HANDLING MANUAL
SERVICE MANUAL
RAYPAK HI DELTA BOILERS/WATER HEATERS
WITH FAN ASSISTED PREMIX BURNERS
39
3.9.1.
External thermostat or stage-controller via voltage-free contacts
the second stage of the controller must be connected to
the second burner stage, and so on.
One thermostat or controller stage can control several
burner stages, if the thermostat or the controller stage is
connected to the lowest of the burner stages intended to
be operated together and the other stages must be
jumpered.
For example: Four stage Hi-Delta can be operated as a
two stage boiler so that the 1
st
and 2
nd
burner stages are
to be started by the 1
st
stage of an external stage
controller. The 1
st
stage of the stage controller must be
connected to the 1
st
burner stage and the 2
nd
burner stage
must be jumpered for this.
The 3
rd
and 4
th
burner stages shall be started by the 2
nd
stage of the controller! The 2
nd
stage of the controller
must be connected to the 3
rd
burner stage and the 4
th
burner stage must be jumpered for this! There are
configurations, which are possible at some models only.
See at 4.2.4.
The Hi-Delta will operate as a multi-stage appliance when
the appropriate burner stages of it are connected to an
external multi-stage thermostat or stage-controller. The 1
st
stage of the controller must be connected to the first
burner stage of the appliance,
!
Only voltage-free contacts are allowed to be
connected to the burner stages. The
connection of external stage controllers or
thermostats is allowed to be carried out only
by an authorized service.