Install Instructions
CG
i
GAS-FIRED
wATER
BOILER-
sERIEs
a-
Boiler
Manual
lla
Troubleshooting - components
Troubleshooting
air
pressure
reading
I. If manometer reading is lower than the
se
tpoint
of
the s
wi
tch
(see
Table
9) - check
for
possible
causes:
blockage
in h
oses
obstruction in inducer housing outlet
l
oose
inducer
wheel
on motor shaft
inducer motor not in proper rpm
inducer
back
plate not
sealed
pr
operly
blockage
in
block
asse
mbly
6. If manometer
read
ing is above the
se
tpoi
nt
of the s
wi
tch
(
se
e
Table
9), but there
is
not24
VACbetween
both air pressure switch
termin
als-
replace air pressure switch.
Return
to
nonnal
operation
When
pressure reading is correct and air pre
ss
ure sw
itch.
is
operati
ng
properly- remove
tees
and reinst
aU
h
oses
to air pre
ss
ure
swi
tc
h.
Table 9
Pressure
sw1tch
setpo
lnt
(for
eleva
t
ion
s
above
2,000
ft.,
contact
your
l
ocal
Well-Mclain
sa
l
es
office for
deta
ils.)
Boiler model
number
CGi-25
and
CGi-3
CGi-4
CGi-5
CGi-6
and
CGi-8
CGi-7
Figure
36
Manometer
connect
i
ons
Whitb
Wh
i"?/R
ed
/i.· l
..
.
:\
"
1p
I
~\)
Side
~
lmcnor
POO
CI
1)(1
1
~
1
Part
Number
550-
1
42-780
/0712
lnchesW.C.
1.79
1.36
1.
12
0.80
0.75
Ave
co
llect
or
"'
"'
...
~
,
.....
Temperature
sensor
I.
The
b
oiler
temperature
sen
so
r is a resis
tance
·
type
dev
ice.
2.
The
Tabl
e 10, below sho
ws
the correct
va
lue for the s
ensor
at
var
i
ous
temperatur
es.
3.
Use
the
resistance
va
lues
at
32°F, 60°F,
70
°F
and
2 t 2°F
to
m
ea
s
ure
the
sen
s
or
resis
tance
at
known
temperatures
(ice
point
, ro
om
temperature a
nd
s
ea
level boiling
point).
For ice
point
and
boiling
poi
nt, i
nsert
the sensor in water
at
that
tern·
perature.
Use an
ohmmeter
to
read
resistance value between
thermister #and thermistor con
un
on
.
See
Figure
30,
page
50,
for sens
or
plug details.
Table
1 0
Sensor
res
i
stance
values
Sensor
resistance
values
Temp
Sensor
ohms
Temp
Sensor
ohms
rFl
Min
Max
("F)
Min
Max
32
34265
3787t
120
45t7
4992
40
27834 30764
130
3698 4088
50 21630 23907
140
3043 3364
60
16944 18727
150
2517 2782
70
13372 14780
160
2091 2311
80
10629 11747
170
1744 1928
90
8504 9399
180
1461 16
15
100 6847 7568
190
1229 1359
110 5545 6129
200
1038 1147
51