ACCESSORIES
1. Electronic Air Cleaner (EAC)
The furnace control EAC terminals are energized with 115v
(1.0-amp maximum) during blower operation.
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
and EAC-2. The terminals are rated for 115VAC, 1.0 amps
maximum and are energized during blower motor operation.
(See Fig. 32.)
2. Humidifier (HUM)
Connect an accessory 24 VAC, 0.5 amp maximum humidifier
(if used) to the 1/4-in. male quick-connect HUM terminal and
C
OM-24V screw terminal on the control board thermostat strip.
The HUM terminal is energized when blower is energized in
heating. (See Fig. 32.)
DO NOT connect furnace control HUM terminal to HUM
(humidifier) terminal on Thermidistat™, Zone Controller or
similar device. See Thermidistat™, Zone Controller, thermo-
stat, or controller manufacturer’s instructions for proper
connection.
Step 9—Direct Venting
The 58MVP furnaces require a dedicated (one 58MVP furnace
only) direct-vent system. In a direct-vent system, all air for
combustion is taken directly from outdoor atmosphere, and all flue
gases are discharged to outdoor atmosphere.
REMOVAL OF EXISTING FURNACES FROM
COMMON VENT SYSTEMS
When an existing Category I furnace is removed or replaced, the
original venting system may no longer be sized to properly vent
the remaining 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, etc.
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/NFPA 54 or the CSA B149.1, Natural Gas and
Propane Installation Code and these instructions. Deter-
mine 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 appli-
ance(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 operat-
ing 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 and/or CSA B149.1, Natural Gas and Propane Instal-
lation Code.
9. After it has been determined that each appliance con-
nected to the venting system properly vents when tested
as outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas-fired burning appli-
ance to their previous conditions of use.
Vent system or vent connectors may need to be resized. For any
other appliances when resizing vent systems or vent connectors,
system or connector must be sized to approach minimum size as
determined using appropriate vent sizing table found in the NFGC
or NSCNGPIC.
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