Controls; Ignition Control Module; Outdoor Air Reset Temperature Controller (Standard For Hd101-Hd301 Type H) - Raypak HD401 Installation & Operating Instructions Manual

CONTROLS

WARNING: Installation, adjustment and service of
heater controls including timing of various operating
functions must be performed by a qualified installer,
service agency or the gas supplier. Failure to do so
may result in control damage, heater malfunction,
property damage, personal injury, or death.
WARNING: Turn off the power to the heater before
installation, adjustment or service of the heater
controls. Failure to do so may result in heater
malfunction, property damage, personal injury, or
death.
CAUTION: This appliance has provisions to be
connected to more than one (1) supply source. To
reduce the risk of electric shock, disconnect all such
connections before servicing.
CAUTION: Risk of electric shock. More than one
(1) disconnect switch may be required to de-
energize the equipment before servicing.

Ignition Control Module

The interrupted proved ignition device conserves ener-
gy. When additional heat is needed, the combustion air
blower starts to purge all air from the combustion
chamber for about 15 seconds. On proof of air flow,
the air proving switch closes and the igniter is ener-
gized, eliminating the fuel costs of maintaining a
constant pilot.
To ensure safe operation, the gas valve cannot open
until the igniter is verified as capable of igniting the
gas. The ignition module is an electronic device which
closes the main gas valve within 8/10 of a second
whenever the flame is interrupted. The main burner is
automatically lit when the device is powered and pre-
purged. The unit performs its own safety check.
Fig. 24: Ignition Module
Outdoor Air Reset
Temperature Controller
Models HD101 through HD301 Type H are factory
equipped with an electronic outdoor air reset tempera-
ture controller. This controller is also an available
option for model HD401 and for all Type WH models.
The standard configuration provides for outdoor air
reset of the system target water temperature based on
a user defined reset ratio. The controller will reset
between 120°F and 200ºF system water temperature
and allow for a maximum boiler outlet of 210°F. The
controller will provide two stage firing of the heater.
The controller is also equipped with a connection for
an external thermostat input for use with an indirect
load such as an indirect DHW tank for hot water pro-
duction. When used for direct DHW in conjunction with
a storage tank, the controller can be configured to pro-
vide fixed set point operation.
The primary functions of the controller are set using
the Operating Temperature dial and the DIP switches.
See Table O. The controller has 4 LEDs to indicate the
its condition:
Power - On Solid - Turns on when 24 Vac Power is
present.
Heat Call - On Solid - Turns on when Heat Call (short
or 0-32 Vac) is present.
Flashing - Boiler outlet sensor error. While
present, operation ceases.
IND Call - (Indirect DHW) On Solid - Turns on when
IND Call (short or 0-32 Vac) is present.
Flashing - System supply sensor error.
While present, operation continues using
boiler outlet sensor.
wwSD - On Solid - Turns on when in Outdoor
Reset AND WWSD Active AND control in
WWSD.
Flashing - Outdoor sensor error. While
present, operation continues with Fixed
boiler target of 140 based on 32°F.
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