PEERLESS PUREFIRE PFW-199, Installation, Operation & Maintenance Manual

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APPENDIX D. 852-1 INTERFACE ADAPTER
E. OPERATION – ALARM CONTACTS
Alarm Output:
a. The alarm output is a normally open dry contact.
If an error is sensed in one of the attached boilers,
the Alarm Output contact closes.
b. This output can be used with either line voltage or
24 volts to power a lamp, buzzer, phone dialer or
building management system.
F. OPERATION – ANALOG INPUT
For external control of setpoint temperature or input rate of
an Infinite Energy Boiler, a 2-10 volt dc analog signal is to
be applied as shown in Figure 2 to the analog input wires.
Input voltage below 2 volts dc will disable boiler
operation. 2 volts corresponds to a boiler setpoint
temperature of 60°F and 10 volts corresponds to a
boiler setpoint temperature of 200°F. Input voltage
between 2 and 10 volts will result in a boiler setpoint
temperature proportional to the difference between
the 2 volt temperature and the 10 volt temperature.
For example, an input of 6 volts will result in a boiler
setpoint temperature of 130°F.
Figure 2: Electrical Wiring
If the analog input is not connected and there is no
connection between the red and red/white Analog
Input wires, the default input voltage is 2.5 Vdc.
Therefore, the boiler will likely run without an analog
input signal. In this case, all of the standard limits
and safety switches will continue to function properly.
NOTICE