Install Instructions

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109837-01 - 5/20
PVCG-C
Installation, Operating & Service Manual
c. Auxiliary Limit Jumper - Used to connect
auxiliary limit device. If no such devices are
installed, the factory supplied jumper shown in
Figures 9.2 and 9.3 must be installed for boiler
to operate.
d. EnviraCOM - Used to connect an EnviraCom
thermostat or other approved EnviraCom
device to this boiler.
Notice:
• 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 9.2: Low Voltage Connections
Figure 9.1: Line Voltage Connections
9 Wiring (continued)