MN702GE 060320
– 16 –
Low-High-Low step modulation
1.
To take advantage of the energy-saving potential of the Model 701GAS
burner, it should be wired to operate at low-high-low cycles. The firing
cycle can be much longer using low-high-low firing, because the burner
can cycle to low fire as demand decreases. This keeps the burner on
longer, reducing cyclic losses.
2.
The appliance must be equipped with a high fire control. This would be a
make-on-fall control, either temperature (water boiler) or pressure (steam
boiler) activated. Read the appliance manual for the location of the high
fire control, when used.
3.
See Figures 7 and 8 to connect the high fire control to the burner firing
rate circuit.
4.
The burner includes a pre-wired manual high-fire switch. Close this switch
to hold the burner in high fire mode. Open the switch to hold the burner
in low fire mode.
4. Wire the burner — RM7897C primary control
(continued)
Turn off power to appliance when servicing burner. Failure
to comply could result in severe personal injury, death or
substantial property damage.
Figure 8A
Legend for Figure 8
Figure 8
702GAS Mass Code
wiring diagram (burners
with RM7897C primary
only); see Figure 8A for
a legend to callouts