Reznor ADFH Operation Manual - Manual (Page 13)

Form O-ADF/RDF, P/N 148385R2, Page 13
• 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
Maxitrol
Signal
Conditioner,
P/N 134170
FIGURE 24 - Maxitrol
Signal Conditioner for
Computer Control
Function: Control Option AG37 does not
have a duct sensor or amplifier. Instead, a
Maxitrol signal conditioner is activated by a
customer-supplied input signal (either 4-20
milliamps or 0-10 volt) to control the modula-
tion of the gas valve.
Makeup Air with Recirculation Air Gas Control Systems (RDF only)
• Electronic Modulation Makeup Air with Recirculation Gas Control
Options AG47, AG48, and 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 controls 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 posi-
tion 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 elec-
tronic 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.
FIGURE 25 -
Modulating Gas
Valve - Options
AG47 and AG48
FIGURE 26 -
Maxitrol Series
14 Components
used in
Recirculation
Air Gas Control
Option AG47
Return Air Sensor,
P/N 204452
Outside Air Sensor,
P/N 204452
Amplifier, P/N 204454
Selector,
P/N 204455
Discharge
Air Sensor,
P/N 204453
Option AG48 electronic modulation system is comprised of Maxitrol Series 44 controls
for makeup air with recirculation. The low limit (20-60°F) and the high limit (60-140°F)
for control of discharge air temperature are set at the amplifier. The space tempera-
ture is set at the remote selectrastat (55-90°F range) located in the space. When the
temperature is below the space temperature setpoint, the control system operates the
burner and/or the outside air damper to automatically adjust the discharge air tempera-
ture within the maximum and minimum limits set on the amplifier.