Venting
General
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-pos-
itive vent static pressure and with a vent gas
temperature that avoids excessive condensate pro-
duction in the vent.
Category II
– A heater which operates with a non-pos-
itive 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 M for appliance category requirements.
XFyre WH models are approved for use with
PVC/CPVC venting on all model sizes. XFyre H mod-
els 300, 400 and 500 are also approved for use with
PVC/CPVC venting while models 700 and 850 must
use stainless steel venting due to the ability to operate
at temperature exceeding the rating of the plastic
material.
Use only PVC or CPVC vent material (in Canada,
ULC-S636 approved plastic material must be used) or
special gas vent pipes listed for use with Category IV
gas burning heaters, such as the AL29-4C stainless
steel vents offered by Heat Fab Inc. (800-772-0739),
Protech System, Inc. (800-766-3473), Z-Flex (800-
654-5600) or American Metal Product (800-423-4270).
Pipe joints must be positively sealed. Follow the vent
manufacturer’s installation instructions carefully.
Centrotherm™ polypropylene vent material is also
approved to be used on XFyre products. A vent
adapter (sales option D-33) must be used to ensure a
proper seal of the flue and condensate. The vent
NOTE:
For additional information on appliance
categorization, see the ANSI Z21.13 Standard and
the NFGC (U.S.), or B149 (Canada), or applicable
provisions of local building codes.
CAUTION:
Proper installation of flue venting is
critical for the safe and efficient operation of the
boiler.
WARNING:
Contact the manufacturer of the vent
material if there is any question about the appliance
categorization and suitability of a vent material for
application on a Category IV vent system. Using
improper venting materials can result in personal
injury, death or property damage.
Alarm Connection
An alarm bell or light may be connected to the alarm
contacts on the boiler PIM. The Alarm Contacts are
3A rated dry contacts on a normally-open relay that
close during fault or lockout conditions, and the maxi-
mum voltage across the contacts is 30 VAC or 30
VDC. Connections are made at J1 pins 1 and 2.
In a cascade system, in the event of an alarm condi-
tion at one or more units, all alarm contacts within the
cascade will be energized indicating a fault condition.
26
Fig. 23: VERSA Follower
Connections
used during
“Limp Along”
mode only
G
W
BK
G
(12 AWG)
(12 AWG)
(12 AWG)
P/N 902017 REV 1
HOT
(120V)
1
2
3
4
5
6
7
8
9
10
11
12
HOT
(120V)
BOILER
PUMP
1 HP MAX
DHW
PUMP
5A MAX
SYSTEM
SUPPLY
PUMP
COM
GND
HOT
(120V)
COM
GND
HOT
(120V)
COM
GND
COMMON
GROUND
W
BK
Modbus BMS Communication
The VERSA IC control is equipped as standard with a
communications port for connectivity to building
automation via Modbus protocol. Refer to the VERSA
IC Applications Guide for further information.
