Single Stage Multi Position Furnace
Service
Manual
18
440 08 2001 02
Figure 26 (Transition Assembly)
25--23--62
NOTE: The vent fitting MUST be installed with the airflow marking
arrow pointed toward the vent pipe, with the drain stub at a 20°
downward slope.(See Figure 27)
Floats and/or condensate sensors are NOT used in the drain
trap. If the drain line becomes clogged, the condensate level
will rise higher in the external trap. When the level rises suffi-
ciently, the furnace will begin to “Cycle” (On and Off) on the
pressure switch. If the condensate level rises high enough
in the trap, the pressure switch may not close at all, and wa-
ter may be heard “Paddling” inside the combustion blower.
Vent Drain
Connection
Figure 27
Condensate Drain Trap
Drain Line
(hidden)
Transition
Box Drain
25--23--63
Vent Drain
Vent Pipe
(Side panel exit)
NEW
OLD
21. HONEYWELL ST9160B Series FAN TIMER/FURNACE CONTROL
Figure 28
Honeywell ST9160B
Dip
Switch
25--23--63
FUSE
The Honeywell ST9160B Electronic Fan T imer/Furnace
Control contains NO USER SERVICEABLE COM-
PONENTS. It is, as its name implies, a fan timer and a fur-
nace control of sorts. In addition to controlling the fan opera-
tion for heating, it also takes the place of the blower relay, the
combustion air relay and/or the system relay.
The ST9160B is used in models equipped with the SV9541M
GAS VALVE/IGNITION CONTROL. It provides the power
source to begin the ignition sequence through a monitored
safety circuit. It also serves as a low voltage terminal strip.
Accessory terminals for connecting a Humidifier and/or
Electronic Air cleaner are also provided, as well as a Contin-
uous fan terminal which allows for continuous fan operation
at a speed other than either the heating or cooling speed.
The control provides a fixed (non--adjustable) 60 second
“ON” and 60 second “OFF” delay for the circulating blower
in COOLING and a 30 second “ON” delay for the circulating
blower in HEATING.
The ST9160B control also provides an adjustable HEATING
“OFF” delay for the circulating blower which can be field ad-
justed to 60, 100, 140, or 180 seconds.
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