Carlin 702GAS Supp. - Manual (Page 5)

Model 702GAS Advanced gas burners — Supplement 1 – Massachusetts Code
Carlin part number MN702GM Rev. 11/18/08
– 5 –
Where appliance instructions differ from this manual, follow the appliance instructions.
Figure 15 702GAS ladder wiring diagram (burners
with RM7897C primary only); see Figure 12
for a legend to callouts
Figure 14 702GAS field wiring connections
(RM7895C or RM7897C only)
Low-High-Low step modulation
To take advantage of the energy-saving potential of the Model 702GAS 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.
break-on-rise 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 — RM7897C primary control
(continued)
Replace Instruction manual content:
This page replaces Instruction manual page 15.
If replacing the RM7897C, make sure to render the control non-recycling by clipping
jumper R2, located under the control’s dust cover (or display, if installed).