17
Table 7 – 374RAN105 Dip Switch Adjustment for Oil Heating
Mode
SW1---HEAT DIP SWITCH
POSITION
INPUT
USGPH
SW4---DELAY DIP
SWITCH POSITION
INPUT
USGPH
1
2
1
2
Off
Off
0.75
Off
Off
0.75
On
Off
0.65
On
Off
0.65
Off
On
0.5
Off
On
0.5
On
On
N/A
On
On
NA
Table 8 – 374RAN105 Size Dip Switch Adjustments for Heat
Pump and Cooling Mode
SW2---COOL DIP SWITCH POSITION
A/C SIZE (TONS)
1
2
Off
Off
3.0
On
Off
2.5
Off
On
2.0
On
On
1.5
Table 9 – 374RAN105 Size Dip Switch CFM Adjustments in
All Modes
SW3---ADJUST DIP SWITCH
POSITION
HEATING CFM %
INCREASE OR
DECREASE
COOLING CFM %
INCREASE OR
DECREASE
1
2
Off
Off
0
0
On
Off
+13
+10
Off
On
---15
---10
On
On
N/A
0
Table 10 – 374RAN120 Size Dip Switch Adjustment for Oil
Heating Mode
SW1---HEAT DIP SWITCH
POSITION
INPUT
USGPH
SW4---DELAY DIP
SWITCH POSITION
INPUT
USGPH
1
2
1
2
Off
Off
0.85
Off
Off
0.85
On
Off
1.00
On
Off
1.0
Off
On
1.10
Off
On
1.10
On
On
N/A
On
On
NA
Table 11 – 374RAN120 Size Dip Switch Adjustments for Heat
Pump and Cooling Mode
SW2---COOL DIP SWITCH POSITION
A/C SIZE (TONS)
1
2
Off
Off
5.0
On
Off
4.0
Off
On
3.5
On
On
3.0
Table 12 – 374RAN120 Size Dip Switch CFM Adjustments in
All Modes
SW3---ADJUST DIP SWITCH
POSITION
HEATING CFM %
INCREASE OR
DECREASE
COOLING CFM %
INCREASE OR
DECREASE
1
2
Off
Off
0
0
On
Off
+13
+10
Off
On
---15
---10
On
On
N/A
0
FIRE HAZARD AND UNIT RELIABILITY
Failure to follow this warning could result in property
damage, personal injury, or death.
When operating furnace in heating mode, static pressure
and temperature rise (supply--air temperature minus
return--air temperature) must be within those limits specified
on rating label.
!
WARNING
Step 5 — Limit--Control Check
After furnace has been in operation for at least 15 minutes, restrict
return--air supply by blocking filters or closing return registers and
allow furnace to shut down on high limit. The burner should shut
off and main blower should continue to run.
Step 6 — For Year--Round Air Conditioning
This furnace is designed for use in conjunction with cooling
equipment to provide year--round air conditioning. The blower has
been sized for both heating and cooling, however fan--motor
setting may need to be changed to obtain necessary cooling
airflow.
CARE AND MAINTENANCE
ELECTRICAL SHOCK, FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death and/or property damage.
The ability to properly perform maintenance on this equipment
requires certain expertise, mechanical skills, tools, and
equipment.
If you do not possess these, do not attempt to
perform any maintenance on this equipment other than those
procedures recommended in the User’s Manual.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before performing any service functions, unless operations
specifically require power to be on, make sure all utilities
are turned off upstream of appliance.
!
WARNING
Step 1 — General
In order to keep this furnace in good operating condition and to
maintain its warranty, the furnace MUST be serviced on an annual
basis. This servicing includes a nozzle change, a burner inspection,
a visual check of tube passages through flue outlet and clean--out
ports, and a visual inspection of combustion chamber when burner
is removed.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
Failure to replace any heat exchanger gaskets with new
gaskets when any heat exchanger plates or covers are
removed could lead to heat exchanger leakage or sooting.
!
WARNING
374RAN
