Condensate Piping And Furnace Venting Configuration; Accessory Connections; Typical. Condensate Drain, Vertical Installation - Johnson Controls MG9S*MP Installation Manual

ACCESSORY CONNECTIONS

The furnace control will allow power-switching control of various acces-
sories. Refer to Figure 19, for connection details.
HUM. HOT
BLK
115 VOLT
WHT
HUMIDIFER
EAC HOT
115 VOLT
BLK
ELECTRONIC
WHT
AIR CLEANER
FIGURE 19: Accessory Connections
ELECTRONIC AIR CLEANER CONNECTION
Two 1/4" (0.64 cm) 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" (0.64 cm) spade terminals (HUM and NEUTRAL) for humidi-
fier 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 required.
SECTION VI: CONDENSATE PIPING AND
FURNACE VENTING CONFIGURATION
CONDENSATE DRAIN LOCATION
As shipped from the factory:
• For all 040, 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, 120, & 130K input furnaces the main drain is plumbed
through the casing left-side opening when viewed from the front
of the furnace.
NOTICE
The Figures 22 - 23 show the condensate drain arrangement for the
various possible furnace and vent blower positions.
The condensate hoses must slope downwards at all points.
The furnace condensate pan is self priming and contains an internal
trap to prevent flue gas leaking. Do not install an external conden-
sate trap.
When drain hose routing changes are required (shown in Figures 22-
23), 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 to the condensate pan.
Johnson Controls Unitary Products
EAC
SWITCHED
HUM CIRCUITS
NEUTRALS
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
(20 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.
FIGURE 20: Typical. Condensate drain, vertical installation
The condensate will flow to the drain better if an open stand pipe is
installed in the drain line. See Figure 20.
If evaporator coil or humidifier drains are combined with the furnace
drain, then the open stand pipe could be raised higher, above the 5"
minimum.
NOTICE
A loop has been added to the pressure switch vacuum hose. How-
ever, ensure that all pressure switch hoses are routed such that
they prevent any condensate from entering the pressure switch.
420705-UIM-C-0310
Open Stand Pipe
(Anti-s iphon air vent)
5" Min.
Tee
To Open Or
Vented Drain
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