Reznor DV Operation Manual (for units built before August 2003) - Manual (Page 15)

Form O-DV/RDF/ADF, P/N 148385, Page 14
12. Gas Train (cont'd)
• Electronic Modulation
Gas Controls (cont'd)
FIGURE 25 -
Modulating Gas Valve
Option AG36 is a special application gas train that is designed for controlling
the environment of a paint booth operation. The system includes a Maxitrol
A1494 amplifier, discharge air temperature sensor, dual remote discharge air
temperature selector (drying selector 80-140°F and a spray selector 60-90°F),
and two switches to control the operation of the modulating gas valve.
• Electronic Modulation Makeup Air Gas Control Option
AG37
Amplifier,
P/N 133229
Selector,
P/N 133230
FIGURE 23 - Components
of the Gas Control System
used in Option AG36
designed specifically for
paint booths - controls are
mounted on a remote
console
Function: Control Option AG37 does
not have a duct sensor or amplifier. In-
stead, a Maxitrol A200 signal condi-
tioner is activated by a customer-sup-
plied input signal (either 4-20 milliamps
or 0-10 volt) to control the modulation
of the gas valve.
Maxitrol
A200 Signal
Conditioner,
P/N 134170
FIGURE 24 - Maxitrol
Signal Conditioner for
Computer Control
Makeup Air with Recirculation Air Gas Control Systems
• Electronic Modulation Makeup Air with Recirculation Gas
Control Options AG47, AG48, AG51
Refer to the wiring diagrams in the main electrical box to determine which
controls are on the system being serviced. NOTE: All field-supplied control
wiring for Maxitrol controls must not be run inside conduit with line voltage
wiring. To avoid any potential electrical interference, all field-supplied wiring
for Maxitrol controls should be shielded wiring and must be grounded at the
unit only.
Function: These makeup air with recirculation gas control systems provide a
mix of outside and recirculated air heated to a temperature controlled by a
discharge air sensor. Each system is equipped with electronic modulation con-
trols that modulate burner flame from 1/25th of full fire input to full fire and
adjust the outside air damper in response to outside and return air sensors.
Both the flow of the gas to the main burner and the outside (bypass) air damper
position are adjusted in response to DC volts emanating from an amplifier.
When the DC voltage is between 0 and 5 volts, the main valve seat is closed.
Low fire gas flow is accomplished through a mechanical bypass. Minimum
outside air is 25%. Carbon dioxide (CO
2
) in the discharge air of the unit is
maintained to a level in compliance with ANSI Z83.18 requirements.
For troubleshooting guides and further explanation of Maxitrol Series 14 and
44 electronic modulation gas control recirculation systems, refer to the Maxitrol
literature in the owner's envelope.
Option AG47 electronic modulation system is comprised of Maxitrol Series 14
controls for makeup air with recirculation. The system electronically operates
the burner and/or the outside air damper to maintain a constant discharge air
temperature in the range of 40-95°F.
OPERATION/SERVICE SECTION (cont'd)