Venting - Raypak XTherm Series Installation & Operating Instructions Manual

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 con-
tacts is 30 VAC or 30 VDC. See the Field Wiring as
shown in Fig. 29.
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.

Venting

General
CAUTION: Proper installation of flue venting is
critical for the safe and efficient operation of the
heater.
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 pro-
duction 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.
Combustion
Air Supply
From Inside Building
(Non-Direct Venting) Horizontal Through-
From Outside Building
(Direct Venting)
Exhaust
Configuration
Vertical
Venting
the-Wall Venting
Vertical
Venting
Horizontal Through-
the-Wall Venting
Table M: Venting Category Requirements
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 L for appliance category requirements.
NOTE: For additional information on appliance
categorization, see appropriate ANSI Z21 Standard
and the NFGC (U.S.), or B149 (Canada), or applicable
provisions of local building codes.
CAUTION: Condensate drains for the vent piping are
required for installations of the XTherm. Follow vent
manufacturer instructions for installation and loca-
tion of condensate drains in the vent. Condensate
drain must be primed with water to prevent gas flue
leak and must be routed to an appropriate container
for treatment before disposal, as required by local
codes.
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.
NOTE: Ensure that clearances are maintained per
Tables C and D.
Heater Venting Certified
Category Materials
Stainless Steel
II & IV
28
Combustion Air
Inlet Material
UL listed
Galvanized Steel
PVC
ABS
CPVC