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7. Check operation of safety devices. Refer to
manufacturers' instructions.
8. Follow oil-lubricating instructions on pump (if
required). Over-oiling will damage pump. Water-
lubricated circulators do not need oiling.
9. To avoid potential of severe burn, DO NOT REST
HANDS ON OR GRASP PIPES. Use a light touch;
return piping will heat up quickly.
10. Check blower and blower motor.
11. Check for piping leaks around pumps, relief valves
and other fittings. Repair, if found. DO NOT use
petroleum-based stop-leak.
Periodically
1. Check
relief
valve.
instructions on valve.
2. Test low water cut-off (if equipped). Refer to
manufacturer's instructions.
Preventive Maintenance Schedule
The following procedures are recommended and are good
practice for all MVB installations.
Daily
1. Check gauges, monitors and indicators.
2. Check instrument and equipment settings. "Post
Start-Up Check" on page 45.
3. Check burner flame. (Should see light blue flame at
full input rate).
Weekly
For low-pressure heaters, test low-water cut-off device.
(With heater in pre-purge, depress the low water cut-off
test button. Appliance should shut off and ignition fault
light should come on. Depress reset button on front of
heater control panel to reset).
Monthly
1. Check flue, vent, stack, or outlet dampers.
2. Test blower air pressure. "Blower Check" on page
43.
3. Test high and low gas pressure interlocks (if
equipped). "Safety Inspection" on page 44.
50
Refer
to
manufacturer's
Semi-Annually
1. Recalibrate all indicating and recording gauges.
2. Check flame failure detection system components.
3. Confirm firing rate on the unit by clicking on the view
icon and selecting the Master Info screen.
4. Check piping and wiring of all interlocks and shutoff
valves.
5. Check air filter and replace as necessary.
Annually
1. Test flame failure detection system and pilot
turndown.
2. Test high limit and operating temperature. "Post
Start-Up Check" on page 45.
3. Check flame sensor.
4. Conduct a combustion test at full fire. Carbon dioxide
should be 8.5 to 9.5% at full fire for natural gas, and
9.7 to 10.7% for propane gas. Carbon monoxide
should be < 150 ppm.
5. Check emission at minimum fire and record CO and
CO2 reading. CO must be less than 100 ppm for all
fuels. CO2 must be between 7.5 to 9.0% for natural
gas, 8.5% and 10.0% for propane gas. If CO and
CO2 are not within these ranges, stop running the
unit and contact your Raypak representative.
6. Check valve coil for 60 cycle hum or buzz. Check for
leaks at all valve fittings using a soapy water solution
(while heater is operating). Test other operating parts
of all safety shutoff and control valves and increase or
decrease settings (depending on the type of control)
until the safety circuit opens. Reset to original setting
after each device is tested.
7. Perform leakage test on gas valves. See Figure 44.
8. Inspect and clean burner using shop air.
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