Accessories; Venting; General Venting Requirements - Arcoaire N8MSN Series Installation Instructions Manual

The 24−v circuit contains an automotive−type, 3−amp. fuse
located on the control. Any direct shorts during installation,
service, or maintenance could cause this fuse to blow. If fuse
replacement is required, use ONLY a 3−amp. fuse of identical
size.

ACCESSORIES

1. Electronic Air Cleaner (EAC):
Connect an accessory Electronic Air Cleaner (if used)
using 1/4−in female quick connect terminals to the two
male 1/4−in quick−connect terminals on the control
board marked EAC 1 AMP and NEUTRAL. The termin-
als are rated for 115 VAC, 1.0 amps maximum and are
energized during blower motor operation. (See
Figure 24)
2. Humidifier (HUM 24VAC and HUM)
a. HUM 24VAC: Connect an accessory 24
VAC, 0.5 amp maximum humidifier (if used) to the
1/4−in male quick−connect HUM 24VAC terminal
and C screw terminal on the control board thermo-
stat strip. The HUM 24VAC terminal is energized
when there is a call for heat (W) and the pressure
switch (PRS) closes. (See Figure 24 and Figure 48).
b. HUM: Connect an accessory 115VAC (EAC
and HUM are 1 amp maximum combined) humidifier
(if used) to the ¼−inch male quick connect HUM
terminal and NEUTRAL ¼−inch quick connect. The
HUM terminal is energized when the inducer motor
is energized (IDR). (See Figure 24 and Figure 48).
NOTE: A field−supplied, 115−v controlled relay connected to
EAC terminals may be added if humidifier operation is
desired during blower operation.
NOTE: DO NOT connect furnace control HUM 24VAC
terminal to H (humidifier) terminal on humidity sensing
thermostat, or similar device.
thermostat, thermostat,
instructions for proper connection.

VENTING

The furnace shall be connected to a listed factory built
chimney or vent, or a clay−tile lined masonry or concrete
chimney. Venting into an unlined masonry chimney or
concrete chimney is prohibited.
When an existing Category I furnace is removed or replaced,
the original venting system may no longer be sized to
properly vent the attached appliances. An improperly sized
Category I venting system could cause the formation of
condensate in the furnace and vent, leakage of condensate
and combustion products, and spillage of combustion
products into the living space.
Vent system or vent connectors may need to be resized. Vent
systems or vent connectors, must be sized to approach
minimum size as determined using appropriate table found in
the NFGC.

GENERAL VENTING REQUIREMENTS

Follow all safety codes for proper vent sizing and installation
requirements, including local building codes, the National
Fuel Gas Code ANSI Z223.1−2012/NFPA 54−2012 (NFGC),
Parts 12 and 13, local building codes, and furnace and vent
manufacturers' instructions.
441 01 1402 06
See humidity sensing
or controller manufacturer's
Specifications are subject to change without notice.
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each appliance
connected to the venting system being placed into operation
could result in carbon monoxide poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into operation,
while all other appliances connected to the venting system
are not in operation:
1. Seal any unused openings in venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI
Z223.1/NFP A 54 and these instructions. Determine that there
is no blockage or restriction, leakage, corrosion and other
deficiencies, which could cause an unsafe condition.
3. As far as practical, close all building doors and windows
and all doors between the space in which the appliance(s)
connected to the venting system are located and other
spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connected to
the venting system. Turn on any exhaust fans, such as range
hoods and bathroom exhausts, so they are operating at
maximum speed. Do not operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance being
inspected into operation. Adjust the thermostat so appliance
is operating continuously.
7. Test for spillage from draft hood equipped appliances at the
draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle.
8. If improper venting is observed during any of the above
tests, the venting system must be corrected in accordance
with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 .
9. After it has been determined that each appliance
connected to the venting system properly vents when tested
as outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas−fired burning appliance
to their previous conditions of use.
These furnaces are design−certified as Category I furnaces in
accordance with ANSI Z21.47−2012/CSA 2.3−2012 and
operate with a non−positive vent static pressure to minimize
the potential for vent gas leakage. Category I furnaces
operate with a flue loss not less than 17 percent to minimize
the potential for condensation in the venting system. These
furnaces are approved for common venting and multistory
venting with other fan assisted or draft hood equipped
appliances in accordance with the NFGC, the local building
codes, and furnace and vent manufacturers' instructions.
The following information and warning must be considered in
addition to the requirements defined in the NFGC.
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury
or death.
Do not bypass the draft safeguard switch, as an unsafe
condition could exist which must be corrected.
1. If a vent (common or dedicated) becomes blocked, the
furnace will be shut off by the draft safeguard switch
located on the vent elbow.
2. Do not connect this Category I furnace into a single−
wall dedicated or common vent. The dedicated or com-
mon vent is considered to be the vertical portion of the
vent system that terminates outdoors.
3. Vent connectors serving Category I furnaces shall not
be connected into any portion of a mechanical draft
system operating under positive pressure.
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