Maxitrol A1093 User Manual
www.maxitrol.com
A1093 AMPLIFIER
TD92 TEMPERATURE DIAL
TS194Q SENSOR WITH MIXING TUBE
MODULATINING GAS VALVE
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11/04 MS2099
3
MODULATION
FOR USE WITH 2-STAGE BURNER SYSTEMS
asily turn a 2-stage indirect fired furnace into
a modulating furnace with Maxitrol’s
Series 3 electronic gas modulation system.
E
mance, a comfortable work environment, and precise control of discharge air temperature are just a few of the
advantages the Series 3 system has over a conventional
system.
Maxitrol Company originally designed the Series 3 system
for use with duct furnaces - additional applications include indirect makeup air heaters and commercial furnaces.
Heaters using atmospheric indirect fired gas burners are
typically used in both large and small industrial and commercial buildings. Any of these heaters with a 2-stage gas
valve and a 2-speed combustion blower is a candidate for
a Series 3 upgrade.
You’ll be glad you did. Improved perfor-
Such furnaces typically have a turn down that is 50% of
the high fire input. Converting to Maxitrol’s Series 3 system can reduce the turn down to 25%, or lower, of the
high fire input. By controlling the switch point of a relay
connected to the gas valve and inducer we are able to create
two separate modulation ranges.
A higher turn down allows you to accurately control the
discharge air temperature and significantly reduces the cycling of the heater, resulting in a consistent room temperature. This is especially true when you’re using multiple units with a large duct system (see example).
We also eliminate problems associated with lighting the
burner at the lowest gas input by providing an adjustable
timer and adjustable VDC output to the modulating valve
on start-up.
Many of the benefits of upgrading to the Series 3 modulation system are a direct result of the system’s ability to
obtain a higher turn down on atmospheric indirect-fired
applications.
SYSTEM REQUIREMENTS
Two-stage gas combination control. Low stage (flow) set approx. 50% of High stage (flow).
Two-speed combustion blower (inducer).
PRODUCT SPECIFICATIONS
Power Requirements
Ambient Limits
A1093 Dimensions
TD92 Dimensions
Valves
Sensor
Discharge Air Temperature Range
Combustion Blower and
Gas Valve Relay
The Series 3 system is used with Maxitrol’s industry leading Selectra modulator and modulator-regulator (M/MR)
valves. These unique electronic valves provide quick reaction times & offer continuous burner pressure adjustment.
24 VAC, 50/60 Hz Class II transformer
-40°F (-40°C) to 158°F (70°C)
7.5” x 3.4” x 1.9”
4.0” x 4.0” x 2.8”
M420, M520, M620 Series (one required)
TS194Q with mixing tube
TD92-0509: 50°F (10°C) to 90°F (32.2°C)
(Other temperature control ranges configured upon request.)
Normally Open 20 AMP maximum at 25°C
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Burner Light Off Adjustment
TYPICAL MANIFOLD PRESSURES
Position
High stage 2
Low stage 2
High stage 1
Low stage 1
Adjustable timer (0-30 sec) & adjustable VDC (5-15 VDC)
output to the modulating gas valve on startup.*
* Starts when power is supplied to amplifier.
Inlet
Pressure
(in. w.c.)
7”
7”
7”
7”
Outlet
Combination
Control
(in. w.c.)
3.6”
3.6”
1.0”
1.0”
Outlet
Modulator
(in. w.c.)
3.5”
0.7”
1.0”
0.2”
% of
Max
Input
100
45
55
25
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