Coleman 7600 User manual

MOBITE HOME DIVISION
o
PRESIDENTIAL GAs FURNACEs
Form 4-457
Price: S1.OO
o

tta
TABIE OF CONTENTS
INTRODUCTION . .
SPECIFICATIONS
ACCESSORIES
APPLICATION
FURNACE INSTALLATION 1,8
INSTALLATION INSTRUCTIONS 9-I5
GAS VALVE
PILOT ADJUSTMENT
GAS CONVERSION
HEAT EXCHANGER
AIR REQUIREMENTS
FAN/LIMIT SWITCHES
THERMOSTATS. .t6.17
LIGHTINGINSTRI.rcTIONS .-. .....18
ELBCTRICAL CIRCI.IITS l9-ll
WIRING DIAGRAMS .]]. ]3
AIR CONDITIONING BLOWER INSTALI.A,TION . ]+3O
BLOWER WTRING DIAGRAMS
HEATINGSERVICECHARTS .....- 3I
2
J
4
5,6
a

INTRODUCTION
The Coleman PRESIDENTTAL Mobile Home Furnace
is designed for total year around air conditioning com-
fort. lt is constructed to pror ide ma.rinrum heating
efficienct,in winter and cooling comlort during thc
summer months.
Additional construction features are:
l. The Coleman PRESIDE\TlAl- furnace has an
adjustablc duct connector B1 har ing l'arious lengths.
\\re can co\ er a u rde ran-oe ol dcpths.
2. J'herc is a chorce ot'eieht locations I'or the fresh
air intake duct.
3. I he PRESIDE\TIAL has a one-piecc ribbed casing
that is lined u ith loil-faccd fiberglass.
4. The bloler is rubber mounted to provide conrplet.
motor hum isolation.
5. The re are no duct connector clamps.
6. The pilot orilice does not har"e to be changed uhen
con\ertinS fronr one gas to another.
7. The PRESIDENI'lAL I'urnace I'an switch has a fast
"ON" time to pror ide nrore blower "ON" tinre
rr hich will prevent the air f'ronr stratili,ing.
8. Return air is preheated in the blou,er compartment
to provide more elTiciencl .
9 l-he t\\o-stage valve provides quiet burner ignition.
l0 -\ lar-se sight glass has becn pror idcd to obsen'e
thc pilot errd hurner operation
\ir conditioning may be installed at anv time rvithout
r;rtrdriicatrtrn of' the furnace. Provision has been made
trrf tlrc additiorr ol the coil at the bottom of the furnace.
The pre-chargcd refrigerant lines connecting the con-
dr-n>ing unit to the evaporator coil emplol'a quick
ctrnn3s-I iirting at thc coil and at the condenser end. Thc
rllie: in the littings are self opening u'hen the connec-
ntrr. i> nr,ide and self sealing whcn the conncction is
b:ir.-::r Th.' seli-sealing feature allou s complcte
:-^!r:r.il\ o1'the L-quipment without loss of refrigerant.

I\IOBILE HOME
PRESIDENTIAL GAS FURNACES
CONTAINS SINGLE SPEED HEATING BLOWER OR
3.SPEED HEATING AND AIR CONDITIONING BLOWER
SPECIFICATIONS
A.G.A. REQUIREMENTS
NOTE: For elevations above
2,000 feet, derate furnace
4 percent for each 1,000 feet
of elevltion above sea level.
C.G.A. REQUIREMENTS
NOTE: Approved for 0 to
4.500 feet elevation, for
elevation above 4,500 feet
dcrate furnace 4 percent
for each 1.000 t-eet of
ele\ ation above sea level.
20 30
7l_i r 0:_i
lG3,4" .. l"
l0'
* The 7600-700 Series fitrn:.c .'.::::::i'rt': . l" \ \ Trrn:I.rrmer
The basic difference between the 7600-,00:3:.3s:l:r--:.-e ird tl'.e lt'00-r00 series iuririe rs tl'Le
transformer.
The 7600-700 series furnace is equipped riith r l0 \..\ Ilirnsirrrmer. See tigures ll.l3 and l-1.
The 7600300 series furnace is equipped *itn: +0 \'.\ tr:rnsirrrmer. See ligures 16. l7 and lE.
This difference in transformers also meilns r slrqlii diiiererlce in tlre rvirir.rg of this tlrnace slien
installing air conditioning. When installing air curnditioning *ith this turnace jt is important that a
determination be made as to the size tr3nsfLrrmer installed in the furnace. Then. consuit the
appropriate wiring diagram shown at the end oi tiris book.
LOOK AT THIS WIDE CHOICE OF AVAILABLE OPTIONS
Note: Oil Solar-Pak Vaporizing (Pot Type) Furnaces are available as a regular stock item.
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SPECIFICATIONS
\IODEL NO. 7660 7670 7680 7660 7670 7680
SERIES Nat.
L.P.
*756i 85 6
+7 59 I 859
E 756/856
+7 59 1859
-jt' i5c il 8'16
--<:r:-<- 3-{9
846
849 846 849
InDut - Btuh 60,000 70,000 E 0.0 011 6 il [rlfil 70.000 80,000
Output - Btuh 48.000 s 6,000 6-1.ar0i-r J! -r -,-r I _i6.000 64,000
Power Supply 15V/60Cy/lPh I1-<\' 60Cr-/1Ph
Blower Assembly 7660-590 7670-590 758G590 I l660-693 7670593 7680{93
d
F
ipeed Tap L,.; \{ediu:r High
Horsepower (H.P.) l /10 rl6 t6
Volts/Cycle/Phase 115/60/1 lis 60 I
RPM 800 800 80 vl r0i0
Amps. 5.0 78 56 i:i 5b '70
rVatts 29s 510 -s t)0 610 665
itatic Pressure 15 15
&
F.l
F.l
ca
alir Delivery - C.F.M. 600 730
ilheel 9x7 lG314" x 7"
lcroll 910"
PRES I DENTIAL
SYSTEM
r, :- -i- J Output
::: -cs - sied
DELUXE
EXPANSION
VALVE
A.COIL
(To ns)
KSTANDARD
BLOWER
(SH I PPED
WITH
FURNACE)
BLOWER CONVERSION
FOR A/C
(PACKAGE INCLUDES
THERMOSTAT SUB BASE
AND FILTER)
CONDENSERS
(Tons)
THERM.
OSTAT
(SH I PPED
WITH
FURNACE)
CUSTOM
EXPANSION
VALVE
A-COtL
(Tons)
I
| 6256-830
| 'o,2' z'3'31 z
az5a 830
':' 2' :-3-3' z
G
AAvailable
tn
M id-
'97'.
(r
Single sper
Htg Only
7660_6921 for 2.21/z ton
7660-6931 for 3 ton
7660-690'f lor 31iz ton
Pres identia I 2-21/z -3-31
/z
Polar Prince 2-21/z-3 15' 25' 40' H eati ng Only Optronal
Single speed
Htg Only
7660.692 1
7660,6931
7660-6901
or 2-21/z lon
or 3 ton
or 31/2 ton
Pres idential 2-2t 12-3-31/z
Polar Prince 2-21/z-3 15/ 251 401 Heati ng Only Opt ion a
Single speed
Htg Only
7660-6921 Iot 2-21i2 ton
7660-6931 for 3 ton
7660-6901 for 31,, ton
Presidential 2-21/z-3-31/z
Polar Prince 2-21/z-3 15' 25'
40, H eati ng
On ry
7660_6901 for 31,/z ton Presidential 2-21 12-3-31 2
Polar Prince 2-21 2-3
1 5' 25'
| 7i50.5-a01 f or 3' 2 ton Presidential 2-2' z-3-3
Polar Prnce 2.2' z-3 32=
': .:

ACCESSORIES
Pari N umber Itenr t scd On
7660-28 l
7660-281
6256-8.r0
6256-8-.r I
6256-8 I 2
6256-6 I 5
6256-625
6256-6,10
6256-7 I 5
625 6-7 I 5
625 6---10
6156-E I 5
615 6-E I l
6156-\-1()
6156-r6( I
-66(r-5-l-l
- 66( r-j -19
-f,6t)-r. I l
- 66()-6.1-1
- 66()-r.li
- 660-6f.9
- 66()-6 - 9
-660-6 I 9
.66()-6 l9
;660 \ 69(
7 660-69 l
7 660-69 -l
7660--05
7 660-701
7 660-706
7 660-708
1660-622
1 660-671
7660-62 I
7 660-623
1 610-6t9
1 610-629
1 610-670
7 670-630
7660-625
1 660-621
7660-626
7660-628
I 660-61 A
7660-620
7670-.170
6
6
6
(.-
-t
J
I
C'
C
I
-1(
R
F
R
F
F
F
l.
t:
lt
t(
l(
I
2
3
R
R
R
R
St
St
St
St
M
i\'l
N1
l\l
E:
[:;
F-;
E:
-ilinr RLng { l'kg l )
:rlrng R,n-l {l'kg. )5) ... ......
,l (,l,r J ri.,,, i'r-{tnui i ng c., j i i ili;;;;ii;', \',ii' .,
: C,rndititrning Cooling Coil (Expansiort \.tlr:t
rr C-ontiitirrning. Coolitrg Coil (Erprnsion \.rlrc'
I'l:eh.tr!:cd I itrc
Pr..lt:'rrr.l line
' I'r:uh.rrr:cd Lirte
P::,lr.u-:eJ Iirrc
i ['r.'chrLtgcd l-inc
, Pt:lltrrt-r.:cJ Line
I'rechlrged I inc
Pre.hrrrged I inc
' l'r.clrrtrS:d I ine..
:ar lntakc Prechargcd-fubing Kit
Itul \\.clllhl\
-'tLrrn \ir Clrille
-onr Suppl) t-ine (l-i" e\tended. l'kg l)
ont Suppll Line (l87r" ertended, Pkg l)
'ont Suppl) l-ine (13" extended. Pkg 6)
ont Suppl) I inc (l{ifr," cxtendcd. Pkg 6)
" t)cep DrLct Conncctor ( Pkg l). 8[" to l ] r. ' D:'::
" Dee p Duct Connector' (Pkg 6), EZ" to I I ." L).'::
" Dccp Duct Conncctor (l'>kg l). U/r" to llL." L).'::
" Dce p Duct Cortncctctt (Pkg 6), l'l/r" tc, ll ." D:::
Specd Air Conuitioning Elloucr l'kg..
Spccd Air (-onditioning BIorlcr ['kg ...
Spccd Air Conditioning Bloucr [)kg ..
ool' .lack \\'edgc (2 x l2 pitch. pkg l)
:roi.Juck Wcdge (2r l2 pitch. pkg 6)
rol Jack \\'edgc (4 x I 2 pitch. pkc | ) ,..
rot .luck \\'cdge (4x l2 pitch. pkg 6)
andald l)uct Cotrncctor (l4" Pkg l), %" to I .' I).
andard Duct C'onnector ( 14" I'kg 6). rA" to I ." t).'
andirrd [)uct (]onncctor ( 16" Pkg l). X" to I ." f).'
rrndard Duct Conncctor ( 16" I']kg 6). Yt" ttt I ." D:
cdiunr Duct Connectot (16" Pkg l). -j/5" to j" l)r'r:
cdiLrm [)uct Conrrector (16" t'kg 6). -]%" to i" [).r::
cdiurr [)uct C'onr]ector (14" Pkg l), -l/i" to j" [)tr:
cdiunr l)uct Connector (14" Pkg 6). li(" to 5" Drr:
ltcndcd l)uct Ctttrncctor (l6" Pkg l).'1r7l" to I .' t)
rtcnded [)Lrct C'onnectoT (i6" Pkg.6)..1fi" to I .'Il
llcndcd [)uc1 Cottnectot' (l:1" Pkg l). 4rl" to 1 ." t)
ltcndcd l)Lrct ('onncctor ( 1.1" Pkg 6). 4/r" to - . t)
luptcr'l)ucka-ue (l'kg l)for 14" DtLct Slstent
Iuptcr l)uckrLge ( I)kg I ) l'or 16" Duct S) stenr
,,rlirr I herttrtr.t;rt Sub-hrsc
-(.00 Scr ics
-600 Sc'rics
-{.00 Scrie\
-6(l(l Serie's
-6()0 Scric.
-6()0 Srt lJ:
-60(l Sr-rir':
-60() 5r'lt.':
I ---1 ttrn unit'
I ---l ton unit.
li..--l t()n unit\
-'1,. ton unit5
3f'1 ton units
-j/,r-i ton ,n,,t
7600 Series
7660. 7670, 7680
7600 Series
7600 Series
7600 Series
7600 Scries
7600 Scries
7600 Series
7600 Series
7(100 Series
7600 Scries
7600 Serics
7600 Serics
7600 Serics
7600 Serics
7600 Scries
7600 Series
7600 Serics
7600 Series
7600 Scries
7600 Series
7600 Serics
7600 Scrics
7600 Scries
7600 Series
7600 Series
7600 Series
7600 Ser ies
7600 Series
7600 Serics
7600 Serics
7600 Serics
7600 Serics
*6 PRECHAR(;ED I,IN[, NI.JI\'IBERS ENDINC; IN 6
INSTA I,I,ATION SPTI(]I FI C'ATIONS Both state and t)u.: ;,',.ys..httuld bc consulted bet'ore
instiilling the lLrrn.:;:
ART] INST]I,ATED.
F!A\iCE
a!€lii\CES
-:; 2'65
S€ lTB
3a+ : r:E
Fr..: i 1:B clo*t)
Closet door grille must have a
minimum ol 200 so in free area
A t1 pical d istributitrn \_\ stcnr is short n above. l-he main
duct should be nr'r:rnallcr than 4 x l6 with any branch
ducts at lcrrt -l r \ Registers should hal'e a l'rcc arca
(except 1'or batlrrtrorn) ot'2E square inches minirnLlm frce
area. ln no casc shoLrld lcss than six floor register\
bc used. Better results arc generall)' obtained s ith
se\ cn or ei-eht rcgisters.

The perlormance of a heating or cooling system depends
lirst of all on the quality of the equipment; secondly,
on the design of the distribution and return air slstem;
and last but not least. the workmanship Lrsed in installing
thc s1'51sm.
The best of equipment, r.r'hen improperly installed, will
not deliver satisfactory performance to the customer.
When the application ol' heating equipment or cooling
equipment is to be made, the procedure to use in the
selection and application is as follows:
L Calculate the heating or cooling load.
2. Sclect equipment.
3. Double check equipment blower capacities.
CALCULATINC THE SYSTEM LOAD
To insure correct systcm sizing, a survev should bc
made of the structure to be air conditioned' -fhe heat
loss and heat gain should be calculated in accordunce
with the procedure contained in the Natitlnal Warm Air
Heating and Air Conditioning Association Manual J.
COMPLY WITH LOCAI, CODES
The installer should familiarize himself with and com-
ply with all local codes and regulations which govern
the installation ol this t1,pe eqLripment. Local codes and
regulations take precedent over any recommendatior.rs
contained in these instructions.
ln lieu of Local Codes, the ecluipment should be installed
in accordance with the National Electrical Code, and
in accordance with the rccommendations made b1' the
National Board of Fire Underwriters.
CHECK ELECTRICAL POWER SUPPLY
The electrical power supply should be checked to'deter-
mine if adequate power is available, and near constant
voltage can be maintained. lf there is any question con-
cerning the power supply, contact the local power com-
pany for corrections; otherwise, unsatisfactory perfor-
mance may result.
ROOF JACK
A close inspection ol the cut-a-way drawing of the roof
jack and furnace shown in Figure 1, will show that both
the flue pipe and the combustion air tube must be
securely attached to the furnace. This is to insure a
complete circuit for the combustion air and flue gases.
The .f urnac'e will nol operate unless the roo/ jat'k has
been properlf installed.
APPLICATION
Figure 1

APPLICATION
The telescoping flue pipe must be firmly seated on the
furnace flue collar and secured with a sheet metal
screw. The telescoping combustion air tube should be
pulled down and sealed against the top of the air chamber
located inside the top of the furnace. The straps,
attached to the combustion air tube. should be secured
to the top of the furnace with sheet metal screws. Sheet
metal screws should not be longer than % inch.
Problems assoc'ialecl u'ith intproper roo./ jack
installation.
Problem: The main burner comes on normally.
Main burner flame and pilot flame begins to lift
immediately, and floats to the top of the heat ex-
changer then goes out.
Cause: This is an indication that:
L The inner flue tube is missing or has not
been securely sealed to the flue outlet of the
furnace,
2. blocked flue.
This results in a recirculation of flue gases and
extinction of main burner and pilot.
Solution:
l. Replace inner flue tube,
2. Secure the flue tube to the flue outlet of the
furnace,
3. Remove block.
Problem: Pilot outage.
Cause: Combustion air tube not installed or not
sealed against the top of the air chamber located
inside the top of the furnace.
Reason:
l. Different pressure zone. Downdraft will ex-
tinguish pilot.
2. Drawing combustion air from inside the home.
Defeats the purpose of sealed combustion.
Solution: Combustion air tube should be installed
and sealed against the top of the air chamber located
inside the top of the furnace.
A cut-a-way drawing of the roof jack is shown in
Figure 2.
Figure 2
CUTA.WAY OF THE
7660-7101 ROOF JACK

FURNACE INSTATTATION
PRESIDENTIAL
FURNACE
-- -l FLUE GASES
COMBUSTION AIR
CAULK UNDER --1-
ROOF !i
il
lr-rl
ilt,
r-r,- -TF
iri'tl
-FLAI
EXTt
CEIL
oFl
- ROOF
JGE MUI
:ND THI
INGAM
INCH
7
CAVITY
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NOTE 1. SLIDE INNER FLUE TUBE-
DOWN FIRMLY OVER
FURNACE OUTLET AND FASTEN
WITH ONE (lISCREW.
NOTE 2. SLIDE OUTER COMBUSTION /
AIR TUBE DOWN FIRMLY OVER
FLANGE ON FURNACE. BEND
TABS DOWN AND SECURE TO
TOP OF FURNACE WITH
SCREWS. (SCREW HOLES ARE
PROVIDEO IN FURNACE CASING).
lt
ll
1l
hai
?/f
-l
)WARM AIR DUCT
;l
y't--)
FRESH AIR CHUTE/

FURNACE INSTALLATION
PRESIDENTIAL
FURNACE
COMBUSTION AIR
CAULK UNDER
FLANGE---
ROOF
WEDGE
CAULK UNDER
ROOF WEDGE
NOTE 1. SLIDE INNER FLUE TUBE
DOWN FIRMLY OVER
OUTLET AND FASTEN WITH
oNE (1)SCREW.
NOTE 2. SLIDE OUTER
AIR TUBE OOWN FIRMLY OVER
FLANGE ON FURNACE. BEND
2 TABS DOWN AND SECURE TO TOP
OF FURNACE WITH SCREWS
(SCREW HOLES ARE PROVIDED IN
FURNACE CASING).
FLANGE MUST
EXTEND THRU
CEILING A
MINIMUM OF
1 INCH.
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ROOF CAVITY
EXTENDED OUCT
ADAPTER AND DUCT
CONNECTOR
EXTENDED FRESH AIR CHUTE
WARM AIR DUCT

GAS PIPING
Route the gas piping or tubing to the furnace. Use th"
black iron pipe or %" O.D. copper tubing If the piping
length exceeds 40', use 't7^" black iron pipe or '/a" copper
tubing.
When using natural gas, branch tubing may be copper
internally tinned or copper tubing containing not more
than 75 percent copper. When using L.P. gas, tubing
may be type K. Be sure to check local authorities for
any other requirements concerning gas piping. It is
recommended that a main shut-off valve be located in
the gas supply line external to the furnace. This shut-
off valve is required by AGA as well as some local
codes.
When making the connection at the gas control valve,
use a wrench on the inlet side to prevent twisting the
valve body which could result in service problems.
After connections have been made, be sure all joints
are checked with soap suds to detect any leaks. This
should also include a check of the furnace controls
and piping. NEVER CHECK FOR LEAKS WITH
A LIGHTED MATCH.
CAUTION: DO NOT TEST THE FUEL SYSTEM AT
MORE THAN 14 INCHES WATER COLUMN AFTER
FURNACE HAS BEEN CONNECTED TO FUEL LINE.
ANY TEST CONDUCTED ABOVE 14 INCHES WATER
COLUMN MAY DAMAGE THE FURNACE CONTROL
VALVE AND VOID THE WARRANTY.
DESCRIPTION
The B57 Midgitrol (Coleman Part No. 7660-3261) is a
combination gas valve which provides all manual and
automatic control functions required for operation of
gas fired heating equipment. This valve is suitable for
use with all gases.
The B5l includes (l) permanently lubricated shear
seal, disc type gas cock, (2) thermomagnet safety
valve, (3) main line automatic valve, (4) pilot gas adjust-
ment valve, and (5) pilot line filter and pressure regu-
lator (optional).
OPERATION
The l00\a shut-off pilot safety section operates from
power bY a 2500G tYPe thermo-
couple d bY Pilot flame. In event
of low outage, safetY valve shuts
off all gas.
Main line automatic gas valve opens and closes in re-
sponse to thermostat or other controls wired in 24 volt
circuit. 24 voitt power is provided by an external
transformer.
INSTALLATION
Use valve within following operating ranges:
Maximum operating pressure: t/z psi (14" WC)
Minimum operating pressure: I oz. (2" WC)
Maximum ambient temperature: 175"F.
l. Valves with Part No. 7660-326 I are step open type
and must be mounted upright in horiz.ontal line.
INSTALLATION INSTRUCTIONS
2. Make sure all piping and tubing is free of foreign
matter. Apply thread seal to male threads only.
3. Connect t7r" pilot tubing bween valve and pilot
burner assembly. Pilot burner assembly m ust be
mounted rigidly in a position where pilot will ignite
main burner when it has been reduced to smallest
flame which will hold thermomagnet safety' valve open.
4. t/,s" external vent connection is located at outlet end
of valve. Connect one end of vent tube to fitting on
valve and position other end near, . but not in, pilot
flame. Main burner flame must not impinge on gen-
erator cartridge or vent tube.
5. Make sure all wiring connections are clean and tight.
Screw thermocouple bushing in fingertight, plus I
turn. with small wrench. DO NOT OVERTIGHTEN.
6. Refer to information furnished with furnace for
proper heat anticipator sctting.
LIGHTING/ RESET
DIAL
EXTERNAL
VENT
CONN
MANI FOLD
PRESS. TAP
PI LOT
GAS
CONN. Figure 3.
LIGHTING PROCEDURE
l. Turn thermostat to lowest selting.
Turn to PILOT. Press dial in and
light pilot. Hold for 60 seconds and
release.
2. Turn dial counterclockwise to ON.
Use this position for thermostat
control. Set thermostat for desired
room temperature.
3. Shut Down Procedure. Press dial
in and turn clockwise to OFF. Use
this position when complete shut-
down is necessary. (Use PILOT
position lor temporary or seasonal
shutdown.)
ADJUSTMENTS See Fig.3 for Location-
Pilot Cas Adjustment. Remove pilot adjustment cap
screw and turn pilot adjustment screw to produce non-
blowing blue flame covering top t7o" of thermocouple
tip. Replace cap screw.

INSTALLATION INSTRUCTIONS
GASKET AND SCREEN DIAPHRAGM THERMOMAGNET
DIAPHRAGM AND/OR GASKET VALVE
ASSEMBLY ASSEMBLY
Figure 4. Typical Cross-sectional
MILLIVOLTMETER TEST
Use 0-50 millivolt scale. Place meter test probes as
shown below. lf meter needle moves to lett of zero or
no reading is ind icated, reverse probes. Take all
readings with pilot burning and thermostat contacts
closed. (Main burner "ON.")
If reading is less than 7 millivolts
l. Adjust pilot gas.
2. Clean primary air holes.
3. Clean pilot burner orifice.
4. Replace thermocouple. and spring.
REGULATOR CONVERSION
WARNING
When t'onverting ttalve f rom or to LP gas use, it vrill
be necessar-t' lo ('honge ntain hurner orifit'e. See /ur-
nat'e nanteplate f or t'ontplete instu('lions.
HOW TO CONVERT
To convert valve pressure regulator from liquefied
petroleum gas to natural gas, or the reverse, lnvert
the convertible regulator cap on the valve. See Fig. 3.
For Natural Gas:
Install convertible regulator cap so that hex
and "NAT GAS" marking appears on upper end
(See Figure 5)
For Liquefied Petroleum Gas:
Install convertible regulator cap so that hex portion is
at lower end and "LP GAS" marking appears on upper
end of cap. (See Figure 6)
CAUTION
When inverting the converlible regulalor t'ap ntake sure
that spring below' t'ap is nol rttisplacerl
l0
REG CAP
VALVE
BODY
REGULATOR
SPRING
REG. ADJ.
SCREW
VALVE BODY
Figure 7. Adjusting Regulator for Nat. Gas
CAUTION
Do not strett'h spring v'hen rentoving ./rom regulator
stenl.
lnsert screwdriver into the two slots of regulator
adjustment screw (See Figure 7). Turn adjustment screw
clockwise to increase pressure, counterclockwise to
decrease pressure. Replace regulator spring.
NOTE: Make sure regulator spring is firmly attached
to regulator stem. Use a Phillips head screwdriver or
similar blunt ended object to press spring down until
you hear or feel it snap in place. Replace convertible
regulator cap with "NAT CAS" marking in up position.
REGU LATOR
ASSEMBLY
Figure 5. Cutaway View of Figure 6. Cutaway View of
Cap Installed for Natural Cap Installed for L.P. Gas
Gai. Note Relaxed Spring. Usage. Note Compressed
SPring.
trNOTE: Old style convertible regulator cap is identified by a double
hex. New cap has only one hex tor easier identification of
gas conversion position,
REGULATOR ADJUSTMENT
The regulator has been factory adjusted to values
stamped on valve.
For LP gas the regulator is not adjustable.
For natural gas use, the valve is equipped with a
limited adjustment type regulator. -fo adjust regulator,
install a measuring device in tA" NPT pressure tap
near valve outlet. Remove convertible regulator cap
CONVERTIBLE
REG. CAP
E
t=
E
portlon
of cap.
OLO STYLE

PILOT ADJUSTMENT
The pitot flame should be adjusted to bathe the end of
the pilot thermocouple with approximately t/r" of f)ame.
The pilot flame should appear blue on natural gas, and
blue with yellow tips if operating on L.P. gas. Remove
the pilot adjusting screw cover cap from the control
valve and adjust the underlying screw to obtain the
proper pilot flame. Replace the cover cap in the control
valve.
GAS CONVERSION INSTRUCTIONS
The PRESIDENTIAL series furnaces are equipped
to burn either natural gas or [-P gas. By using the
proper orifice and adjusting the pressure regulator
and pilot, the furnace can be converted to burn either
gas.
For LP gas, an LP gas identification tag should be
wired to the burner manifold, the orilice in the burner
should be marked "t-P," and the pressure converter
should be adjusted to the "LP" position.
For natural gas, a Natural gas identification tag should
be wired to the burner manifold, the orifice in the
burner should be marked "NAT," and the pressure
converter should be adjusted to the "NAT" position.
The extra orifice and gas identification tag are in the
cloth bag attached to the pilot line.
CONVERSION FROM NATURAL TO LP GAS
l. Be sure gas and electricity to appliance is shut
off.
2. Disconnect pilot fecd tube from valve.
3. Remove the two screws holding valve to valve
bracket and pull valve with orifice holder back and
out of burner support exposing the orifice. Change
to burner orifice marked LP. found in the cloth
bag attached to the pilot line.
4. Reverse valve regulator pressure converter to
read LP Gas. See Fig. 6.
5. Push orifice holder back in place and replace
thc valve with the t\\'o screws previously removed.
Connect pilot feed tube to valve. Be sure all con-
nections are tight.
6. Wire LP identification tag to pilot line.
7. Store replaced orifice and Natural gas identifi-
cation tag in cloth bag and attach to pilot line.
8. Use pilot adjusting screw to adjust pilot flame.
See pilot adjustment.
CONVERSION FROM LP TO NATURAL GAS
l. Be sure gas and electricity to appliance is shut
olf .
Disconnect pilot feed tube lrom valve.
Remove the two screws holding valve to valve
bracket and pull valve with orilice holder back and
out of burner support exposing the orifice. Change
to burner orilice marked Nat. found in the cloth bag
attached to the pilot line.
INSTALLATION INSTRUCTIONS
4. Reverse valve regulator pressure converter to
read Nat. Gas. See See Fig. 5
5. Push orilice holder back in place and replace the
valve u'ith the two screws previously removed.
Connect pilot feed tube to valve. Be sure all con-
nections are tight.
6. Wire Natural gas idcntification tag to pilot line.
7. Store replaced orifice and LP gas identil'ication
tag in cloth bag and attach to pilot line.
8. Use pilot adjusting screw to adjust pilot flame.
Sce pilot adjustment.
THE 7660-528 BURNER
The 1660-528 burner is a mono-port type burner with
a stainless steel flame spreader mounted above the
burner port to spread the flame out nearer the walls
of the heat exchanger. Just inside the burner port is
a flame retainer that holds a portion of the gas flame
down around the burner port.
The flame should be slightly yellow while the furnace
is operating. The burner flame should not rumble or
roar like a blow torch (furnace receiving too much
combustion air). The air shutter adjustment may be
pushed in to provide more primary air and pulled out
to reduce the amount of primarl' air being delivered
to the burner flamc. This adjustment depends upon the
average winter temperature and thc geographical loca-
tion of the furnace.
2.
J.
a
ll

INSTALLATION INSTRUCTIONS
7660-575 HEAT EXCHANGER
The 7660-575 heat exchanger is constructed with
stainless steel balfles installed around its lowcr,
interior portion. This is to give greater protection
against burnout from continuous contact with the burner
flame. Located in the top area ol the heat exchanger is
a stainless steel baffle deflector to keep the direct
upflow of heat from coming into immcdiate contact
with the top of the heat exchanger. lt also slows the
rising heat down before it escapes up the l-lue.
REPLACING THE 7660.575 HEAT EXCHANGER
l. Turn off the electrical supply to the furnace.
2. Turn oll the gas supply to the f'urnace.
3. Disconnect the rooljack from the furnace.
a. Remove the screws from the roof jack hold-down
straps and slidc the combustion air pipe up out of
the way.
b. Remove the scrcw from the vent-pipe and slide
it up out ol the way.
4. Disconnect the fuel line at the union, next to the
gas control valve, and from the gas supply line
below the floor. Remove this section of pipe so that
the furnace can be removed later.
5. Detach electrical supply and thermostat wires from
the furnace.
6. Remove the lurnace blower at this time by (a) dis-
connecting the electrical leads from the blower,
(b) removing the screws from the lower side of the
angle that holds the blor.r'er to the furnace, (c) sliding
thc blower lorward out of the I'urnace and setting
it out of the way.
7. Remove the two panels from the coil cavity of the
furnace.
8. Remove the duct chute and duct connector from the
bottom of the furnace. Take the four screws out of
the top of the duct chute and lilt out.
9. Detach the lurnace straps, located at top, back
corners of furnace. l'rom the wall.
10. Remove the two nails or screws used to anchor
the furnace to the floor. Each anchor is located just
a lew inches back from the front corners of the base
of the furnace.
t2

l2
13.
14.
l5
l6
t8
INSTALLATION INSTRUCTIONS
ll. Slide the furnace out of the closet or alcove and
lay it on its btrck.
Rernove the nuts I'rom the studs around the flue
at the top of the furnace.
To remove the burner from the furnace, remove
the six screws from the plate behind the control
valve that lastens it to the furnace. 'filt the burner
end down out of the heat exchanger and withdraw
burner from combustion air tube.
Remove the nuts lrom the studs that are located
inside the combustion air tube and at its very back.
Remove the mid-panel that separates the upper
and lower areas of the furnace.
Remove the cover plate from the electrical control
box. Remove the two screws in the control box that
are located along the side nearest the furnace wall.
Remove the internal front panel of the lurnace by
removing the screws from around its sides. Lift
both the furnace's internal panel and the heat ex-
changer out of the furnace body.
Remove the screw from the view plate on the
internal panel and detach the panel from the heat
11.
exchanger.
19. lnstall the new heat exchanger, gaskets and other
lurnace parts by using the above procedures in re-
verse order.
20. Use the installation instructions lor correct pro-
cedure in re-installing the furnace.
AIR REQUIREMENTS
The proper operation of any Mobile Home furnace is
dependent upon satisfying the requirements for four
types of air.
l. Comhustion air As seen in the cut-a-way vlew
of the PRESIDENTIAL furnace, combustion air is
supplied to the burner through the roof jack. Down the
back of the furnace to an area below the combustion
chamber. Primary air for combustion is drawn into'
the venturi of the burner by the action of gas velocity
(aspiration) in the venturi. This air and gas mixture
is thoroughly mixed in the mixing chamber and
discharged upward against the flame spreader where
it is ignited by the pilot.
Combustion is completed with the addition of secon-
dary air around the outside of the burner into the
combustion chamber.
The hot products of combustion then rise in the heat
exchanger and pass to the outside through the flue
and roof jack. All combustion air is taken from the
outside resulting in a system referred to as sealed
combustion. See Figure 8 .
l3
Figure 8.

INSTALLATION INSTRUCTIONS
2. Cirt'ulating air - Warm air is distributed through
the duct system by the circulating blower located at
the top of the furnace. The operation of the blower
is controlled by the fan switch which senses the heat
inside the furnace. This is an automatic switch, lo-
cated inside the control panel.
3. Fresh air - Some coaches, due to location, may
have an excessive moisture problem. ln some cases
the moisture problem may be so bad that condensa-
tion may cause water spotted walls or ruined paint
jobs. When the air is warrn, the moisture in the
coach is invisible. Since warm air can hold more
moisture than cold air, air containing too much
water vapor condenses to form frost or water when-
ever it comes in contact with a cold surface. One of
the most common illustrations of visible condensa-
tion in the coach is the formation of water or frost
on the windows.
Cooking, washing, bathing, etc., all add moisture to
the air, and large amounts show up as condensation.
The small rectangular chute on the bottom of the
furnace brings in fresh air to the circulating blower.
The fresh air which is brought into the circulating
blower is then distributed as warm air through the
duct system. This cool outside air, after being
warmed, is capable of absorbing moisture, thus
helping to reduce condensation.
Return air The louvers on the top front of the
furnace admit return air. Return air must be pro-
vided back to the circulating blower in order to
provide air distribution. Do not enclose the lurnace
or otherwise obstruct these louvers. To 'do so will
cause the furnace to limit and go to pilot.
The Presidential furnaces are designed to give
superior air-handling capabilities. This results in an
air temperature rise of 165'F. compared to the
200'F. rise that the Solar Paks were designed for.
lf you use less than 200 square inches free area
return grille you are reducing the air flow across the
heat exchanger and just asking for service problems
resulting in high temperature cycling on heating.
To avoid operational problems on the 7660 furnace,
the 7660-5491 return air grille must be used. This
grille has 200 square inches of free area and the use
of less free area can result in operational problems.
4
Figure 9.
I
I
tl.
t4

INSTALLATION INSTRUCTIONS
FAN SWITCHES
'I'he furnace is equipped with one fan switch located
at the top of the control panel. This switch is a nor-
mally open switch that closes with a rise in tempera-
ture. The fan switch is a disc type switch that is
calibrated to close at 105', and open at 90o.
As in the case ol a limit switch, the temperature on the
fan switch does not necessarily mean that the air will
be the same temperature. A fan switch, due to its loca-
tion on the furnace, might actually start the blower at
an outlet air temperature that is above the calibrated
temperature.
The disc switches used are marked to indicate the tem-
perature at which the switch will open or close
and the type switch being used. For example, a marking
of Fl40-30 means that the switch is a fan switch set
to turn the blower on at l40o and shut of at ll0o
(140-30= I l0).
ELECTRICAL
TERMINALS
THRUST
EUTTON
BI.METAL OISC.: HOT
CIRCUIT CLOSED
FAN SWITCH
LIMIT SWITCHES
Each furnace is equipped with two limit switches. The
upper limit switch is located on the left side of the
blower housing in the blower compartment. The upper
limit shuts the furnace off in case the upper portion of
the furnace overheats. An overheating condition could
exist at the top of the furnace because of circulating
blower failure. electrical failure, or overfiring of the
furnace.
The lower limit shuts the lurnace olf in case of exces-
sive heat build up in the lower portion ol the furnace'
The lower limit switch is located at the bottom of the
control wiring box. Some common causes of overheating
in this region are restricted ducts, too many floor
registers closed, or restricted inlet, i.e. dirty filter,
clothes hanging near or over the inlet area.
The lower limit will automatically reset when the air
temperature has cooled down.
The disk thermoswitch is operated by the heating and
cooling of a bi-metal disk. Under "hot" conditions,
the bi-metal disk will snap inward thrusting the elec-
trical contacts open; thereby breaking the electrical
circuit. Upon cooling, the bi-metal disk will snap back
out and let the contacts close which will then let elec-
trical power pass through without interruption.
ELECTRICAL
MOVEAELE
CONTACT
BI.METAL DISC.. HOT
CIRCUIT OPEN Br-METAL OrSC. - COOL
crRcutT cLosEo
LIMIT SWITCH
MOVEABLE
CONTACT
MOVEABLE
CONTACT
BI.METAL DISC.-- COOL
CIRCUIT OPEN
l5

THERMOSTATS
Shown below are the two thermostats used with the
PRESIDENTIAL gas furnace.
Figure l0 shows the Camstat TlTH-180N heating only
thermostat. Figure ll shows the Camstat CB35-E-lF
sub-base which contains the cooling thermostat. The
combination heating cooling thermostat is obtained
when the TITH-180N heating thermostat is affixed to
the CB35E-l F sub-base. When connecting the ther-
mostat combination for heatinglcooling operation.
connect the thermostat wires to R, Y, W, and G tln the
C835E-l F sub-base. Figure 12 shows the internal
wiring of the camstat thermostat. The White Rodgers
heating/cooling sub-base is pictured in Figure l3
and Figure 14 shows the internal wiring for the White
Rodgers thermostat.
Figure 10. Camstat Heating Only Thermostat
Figure 12. Camstat lnternal Wiring
Figure 13. White Rodgers Thermostat
Figure 14. White Rodgers Heat/Cool
Thermostat Internal Wiring
E0t
r r<dat
l6
Figure 11. Camstat Cooling Sub-Base

ANTICIPATION
The operation of a low voltage thermostat based solely
on mechanical means, generally results in wide varia-
tions in temperature in the conditioned area whether the
application is for heating or cooling. To insure a more
precise control of area temperature, low voltage thermo-
stats contain heating and cooling anticipators.
In addition to improved room temperature control, heat
anticipation contributes to better air circulation. The
burner may cycle on and off several times during one
cycle of the fan. Since heat anticipators are powered
and effective only during the heating cycle, they are
placed in series with the control contacts. When the
contacts are closed, power is supplied to the heat
anticipator resistor.
MANUAL SWITCHING OPERATIONS
Generally, a sub-base used to control both heating and
cooling equipment will contain two switches, one
marked "FAN" and one marked "SYSTEM."
FAN SWITCH
ON Constant fan. The fan will run continuously re-
gardless of the thermostat demand.
AUTO The fan runs only as required by the system
operatlon.
SYSTEM SWITCH
HEAT - Heating system only, operates in response
to the thermostat.
OFF Heating system and cooling system both off.
COOL - Cooling system only, operates in response to
the thermostat.
CAL/TION: Care should always be taken in the align-
ment of the thermostat attaching screws, as they may
also serve as terminal connectors. If threads are
stripped, a poor electrical connection will result.
INSTALLATION AND SERVICE
l. A low voltage thermostat is a precision instru-
ment and should be treated as one. Care must be
used to insure a level installation with thermostats
using mercury bulbs.
2. Mount on a solid wall.
3. Locate the thermostat on an inside wall four to
five feet above the floor in an area free from drafts
and direct sunlight. Do not locate where directly
affected by lamps, fireplaces, appliances, or on walls
containing hot or cold pipes, ducts, chimneys.
4. Be sure anticipator matches or is adjusted to
match current (amp) draw of equipment being
controlled.
5. Make all wiring connections clean and tight'
lf a heating system has an improperly sized anticipator
and excessive heat is generated in the thermostat, the
result is a short "on" cycle. During periods when the
system is running close to its full capacity, more of the
heat sensed by the bi-metal is from the anticipator
than from room air; and the controlled area tempera-
ture will progressively decrease.
THERMOSTATS
Insufficient heat anticipation in a heating system results
in the bi-metal lagging behind the room temperature
change. This will cause longer "on" and longer "ofl'
periods with a resultant larger room temperature
varlatlon.
A common heating valve current draw is 0.4 amps,
and this should be matched on any adjustable antici-
pator. If the adjustable anticipator is set appreciably
higher, for example rJ.1 amps, it will increase the
room temperature variations by 3oF. or 4oF. and cause
longer running cycles.
For longer "on" periods, set the heat anticipation ad-
justment pointer at slightly higher amp value. For
shorter "on" periods, set the pointer at slightly lower
amp value. Move only t/q to /z scale division at a time.
(Never set the pointer at more than I % scale divisions
below the amp rating of the valve or relay current
rating.)
The anticipation function in a cooling thermostat is the
reverse of its heating application. The cooling antici-
pator is powered during the "ofl' cycle. As the room
temperature increases, heat is applied to the bi-metal
decreasing the time necessary for the bi-metal to close
the contacts. Excessive cool anticipator temperature
results in shorter "offl' periods, consequently, more
frequent cycling of the cooling equipment. Insufficient
anticipation in a cooling thermostat causes long "ofl'
and cycles resulting in larger temperature
variations in the room.
ANTICIPATION PROBLEMS
HEATING
SETTING TOO LOW
l. Excess anticipation "on" cycles too short.
2. Rapid cycling.
3. Small temperature swings from the setting with
a tendency to drop.
SETTING TOO HIGH
l. Insufficient anticipation cycles too long.
2. lnfrequent cycling.
3. Wide temperature swings from the set point with
a tendencl to lag.
COOI,ING
RESISTOR TOO SMALL
L Voltage too low.
2. Short "ofl' time.
3. Short "on" time.
4. Rapid cycling.
5. Temperature maintained closer to the set point
with a tendency to rise.
R'.S/.STOR TOO IARGE
l. Voltage roo high.
2. "Off'time too long.
3. "On" time too long.
4. Fewer "on" cycles.
5. Wide temperature swings from the set point with
a tendency to lag.
l7

LIGHTING INSTRUCTIONS
CAUTIOI,{: When lighting the furnace it is important
that steps I through 6 ol' the Lighting Instructions be
followed to purge the combustion chamber of any gas
that might be prcsent in the combustion chamber.
LIGHTING INSTRUCTIONS
l. Turn thermostatto its lowest setting.
2. Remove lurnace door.
3. Open inspection door.
4. Depress and turn the gas valve control knob to
"oFF."
5. Close main gas valve.
6. Wait l5 ntinutes.
CALITION: Since the gas valve in this furnace is a
step opening valve, the following procedure should be
used when lighting the Pilot.
7. Turn gas valve "ON".
8. lnsert match in lighter rod'
9. Turn gas valve control knob to pilot.
10. Depress control knob and light pilot.
I l. Keep dial depressed lor 60 seconds or until pilot
remains lit.
12. Replace inspection door.
13. Turn dial to "ON."
14. Replace furnace door.
15. Use the thermostat to cycle the burner "OFF" and
"ON" several times to bc certain that the burner
ignites properly.
16. Set the thermostat to the desired temperature.
This procedure will allow the gas valve to lunction
properly by permitting a minimum flow of gas to the
main burner at the start. The valve then will continue
to open gradually till iull flow is obtained.
SHUTDOWN INSTRUCTIONS
l. Set wall thermostat to lowest temperature.
2. TEMPORARY SHUI-DOWN: Turn gas valve dial
to pilot position.
3. COMPT-El-E SHUl'DOWN: Depress dial and turn
clockwise to "OFF."
4. Turn system switch to "OFF."
WIRING THE F'URNACE
Connect the I l5 volt 60 cycle leads to the "pigtails"
in the wiring box at the top ol the wiring panel. Secure
with tu,o wire nuts. Connect the low voltage wires to
the thern.rostat.
All electrical wiring within the furnace has been made
at the {'actory. All wirirtg contlected to the unit must
comply, with the National Elcctric Code and any appli-
cable local codes and regulations. A separate circuit
with a lused disconnect should be provided lrom the
main luse hox to thc furnace.
1'he wiring diagrams shown in figures 15, 16, 17, 18
and l9 present a visual picture of the various elec-
trical circuits to be found in the 7600 Gas Presidential
Furnaces.
Figures 20,21,22 and 23 show the low voltage wiring
for the various furnace, condensing units, and ther-
mostat combinations.
l8

ELECTRICAL CIRCUITS
FU RNACE
CASING
BLOWER CONTROL BOX
Atr
Wt
ALL MODELS
7600-700 SERIES
7600-800 sERlEs
FUR NACES
THIS VIEW SHOWS THE
HIGH VOLTAGE CONNECTION
TO THE FURNACE HIGH
VOLTAGE TERMINAL BLOCK.
Figure 15
UPPER BLOWER
AND
r\40TOR
L l\4 lT
WIBING BOX
FURNACE
CASING
HEATING ONLY
7600-700 SERIES
7600-800 sERlEs
FUR NACES
THIS VIEW SHOWS THE
LINE CONNECTION TO THE
HIGH VOLTAGE TERMINAL
BLOCK, AND HIGH VOLTAGE
BLOWEB MOTOB CONNECTIONS
FOR HEATING ONLY FURNACE
TBANSFORIV]ER
Figure 16 l9