For horizontal left airflow (inducer and vent low) or horizontal
right airflow (inducer and vent high), install condensate drain
hoses as follows:
RIGHT AIRFLOW (Inducer High) - Three hoses are required
LEFT AIRFLOW (Inducer Low) - Two hoses are required. Refer
to Table 8 and Figure 30 for hose placement and sizing.
Drain Connection
The following steps apply to all models. For horizontal applica-
tion, also follow the procedure for relocating the trap assembly
and installing drain hoses.
1. It is recommended that either 1/2" or 3/4" PVC or equiva-
lent pipe be field installed as drain pipe. The condensate
piping may be tied together with the air conditioning con-
densate drain if the air conditioning condensate drain line
is trapped upstream of the tie-in and the combined drains
are constructed of the same material.
2. All pipe joints must be cleaned, de-burred and cemented
using PVC primer and cement.
3. The furnace contains an internal trap. Therefore, no exter-
nal trap should be used.
4. If a condensate pump is used, it must be suitable for use
with acidic water.
5. Where required, a field-supplied neutralizer can be in-
stalled in the drain line, external to the furnace.
NOTE: The condensate drain from the furnace may be con-
nected in common with the drain from an air conditioning
coil if allowed by local code. Follow the instructions with
the coil for trapping the drain.
SAFETY CONTROLS
Control Circuit Fuse
A 3 amp. fuse is provided to protect the 24 volt transformer from
overload caused by control circuit wiring errors. This is an ATO
3, automotive type fuse and is located in the unit wiring harness
between the control transformer and the furnace control.
Blower Door Safety Switch
This unit is equipped with an Electrical Interlock Switch
mounted in the blower compartment. This switch interrupts all
power at the unit when the panel covering the blower compart-
ment is removed.
5
4
D
4 - I N D U C E R O U T L E T T O T R A P
U S E A S P R O V I D E D
5 - C O N D E N S A T E P A N T O T R A P
" D " D I M E N S I O N
L E F T A I R F L O W
( I N D U C E R L O W )
H O S E
I D E N T .
N U M B E R S
1
2
3
R I G H T A I R F L O W
( I N D U C E R H I G H )
A
B
C
1 - C O N D E N S A T E P A N T O T R A P
" A " D I M E N S I O N
2 - I N D U C E R B O T T O M T O T R A P
" B " D I M E N S I O N
3 - I N D U C E R O U T L E T T O T R A P
" C " D I M E N S I O N
H O S E
I D E N T .
N U M B E R S
DIMEN.
CABINET SIZE (IN.)
RIGHT AIRFLOW (INDUCER HIGH)
14-1/2
17-1/2
21
24-1/2
A
4-1/2
4-3/4
3-1/2
5-1/4
B
7-1/2
10-1/2
14
17-1/2
C
13-1/2
16-1/2
20
23-1/2
LEFT AIRFLOW (INDUCER LOW)
D
3-3/8
3-1/4
3-1/4
3-1/4
CAUTION: Plug all unused condensate trap, condensate pan
and inducer drain connection points using plugs provided.
FIGURE 30 - HORIZONTAL APPLICATION CONDENSATE DRAIN CONNECTION
TABLE 8 - HORIZONTAL CONDENSATE
DRAIN HOSE SIZES
650.75-N4U
Unitary Products Group
19
