Wiring the Outdoor Sensor
1. There is no connection required if an outdoor sen-
sor is not used in this installation.
2. If using an Outdoor Sensor, connect the sensor
wires to the terminals marked OUTDOOR SEN-
SOR (see wiring diagram). Caution should be
used to ensure neither of these terminals
becomes connected to ground.
3. Use a minimum 18 AWG wire for runs of up to 150
feet.
4. Mount the outdoor sensor on an exterior surface of
the building, preferably on the north side in an
area that will not be affected by direct sunlight and
that will be exposed to varying weather conditions.
Wiring the Indirect Sensor
1. There is no indirect sensor connection required if
an indirect water heater is not used in the installa-
tion.
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 if needed. If an optional Indirect
DHW sensor is connected to J2-1 and J2-2 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 not 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 may also be activated
based on the Indirect DHW piping configuration
setting.
3. Connect the indirect tank sensor to the terminals
marked INDIRECT DHW SENSOR (see wiring
diagram). Caution should be used to ensure nei-
ther of these terminals becomes connected to
ground.
Wiring the Optional 0–10 Volt
Building Control Signal
1. A signal from an energy management system may
be connected to the XFyre boiler. This signal
should be a 0-10 volt positive DC signal, and an
energy management system can be used to con-
trol either the setpoint temperature or the firing
rate of the XFyre boiler.
2. To enable this remote control function, set dip
switch 5 to the UP position on the PIM. Dip switch
5 Toggles between an EMS (UP) signal or a
demand signal from the VERSA (DOWN). Dip
switch 2 on the PIM toggles between a Direct
Drive (UP) input and a Target Temperature
(DOWN) setpoint.
3. For a 4-20mA application, refer to the VERSA IC
Applications Guide.
4. Connect an Energy Management system or other
auxiliary control signal to the terminals marked 0-
10V (+ /-) on the PIM (see Fig. 16). Caution should
be used to ensure that the +0-10V connection
does not create a short to ground.
Wiring the Cascade System
Communication Bus
1. Designate the primary boiler as the master
boiler/boiler1 by leaving dip switch 2 on the
VERSA in the ON position. All other VERSA con-
trols require dip switch 2 to be toggled OFF,
designating them as followers. Follower VERSA’s
are ignored by their corresponding PIM’s. Use
standard 18 AWG wire to connect the master
VERSA to the PIM on the followers. A total of 3 fol-
lowers can be connected to the VERSA on the
master. For systems requiring more than 4 con-
nected boilers, an external sequencer such as the
Raypak Temp Tracker Mod+ Hybrid can be used.
NOTE:
Alternately, a thermostat contact closure can
be used in lieu of the sensor for indirect operation.
Connect the thermostat to the terminals marked IND
REMOTE THERMOSTAT.
CAUTION:
Sensor and control wiring must
NOT
be
run in conduit or chases with line voltage.
22
Summary of Contents for 300A
Page 44: ...WIRING DIAGRAM 44...
