1. New Low Capacity Gas Furnace

2. Current Situation
Multi-family homes is the fastest growing HVAC market
Current installations are grossly oversized
Existing sizes cause
Nuisance pressure switch tripping
Cycle-related short run times cause vents to freeze

3. Solution-ICP Low capacity gas furnaces
2 new 26,000 BTUH input
Single stage ¼-hp w/PSC blower motor (N9MSE)
Single stage 1/3-hp w/ Multi-Tap ECM blower motor (F/G9MXE)
To serve new construction markets in
Apartment
Multi-family
Low Energy homes

4. ICP® New Low Capacity Models
N9MSE A2
F(G)9MXE A2
95% AFUE
2 tons nominal cooling
in. W.C.
675 nominal heating CFM
1/4 HP PSC blower motor (new)
4 speed taps
2 burner/2 cell heat exchanger
13,000 btuh per burner
14 3/16-in. casing
95% AFUE
2 ½ tons nominal cooling
in. W.C.
605 nominal heating CFM
1/3 HP Multi-Tap ECM blower motor (new)
5 speed taps
2 burner/2 cell heat exchanger
13,000 btuh per burner
14 3/16-in. casing

5. Installation Similarities
Current to 4-way multipoise 90%furnaces
Footprint
Location requirements
Duct connections
Electrical requirements
15 amp circuit/14ga. wire
Gas piping requirements
Vent requirements
New table for 26K models
Condensate connections

6. Major Differences Inducer Choke Pressure Switches
Multi-hole design
Pressure Switches
New set points
Gas Valve & Manifold Pressure
Lower set point & operating range
2-pipe venting
Not considered “Direct Vent”
Can be single pipe or VCA option
Dedicated Conversion Kits
Not approved for Mobile Home use

7. Inducer Inlet Choke 3-hole design Hole I.D. is 9.7 mm (3/8-in.)
Same overall OD as other chokes
Inducer service kit
Single stage
Includes inlet choke
No outlet choke required

8. Pressure Switches Inducer Housing Pressure Switch
Square tube
Faces backward
Max Make
0.25-in. W.C.
Min Break
0.10-in. W.C.
Collector Box Pressure Switch
Round tube
Faces forward

9. Gas Valve Uses a unique Low Capacity regulator spring
Lower natural gas manifold pressure range
1.3-in. W.C. to 1.8-in. W.C.
Lower propane manifold pressure
5.5-in. W.C.
Certified for this model only
Special color label
Note the nominal regulator setting of 1.5-in. W.C.

10. ¼ HP PSC Blower Motor 4 speed taps As shipped: 25 µF 370 VAC capacitor
Black (high)
Yellow (medium high)
Blue (medium low)
Red (low)
As shipped:
Black (cooling)
Blue (heating)
Yellow (spare)
Red (spare)
25 µF 370 VAC capacitor
2 Brown leads

11. 1/3 HP Multi-Tap Blower Motor
5 speed taps
Grey (high)
Yellow (medium high)
Orange (medium)
Blue (medium low
Red (low)
Green (common)
As shipped:
Grey (cooling)
Blue (heating)
Red (continuous fan)
Yellow (spare)
Orange (spare)

12. Max length (before deductions)
Venting
3 options
2-pipe
Single pipe
Ventilated Combustion Air
Max length (before deductions)
1 ½-in., 70 ft ft.
2-in., 200 ft ft.
Approved for ULC S636 pipe (Canada)

13. Pipe Diameter (inches)
Vent Tables
Input
Altitude (feet)
Pipe Diameter (inches)
1 ½-in.
2-in.
2 ½-in.
3-in.
4-in.
26,000 BTUH Only
0-2000 70
200 NP
2001 to 3000 65
190
3001 to 4000 60
175
4001 to 4500 55
160
4501 to 5000
5001 to 6000 50
145
6001 to 7000 45
135
7001 to 8000 40
120
8001 to 9000 35
110
9001 to 10,000 30 95
NP means Not Permitted

14. Alberta/Saskatchewan clearances may not apply
Terminations
2-in Concentric
3-in not recommend
Standard 2-pipe
Standard single pipe
Alberta/Saskatchewan clearances may not apply
Input less than 35,000 BTUH
Final ruling required
You must verify code requirements with the authority having local jurisdiction

15. Similar to current products Same minimum inlet gas pressures
Start-up
Similar to current products
Same minimum inlet gas pressures
4.5-in. W.C. for natural gas
12.0-in. W.C. for propane
Manifold pressure ranges are lower
1.3-in. to 1.8-in. W.C. for natural gas
#44 orifices (0 to 2000 ft.)
5.5-in. to 5.2-in. W.C. for propane
1.25 mm orifices (0 to 10,000 ft.)

16. Startup-Check Inlet Gas Pressure
Remove the inlet pressure tap plug (3/16-in. hex wrench)
Install manometer fitting & manometer
Install inlet pressure tap plug after checking inlet gas pressure.

17. Startup-Check Inlet Gas Pressure
With manometer connected to inlet pressure tap:
Turn gas supply ON
Verify inlet gas pressure above 4.5-in. W.C. (natural gas)
Set furnace to call for heat
After ignition
Verify inlet gas pressure does not drop below 4.5-in. W.C.
Do not operate the furnace for more than about a minute
After checking the inlet pressure
Remove manometer
Install the 1/8-in. pipe plug in the gas valve

18. Startup-Check Manifold Pressure
Remove the outlet pressure tap plug (3/16-in. hex wrench)
Install manometer fitting & manometer
Install outlet pressure tap plug after checking manifold pressure.

19. Startup-Adjust Manifold Pressure
With manometer connected to outlet pressure tap:
Set furnace to call for heat
After ignition and the burner stabilizes
The manifold pressure range for natural gas:
1.3-in. W.C. to 1.8-in. W.C. (Refer to table in installation instructions)
To adjust the manifold pressure
Remove cap that conceals gas valve regulator adjustment
screw
Turn adjusting screw
counterclockwise (out) to decrease manifold pressure
clockwise (in) to increase manifold pressure
Replace gas valve regulator seal cap
Verify manifold pressure is correct

20. Startup-Adjust Manifold Pressure
After adjusting the manifold pressure
Terminate the call for heat
Turn gas off/gas valve switch to OFF/power off
Remove the manometer
Install the 1/8-in. pipe plug in the outlet tap of the gas valve
Turn furnace gas on/valve switch ON/power on
Set room thermostat to call for heat
Check pressure tap plug for gas leaks when main burners ignite
Check for correct burner flame.
Observe unit operation through 2 complete heating cycles

21. Check Temperature Rise
Blower door must be installed when taking temperature rise reading
Leaving blower door off affects temperature measurements
Changes the duct static pressure and airflow
This furnace must operate within the temperature rise ranges specified on the furnace rating plate

22. Temperature Rise Information
25-55
14-31
Temperature Rise
Minimum
Mid-Point
Maximum
Fahrenheit
25°
40°
55°
Celsius
14°
22°
31°
Min/Max temperature rise is shown on the unit rating plate. Mid-point of the rise range (shown above) is the ideal rise range point

23. Check Temperature Rise
Determine the air temperature as follows:
Place thermometers in return and supply ducts
As close to furnace as possible
Away from line-of-sight of the heat exchanger
When thermometer readings stabilize
Subtract return air temperature from supply air temperature to determine temperature rise

24. Adjust Temperature Rise
Adjust blower speed to change temperature rise
Increase blower speed to reduce temperature rise
Decrease blower speed to increase temperature rise
Change blower speeds at control board

25. Blower Speed Tap Locations
PSC Models
Neutral (white) to 3/16” L2 terminal marked “BLW”
Speed taps to ¼” spade terminals on top of relay
Unused taps to ¼” spade terminals labeled “Spare” on edge of control board

26. Blower Speed Tap Locations
PSC models
115 VAC motor speed taps connect to the terminals on the relay. “COOL” & “HEAT” are marked on control board (red box).
Motor neutral (white) connects to the 3/16 terminal marked “BLW” at the Neutral block (yellow box)
Spare terminals connect to spade terminals on the edge of the control board (blue box)

27. Blower Speed Tap Locations
Tap Select ECM models
24 VAC speed taps to 24V MTR TAPS
Green wire to COM
Neutral (white) to L2 block terminals
115 VAC (black) to terminal BL-1

28. Blower Speed Tap Locations
Tap Select ECM models
24 VAC motor speed taps connect to the terminals on the furnace control board

29. Blower Speed Tap Locations
Tap Select ECM models
115 VAC motor lead (black) connect to BL-1
Motor Neutral lead (white) connects to Neutral-L2

30. Condensate drain connected? Accessories installed?
Other Tasks
Filter installed?
Filter(s) are external to the casing
Condensate drain connected?
Check for condensate drainage
Accessories installed?
Gas piping checked for leaks?
Installation book left with furnace?
Supply registers open/return grills not blocked?
Outer doors installed?

31. Conversion to Propane NAHA01201LP includes: 1.25 mm orifices
Regulator spring
Spare spring-Regulator spring change not required
Mixer screws with drill bit
Low Gas Pressure Switch
Brass fittings
Wires
Conversion Labels

32. Remove the manifold NOTE: Use a back−up wrench on the gas valve
Prevent the valve from rotating on the manifold or damaging the mounting to the burner box
Disconnect the gas pipe from gas valve and remove pipe from the furnace casing
Disconnect:
Wires from gas valve
Hot Surface Igniter
Flame Sensor
Support the manifold and remove the four (4) screws that secure the manifold assembly to the burner box and set aside.
Note the location of the green/yellow wire ground wire for re−assembly later

33. Remove the burner
Slide one−piece burner assembly out of slots on sides of burner box
Remove the flame sensor from the burner assembly

34. Remove the natural gas orifices
Remove the #44 orifices
Discard orifices

35. Install the orifices Inspect the 1.25 mm orifice for chips or debris
Install mm orifices
There are enough orifices in each kit for largest furnace
Do not use Teflon® tape or pipe dope
Finger−tighten orifices
At least one full turn to prevent cross−threading,
Tighten with wrench
Discard extra orifices
NOTE: DO NOT reinstall the manifold at this time

36. Pre-Adjust the Gas Valve
Green labeled gas valve ONLY!
DOES NOT need regulator spring replaced
Kit includes an regulator extra spring
Regulator must be pre-adjusted for propane applications
Extra Gas Valve Regulator Spring

37. Pre-Adjust the Gas Valve
Remove the brass cap for the gas−valve regulator
Turn the regulator adjustment screw clockwise 1.5 full turns
This will adjust the valve closer to the propane set point
If the regulator spring is removed
Re-install the spring and the adjustment screw
Turn the adjusting screw clockwise (in) 11.5 full turns
This will increase the manifold pressure closer to the propane set point
Do not install the brass regulator seal caps at this time
Pre-adjust the regulator by turning the adjustment screw clockwise 1.5 full turns

38. Install Low Gas Pressure Switch
NOTE: Install the Low Gas Pressure Switch before installing the manifold on the burner assembly
Remove the 1/8-in. NPT pipe plug from the gas valve inlet pressure tap
Do not discard plug
NOTE: Use pipe dope approved for use with Propane Gas

39. Install Low Gas Pressure Switch
Necessary fittings are supplied in the kit
There are extra fittings in the kit
LGPS is included it the kit
CONTACTS OPEN ON PRESSURE FALL AT 7.20” W.C. +/- 0.70” W.C.
CONTACT CLOSE ON INCREASING PRESSURE NO MORE THAN 10.20” W.C.

40. LGPS Fittings Black iron street ell Male x Female x Female Tee
Male into inlet tap
Points outward
Male x Female x Female Tee
Male end into street ell
Female ends point
Outward
To your left
Brass hex nipple
Inserts into tee
Brass Street ell
Connects to hex nipple
Male end connects to LGPS 1 2 3 4
Manometer connection. Install inlet pressure tap plug after checking inlet gas pressure.

41. Install Low Gas Pressure Switch
Use pipe dope sparingly
Install:
Black iron street ell
F x M x F Tee
Open end of Tee points outward
Connect inlet manometer fitting
Brass hex nipple
Brass street ell
Tighten each fitting with a small wrench
Install LGPS
Tighten with a small wrench
Terminals point outward
If unit is to be started at a later date, install plug removed from inlet pressure tap and install in place of manometer fitting

42. LGPS Pressure Switch Wires
There are 2 orange wires in the kit
The straight terminals (1) connect to the LGPS
The male spade terminal (2) connects to the orange wire of the low pressure switch harness
The flag terminal (3) connects to the terminal on the low pressure switch 2 1 3

43. LGPS Pressure Switch Wires
Before installing the manifold
Connect the straight terminal from each orange wires to each terminals on the switch

44. Install the Mixer Screws
Use only the parts in the bag marked:
“REQUIRED FOR THE CONVERSION OF CONDENSING GAS FURNACES TO PROPANE GAS”
Locate the dimple on each burner venturi tube.
If you cannot locate the dimple
Refer to Figure in the instructions for the location of the mixer screw

45. Install the Mixer Screws
Use only the parts in the bag marked:
“REQUIRED FOR THE CONVERSION OF CONDENSING GAS FURNACES TO PROPANE GAS”
Bag includes:
7/64th drill bit
(7) Mixer screws

46. Install the Mixer Screws
Drill a 7/64−in (2.8 mm) hole in each dimple
Install a mixer screw in each drilled hole
As straight as possible
Perpendicular to the gas flow stream
The screw head should be flush with the top of the burner venturi

47. Install the Mixer Screws
Install a mixer screws
As straight as possible
perpendicular to the gas flow stream
The screw head should be flush with the top of the burner venturi

48. Re-assemble Burner Note the notch on front corner of burner
Burner slides in slots in burner box
Slide burner forward
Notched area should be fully seated forward

49. Install Manifold Insert manifold Install the 4 mounting screws
Verify orifices are captured by the burner mounting rings
Install the 4 mounting screws
Re-connect:
Green ground wire
HSI
Flame Sensor
Route HSI harness OVER manifold
Route Flame Sensor harness UNDER manifold

50. Modify Pressure Switch Wiring
Route the LGPS wires down to the LPS
Disconnect the orange wire from the LPS (1)
Connect the flag terminal (2) to the terminal on the LPS
Connect the male spade terminal (3) to the orange wire (1) removed from the LPS 3 1 2

51. Modify Pressure Switch Wiring
Flag terminal (2) connected to the terminal on the LPS
Male spade terminal (3) connected to the orange wire (1) removed from the LPS
Secure wires with wire tie included in the kit 3 1 2

52. Startup-Check Inlet Gas Pressure
With manometer connected to inlet pressure tap:
Turn gas supply ON
Verify inlet gas pressure above 12.0-in. W.C. (propane)
Set furnace to call for heat
After ignition
Verify inlet gas pressure does not drop below 12.0-in. W.C.
Do not operate the furnace for more than about a minute
After checking the inlet pressure
Terminate the call for heat
Remove the manometer
Install the 1/8-in. pipe plug in the brass tee

53. Startup-Check Inlet Gas Pressure
Install inlet pressure tap plug after checking manifold pressure
Manometer connection at LGPS

54. Startup-Adjust Manifold Pressure
With manometer connected to outlet pressure tap:
Set furnace to call for heat
After ignition and the burner stabilizes
Verify the manifold pressure (see conversion rating plate)
To adjust the manifold pressure
Remove cap that conceals gas valve regulator adjustment
screw
Turn adjusting screw
counterclockwise (out) to decrease manifold pressure
clockwise (in) to increase manifold pressure
Replace gas valve regulator seal cap
Verify manifold pressure is correct

55. Startup-Adjust Manifold Pressure
After adjusting the manifold pressure
Terminate the call for heat
Turn gas off/gas valve switch to OFF/power off
Remove the manometer
Install the 1/8-in. pipe plug in the outlet tap of the gas valve
Turn furnace gas on/valve switch ON/power on
Set room thermostat to call for heat
Check pressure tap plug for gas leaks when main burners ignite
Check for correct burner flame
Observe unit operation through 2 complete heating cycles

56. Startup-Check Manifold Pressure
Remove the outlet pressure tap plug (3/16-in. hex wrench)
Install manometer fitting & manometer
Install outlet pressure tap plug after checking manifold pressure

57. Check Temperature Rise
Blower door must be installed when taking temperature rise reading
Leaving blower door off affects temperature measurements
Changes the duct static pressure and airflow
This furnace must operate within the temperature rise ranges specified on the furnace rating plate

58. Temperature Rise Information
25-55
14-31
Temperature Rise
Minimum
Mid-Point
Maximum
Fahrenheit
25°
40°
55°
Celsius
14°
22°
31°
Min/Max temperature rise is shown on the unit rating plate. Mid-point of the rise range (shown above) is the ideal rise range point.

59. Check Temperature Rise
Determine the air temperature as follows:
Place thermometers in return and supply ducts
As close to furnace as possible
Away from line-of-sight of the heat exchanger
When thermometer readings stabilize
Subtract return air temperature from supply air temperature to determine temperature rise

60. Adjust Temperature Rise
Adjust blower speed to change temperature rise
Increase blower speed to reduce temperature rise
Decrease blower speed to increase temperature rise
Change blower speeds at control board

61. Blower Speed Tap Locations
PSC Models

62. Blower Speed Tap Locations
Tap Select ECM models
24 VAC speed taps to 24V MTR TAPS
Green wire to COM
Neutral (white) to L2 block terminals
115 VAC (black) to terminal BL-1

63. Blower Speed Tap Locations
Tap Select ECM models
24 VAC motor speed taps connect to the terminals on the furnace control board

64. Blower Speed Tap Locations
Tap Select ECM models
115 VAC motor lead (black) connect to BL-1
Motor Neutral lead (white) connects to Neutral-L2

65. Apply Labels-English Apply to inside of door Note label shows:
Model number
Orifice size (1.25 mm)
Manifold pressure (4.5-in. W.C.)

66. Apply Labels-French Apply to inside of door Note label shows:
Model number
Orifice size (1.25 mm)
Manifold pressure

67. Apply Labels-French/English
Apply to inside of door
Fill in:
Date conversion was performed
Company name
Company address

68. Apply Labels-French/English
Apply to gas valve
Shown larger than actual size

69. Operate the furnace through 2 heating cycles
Before You Leave
Operate the furnace through 2 heating cycles
Verify gas and electric are still on
Perform final gas leak check
Final inspections of installation
Including accessories and filter installed
Install outer doors
Thermostat set correctly