W415-0919 / D / 03.27.13
3
1.0 InTRoDUCTIon
IMPORTANT
:
plEASE READ ThIS mANuAl CAREFully
AND kEEp IN A SAFE plACE FoR FuTuRE
REFERENCE by A SERVICE TEChNICIAN.
This high efficient gas fired two stage condensing furnace is an upflow, downflow, horizontal left and right warm
air furnace suitable for residential and light commercial heating applications with inputs from 45,000 to 120,000
btu/hr.
This high efficient furnace series is CSA certified as a Category IV indirect or direct vent central forced air fur-
nace. When installed as a direct vent furnace, all combustion air is supplied to the furnace burners through the air
intake system.
(See Section 7, “Ventilation and Combustion Piping.”)
All models may be fired by natural or lp gas (propane), and may be field converted from natural gas to lp gas
using Conversion kit W370-0018.
The furnace is shipped completely assembled except for the condensate drain trap assembly. please inspect
for damage when the furnace is unpacked.
NOTE: Changes, other than editorial, are denoted by a vertical line in the margin.
15.0
LOW vOLTAGE WIRING
42
15.1
SINglE STAgE ThERmoSTAT
42
15.2
TWo STAgE ThERmoSTAT
42
15.3
ThERmoSTAT loCATIoN
42
16.0
OPTIONAL ACCESSORIES (FIELD SUPPLIED/INSTALLED)
43
16.1
ElECTRIC AIR ClEANER
43
16.2
poWER humIDIFIER
43
16.3
EmERgENCy hEAT moDE
43
17.0
STARTUP PROCEDURES
44
17.1
To START ThE FuRNACE
44
17.2
To ShuT DoWN ThE FuRNACE
44
17.3
SEquENCE oF opERATIoN
45
17.4
pRogRAmmAblE ThERmoSTAT (opTIoN)
45
18.0
AIR FLOW
46
18.1
TEmpERATuRE RISE ChECk
46
18.2
CAlCulATINg AIR FloW
47
18.3
ADjuSTINg bloWER SpEEDS oN moDElS EquIppED WITh ECm 2.3 bloWER moToRS
47
18.4
DEhumIDIFICATIoN - ECm 2.3
48
18.5
SETTINg bloWER “oN” AND “oFF” TImINgS - ECm 2.3 moDElS oNly
48
18.6
CoNTINuouS FAN opERATIoN
48
19.0
MAINTENANCE AND TROUBLESHOOTING
49
19.1
AIR FIlTER
49
19.2
lubRICATIoN
49
19.3
TRoublEShooTINg FloWChART
50
19.4
DIAgNoSTIC CoDES FoR STATuS lED
51
19.5
FAulT CoDE hISToRy
51
20.0
WIRE DIAGRAM FOR TWO STAGE FURNACE WITH ECM 2.3
52
21.0
WARRANTY
54
22.0
REPLACEMENT PARTS LIST
55
23.0
SERvICE HISTORY
57
ATTENTION
:
upFloW VENTINg RIghT, muST DRAIN oN
lEFT SIDE.
