Selectra Series 92

Selectra Series 92
Series 92
Electronic Gas Modulation System
DESCRIPTION
SYSTEM COMPONENTS
The Selectra Series 92 system is used to obtain higher turndown
on indirect fired applications.
SERIES 92 Amplifier
Selectra systems maintain stable, precise temperatures. A
significant improvement over mod motors and butterfly valves
- M/MR valves provide instantaneous response and continual
pressure adjustment.
A1092
Modulator Valves
The TD92-0509 remote temperature dial controls a 50° to 90°F
range. It is similar in design to our popular TD94, but with no digital
readout. It has a 6-place terminal block for lead connections. The
A1092/A1192 amplifier functions similarly to an A1094, but uses
standard wires (4) to connect to the TD92 instead of ribbon cable.
Maximum recommended wire length is 300ft.
Pipe Sizes:
M420........................3/8” & 1/2”
M520........................1/2” & 3/4”
M620.........................3/4” & 1”
Duct temperature sensing is by 1,000 ohm RTD such as TS3943B-48FQ or TS194Q (w/mixing tube).
Remote Temperature Selector
An optional T115 room override thermostat, when used in
conjunction with the remote temperature selector, provides space
temperature control by raising the discharge air temperature to a
pre-selected point.
TD92-0509 - (50° to 90°F)
Upon request, Maxitrol can configure Series 92 components for
other desired temperature control ranges.
Discharge Temperature Sensors: use with Mixing Tube
SPECIFICATIONS
TS194Q
Pressure Limits for M420, M520, M620
Maximum Discharge Pressure............................7” w.c. (1.7 kPa)
Maximum Operating Inlet Pressure......................1.0 psi (7 kPa)
Maximum Emergency Exposure*...........................3.0 psi (21 kPa)
*May not function properly at this pressure, but will suffer no
internal damage.
Mixing Tubes: use with Sensor
Lengths:
MT1-9 or 2-9........................9”
MT1-12 or 2-12 ................. 12”
MT1-23 or 2-23 ................ 23”
MT1-28 or 2-28 ................. 28”
MT1-57.............................. 57”
Power Supply
A1092: Independent 24 VAC, 40VA, 50/60 Hz Class II transformer
A1192 Independent 24 VAC, 100VA, 50/60 Hz Class II transformer
NOTE: Transformer must have sufficient rating to cover amperage
load.
Temperature Sensor
Gases
Suitable for natural, manufactured, mixed gases, liquified
petroleum gases, and LP gas-air mixtures.
TS394-3B-48FQ
Vent
M420, M520, M620: Vertical vent outlet 1/8” NPT - 12A06 installed
NOTICE
OPTIONAL: Room Override Thermostat
Maxitrol vent limiting devices eliminate the need to run vent
piping to the outside. Vent limiting devices are designed for
use indoors and in spaces where limiting the amount of gas
escapement due to diaphragm failure is critical. Vent limiting
devices should not be used outdoors if they are exposed
to the environment. Vent protector 13A15 is available for all
outdoor applications to ensure proper vent protection.
© 2012 Maxitrol Company, All Rights Reserved.
T115
1
Series 92 Electronic Gas Modulation System
SPECIFICATIONS (cont.)
Ambient Limits
Operating:
Non Operating:
VALVE ADJUSTMENT
See Bulletin MMR_MT_EN for additional M/MR valve information
32° to 131°F (0° to 55°C)
-4° to 158°F (-20° to 70°C)
NOTE: Low Fire Adjustment should be checked whenever High
Fire Adjustment is changed.
Modifications
Models M420, M520, M620 are available as “W” models indicates covered wire terminal connections.
High Fire Adjustments
Rotate selector dial to maximum temperature setting.
Models M420, M520, M620 are available with side pressure
tap for reading outlet pressure - on side opposite of minimum
adjustment mechanism.
NOTE: Voltage to the valve must be at least 18VDC.
Valve Mounting
Valve must be mounted in upright position in horizontal pipe run,
downstream of all other controls except high pressure cut-off
switch if used.
Low Fire Adjustments
Disconnect a wire from M valve terminal block.
Adjust separate pressure regulator to obtain desired manifold
pressure.
NOTE: Be careful not to allow wire to come in contact with any
other part.
Remove by-pass cap (A) and turn screw (B) using small
screwdriver to desired low fire adjustment. (See Figure 1)
Optional T115 Room Override Thermostat
As an optional component, an independent room override
adjustment can be provided to permit setting of the override
temperature from 0° to 40°F above the TD92 setpoint. The
T115 override thermostat senses room temperature and resets
the discharge air to a higher temperature whenever the sensed
temperature falls below the T115 setting.
NOTE: Clockwise Screw rotation reduces flow rate. Do not
overtighten.
The standard configuration is to connect the T115 override
thermostat to the TD92 remote temperature dial. In some cases
it may be more convenient to connect the T115 to the A1092
amplifier. The T115 may be connected directly by removing the
jumper on the amplifier’s input terminal block and connecting
the T115 in its place. The jumper must then be installed across
the TD92’s override terminals for proper operation. See Wiring
Diagrams (Figures 2 - 8).
B
A
© 2012 Maxitrol
Figure 1: Valve Adjustment
WIRING DIAGRAMS
JUMPER NOT REQUIRED ACROSS
TERMINALS 11 & 12
Figure 2: Standard Connection of A1092 without Override Thermostat
© 2012 Maxitrol Company, All Rights Reserved.
2
© 2012 Maxitrol
Series 92 Electronic Gas Modulation System
WIRING DIAGRAMS (cont.)
JUMPER REQUIRED ACROSS
TERMINALS 11 & 12
© 2012 Maxitrol
Figure 3: Standard Connection of Override Thermostat to A1092
JUMPER REQUIRED ACROSS
TERMINALS 5 & 6
© 2012 Maxitrol
Figure 4: Optional Connection of Override Thermostat to A1092
© 2012 Maxitrol
© 2012 Maxitrol
Figure 5: A1192 Independent Power Supply
Figure 7: A1092 Independent Power Supply
© 2012 Maxitrol
© 2012 Maxitrol
Figure 6: A1192 Common Power Supply
© 2012 Maxitrol Company, All Rights Reserved.
Figure 8: A1092 Common Power Supply
3
Series 92 Electronic Gas Modulation System
DIMENSIONS
1.69
1.69
(59.8)
(43)
TYP.
TYP.
1.41
1.41
(49.9)
(36)
TYP.
TYP.
in. (mm)
in. (mm)
2.96
2.96
(75)
(105)
TYP.
TYP.
80
90
4.00 SQ.
(102)
70
°F
60
40
4.68
4.68
(165.7)
(119)
TYP.
TYP.
50
3.46(122.5)
(88)
3.46
3.25
3.25(115.1)
(83)
R
50
60 70 80
90
2.56
2.56
(90.6)
(65)
TYP.
TYP.
© 2012 Maxitrol
Figure 9: TD92-0509
© 2012 Maxitrol
Figure 10: Optional T115 Room Override Thermostat
in. (mm)
TYP.
1.89 TYP.
2.25
(57)
(57.2)
(48.0)
(48)
3.00
(76)
(76.2)
8
5
6
7
4
9
R
3
10
2
A1092
11
1
12
3.38
3.38
(86)
(85.9)
CENT.
CENT.
7.50
(191)
(190.5)
9.50
(241)
2.71
2.71
(69)
(68.9)
TYP.
1.75TYP.
1.75
2.75
2.75 (44.5)
(45)
(69.9)
(70)
CENT.
CENT.
5.55
(141)
CENT.
CENT.
R
A1192
2.75
2.75
(70)
(69.9)
TYP.
TYP.
1.25
1.25
(32)
(31.8)
TYP.
TYP.
8.00
8.00
(203)
(203.2)
TYP.
TYP.
.75
.75
(20)
(19.1)
TYP.
TYP.
© 2012 Maxitrol
Figure 11: A1092
Valve Dimensions
Dimensions
Model
Number
Swing
Radius
A
B
C
D
M420
3.1”
(79 mm)
3.9”
(100 mm)
2.0”
(51 mm)
2.1”
(54 mm)
0.9”
(24 mm)
M520
4.3”
(109 mm)
5.3”
(135 mm)
3.25”
(83 mm)
3.4”
(86 mm)
1.2”
(30 mm)
M620
5.7”
(146 mm)
7.1”
(180 mm)
3.9”
(99 mm)
4.0”
(102 mm)
1.5”
(37 mm)
NOTE: Dimensions are to be used only as an aid in designing clearance for
the valves. Actual production dimensions may vary somewhat from
those shown.
Maxitrol Company
23555 Telegraph Rd., P.O. Box 2230
Southfield, MI 48037-2230 U.S.A.
SEL92_MS_EN_07.2012
4
A
B
D
C
© 2012 Maxitrol
Figure 12: M420, M520, AND 620 Modulating Valves
www.maxitrol.com
© 2012 Maxitrol Company,
All Rights Reserved.
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