Crown Boiler AWR Series Installation Instructions Manual page 25

b) DHW Thermostat - If used, connect to a 24VAC domestic hot water thermostat or 2nd space heating thermostat.
c) Auxiliary Limit Jumper - Used to connect auxiliary limit device. If no such devices are installed, the factory supplied
jumper shown in Figures 9.3 and 9.4 must be installed for boiler to operate.
d) EnviraCOM - Used to connect an EnviraCom thermostat or other approved EnviraCom device to this boiler.
• When making low voltage connections, make sure that no external power source is present in the
thermostat circuits. If such a power source is present, it could destroy the boiler's control. One example
of an external power source that could be inadvertently connected to the low voltage connections is a
transformer in old thermostat wiring.
• Do not attempt to use EnviraCom connections for any purpose not explicitly permitted by the factory.
Attempting to do so may result in unreliable operation and/or damage to controls.
• Do not use the transformer provided on the boiler to power external devices such as zone valves. Doing so
may cause damage to the transformer.
FIGURE 9.1: LINE VOLTAGE FIELD CONNECTIONS
FIGURE 9.2: LOW VOLTAGE FIELD CONNECTIONS
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CAUTION
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