Operator`s manual

Operator's Manual: Models CB-1500 & CB-2500 (230 V / 50 Hz)
3-6
IMPORTANT NOTE: It is essential that qualified HVAC personnel properly design the ductwork
for your furnace and determine the static pressure for your ducting application. Note that existing
ductwork at your installation site may not be appropriate or meet the specifications for this
furnace installation. For static pressure readings as shown in the chart above, the ductwork
should be installed directly over the opening in the SIDE of the furnace cabinet (i.e. where the
louver panels would be installed for free air applications.) For Central Furnace applications,
ductwork may NOT be installed over the bottom opening.
Determining the Hot Air Discharge Configuration (continued)
Air Flow - Cubic Meters per Minute (CMM) or Cubic Feet per Minute (CFM)
and Static Pressure (SP) Specifications
*ATTENTION: A qualified electrician must check the blower motor amperage during operation of the furnace to ensure that
motor amperage does not exceed 85% of the maximum amperage on the motor label. DO NOT operate the blower motor above
85% of maximum amperage or motor damage may occur.
Installing the Hot Air Discharge Components
It is very important to properly install the hot air discharge components (louvers and blank cover panels) to
direct the flow of air from the furnace. As you will note from Figures 3D and 3E, the air discharge panels are to
be installed on the side(s) and/or bottom of the furnace. The air flow may be directed down, front, or back
depending on how the louvers and cover panels are installed.
IMPORTANT NOTE FOR CENTRAL FURNACE APPLICATIONS:
• For ducting applications with static pressure, DO NOT install the louvers. The ductwork should
be installed directly over the desired air discharge opening on the side of the furnace cabinet.
CB-1500 opening in side shrouding for ductwork - 305 mm x 305 mm (12" x 12")
NO changes need to be made for the shrouding outlet size
CB-2500 opening in side shrouding for ductwork - 395 mm x 395 mm (15 1/2" x 15 1/2")
Install new inner shield and outside shrouding with larger opening sizes
• Ductwork must be installed over side opening(s) ONLY. Ductwork may NOT be installed over
the bottom air discharge opening.
Air Discharge Louvers
Mounted on Furnace
Free Air*
0.06 kPa*
(0.25 INCHES WC)
40 CMM
(1400 CFM)
34 CMM
(1200 CFM)
Air Discharge Louvers Removed
With Ductwork Installed on Furnace
CB-1500
CB-2500
Air Discharge Louvers
Mounted on Furnace
Free Air*
71 CMM
(2500 CFM)
Air Discharge Louvers Removed
With Ductwork Installed on Furnace
0.06 kPa*
(0.25 INCHES WC)
68 CMM
(2400 CFM)
Air Discharge Louvers Removed
With Ductwork Installed on Furnace
0.10 kPa*
(0.40 INCHES WC)
64 CMM
(2250 CFM)