5894307-UIM-B-0920
Johnson Controls Ducted Systems
11
ACCESSORY CONNECTIONS
The furnace control allows power-switching control of various accesso-
ries.
ELECTRONIC AIR CLEANER CONNECTION
Two 1/4 in. (6.4 mm) spade terminals (EAC and NEUTRAL) for elec-
tronic air cleaner connections are located on the control board. The ter-
minals provide 115 VAC (1.0 A maximum) during circulating blower
operation.
HUMIDIFIER CONNECTION
Two 1/4 in. (6.4 mm) spade terminals (HUM and NEUTRAL) for humidi-
fier connections are located on the control board. The terminals provide
115 VAC (1.0 A maximum) during heating system operation.
A mounting hole is provided on the control panel next to the furnace
control board for mounting a humidifier transformer if required.
TWINNING
These furnaces are not to be twinned. If more than one furnace is
needed in an application, each furnace must have its own complete
duct system and its own wall thermostat.
SECTION VI: CONDENSATE PIPING AND
FURNACE VENTING CONFIGURATION
CONDENSATE DRAIN INSTALLATION
Upflow Installations
The condensate hose inside the furnace is equipped with a straight
male threaded hose adapter. Push the threaded end through the hole in
the casing side and attach the female threaded elbow supplied with the
furnace. Connect the short piece of hose (supplied) and then connect
the condensate trap (supplied). Attach the condensate trap to the side
of the furnace with double-sided tape or by drilling two holes in the cas-
ing side and attaching the trap with No. 8 screws. Attach the short piece
of hose (supplied) to the bottom outlet of the condensate trap. See Fig-
ure 15 for details.
Horizontal Installations
The condensate hose inside the furnace is equipped with a straight
male threaded hose adapter. Remove that adapter and install the male
threaded elbow included with the furnace. Push the threaded end
through the hole in the furnace casing side. Attach short pieces of hose
(supplied) to the top and bottom of the condensate trap (supplied).
Attach the female straight hose adapter (supplied) to the hose con-
nected to the top of the condensate trap. Screw the condensate trap to
the condensate trap bracket (supplied). Then thread the hose adapters
together below the furnace casing, using the threaded connection to
support the condensate trap and bracket. See Figure 15 for details.
All Installations
After connecting the condensate trap as described above, it is neces-
sary to connect the condensate drain line to a suitable disposal system.
This can be rigid PVC pipe, flexible hose, or other suitable material. An
appropriate field-supplied adapter is needed to make the connection
between the condensate trap outlet hose and the final drain line mate-
rial being used.
The condensate hose must slope downwards at all points.
When drain hose routing changes are required, make sure to cap all
unused openings.
If rerouting hoses, cut off excess length so there are no sags or loops
that collect condensate and prevent proper drainage, causing the fur-
nace to not operate.
T
Figure 14:
Thermostat Chart - 1H/2C - Single-Stage Furnace (STD-ECM) - Two-Stage Air Conditioner
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NOTICE
An external condensate trap is required. Failure to install the conden-
sate trap supplied with this furnace will cause operational problems
and could cause flue gas to be emitted into the home.
NOTICE
Figures 15 and 16 show the internal drain arrangement for the vari-
ous possible furnace and drain positions.
IMPORTANT:
The furnace, indoor coil, and humidifier drains can be
combined and drained together. The indoor coil drain can have an
external, field-supplied trap before the furnace drain connection to
prevent conditioned air leakage. All drain connections (furnace,
indoor coil, or humidifier) must be terminated into an open or vented
drain as close to the respective equipment as possible. Regular main-
tenance is required on condensate drainage system.
