Carrier 58SX040-IBC Furnace User Manual

 ED
HEATING & COOLING
58SX040-IBC
(Only)
Deluxe Gas-Fired Condensing Furnaces
Application Data
Installation Guidelines—Procedures
INTRODUCTION
Portions of the following instructions have been adopted in
part from the current edition of the National Fuel Gas Code
NFPA No. 54, TIA-54-1984-1/ANSI Z223.1-1984, Z223.1a-
1987 and American Gas Association. For further details,
consult this publication, or the current edition available
from National Fire Protection Association, Inc, Battery-
march Park, Quincy, MA 02269, or American Gas Associa-
tion, 1515 Wilson Boulevard, Arlington, VA 22209.
These instructions cover minimum requirements and con-
form to existing national standards and safety codes. In
some instances, these instructions exceed certain local
codes and ordinances, especially those that may not have
kept pace with changing residential construction practices.
Carrier requires these standard procedures as a minimum
for a safe installation.
Refer also to regulations of the local gas supplier as well as
to local building, heating, plumbing, or other codes in effect
in area in which installation is made.
A CAUTION
Application of this furnace should be indoors with spe-
cial attention given to vent sizing and material, gas
input rate, air temperature rise, and unit sizing.
Improper installation or misapplication of the furnace
can require excessive servicing or cause premature com-
ponent failure.
This furnace is designed for a minimum continuous return
air temperature of 60 degrees F DB or an intermittent oper-
ation down to 55 degrees F DB such as when used with a
thermostat night setback.
A WARNING
Never store anything on, or in contact with, the fur-
nace, such as:
Spray or aerosol cans, rags, brooms, dust mops, vac-
uum cleaners, or other cleaning tools. |
Soap powders, bleaches, waxes or other cleaning com-
pounds, plastic or plastic containers, gasoline, kerosene,
cigarette lighter fluid, dry-cleaning fluids, or other vola-
tile fluids.
Paint thinners and other painting compounds, paper
bags or other paper products.
A failure to adhere to this warning can cause corrosion
of the heat exchanger and vent system, fire, personal
injury, or death.
CONTENTS
Page
INSPECTION ........... неее. La ee ea ea ea ee ae ea ane» 1
FURNACE LOCATION. «o.oo icici cee 1
GAS PIPING «oi etter eee 1,2
COMBUSTION-AIRAND VENTPIPING ................ 2-5
CONDENSATE DRAIN ............esrenedrerereorec.. 5
ELECTRICAL CONNECTIONS .... iia 5
START-UP, ADJUSTMENT, AND
SAFETY CH ECK rear re 5-7
INSPECTION
Available power supply must meet specifications on furnace
rating plate and on all motors in the equipment.
Check the available gas supply to see that it conforms to
the gas specification on the A.G.A. rating plate.
FURNACE LOCATION
Locate the furnace as near the center of the air distribution
system as possible.
This furnace may be located in a confined space without
special provisions for dilution or ventilation air.
Provide ample space for servicing and cleaning. Always
comply with the minimum fire protection clearances shown
on the unit rating plate. This furnace must NOT be installed
directly on carpeting, tile, or any combustible material other
than wood flooring.
A CAUTION
Do not install furnace in unconditioned space that could
experience temperatures of 32 F or lower.
NOTE: For proper furnace operation, the furnace must be
installed within 1/2 in. of level. |
When furnace supply ducts deliver air to areas outside the
space containing the furnace, return air ducts must also be
sealed to furnace casing and must terminate outside the
space containing the furnace. Otherwise, a negative pres-
sure condition could develop within equipment room or
space.
Furnace Location Relative to Cooling Equipment—Instali
cooling coil in parallel with, or on downstream side of, fur-
nace to reduce potential for condensation in heat exchanger.
When a coil is installed in parallel with a furnace, dampers
or other means used to control airflow must prevent chilled
air from entering furnace. For manual damper operation,
equip dampers with a means of preventing operation of
either unit unless damper is in the full-heat or full-cool
position.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 515-820
Book 1 PC 101
Tab |6a
Printed in U.S.A.
Form 58SX-9XA Pg 1 1-88 Repiaces: 58SX-7XA
Special Locations—When installing furnace in a residential
garage, protect it from physical damage by vehicles. Fur-
naces installed in public garages, airplane hangers, or other
buildings having hazardous atmospheres must comply with
requirements of the National Fire Protection Association,
Inc.-
GAS PIPING
Gas piping must be installed in accordance with national
and local codes.
Run a separate gas supply line directly from the meter to
the furnace, if possible. Table 1 shows recommended gas
pipe sizing. Slope all pipe 1/4 inch in 15 ft to prevent traps.
Slope all horizontal runs away from meter and toward
risers. Use risers to connect lines to furnace and meter.
Apply joint compounds (pipe dope) sparingly and only to
male threads of joints. Consult local gas supplier for com-
pound recommendations.
. NOTE: Use only compounds resistant to the action of LP
(propane) gas.
Install a sediment trap in the riser leading to the furnace to
trap dirt and condensate. Connect a tee to the riser leading
to the furnace, keeping straight-through section of tee verti-
cal. Connect a capped nipple into lower end of tee, so that
nipple extends below level of gas controls (Fig. 1).
Where a gum filter is required by local codes, install it in
accordance with their requirements.
An accessible manual shutoff valve must be installed
upstream of furnace gas controls and within 6 ft of furnace.
A 1/8-in. NPT plugged tapping, accessible for test-gage con-
nection, must also be installed immediately upstream of gas
supply connection to furnace and downstream of manual
shutoff valve.
Install a ground joint union between gas control manifold
and manual gas shutoff valve (Fig. 1).
A CAUTION
Use a backup wrench when connecting gas pipe to fur-
nace to avoid damaging gas controls.
A WARNING
Use the proper length of pipes to avoid stress on the
gas control manifold. A failure to adhere to this warn-
ing can cause a gas leak resulting in a fire, explosion,
physical injury, or death.
Protect all segments of the piping system against physical
and thermal damage. Support all piping with appropriate
straps or hangers (one hanger every 6 ft minimum). For pipe
Table 1—Maximum Capacity of Pipe*
NOMINAL INTERNAL
IRON PIPE DIAMETER LENGTH OF PIPE (ft)
SIZE (in.) (in.) 10 20 30 40 50
12 _ 0.6022 175 120 97 82 13
3/4 0.824 360 250 200 | 170 | 151
1 1.049 680 465 375 | 320 | 285
1-1/4 1.380 1400 950 770 | 660 | 580
1-1/2 1.610 2100 | 1460 | 1180 | 990 | 900
Ref; Table C4 NFPA 54-1984
*Cubic ft of gas per hour, for gas pressures of 0.5 psig (14 in. wc) or less,
and a pressure drop of 0.5 in. wc (based on a 0.60 specific gravity gas).
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
SEDIMENT
TRAP
UNION
A84218
Fig. 1—Ground Joint Union and Sediment Trap
sizes larger than 1/ 21 in., follow recommendations of national
codes.
A CAUTION
If a flexible connector is required or allowed by the
authority having jurisdiction, black iron pipe must be
installed at the gas valve and extend a minimum of 2 in.
outside the furnace casing.
Pressure-test piping in accordance with local and national
plumbing and gas codes before attaching furnace. Crack
ground joint union before pressure testing. If pressure
“exceeds 0.5 psig (14 in. we), disconnect gas supply line from
furnace before performing pressure test. If test pressure is
equal to or less than 0.5 psig (14 in. wc), close manual shut-
off valve located on gas valve before testing.
After final connection to the furnace has been made, purge
lines and check for leakage with regulated gas supply
pressure.
A WARNING
Never purge line into combustion chamber. Never use
matches, candles, flame, or other sources of ignition to
check for gas leakage. Use a soap-and-water solution to
check for leaks. A failure to adhere to this warning can
cause a fire, explosion, physical injury, or death.
COMBUSTION-AIR AND VENT PIPING
The combustion-air and vent pipe and fittings must con-
form to American National Standards Institute (ANSI)
standards and American Society for Testing and Materials
(ASTM) standards D1785 (schedule-40 PVC), D2665 (PVC-
DWV), D2441 (SDR-21 and SDR-26 PVC) or D2661 (ABS-
DWYV). Pipe cement and primer must conform to ASTM
standards D2564 (PVC) or D2235 (ABS). See Table 3 for
pipe sizing and Fig. 3 through 5 for exterior piping arrange-
ments. See “High-Altitude Pipe Sizing Procedures’ section
for high-altitude applications.
The unit is shipped with a 2-1/2 x 2-1/2-in. rubber coupling.
An optional coupling size 2-1/2 x 2-in. is available through
the Distributor or Branch. See the Replacement Parts cata-
log for the part number.
—2—
a da Ea Aa =
4/2-1N.
fa =] ARMAFLEX
||
В VALVE
iQ! |
a
| Ц IS IN.
т y I
Ee
LEFT SIDE
OPTIONAL
LJ
f A84219
Fig. 2— Tuning Valve Location
The accessory vent terminal kit described below must be
used in constructing the vent terminal for this unit. Pipes
must terminate through either the roof or the sidewall; roof
termination is preferable. Locate sidewall terminations to
prevent damage to shrubs, condensing unit, and siding
materials. Table 2 gives clearance requirements.
A CAUTION
Combustion air must not be taken from inside the
structure because that air frequently is contaminated
by halogens, which include fluorides, chlorides, bro-
mides, and iodides. These elements are found in aero-
sols, detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products. Vapors from
these products are highly corrosive to gas-fired fur-
naces, even in extremely low concentrations (as low as
0.5 ppm). |
Maintain a minimum of 36-in. between combustion-air
inlet and clothes-dryer vent.
Locate the combustion-air inlet as far as possible from
the swimming pool and swimming pool pump house.
NOTE: When a previously common-vented system (furnace
and water heater) is converted to water heater only, the
vent system may be drastically oversized for the water
heater. Consult the National Fuel Gas Code for proper siz-
ing of the vent and revise the system if necessary.
Table 2—Combustion-Air and
Vent Terminal Clearances
LOCATION CLEARANCE
Dryer vent 3ft
From plumbing vent stack 3 ft
Gas appliance vent terminal | 4 ft
From any opening where vent gases 12 in.
could enter building
Above grade and anticipated snow depth 12 in.
Above grade when adjacent to public 7 ft
walkway |
A CAUTION
When the vent pipe is exposed to temperatures below
freezing i.e. when it passes through an unheated space
or when a chimney is used as a raceway, the pipe must
be insulated with 1/2-inch thick Armaflex-type
insulation.
NOTE: The vent pipe must be insulated with 1/2-in. thick
Armaflex insulation from the tuning valve to the point
where the pipe exits the structure.
A CAUTION
When the combustion-air pipe is installed above a sus-
pended ceiling, the pipe must be installed with 1/2-in.
Armaflex insulation. |
The combustion-air pipe should also be insulated in warm,
humid spaces such as basements.
A WARNING
Solvent cements are combustible. Keep away from heat,
sparks, and open flame. Use only in well ventilated
areas. DO NOT breathe vapors. Avoid contact with the
skin or eyes. À failure to adhere to this warning can
cause a fire or physical injury.
A WARNING
All combustion-air and vent pipes must be airtight and
watertight. Pipes must terminate exactly as shown in -
Fig. 3 through 5. A failure to adhere to this warning can
cause property damage, physical injury, or death.
Furnace is shipped from factory assembled for right-hand
vent pipe connection. When left-hand vent connection is
desired, remove cap from left-hand side of inducer outlet
box and install over hole in right-hand side of box.
Remove plastic plug from left-hand casing side panel and
install plug in unused hole in the right-hand casing side
panel.
Install the turning valve in the vertical riser of the vent pipe
18 in. above the elbow, as shown in Fig. 2.
To install piping:
Table 3— Pipe Diameter (in.)
PIPE NUMBER OF 90° ELBOWS
LENGTH (See Notes)
(ft) 1 2 3 4 5
5 2 2 2 2 2
10 2 2 2 2 2
15 2 2 2 2 2
20 2 2 2 2 2
25 2 2 2 2 2
30 2 2 2 2 2
35 2 2 2 2 2
. NOTES:
1. Assume two 45° elbows equal one 90° elbow.
2. Diameters listed are for schedule-40 PVC, PVC-DWV or ABS-DWV pipe.
3. Long radius elbows are desirable. |
4. Elbows and pipe sections supplied in vent terminal kit should not be
included in count.
. Do not exceed 35 linear feet.
on
ROOF
| q COUPLING LA
< BRACKET =
N В | COMBUSTION ns
N | AIR
VERTICAL SEPARATION — :
BETWEEN COMBUSTION ”
AIR AND VENT.
63 FOR 3"KIT
4: FOR 2" KIT
(
\
MAINTAIN 12 IN. MINIMUM CLEARANCE
ABOVE HIGHEST ANTICIPATED SNOW
LEVEL. MAXIMUM OF 24 [N.
ABOVE ROOF.
A87224
Fig. 3— Rooftop Vent Terminal Installation
ss OVERHANG | —
— — m OVERHANG Da
— — N - =
So 12 IN. MINIMUM TT 12 IN. MINIMUM — —
dd — LT 7
— 190° - |
»
COUPLING =
> 12 IN. SEPARATION - BRACKET [2 iN. SEPARATION —
BETWEEN BOTTOM OF — 90° | BETWEEN BOTTOM OF
A, COMBUSTION AIR AND ——_____| — - ~~ COMBUSTION AIR AND
BOTTOM OF VENT —_—_ COMBUSTION— BOTTOM OF VENT, :
_AIR (ELBOW _..
~~ PARALLEL TO т M7
) _ WALL) ЗО MAINTAIN 12 IN.
MAINTAIN 12 IN. CLEARANCE A (PA Y e CLEARANCE ABOVE
ABOVE HIGHEST ANTICIPATED — AT ye ~~ HIGHEST ANTICIPATED
SNOW LEVEL OR GRADE — | 15 N SNOW LEVEL OR GRADE
— | MAXIMUM -—
bc
>
5.
6.
A87225
Fig. 4—Sidewall Vent Terminal Installation
(12 in. above snow level or grade)
Attach factory-supplied flexible coupling to furnace
combustion-air inlet connection and secure with stain-
less steel hose clamp. Ensure that factory-supplied,
perforated metal combustion-air disc is installed in the
flexible coupling.
Working from furnace to outside, cut PVC pipe to
required length(s).
Deburr inside and outside of pipe.
Chamfer outside edge of pipe for better distribution of
primer and cement.
Clean and dry all surfaces to be joined.
Check dry fit of pipe and mark insertion depth on pipe.
NOTE: Al pipe should be cut, prepared, and preassembled
before any joint is permanently cemented.
7.
After pipes have been cut and preassembled, apply
10.
11.
—A—
A87226
Fig. 5—Sidewall Vent Terminal Installation
(iess than 12 in. above snow level or grade)
generous layer of PVC primer to pipe fitting socket and
end of pipe to insertion mark. Quickly apply PVC
cement (over primer) to end of pipe and fitting socket.
Apply cement in light, uniform coat on inside of socket
to prevent buildup of excess cement. Apply second coat
of cement to end of pipe.
. While the PVC cement is still wet, insert pipe into
socket with a 1/4-turn twist. Be sure pipe is fully
inserted into fitting socket.
. Wipe excess cement from joint. A continuous bead of
cement is visible around perimeter of a properly made
joint. |
Handle pipe joints carefully until cement sets.
Support piping every 5 ft (minimum) using perforated
metal hanging strap. Slope combustion-air and vent
pipes toward furnace a minimum of 1/4-in./lineal ft
with no sags between hangers.
O
12. Use appropriate methods to seal openings where vent
and combustion-air pipes pass through roof or sidewall.
Vent Terminal Kit Installation—The combustion-air and
vent pipes must terminate outside the structure. The Car-
rier accessory vent termination kit for 2-in. diameter pipe
(required) must be installed as shown in Fig. 3, 4 or 5. Roof
termination, shown in Fig. 3, is preferred. The kit contains
extra parts for the various applications.
NOTE: The shaded portions of Fig. 8, 4 and 5 are consid-
ered part of the vent terminal and are provided in the vent
terminal kit. They should not be counted, therefore, in pipe
diameter calculations.
ROOFTOP VENT TERMINAL INSTALLATION (Fig. 3)
NOTE: The solid-line arrangement in Fig. 3 is the preferred
arrangement; the dashed-line arrangement is an option for
the combustion-air pipe.
1. Remove one 90° elbow from elbow and bracket assem-
bly provided in kit. Loosen screw so other elbow can
turn.
2. Loosely install elbow with bracket on combustion-air
pipe.
3. Loosely install pipe coupling, provided in kit, on prop-
erly cut vent pipe. Position coupling so that bracket
~ will mount as shown in Fig. 3.
4. Disassemble loose pipe fittings. Clean them and apply
cement using procedures described in Combustion-Air
and Vent Piping.
5. Install bracket as shown in Fig. 3. |
6. For applications using combustion-air pipe option (indi-
cated by dashed lines in Fig. 3), install 90-degree street
ell into 90-degree elbow, making a U-fitting. Install the
open end of 90-degree street ell onto combustion-air
pipe. |
SIDEWALL VENT TERMINAL INSTALLATION -
Install kit as follows when combustion-air and vent pipes
exit through sidewall 12 in. or more above highest antici-
pated snow level or grade (Fig. 4).
NOTE: The solid-line arrangement in Fig. 4 is preferred.
The dashed-line arrangement is an option for the vent pipe
only.
1. Loosely install elbow and bracket assembly on
combustion-air and vent pipes.
2. Remove and disassemble elbow and bracket assembly.
3. Install elbows as shown in Fig. 4. Clean them and
apply cement using procedures described in Com-
bustion-Air and Vent Piping.
4. Install bracket as shown in Fig. 4.
5. Position vent-pipe assembly, maintaining a 12-in. sepa-
ration. Cement vent pipe in elbow as shown in Fig. 4.
6. For applications using vent-pipe option (indicated by
dashed lines in Fig. 4), rotate elbow 90° from position
shown.
Install kit as follows when combustion-air and vent pipes
exit through sidewall less than 12 in. above highest antici-
pated snow level or grade (Fig. 5):
NOTE: The solid-line arrangement in Fig. 5 is preferred.
The dashed-line arrangement shown is an option for the
vent pipe only.
1. Remove one elbow from the elbow and bracket assem-
bly. (The elbow remaining will be connected to
combustion-air pipe).
2. Install the 90-degree street ell into the 90-degree elbow
remaining in elbow and bracket assembly, making a
U-fitting.
. Loosely install coupling on end of vent pipe.
4. Loosely install U-fitting and bracket as shown in
Fig. 5. Position U-fitting so that open end is against
building wall.
5. Loosely install vent-pipe assembly in coupling as
shown in Fig. 5.
6. Check required dimension as shown in Fig. 5.
7. Disassemble loose pipe fittings. Clean them and apply
cement using procedures described in Combustion-Air
and Vent Piping.
8. Install bracket as shown in Fig. 5.
CONDENSATE DRAIN
Route the condensate to a nearby floor drain or condensate
pump. If a condensate pump is required, it should have a
corrosion-resistant impeller and tank.
The 1/2-inch diameter schedule 40 PVC or CPVC condensate
drain pipe fittings must conform to ANSI standards and
ASTM D1785 and D2846. The schedule 40 PVC or CPVC
cement and primer must conform to ASTM F493 or D2564.
For proper condensate drainage, furnace must be within
1/2-in. of level. Highest corner of furnace must not be more
than 1/2-in. above lowest corner.
NOTE: The furnace contains an internal condensate trap;
do NOT install external trap.
1. Determine the side of furnace from which drain will
exit. Cut and preassemble drain piping (field-supplied)
directly to an open drain. Refer to Combustion-Air and
Vent Piping for instructions on preparing and cement-
ing plastic pipe.
2. Cement elbow on pipe assembly (factory supplied) to
condensate trap mounted on blower housing.
3. Using a second wrench to hold assembly, attach first
section of field-supplied drain pipe to compression cou-
pling provided.
4. When using schedule 40 PVC drain pipe, connect
adapter provided to end of pipe installed in compres-
sion fitting.
5. Attach field-supplied schedule 40 PVC adapter to
threaded factory adapter.
6. Cement remaining pipe joints.
START-UP, ADJUSTMENT, AND SAFETY CHECK
Adjusting Tuning Valve—Before firing the furnace, adjust
the pressure drop through the heat exchanger for maximum
efficiency, following the steps below.
o
A CAUTION
Bes sure gas supply to furnace i is turned off.
1. Install field-supplied plastic tee between pressure tap
on bottom of gas valve and pressure tube as shown in
Fig. 6.
2. Install second field-supplied plastic tee between pres-
sure switch and pressure tube from collector box. See
Fig. 6.
3. Connect slope gage to tees (Fig. 6.)
4. Close R-W circuit to start inducer motor.
5. Adjust tuning valve to obtain 0.83 + 0.01 in. negative
water column.
6. Remove handle from tuning valve and recheck pres-
sure. Store handle in safe place.
—5—
7. Open R-W circuit.
. Disconnect slope gage.
9. Remove plastic tees and reconnect factory pressure
tubes to gas valve and pressure switch.
10. Turn on gas supply to furnace.
oo
Ignition System Check—When all connections have been
checked, light the furnace using procedure outlined on light-
ing instruction attached to furnace. When lighting the fur-
nace for the first time, however, perform the following addi-
tional steps:
1. If gas supply was not purged before connecting fur-
nace, line will be full of air. Loosen ground joint union
and allow supply line to purge until gas odor is
detected. Never purge gas lines into a combustion
chamber. Immediately upon detection of gas odor,
retighten union. After 5 minutes, light furnace in
accordance with instructions on furnace rating plate.
2. Main burners should light 25 to 75 seconds after pilot.
If main burners do not light within prescribed time
period, check pilot flame.
3. The pilot flame should be soft blue in color and it must
provide good impingement on the pilot switching ele-
ment. The flame should extend above the burner carry-
‘over port to provide a proper burner ignition. When the
pilot flame requires adjustment:
a. Locate adjustment screw marked “PILOT ADJ” on
top of gas valve.
b. Remove cap and turn adjustment screw clockwise
to decrease pilot gas flow. Turn screw counterclock-
wise to increase pilot gas flow.
c. When proper adjustment is obtained, replace screw
cap.
Gas Input
NOTE: Be sure reference pressure tube, combustion-air and
vent pipes, and burner enclosure front are in place when
clocking the gas meter.
1. Determine gas input.
a. Turn off all other gas appliances and pilots.
b. Measure time (in seconds) for gas meter test dial to
complete one revolution.
c. Refer to Table 4 for cu ft of gas per hour.
d. Multiply cu ft/hr by heating value of gas (Btu/cu ft)
obtained from local gas utility.
EXAMPLE:
Btu heating input = Btu/cu ft times cu ft/hr
Heating value of gas = 1070 Btu/cu ft
Time for one revolution of 2-cu-ft dial = 72 sec
Gas rate = 100 cu ft/hr (from Table 4)
Btu heating input = 1070 x 100 = 107,000 Btuh
e. Measured gas input must not exceed gas input on
unit rating plate.
2. To adjust input rate:
a. Remove burner enclosure front and cap that con-
ceals adjustment screw for gas valve regulator.
b. Turn adjusting screw either counterclockwise (out)
to decrease input rate or clockwise to increase rate.
When adjusting input rate, do NOT change mani-
fold pressure more than 3.2 minimum to 3.8 maxi-
mum in. wc. Make any major adjustments by
changing main burner orifices.
NOTE: Manifold pressure must always be measured with
burner enclosure front removed. The gas meter must always
be clocked with burner enclosure front installed.
BURNER TUBE
ASSY Dog
PLASTIC TEES
"a
COLLECTOR BOX TUBE
SLOPE GAGE OR
DIGITAL MANOMETER 484500
Fig. 6—Tuning Valve Adjustment
c. Replace burner enclosure front and measure
adjusted gas input rate using method outlines in
step 1.
d. Replace cap that conceals gas valve regulator
adjustment screw.
NC ULI
Be sure burner enclosure front is in place after adjust-
ments have been made.
3. Look through sight glass in burner enclosure and check
burner and pilot flame. The main burner flame should
be clear blue, almost transparent. The pilot flame
should be well defined. See Fig. 7.
Table 4— Gas Rate in Cu Ft/Hr
SECONDS SIZE OF SECONDS SIZE OF
FOR ONE TEST DIAL FOR ONE TEST DIAL
REVOLU- 1 2 5 REVOLU- 1 2 5
TION cu ft | cu ft | cu ft TION cu ft | cu ft | cu ft
10 360 | 720 | 1800 50 72 144 | 360
11 327 | 655 | 1636 51 71 141 | 355
12 300 | 600 | 1500 52 69 138 | 346
13 277 | 555 | 1385 53 68 136 | 340
14 257 | 514 | 1286 54 67 133 | 333
15 240 | 480 | 1200 55 65 131 | 327
16 225 | 450 | 1125 56 64 129 | 321
17 212 | 424 | 1059 57 63 126 | 316
18 200 | 400 | 1000 58 62 124 | 310
19 189 | 379 947 59 61 122 | 305
20 180 | 360 900 60 60 120 | 300
21 171 | 343 857 62 58 116 | 290
22 164 | 327 818 64 56 112 | 281
23 157 i 313 783 66 54 109 | 273
24 150 | 300 750 68 53 106 | 265
25 144 | 288 720 70 51 103 | 257
26 138 | 277 692 72 50 100 | 250
27 133 | 267 667 74 48 97 | 243
28 129 | 257 643 76 47 95 | 237
29 124 | 248 621 78 46 92 | 231
30 120 | 240 600 80 | 45 90 | 225
31 116 | 232 581 82 44 88 | 220
32 113 | 225 563 84 43 86 | 214
33 109 | 218 545 86 42 84 | 209
34 106 | 212 529 88 41 82 | 205
35 103 | 206 514 90 40 80 | 200
36 100 | 200 500 92 39 78 | 196
37 97 | 195 486 94 38 76 | 192
38 95 | 189 474 96 38 75 | 188
39 92 | 185 462 98 37 ‘| 74 | 184
40 90 | 180 450 100 36 72 | 180
41 88 | 176 439 102 35 71 | 178
42 86 | 172 429 104 35 69 | 173
43 84 | 167 419 106 34 68 | 170
44 82 | 164 409 108 33 67 | 167
45 80 | 160 400 110 33 65 | 164
46 78 | 157 391 112 | 32 64 | 161
47 76 | 153 383 116 31 62 | 155
48 75 | 150 375 120 30 60 | 150
49 73 | 147 367
—6—
5
PILOT FLAME
BURNER FLAME
MANIFOLD
A84076
Fig. 7—Proper Pilot and Burner Flames
4. High Altitude—Input ratings apply for altitudes up to
2000 feet. Ratings for altitudes above 2000 ft must be
4% less for each 1000 ft above sea level.
Temperature Rise—Do NOT operate furnace outside range
of temperature rise specified on unit rating plate. Determine
air temperature rise as follows:
1. Place thermometers in return and supply ducts as near
furnace as possible. Thermometers must not “see”
heating element or radiant heat may affect readings.
This practice is particularly important with straight-
run ducts.
2. When thermometer readings stabilize, subtract return-
air temperature from supply-air temperature to deter-
mine air temperature rise.
3. Adjust temperature rise by adjusting blower speed.
Increase blower speed to reduce temperature rise.
Decrease blower speed to increase temperature rise.
Thermostat Heat Anticipator Adjustment—Thermostat
heat anticipator must be set to match amp draw of compo-
nents in R-W circuit. Accurate amp draw measurements can
be obtained at thermostat subbase terminals R and W. Fig-
ure 8 illustrates an easy method of obtaining these measure-
ments. Amp reading should be taken after blower has
started on its heating speed. |
Safety Check of Limit Control—Control shuts off combus-
tion gas supply and energizes circulating-air blower motor if
furnace overheats.
THERMOSTAT
TERMINALS
FROM UNIT LOW-VOLTAGE
TERMINAL BLOCK OF FAN COIL
5.0 AMPS ON AMMETER
10 TURNS AROUND JAWS
EXAMPLE: = 0.5 AMPS FOR THERMOSTAT SETTING
A80201
Fig. 85— Amp Draw Measurements
Recommended method of checking this limit control is to
gradually block off return air after furnace has been operat-
ing for at least 5 minutes. As soon as limit control func-
tions, return-air opening should be unblocked to permit
normal air circulation. By using this method to check limit
control, proper functioning can be determined and furnace
will fail-safe if circulating air supply is restricted or motor
fails. If limit control does not function during this test, iden-
tify and correct cause of malfunction.
Safety Check of Flow-Sensing Switch—This control
proves operation of draft inducer. Check switch operation as
follows:
1. Turn off 115-v power supply to furnace.
2. Remove control access panel and disconnect inducer-
motor lead wires from inducer printed-circuit board.
3. Turn on 115-v power supply to furnace.
4. Close thermostat switch as if making normal furnace
start. When flow-sensing switch is functioning prop-
erly, gas should not flow to pilot and ignitor should not
operate. If either pilot gas flow or ignitor operation
occurs when inducer motor is disconnected, shut fur-
nace down immediately. Determine cause of malfunc-
tion and correct condition.
5. Turn off 115-v power supply to furnace.
6. Reconnect inducer-motor leads, reinstall control access
panel, and turn on 115-v power supply.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 PC 101 Catalog No. 515-820 Printed in U.S.A. Form 58SX-9XA Pg8 1-88 Replaces: 585X-7XA
Tab |6a