Testing And Maintenance - Smith HW 420 Instruction Manual

Where required by the local authorities having jurisdiction, a fuel
cleaning device such as a filter or strainer should be installed in
the main gas supply line to the unit (see Figure 1 on Page 3).
A gas service pressure regulator is required to maintain the
gas supply pressure below the maximum allowable pressure
indicated on the appliance rating plate. A gas pressure relief
valve, if required by the local code authority, should be installed
upstream of all operating and safety controls in the gas train
and downstream of the gas pressure regulator in the gas supply
line (see Figure 1 on Page 3).
Pertinent operating, cleaning and testing procedures are outlined
in this supplement in the TESTING AND MAINTENANCE section.
A Manufacturer's/Installing Contractor's Report for ASME CSD -
1 Certification and Reporting (CG-500) requirements is provided
with the instructions. This report shall be made available to
the authorized inspection agency or the inspector for action
as required by the local jurisdiction. Installing contractors shall
maintain a data report for each installation completed. It is the
responsibility of the installing contractor to deliver the pertinent
operating, cleaning and testing procedures together with the
complete wiring and piping diagrams, to the owner/user and to
obtain a receipt for the instructions. The receipt shall be filed with
the installation report.
ITEMS
1. Gauges and Indicators
2. Burner Flame
3. Pilot Burner
4. Flame Failure Detection
5. Gas Valves
6. Flow Switch
7. Vent System
8. Optional Power Vent
9. Burner Components
10. Heat Exchanger Assembly
11. Transformer
12. Manual Reset High Limit and
Auto Reset High Limit
13. Safety Valves
14. Drip Leg and Gas Strainer

TESTING AND MAINTENANCE

TABLE 1. PERIODIC TESTING PROCEDURES
FREQUENCY ACCOMPLISHED BY
Daily
Daily
Daily
Weekly
Weekly
Weekly
Monthly
Monthly
Monthly Service Technician
Semi-Annually Service Technician
Semi-Annually Service Technician
Annually Service Technician
As Required
As Required
TESTING AND MAINTENANCE
Periodic testing of all boiler controls and safety devices is
required to verify correct operation. Precautions shall be taken
to protect against bodily injury or property damage while tests
are being conducted. Cover plates that require removal in
order to gain access to items requiring maintenance or testing
shall be replaced before the boiler is put back in service. Since
it is essential to have all control and safety devices operating
as intended at all times, a periodic testing and maintenance
schedule should be set up and followed with results being logged
on a regular basis. Operators or maintenance technicians should
follow the recommended procedures set forth in the instructions
and allow for any additional circumstances that arise based on the
particular installation when preparing a maintenance program.
The operator or technician should thoroughly understand the
operating procedures and be able to recognize an equipment
malfunction. Obtain a receipt for the instructions. The receipt
shall be filed with the installation report.
Table 1, provided herein is a recommended guideline to follow
for periodic testing of the boiler's safety devices and controls.
Detailed maintenance procedures are included here as well.
Operator Visually inspect, log observations.
Operator Visually inspect for uniform blue flames.
Operator Visually inspect for uniform flame envelope.
Operator Close Pilot Manual Shutoff Valve, check
safety shutdown time, log results.
Operator Open Operating Control, listen for valve
closure, check for voltage.
Operator See detailed instructions.
Operator See detailed instructions.
Operator See detailed instructions.
See Owner's Manual
See detailed instructions.
Check primary and secondary voltage, log
results.
See detailed instructions.
Operator See detailed instructions.
Operator See detailed instructions.
6
REMARKS