International comfort products N9MSE Series, Installation Instructions Manual

INSTALLATION INSTRUCTIONS

Gas Furnace: N9MSE

16

440 01 4103 03

Specifications subject to change without notice.

Horizontal Left Trap Configuration  (CONTINUED)

A11574LB

Rotate elbow to
desired position

and torque clamp
on inlet 15 lb.

−

in.

Slide relief tube in
stand

−

offs to adjust

length.

Attach condensate
trap with screw to 

collector box.

Align trap over middle
and right

−

hand port on

collector box.

Install two plugs previously
removed in open ports on

collector box.

Connect relief tube to port
on collector box.

Connect the new pressure switch
tube from Loose Parts bag to port

on front pressure switch.

Route pressure switch tube
underneath relief tube and

connect to port on 
collector box.

Connect relief tube to relief
port on condensate trap.

9

7

8

NOTE:  Remove knockout in
casing before re

−

installing the 

condensate trap.

Representative drawing only, some models may vary in appearance.

Condensate Drain Connection

!

CAUTION

FROZEN AND BURST WATER PIPE HAZARD

Failure to protect against the risk of freezing may result

in property damage.
Special precautions MUST be made if installing furnace

in an area which may drop below freezing. This can

cause improper operation or damage to equipment. If

furnace environment has the potential of freezing, the

drain trap and drain line must be protected. The use of

accessory drain trap heaters, electric heat tape and/or

RV antifreeze is recommended for these installations.

!

CAUTION

PROPERY DAMAGE HAZARD

Failure to follow this caution may result in burst water

pipes and/or property damage.
If a condensate pump is installed, a plugged condensate

drain or a failed pump may cause the furnace to shut

down. Do not leave the home unattended during freezing

weather without turning off water supply and draining

water pipes  or otherwise protecting against the risk of

frozen pipes.

DO NOT trap the drain line in any other location than at the

condensate drain trap supplied with the furnace. If possible, DO

NOT route the drain line where it may freeze. The drain line

must terminate at an inside drain to prevent freezing of the

condensate and possible property damage.
Special precautions MUST be made if installing furnace in an

area which may drop below freezing. This can cause improper

operation or damage to the equipment. If the furnace

environment has the potential of freezing, the drain trap and

drain line must be protected. A self

−

regulating, shielded and

waterproof heat tape rated at 3 to 6 watt per foot (10 to 20 watt

per meter) at 115 volt, 40

°

 F (4

°

 C) may be used to help provide

freeze protection. Wrap the drain trap and drain line with the

heat tape and secure with appropriate plastic ties. Follow the

heat tape manufacturer’s recommendations. Prime the trap

before furnace operation.
The condensate drain line must be supported and/or secured

per local codes. Supports and clamps should be spaced to

prevent the drain line from sagging or being dislocated from the

furnace or termination point. In the absence of local codes,

consult the edition of the National Standard Plumbing Code

2009, in the US or the National Plumbing Code of Canada

2010 in Canada.

Upflow/Downflow Orientation

In the Upflow or Downflow orientation, the condensate trap is

inside the furnace casing. The condensate drain must be

routed from the trap through the furnace casing. The

condensate drain can be routed through the left or right side of

the casing. (The left or right side is as you are viewing/facing

the furnace from the front.) The furnace condensate drain can

be connected to the indoor coil condensate drain, humidifier or

auxiliary drain traps as shown in 

Figure 12

.

NOTE

:  On narrower casings, it may be easier to remove the

condensate trap, connect the drain line components and

re-install the condensate trap. Read the steps thoroughly to
familiarize yourself with the required steps.

For Right Side Condensate Drain:

1. Remove the 7/8

−

in. knock

−

out from the right side of the

casing. (See 

Figure 13

 for suggested knockout removal

technique.)

2. Remove the pre

−

formed rubber drain elbow and two

spring clamps from the loose parts bag.

3. Slide a spring clamp 1 in. (25 mm) down the plain end

(the end without the formed grommet) of the drain elbow.

4. From inside the casing, insert the formed grommet end

of the elbow through the 7/8

−

in. knockout in the casing.