In order to obtain the rated capacity of the instantaneous domestic hot water coil limit control should be set to maintain 200° F boiler water temperature.
Flow regulator and tempering valve should be installed on all instantaneous domestic hot water coil systems.
BURNER SETTING
The burner is adjusted at the factory before shipment but in case of improper operation at some future date Figure 1 will show proper setting. In all cases the flame retention ring should be concentric with the choke.
FIGURE 1
| MODEL NO. | NOZZLE DELAVAN SIZE | CHOKE RING NO. & DIAMETER | "A" DIM. | I. D. VANES |
| 87CPO | 1.25 GPH 70° A | 142640-002 2-5/8 D | FLUSH | 2-25/32 |
| 108CPO | 1.65 GPH 60° A | 142641 2-31/32 D | -3/16" | 2-25/32 |
| 128CPO | 2.00 GPH 70° A | 142641-003 2-31/32 D | +1/4" | 2-29/32 |