Venting - General - Raypak Xfiire 300B Installation And Operation Manual

Cascade System Pump and Sensor Wiring
1. On the heater designated as the Master, connect the
system pump enable wiring to the field-wiring terminal
block inside the junction box. The connections are
dry contacts rated for pilot duty only (5A maximum).
2. Connect the system supply sensor to terminals 6
and 7 on the field wiring strip located on the Master
heater. See Figure 26.
MASTER
IND DHW SYSTEM BOILER
PUMP DRY CONTACTS
USE COPPER CONDUCTORS ONLY
TERMINAL BLOCK
DEDICATED
240VAC
POWER
240VAC COIL
A
B
Figure 30. XFiire Cascade System Pumps (240VAC
Shown)
3. Connect the Outdoor sensor (if used) to terminals 8
and 9 on the field wiring strip located on the Master
heater. See Figure 26.
4. Connect the Enable/Disable wiring to terminals 11
and 12 on the field wiring strip located on the Master
heater. This connection must be provided through dry
contacts closure. See Figure 26. Applying 24VAC to
these terminals will result in blowing the fuse on PIM.
NOTE: The dry contacts closure can come from a room
thermostat or a remote relay. No power of any kind
should be applied to either of these terminals.
Cascade Follower Pump and Sensor Wiring
1. Once the primary heater has been identified,
additional heaters will be designated as follower
heaters. Ensure DIP switch 2 on each follower
VERSA is set to the OFF/Down position.
2. For Cascade configurations System pump and
DHW pump, Follower outputs must be connected
in parallel respectively in order to support operation
during "limp-along" operation.
FOLLOWER
IND DHW SYSTEM BOILER
PUMP DRY CONTACTS
USE COPPER CONDUCTORS ONLY
TERMINAL BLOCK
PUMP
240VAC/1PH
RELAY
SYSTEM PUMP
Modbus BMS Communication
The VERSA IC is equipped as standard with a
communications port
automation via Modbus protocol.
Refer to the VERSA IC Manual (5000.72) for further
information. The XFiire may be equipped with protocol
converter. See Catalog 5000.73 and wiring diagram.
Alarm Connection
An alarm annunciator or light may be connected to the
alarm contacts on the field wiring terminal strip.
The Alarm Contacts are 3A rated dry contacts on a
normally-open relay that close during fault or lockout
conditions, and the maximum voltage across the contacts
is 30 VAC or 30 VDC. See the Field Wiring as shown in
Figure 26.
In a cascade system with an alarm condition at one or
more units, all alarm contacts within the cascade will be
energized indicating a fault condition.

Venting - General

A CAUTION: Proper installation of flue venting is
critical for the safe and efficient operation of the heater.
NOTE: Raypak strongly recommends installing the vent
system before water piping. This will ensure that the
venting system and associated components will fit into
the allotted space for proper operation.
Appliance Categories
Heaters are divided into four categories based on the
pressure produced in the exhaust and the likelihood of
condensate production in the vent.
Category I – A heater which operates with a non-positive
vent static pressure and with a vent gas temperature that
avoids excessive condensate production in the vent.
Category II – A heater which operates with a non-positive
vent static pressure and with a vent gas temperature that
may cause excessive condensate production in the vent.
Category III – A heater which operates with a positive
vent pressure and with a vent gas temperature that avoids
excessive condensate production in the vent.
Category IV – A heater which operates with a positive
vent pressure and with a vent gas temperature that may
cause excessive condensate production in the vent.
See Table P for appliance category requirements.
for connectivity to building
27