Start-Up And Adjustment - Eclipse Combustion RAH Series Manual

4.0 Start-Up And Adjustment

Initial Settings
Start Blower
Start Circulating Fan
Set Air Pressure Drop
Gas
Pressure
Tap
Adjust the linkage of the gas control valve so that when heat is called for, the valve is
10° from fully open, and when cooling is required, the valve is approximately 5° from
fully closed.
Close all manual gas cocks.
With the pilot cock handle in the closed position, remove the top screw and turn the
adjusting screw five turns out from fully closed. See Figure 6.
Start the combustion air blower. Check the
rotation to make sure it is correct. If not,
have a qualified electrician rewire the blower
for proper rotation.
Start the duct circulating fan.
Measure the air pressure drop across the
burner as shown in Figure 7.
Adjust the blower damper until the air pres-
sure drop is 0.5" w.c. for burners on the
pressure side of the circulating fan, or 1.0"
w.c. for burners on the suction side of the
circulating fan.
Large Burners Only: Some models, such
as the 640, 680, and 720 TAH-R burners, contain a butterfly valve in the check valve
line as shown in Figure 8. On these models, after setting the air flow as described in
the previous paragraph, measure the air pressure drop between the gas pressure tap
and duct as shown in Figure 7. Gas flow must be off. Adjust the butterfly valve to pro-
duce an air pressure drop of 0.2" w.c.
Figure 7—Pressure Measurement
Air Pressure
Taps (2)
6
Figure 6—Pilot Cock
Handle Top Screw
(Shown in
Open Position)
Adjusting Screw
(Clockwise for less pilot gas,
Counterclockwise for more pilot gas)
Duct Tap
10" to 20"
Downstream of Burner