembly.
j. Disconnect, lift and remove the blower and gas train assembly from the unit bulkhead, exposing the burner.
k. Carefully remove burner, gaskets and Mica sight glass.
l. If the inner screen of the burner is blocked with dust or dirt, it must be carefully cleaned with soap and water. A
garden hose with nozzle spraying through the outer burner surface toward the inside of the burner is helpful.
Do not brush or scrub the burner surface as this can cause permanent damage to the burner material.
m. Looking through the burner opening in the bulkhead, check the heat exchanger surface for sooting (part of
scheduled maintenance). If a blocking amount of soot is present, the heat exchanger must be cleaned and
soot-causing problem corrected.
n. Remove soot from heat exchanger with a medium stiff bristle brush and use a vacuum to remove loose soot
from surfaces and inner chamber, as necessary. Take care not to damage the heat exchanger fins and do not
brush or otherwise disturb the insulation above and below the copper heat exchanger. If further cleaning or if
additional access is required contact Riverside Hydronics
o. Replace all gaskets exposed during disassembly (see item 5 above).
p. To reassemble the unit, maintain the following sequence: 1. Clean the bulkhead gasket surface; 2. Install one
fiberglass burner gasket, aligning gaskets and bulkhead openings; 3. Insert burner through gasket into
bulkhead; 4. Install Mica sight glass over bolts and covering the round sight glass opening; 5. Install second
fiberglass burner gasket over the burner and Mica sight glass, matching the gasket and bulkhead openings; 6.
Carefully reattach the blower and gas train assembly over the burner and gaskets; 7. Continue to reassemble
in reverse order.
q. Cycle unit and test to verify all safety and operating controls are properly functioning and the combustion
chamber is free of leaks.
7. Combustion Air Blower: Check and lubricate the combustion air blower motor on models 750 thru 2000
according to the motor manufacturer's instructions. Some blower motors are permanently lubricated and do not
have lubrication ports. Lubricate with non-detergent SAE 20 oil every 6 months. Clean the blower and blower
motor as required when installed in a dust or dirt contaminated location.
8. Inspect low water cutoffs and relief valves for proper operation at every six months, or more often if indicated
by inspection.
9. Water Circulating Pump: Inspect the pump every 6 months and lubricate according to the manufacturer's
instructions. (Most Riverside Hydronics
10. Keep appliance area clear and free from combustible materials, gasoline and other flammable vapors and
liquids.
11. Check frequently to be sure the flow of combustion and ventilation air is unobstructed to the boiler.
12. This unit uses a transformer to supply a low voltage control circuit. The voltage on the secondary side should
be 24 to 28 VAC, when measured with a voltmeter.
13. All models have a 6 AMP fuse provided on the secondary side of the transformer. A blown fuse indicates a
short in the 24VAC controls that must be corrected.
14. All replacement parts are available through your Riverside Hydronics
address and telephone number located on the first and last page of this manual.
SPECIAL DESIGN APPLICATIONS
The boiler, when used in connection with a refrigeration system, must be installed so the chilled medium is piped in
parallel with the boiler with appropriate valves to prevent the chilled medium from entering the boiler.
The boiler piping system of the hot water boiler (when connected to heating coils located in air handling units where
they may be exposed to refrigerated air circulation) must be equipped with flow control valves or other automatic
means to prevent gravity circulation of the boiler water during the cooling cycle.
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Customer Service for assistance.
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pumps are permanently lubricated and do not have lubrication ports.
22
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Dealer or directly from the Factory at the
34-50 04/02/2010