Carrier
Upflow and Downflow Gas-Fired Furnaces
HANG ON WALL NEAR FURNACE
This 58B unit has been approved by the
American Gas Association Laboratories and carries
all required safeguards against fires and accidents.
Such occurrences will take place only if the unit is
mistreated or not properly maintained.
The operation and care of your unit is simple
and easy. By following these operating and main
tenance procedures, you can expect to receive
better, longer, and more reliable service from your
new Carrier appliance.
Here Are a Few "Do's" and "Don'ts"
• Do become familiar with wallcard instructions.
• Do use filters Check them periodically and
make sure that they are clean.
• Don't set your thermostat too low. Ideal
comfort zone is usually between 72 F and 78 F
• Don't be a “thermostat jiggler.” Frequent
changing of your thermostat can increase your
operating costs.
• Don't turn your furnace off just because you’ll
be away for a day or more. It takes quite a
while to restore comfort — but it costs rela
tively little to maintain it.
• Don't block registers with furniture. Don’t put
a lamp, TV or radio too near your thermostat.
This will cause it to give a “false” reading.
Here's How Your Heating System Works
The furnace operates automatically. It is con
trolled by a thermostat which you set at the
temperature most comfortable to you. When the
inside temperature drops below this setting your
thermostat senses this and turns on the system.
First the gas valve opens, and the burners are
lighted by your pilot. After a few moments, the
blower turns on automatically. The air it moves
over the element is warmed and goes on thru the
ducts to room registers.
When the temperature in the room reaches the
thermostat setting, the gas valve closes and the
burners are turned off. The blower continues a few
moments until the heat in the element is used up.
Then it turns off, too.
All forced air furnaces are equipped with high
temperature limit switches (one on most upflow
models, two on other types) that prevent the
furnace from overheating by turning off the
burners if the blower fails to come on. Except on
downflow furnaces, these switches should recycle
automatically, causing the burner to go on and off.
On downflow models, the second of the two
switches used requires manual reset. (Reset button
is on furnace top.)
Here's How You Get Greater Satisfaction
The following steps are very easy to perform.
So before you get ready to light your furnace pilot
make sure that you have gone thru the list.
1. Open all warm air registers and make sure that
all return air grilles are unobstructed.
2. Set room thermostat below room temperature.
3. If a humidifier is installed with your system,
open the water supply valve.
4. If a line voltage switch is provided in the
furnace circuit, make sure that it is turned to
the “Off” position.
5. Make sure that the main burner and pilot
manual gas shutoff valves are closed. “On”and
“Off ” positions are clearly marked.
6. Wait five minutes for unit to be purged of gas,
and then get ready to start the burner.
STARTING YOUR BURNER - Lighting in
structions are also shown on rating plate located on
or near burner compartment door. Should any
doubt exist in your mind concerning proper
lighting procedures, call your gas serviceman to
light unit.
1. After five minute wait for unit to be purged of
gas, turn unit electric switch to “Off.”
2. Open the pilot manual gas shutoff valve.
3. Light the pilot with a match or taper.
NOTE. If your unit is equipped for 100
percent shutoff, it will be necessary to reset
the safety valve before you can relight the
pilot
5. Open the main burner manual gas shutoff valve.
6. Turn the unit electric switch to “On.”
7. Set your thermostat to the desired room
temperature. On heating/cooling systems, set
the system switch to “Heat,” and the fan
switch to “Auto.” or “Cont.” That’s all there is
to it.
OPERATING FAN CONTINUOUSLY (FAN
SWITCH SET ON “CONT”) - Your distribution
system will perform at its best if the furnace fan is
run continuously when weather outdoors is 40 F
or less. This will eliminate cold floors and hot
ceilings and provide for a more constant
temperature.
1. On heating only models, turn the summer
switch (located on the furnace) to the “On”
position.
2. On heating/cooling models, turn the thermostat
fan switch to “Cont.”
3. If your needs are not met by Step 1 or 2, see
your dealer for specific instructions.
©Carrier Corporation 1969
Form 58B-1SO
(10 pages)
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