Finned copper tube gas boilers & water heaters – Boiler Manual
Finned copper tube gas boilers & water heaters – Boiler Manual
23
F
Figure 15
Figure 16
HeatNet Control Panel
17. Close main isolation gas valve (fi eld supplied), Figure 14.
18. Remove the manometer fi tt ing from the pilot test port and
replace the plug. Place monitor tube on to the test port tee
located along the 1/8 in hose piped directly off of the manifold
test port, Figure 15.
MANUAL RESET
PUMP MOTOR
RELAY
TRANSFORMER
FLAME
SAFEGUARD
MODULE
HEAT NET
CONTROL
BOARD
PROTOCESSOR
MODULE
(OPTIONAL)
LOCAL REMOTE
SWITCH
TEST RUN
SWITCH
POWER SWITCH
IGNITION STATUS
WINDOW
SELECT BUTTON
BACK
BUTTON
DISPLAY
WINDOW
UP BUTTON
DOWN BUTTON
19. Switch the Honeywell 7800 back to “run”.
20. Create a min input demand as before (enable Low Fire Hold
switch). Th e boiler will begin the start sequence.
21. Monitor the fl ame current on the 7800. No fl ame current should
be detected and the 7800 should lock out. If fl ame current is
detected at any time up to the 7800 locking out, the 120V wiring
on the ignition transformer must be reversed and the test run
again to insure that no fl ame is detected.
Improper wiring of the ignition transformer can result
in an explosion causing extensive property damage,
severe personal injury or death!
22. Open main isolation gas valve (fi eld supplied).
23. Reset the Honeywell 7800. Th e boiler will start and will run at
minimum input rate.
24.
Sett ing the low fi re:
Allow the low fi re to sett le out for a
few minutes and observe the combustion reading. Refer to
“Combustion Reading” table for proper combustion readings
and elbow pressure, Table 13.
Th e low fi re O
2
-CO
2
can be adjusted in the fi eld by opening
the low fi re adjustment door located on the forward facing side
of the main gas valve, see Figure 15. Inserting an allen wrench
and rotating the allen screw clock-wise will increase the CO
2
and lower the O
2
, rotating counter clock-wise will decrease the
CO
2
and increase the O
2
.
DO NOT LEAVE THE BURNER
IN AN INFRA
RED STATE.
A few random speckles of red
are fi ne, but large concentrations of spots or large areas of red
are not. If large amounts of red concentrations are observed,
verify combustion readings.
25. Jumper the “AA” terminals located on the HeatNet control board.
Th e boiler input will rise to its maximum input, “Run 100%”,
see Figure 19.
26. Allow the boiler to reach steady state and verify supply gas
pressure and check input rates as explained in the “Gas Supply
Piping” section. Also, refer to “Combustion Reading” table for
proper combustion readings and elbow pressure, Table 13.
Th e high fi re trim is located on the outlet fl ange of the gas valve,
see Figure 15. O
2
-CO
2
can be adjusted by inserting a screwdriver
and rotating clock-wise to increase the CO
2
and lower the O
2
.
Rotating counter clock-wise will decrease the CO
2
and increase
the O
2
.
27. Remove jumper “AA” and allow boiler to sett le into minimum
input. Observe the combustion readings and make any fi nal
adjustments. When fi nished disable the Low Fire Hold switch
and replace test ports to normal state.
28. Boiler allows for many modes of operation and control methods.
Reference the “HeatNet Control” manual.
Table 13
Combustion Readings
Natural Fuel
Propane Fuel
CO
2
%
8.0 - 8.5 (min.)
9.4 - 9.9 (min.)
8.8 - 9.8 (100%)
10.3 - 11.5 (100%)
O
2
%
6.6 - 5.8 (min.)
6.6 - 5.8 (min.)
5.2 - 3.5 (100%)
5.2 - 3.5 (100%)
*For factory set gas manifold (elbow) pressures see label on
inner cabinet door.
