Dettson OMF154L20A, Installation Instructions And Homeowner'S Manual

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2.2.2 Upflow Installation 

 
When the furnace is installed in the downflow position on a 
combustible floor, the clearances from combustibles must 
be adhered to. The downflow base DFB-104 or 
KLASB1001DET can be used to ensure these clearances. 
Refer to  figure 3 and the installation instructions provided 
with the base. 

The burner must always be installed in the same manner, 
regardless of the discharge position of the furnace. Refer 
to figure 3 for additional details. 
 

Figure 3  -   Downflow Installation 

1.3.5 

Horizontal 

Installation 

When the furnace is installed in the horizontal position, 
either suspended or on a combustible floor with a choice of 
right or left discharge, the clearances from combustible 
material must be adhered to. If the unit is installed on a 
combustible floor, the horizontal floor base HFB-101 or 
KLASB0701DET can be used to ensure these clearances. 
Refer to the instructions supplied with the base. 

The burner must always be installed in the same manner, 
regardless of the discharge position of the furnace. Refer 
to figure 4 for additional details. 
 

Figure 4  -   Horizontal Installation 

2.3 ELECTRICAL

SYSTEM 

CAUTION 

The exterior of the unit must have an uninterrupted 
ground to minimize the risk of bodily harm, if ever an 
electrical problem develops. A green ground screw is 
supplied with the control box for that purpose.

The appliance must be installed in accordance with the 
current ANSI/NFPA 70 National Electrical Code, CSA 
C22.1 Canadian Electrical Code Part 1 and/or local 
codes. 

The control system depends on the correct polarity of 
the power supply. Connect “HOT” wire (H) and 
“NEUTRAL” wire (N) as shown in figures 10 and 11. 

A separate line voltage supply should be used, with 
fused disconnect switch or circuit breaker, between the 
main power panel and the unit. 

Only copper wire may be used for the 115V circuit on 
this unit. If wires need to be changed, the replacements 
must have the same temperature resistance as the 
originals. 
 

2.4 INSTALLATION

OF

THE

THERMOSTAT 

A thermostat must be installed to control the 
temperature of the area to be heated. Follow the 
instructions supplied with the thermostat. Also refer to 
the wiring diagrams provided with the heating/air 
conditioning unit. The connections must be made as 
indicated on the following diagrams and the wiring 
diagrams, figures 10 and 11. 

Figure 5  -   Thermostat wiring, heating and air 

conditioning with 4-speed motor 

Filter 24 x 24 

Downflow base is 
required for 
combustible floor 

Burner position 

DNS-1227A 

Horizontal floor base 
required for combustible 

Burner position 

Filter 24 x 24 

DNS-1227A