background image

 

6

 The draft may be accurately 

red with any good draft gauge. 

ractically all installations. Proper, uniform draft 

ator will usually pay for itself in a 

ort time through a substantial savings in fuel costs. 

ney sizes: Gas 

                                                          Draft Hood &  

             Flue Pipe Size 

” 

320,000………………………….. 8” 

……………….. 9” 

…….. 10” 

……………….. 11” 

….. 12” 

…………….. 13” 

00………………………... 14” 

000,001-1,140,000……………………… 15” 

If the flue pipe exceeds 10 ft. in length, or 

2 elbows use next size larger 

C.

 

OIL

   D

install in rooms with insufficient air to 

p

inst
to 

ent less 

lack

 flame will be 

unit

ldings of conventional frame, brick or 

win
adeq

inst
outs

he outside 

twic
each
GPH
the 

ng by at least four percent. The 

om should be isolated from any area served by 

xhaust fans. Do not install an exhaust fan in this 

om. 

 

tory combustion is 1 square inch of free area 

ously, the 

f thermometers, adjust the blower speed 

ntil the temperature rise through the unit is equal to 
5 degrees – 80 degrees (difference in temperature 
etween air entering and leaving the unit). 

 Unless the temperature of the air entering the units 

 excessively high (75 degrees or more) such 

djustment will result in continued burner operation 

ith a high limit setting of 180 degrees to 200 

egrees. Should it be impossible to gain an 85 
egree temperature rise through the unit, the 

dications are that the fan is running too fast for the 

en

n

than

ir 

rcuited back to 

 
   In

low

thermostat to highest 

ti

 purposes of continued burner operation 

stment) and limit control 180 degrees to 

 not as reliable as that described in the 

 by the 

high 

ation 

NOTE: Do not exceed motor rating. 

inches at the stack.
measu
 
 Excessive draft causes high stack temperatures and 
consequently a waste of fuel. Therefore, a reliable 
draft regulator is strongly recommended for 
p
insures efficient, economical operation of the burner. 
A good draft regul
sh
 

Minimum recommended chim
    
        Input/hour                       
 

    Up to 120,000…………………………... 5” 
120,001-180,000………………………….. 6
180,001-250,000………………………….. 7” 
250,001-
320,001-410,000…………
410,001-510,000……………………
510,001-610,000…………
610,001-730,000………………………
730,001-860,000……………
860,001-1,000,0
1,
 

NOTE: 
contains more than 

draft hood

pipe and 

 

 

Combustion Air Supply 

 

o not 

sup ly combustion. Occasionally, it is necessary to 

all windows or louvers in a door to these rooms, 

obtain sufficient air and to prev

atmospheric air pressure in the room. If there is a 

 of combustion air, the burner

yellow and formation of soot will occur in heating 

. In bui

stone construction without utility rooms, basement 

dows, or stair doors, infiltration is normally 

uate to provide air for combustion and fo

operation of the barometric draft control. For 

allation in an enclosed utility room with an 

ide wall, a fresh air opening to t

should be made with a free cross sectional area of 

e the area of the flue outlet of 100 sq. inches for 

 gallon nozzle size (Example: 10x10 for 1.00 

). For each 1,000 feet above sea level, increase 

fresh air openi

ro
e
ro

GAS 

   Fresh air requirement into the furnace room for 

atisfac

s
for each 1,000 BTU input and a minimum of 100 sq. 
in.  
 

D.

 

Blower Adjustment 

 

   Because the Cox Heating unit is so versatile in its 
application, it is impossible to be specific in 

commending blower speed. Obvi

re
quantity and quality of the duct work and the manner 
in which it is applied affects the air delivery. 
 
   To adjust blower speed to the applied conditions, it 
is recommended that the thermostat be set at highest 
setting to gain prolonged burner operation. By 

eans o

m
u
7
b
 
  
is
a
w
d
d
in
int

ded application of the furnace. Should the air 

bei g supplied to the unit be at a temperature higher 

 95 degrees, the indications are that the heated 

leaving the unit is being short ci

a
the unit. The remedy is revision of the supply 
system, return system, or both. 

 many instances, it will be possible to adjust the 

er speed by setting the 

b
set ng (for
during adju
200 degrees, increasing then, the blower speed until 
the burner no longer cuts out on high limit. Should 
the burner cycle on high limit setting, indications are 
that the duct static pressure is higher than intended 
by the manufacturer, or the temperature of the air 
being supplied the unit is excessive. This latter 
method is
foregoing paragraph which will be applied
better qualified installer. Should the blower moto
cut out, indications are: inadequate firing rate, fa
off setting too high, overload of motor, too 
temperature air supplied to the unit or a combin
of same. Duct heaters have a minimum air 
requirement as given in “Furnace Specification” 
Section Chart. 
 
 

Summary of Contents for HO-225

Page 1: ...Products Commercial Installation Operator s Nov 99 Heating Furnace And Manual...

Page 2: ...ed furnace assembly Gas or oil burner 1 Heat exchanger combustion chamber and 1 Oil or gas burner and controls casing 1 Oil nozzle 1 Blower and pulley 1 Instruction manual and literature 1 Motor and p...

Page 3: ...Stack G C K Inspection Port onnector L Fiberglass Rope Seal H Heat hanger M Combustion Chamber D Radiator I Heat Exchanger Baffle N Refractory Lining E Radiator Baffle O Burner Port B Fan and Motor C...

Page 4: ...BTU HR 225 000 300 000 400 000 Input Gas BTU HR 245 000 375 000 500 000 Input Oil GPH 2 00 2 50 3 50 CFM 33 WC ESP 2400 3400 4800 Blower Motor HP 3 4 1 1 1 2 Stack Diameter in 9 10 12 NOTES 1 Gas bur...

Page 5: ...control listee s name and listed marking A bustible flooring only The safety control shall bear the contro Horizontal clearances be installed in an alcove with the following name listed markings and...

Page 6: ...l windows or louvers in a door to these rooms obtain sufficient air and to prev atmospheric air pressure in the room If there is a of combustion air the burner yellow and formation of soot will occur...

Page 7: ...ing it will be permissible to take CO2 over the fire which will be acceptable In this event both CO2 readings shall be recorded after 10 minutes of operation Readings During the period of operation to...

Page 8: ...Pump supplies fuel to nozzle Burner ignites Furnace blower activates at blower ON setting Area is heated and thermostat is satisfied Protector relay de energizes burner components Furnace blower cont...

Page 9: ...of draft GAS Every gas burner should be serviced at least once a year preferably at the beginning of the heating season moving thermostat 5 Make certain that fire burns cle OTE For complete burner ope...

Page 10: ...10...

Page 11: ...11...

Page 12: ...12...

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