TC744-1
Page 4
350
300
250
150
100
50
180
10
40
70
100
130
160
C
F
POWERS
PROCESS CONTROLS
Skokie, Il.
Mississauga, Ontario
PRODUCT NO.
DA
TE CODE
ACTION
R
21
21
21
31
32
Front View of Cover
Air Operated
Water Operated
Section
“A–A”
*Used in Water-Operated Controllers Only
1/4
″
NPT to Drain (Water Operated Only)
1/8
″
NPT
Air Supply
1/8
″
NPT
Return
Reverse-Acting
Pivot
Direct-Acting
Pivot
A
A
19
18
17
10
11
*
12
13
15
16
20
13 (1/2
″
)
92
(3-5/8
″
)
73 (2-7/8
″
)
292 (11-1/2
″
)
40 (1-19/32
″
)
57 (2-1/4
″
)
Reverse Acting Spring Location
8
Reverse Acting
Spring Location
9
Water Operated
30
17
18
2
6
3
7
1
4
5
9
8
P
AR
TS LIST
1
Body
—
—
1
Brass
2
Cover Plate
744-170D
744-170D
1
—
3
Adjusting Knob
w/ Set Screw
744-234
744-234
1
—
4
Quad Ring
—
047-043
1
—
5
A
d
ju
st
m
en
t S
cr
ew
744-175
744-175
1
Brass
6
Stop Pin
744-061
744-061
1
Brass
7
Lever
—
—
1
Brass
8
Spring Retainer
Screw
744-124
744-124
1
Brass
9
Lever Spring
225-073
430-021
◆
1
Stainless Steel
10
Cover Screw
030-041
030-041
6
Brass
11
O-Ring
Not used
047-050
1
Silicone Rubber
12
Retaining Ring
100-124*
100-124**
1
Phos. Bronze
13
V
alve
744-155*
744-163**
1
Phos. Bronze
15
V
alve Spring
744-075*
744-075**
1
Phos. Bronze
16
V
alve Seat
744-063*
744-131**
▲
1
Phos. Bronze
17
Restriction
Screw
†
744-072
744-134
▲
1
Brass
18
O-Ring
047-049
●
047-045
1
Buna-N
19
Thrust Collar
—
—
1
Brass
20
Sensitive T
ube
Assembly
744-172
744-172
1
—
21
Lever Pivot
744-154
744-154
2
Stainless Steel
30
Insert
—
—
1
Stainless Steel
31
Sealing Screw
—
030-895
4
Stainless Steel
32
Gasket
—
744-083
4
Rubber
Part Numbers
No.
Item
Part
Name
A
ir
o
r G
a
s
W
ater
Req’d
Material
Part Numbers
No.
Item
Part
Name
A
ir
o
r G
a
s
W
ater
Req’d
Material
◆
(Pkg. of 10)
†
Also order O-ring (see item 18).
▲
Material is Stainless Steel
●
Material is Silicone Rubber
*
Included in V
alve and Seat Kit for Model 3 (Air
-Operated Accritem)
No. 744-168—parts are not available separately
.
**
Included in V
alve and Seat Kit for Model 3 (W
ater
-Operated Accritem)
No. 744-169—parts are not available separately
.
V
alve and Seat Kit for Model 3
(
Air
-Operated Accritem)
.........
744-168
V
alve and Seat Kit for Model 3
(
Wa
te
r
-Operated Accritem)
.....
744-169
Note:
Basic Accessor
y Kit No. 744-102 is included with each Accritem Controller but
is not shown. Parts included in Kit No. 744-102 are (two of each item are included):
1/8
″
NPT x 1-1/2
″
(38mm) lg. brass nipple
...................
Part No. 042-513
1-1/2
″
(38mm) pressure gauge 0–30 psi
.....................
Part No. 142-0308
1/8
″
NPT brass tee
.............................................
Part No. 043-351
PA
R
T
S
Dimensions:
Millimeters (Inches)
TC744-1
Page 3
The parts in Figur
e 7 ar
e identified by letter in or
der of disas-
sembly
. For item number r
efer
ence, see Parts Drawing:
A
(item 3) adjusting knob with set scr
ew
, B (item 10) cover
scr
ews, C (item 2) cover plate, D
(item 8) spring r
etainer
scr
ew
, E (item 9) lever spring, F
(item 21) lever pivot, G
(item
7) lever
.
Always locate the contr
oller as close as possible to the con-
tr
olled device. The piping between the contr
oller and
contr
olled device (valve or damper motor) should be 1/8
″
NPT
brass pipe or 6.4 mm (1/4
″
) OD copper tubing.
Dif
fer
ence in height between Accritem contr
oller and con-
tr
olled device should be kept to a minimum. When contr
oller
is
below
contr
olled device, elevation cannot exceed 3 m
(10
′
) with 104 kPa (15 psi) supply pr
essur
e. If contr
oller is
above
contr
olled device, adjust springs on valve or damper
motor to compensate for static head pr
essur
e.
PRESSURE CONTROLLER FOR USE WITH W
A
TER
Set pr
essur
e at 104–138 kPa (15–20 psi) when water is
flowing. Clean strainer at r
egular intervals.
BOTH AIR AND W
A
TER CONTROLLERS
T
o disassemble
(Refer to Parts Drawing and Figur
e 5):
1.
Remove knob (
) after loosening its set scr
ew
.
2.
Remove cover plate (
).
3.
Remove spring r
etainer scr
ew (
) and lever spring (
).
4.
Back out one lever pivot (
) and r
emove lever (
).
5.
Unscr
ew sensitive tube assembly (
) fr
om body (
).
T
o r
eassemble:
1.
Install new sensitive tube assembly (
) to body (
).
2
.
Install lever (
). Tighten the lever pivot scr
ews (
) as
requir
ed. The lever must be in the exact center of the
body and must move fr
eely but without side play
.
3
.
Install scr
ews (
) and gaskets (
) on water
-operated
contr
oller
.
4.
Install parts (
) and (
). (Note r
elationship for dir
ect and
reverse acting. See Figur
e 6.)
5.
Back out adjustment scr
ew (
) until collar (
) touches
the pivots on the lever (
).
6.
Install cover plate (
).
7
.
Install adjustment knob with set scr
ew (
). The knob
indicator (white line on side of knob) should be opposite
the dial marking corr
esponding to the r
oom temperatur
e.
Tighten the knob set scr
ew very firmly
.
8.
T
ur
n the adjusting knob to the desir
ed contr
ol tempera-
tur
e for appr
oximate calibration.
9.
Recalibrate as r
equir
ed after the contr
oller is installed and
connected to the supply and contr
ol lines.
NOTE:
On units with a date code of 3L48 and later:
When
replacing a knob (744-036) or cover plate (744-170), a new
knob (744-234) and cover plate (744-170D)
must be or
der
ed.
3
2
7
19
5
9
8
32
31
21
7
1
20
1
20
7
21
9
8
2
3
Figur
e 7.
Figur
e 6.
B
(6 screws)
C
A
G
E
F
(2 pivots)
REVERSE ACTING
SPRING LOCATION (behind lever)
8
DIRECT ACTING
SPRING LOCATION (in front of lever)
Lever
Spring
Retainer
Screw
Spring
Retainer
Screw
9
7
Lever
9
8
7
D
Summary of Contents for PVG WW
Page 2: ......
