Raypak 1005 User Manual

Page 31

Operating Modes

Mode 1 – Not recommended.

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. 31.

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. 32.

Mode 4 – Not recommended.

Mode 5 – Outdoor reset using primary/secondary pip-
ing. The heater is operated as in Mode 2. However, the
target temperature is based on outdoor reset. See Fig.
33.

Mode 6 – Not recommended.

Mode 7 – Designed for an external input signal with
primary/secondary piping. The external input signal
can be provided from a BMS, an EMS or a sequenc-
ing control. The external input signal changes the
boiler target according to a linear scale. The control
operates the boiler burner to maintain the boiler target
at the remote system sensor. See Fig. 34 on the fol-
lowing page.

Mode 8 – This mode is used for remote control of the
heater. The Boil Max setting is the heater shutdown
temperature. The heater is enabled with a control sig-
nal ≥ 0.5 VDC. 0.5 VDC corresponds to minimum fire
an 10 VDC corresponds to 100% firing rate. The BOIL
MAX setting is the heater shutdown temperature.

MODULATING

Fig. 31: Mode 2 Primary/Secondary Piping

MODULATING

Fig. 32: Mode 3 Dedicated DHW

MODULATING

Fig. 33: Mode 5 Primary/Secondary Piping with

Outdoor Reset

*Maximum 4 times the pipe diameter or 12”, whichever is less.

*Some models.