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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
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Note:
Start-up process requires running heater in "Manual" mode, which overrides all automation and produces hot water
continuously until heater is manually turned off.
Commissioning
1. Turn on fuel.
-Check for leaks in piping
-Verify that gas pressure is between 2 and 6 psi
2.
Press "MANUAL START."
Note:
During initial start-up, low gas pressure fault light may come on. Once pressure is established, reset pressure switch
several attempts to start may be required until fuel enters burner.
3.
Verify the Burner Status on the HMI is in Normal Operation.
4.
Set your desired Set-point on the HMI.
5.
Check temperature on gauge above transfer pump. Adjust incoming water pressure to obtain target output temperature if
necessary.
6.
Adjust Low and High Speed on Transfer Pump Screen so the VFD cycles between the two speeds.
Level should fluctuate
slowly between second and third float switches without seeing a tank full fault or pump turning off.
7.
Check exhaust piping for leaks.
8.
Insert combustion analyzer in port in exhaust stack and tune heater.
- Oxygen reading must be 3.5–6%
Note:
Low efficiency may be due to back pressure in exhaust piping if opening at cap is too small.
9.
Adjust for minimum carbon monoxide (CO)
10. Record regulator pressure on fuel train label.
11. Confirm operation of all safety features:
-Low gas pressure switch
-High gas pressure switch
-Proof of closure switch
-Low water pressure
-High temperature
-Flame failure (UV scanner)
12. Perform at least ten start cycles in "MANUAL" mode, allowing heater to reach high fire condition each time, to ensure
reliable starting and operation.
13. Run heater in "AUTOMATIC" mode to confirm proper operation in that mode.
14. Allow heater to sit and cool for several hours, then check for cold start.
Never leave heater unattended in "MANUAL" mode.
