Carlin 702G/O Mass Code Supp. - Manual (Page 5)

Model 702G/O Advanced gas/oil burners — Supplement 1 – Massachusetts Code
Carlin part number MN702GOM Rev. 03/12/08
– 5 –
Where appliance instructions differ from this manual, follow the appliance instructions.
Figure 15 702G/O ladder wiring diagram (burners
with RM7895C or RM7897C primary
only); see Figure 12 for a legend to callouts
Figure 14 702G/O field wiring connections
(RM7895C or RM7897C only)
Low-High-Low step modulation
To take advantage of the energy-saving potential of the Model 702G/O 1.
combination gas/oil 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.
The appliance must be equipped with a high fire control. This would be a
2.
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.
See Figures 14 and 15 to connect the high fire control to the burner firing
3.
rate circuit.
The burner includes a pre-wired manual high-fire switch. Close this switch
4.
to hold the burner in high fire mode. Open the switch to hold the burner
in low fire mode.
5. Wire the burner — RM7895C/RM7897C primary control
(continued)
Replace Instruction manual content:
This page replaces Instruction manual page 17.