Specifications

Armstrong International
IOM-706
Flo-Direct Water Heater
Page 29 of 45
Inspecting Installation
3
Verify that output zero on PLC and relay A light.
4
Confirm that Veri-Flame controller has a solid green light.
5
Verify that burner goes to high fire after flame is established and Veri-
Flame indicates flame.
6
Check temperature on gauge above transfer pump. Adjust incoming water
pressure to obtain target output temperature if necessary.
7
Adjust throttling valve above transfer pump to cycle solenoid (bypass) and
maintain water level in heater.
Note: Level should fluctuate slowly between second and third float switches
without seeing a tank-full fault or pump turning off.
8
Check exhaust piping for leaks.
9
Insert combustion analyzer in port in exhaust stack and tune heater.
• Oxygen reading must be 3.5–6%
• Adjust for minimum carbon monoxide (CO)
Note: Low efficiency may be due to back pressure in exhaust piping if opening
at cap is too small.
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)
• False flame
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.
2
Press "MANUAL START." Verify input zero on PLC lights.
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.