25
FACTORY WIRING
FIELD
WIRING
BLOCKS
Fig. 29: Low Voltage Field Wiring
Wiring the Indirect Sensor
1. An indirect sensor connection is not required if an
indirect water heater is not used in the installation.
2. When the Indirect DHW call for heat is active,
the PIM communicates this to the VERSA. The
VERSA calculates the optimal operation and
sends the firing rate and pump output requests to
the PIM so it can activate the Indirect DHW pump
and Boiler pump as needed. If an optional Indirect
DHW sensor is connected, the PIM will pass this
signal to the VERSA. This allows the VERSA to
optimize the Indirect DHW demand to maintain
the Indirect DHW setpoint. The Indirect DHW
thermostat switch closure is still required when
using the Indirect DHW sensor. If a VERSA is not
present the PIM shall activate the Indirect DHW
pump whenever the Indirect DHW call is active.
The Boiler pump will also be activated based on
the Indirect DHW piping configuration setting.
Consult the VERSA IC manual (Cat. 5000.72) for
additional configurations.
3. Connect the indirect tank sensor to the terminals
marked INDIRECT DHW SENSOR (see wiring
diagram). Caution should be used to ensure
neither of these terminals becomes connected
to ground. When using an indirect DHW sensor
to control tank temperature, contact closure is
required across the indirect override connections
for proper operation. To ensure proper operation
during “limp along” mode set PIM operator dial to
be equal to DHW Target temperature to prevent
an over temperature condition from occurring. see
VERSA IC manual (Cat. 5000.72).
NOTE:
Alternately, a thermostat contact closure can
be used in lieu of the sensor for indirect operation.
Connect the thermostat to the terminals marked
INDIRECT DHW OVERIDE.
CAUTION:
Sensor and control wiring must
NOT
be
run in conduit or chases with line voltage.
Содержание XTherm 2505
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