Raypak 503-2003 - Manual (Page 31)

31
Operating Modes
Mode 1 – Setpoint operation using primary piping. The
heater outlet water temperature is controlled to the
boiler target setpoint. See Fig. 27.
Mode 2 – Setpoint operation using primary/secondary
piping. The control operates the heater to satisfy a
remote system sensor. The heater is turned off based
on boiler max and boiler differential (factory default).
See Fig. 28.
Mode 3 – Dedicated DHW operation using UniTemp
80 piping. A call for heat is determined by the DHW
sensor and the DHW boiler target. The heater outlet
water is also controlled to the boiler target tempera-
ture. See Fig. 29.
Mode 4 – Outdoor reset using primary piping. The
heater is operated as in Mode 1. However, the target
temperature is based on outdoor reset. See Fig. 30.
MODULATING
Fig. 27: Mode 1 Primary Piping
MODULATING
*
Fig. 28: Mode 2 Primary/Secondary Piping
MODULATING
Fig. 29: Mode 3 Dedicated DHW
MODULATING
Fig. 30: Mode 4 Primary Piping with Outdoor Reset
*Maximum 4 times the pipe diameter or 12”, whichever is less.