1083292-UIM-A-0114
Johnson Controls Unitary Products
21
ACCESSORY CONNECTIONS
The furnace control will allow power-switching control of various acces-
sories.
ELECTRONIC AIR CLEANER CONNECTION
Two 1/4” (6.4 mm) spade terminals (EAC and NEUTRAL) for electronic
air cleaner connections are located on the control board. The terminals
provide 115 VAC (1.0 amp maximum) during circulating blower opera-
tion.
HUMIDIFIER CONNECTION
Two 1/4” (6.4 mm) spade terminals (HUM and NEUTRAL) for humidifier
connections are located on the control board. The terminals provide 115
VAC (1.0 amp 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 read.
HUMIDISTAT CONNECTION
For better humidity control during cooling operation, an external humidi-
stat may be used. When using a external humidistat, put the HUMIDI-
STAT jumper in the YES position. Connect the low voltage wiring as
shown in Figures 22-27.
ZONING OPERATION
This furnace may be used in zoning systems, using a separate after-
market zoning control. For use in zoned systems, put the ZONE CON-
TROL jumper on the furnace control board in the “YES” position.
If the Zone jumper is put in the “Yes” position, the heating load logic
switches to a special algorithm for multi-zone homes.
1.
This algorithm operates at the “low demand” firing rate for 10 min-
utes and then ramps to high fire within 20 minutes (30 minutes
maximum to get to 100% firing rate).
2.
The special zoning algorithm does not have the Run 2 function, so
the burners will stop firing as soon as there is no call for heating.
HEAT PUMP OPERATION
This furnace may be used in conjunction with a heat pump in dual fuel
applications. For heat pump applications, put the HEAT PUMP jumper
on the furnace control board in the “YES” position. Connect the low volt-
age wiring as shown in Figures 25-27, Thermostat Charts. If a two-
stage heat pump is to be used, a two-stage thermostat is required.
If the Heat Pump jumper is in the “YES” position, it indicates that there
is a heat pump present and the furnace is used as a secondary heat
source. In addition, the “YES” Heat Pump jumper allows the system to
read the presence of the “O” terminal signal. In heat pump operation,
the following special algorithm logic applies:
1.
Supplemental Heating
-
When both a “W” signal and a “Y1” signal
are present, the modulating firing rate will operate as normal,
except there will be no Run 2 function, so the burners will stop fir-
ing as soon as the “W” signal is removed.
2.
Defrost Cycle - When both a “W” signal and a “Y2” signal are pres-
ent, the modulating firing rate will operate at a constant 80% firing
rate and there will be no Run 2 function, so the burners will stop fir-
ing as soon as the “W” signal is removed.
3.
Hot Heat Pump - The “hot” heat pump feature will work when the
control is wired to a 2-stage thermostat and a 2-stage heat pump.
4.
Hot Heat Pump - The “hot” heat pump feature will not work when
the control is wired to a single-stage thermostat and a 2-stage heat
pump.
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 LOCATION
As shipped from the factory:
•
For all 060 & 080K input furnaces the main drain is plumbed
through the casing right-side opening when viewed from the front
of the furnace.
•
For all 100, 120K input furnaces the main drain is plumbed
through the casing left-side opening when viewed from the front
of the furnace.
The Figures 29-32 show the condensate drain arrangement for the var-
ious possible furnace and vent blower positions.
The condensate hoses must slope downwards at all points.
The condensate water will flow to the drain better if an open tee, or
short length of pipe is installed in the drain line.
When drain hose routing changes are required (shown in Figures 29-
32), be sure to cap all un-used openings.
If rerouting hoses - excess length should be cut off so that no sagging
loops will collect and hold condensate - which will cause the furnace to
not operate.
No hose clamps are needed for connecting the condensate pan.
The furnace condensate pan is self priming and contains
an internal trap to prevent flue gas leaking. Do not install an
external condensate trap.
The furnace, evaporator coil, and humidifier drains may be com-
bined and drained together. The evaporator coil drain may have an
external, field-supplied trap prior to the furnace drain connection to
prevent conditioned air leakage. All drain connections (furnace,
evaporator coil, or humidifier) must be terminated into an open or
vented drain as close to the respective equipment as possible.
Regular maintenance is required on condensate drainage system.
Condensate must be disposed of properly. Follow local plumbing
or wastewater codes. The drain line must maintain a 1/4" per foot
(21 mm/m) downward slope to the drain.
If an external vent tee is being installed, then it must have its own
condensate trap before it is disposed into an open or vented drain.
This is not to be considered as a second trap as referenced
elsewhere in this document.
