Carlin 702GAS Inst Manual - Manual (Page 15)

Model 702GAS Advanced gas burners — Instruction manual
Carlin part number MN702G Rev. 03/14/11 – 15 –
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
(RM7897C only)
Low-High-Low step modulation
1. To take advantage of the energy-saving potential of the Model 702GAS
gas 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
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.
3. See Figures 14 and 15 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)
To make the RM7987C non-recycle, clip jumper R2, located
under the control’s dust cover (or display, if installed).