M-Series Technical Manual
65
Cambridge Engineering, Inc.
GAS CONTROL SYSTEMS
Maxitrol Series 14
The Maxitrol Series 14 controls
electronically modulate the burner
input to maintain a selected dis-
charge temperature. The discharge
temperature is set on the amplifier
(AD1014) between 55°F and 90°F
with the standard controls. As an
option, the discharge temperature
can be set on a Remote Heat Adjust (TD114) control
between 55°F and 130°F. The Remote Heat Adjust con-
trol can be mounted in the heater control enclosure or in
the Remote Control Station.
Maxitrol Series 44
The Maxitrol Series 44 controls
electronically modulate the burner
input to maintain a constant space
temperature by increasing or
decreasing the discharge tempera-
ture. The Space Temperature
Selector (T244A) is set to main-
tain the space temperature of the
heated space by controlling the heater output between the
MIN and MAX setting on the amplifier. The MIN dial
setting determines the minimum discharge temperature
the heater will deliver (40°F to 80°F). The MAX dial set-
ting determines the maximum discharge temperature the
heater will deliver (80°F to 140°F)
Intermittent/Continuous Control
The Intermittent/Continuous Control allows the burner
input to be modulated to be operated continuously at
modulating discharge temperature for make-up air (see
Maxitrol 44 above) or operated intermittently based
on a thermostat at maximum discharge temperature for
space heating.
Requires Maxitrol 44 controls and a signal to switch
between modes (Exhaust Fan Interlock, Temperature
Setback System, Manual Make-Up Air Switch, etc.)
REMOTE CONTROL STATION COM-
PONENTS
Remote Control Station
The Remote Control Station is a lockable
NEMA 1 enclosure (9" wide x 14" high x
5" deep) equipped with a three position
key lock selector switch (Summer
Ventilation – Off – Heating) and indicat-
ing lights for blower operation (green),
burner operation (red), and reset (amber).
An auxiliary contact wired between terminals Z1 and
Z2 is required to control heater operation in the heat-
ing mode. This can be accomplished by an Exhaust
Fan Interlock, a Manual Make-up Air Switch, an
Operating Electronic Thermostat, etc.
IMPORTANT
A number of the components listed below can be
combined to yield a custom Remote Control Station
to address a wide variety of applications.
Maxitrol Series 14 Remote Heat
Adjustment Dial
The adjustment dial on
the remote heat adjust
(TD114) is either mount-
ed on the exterior of the
door of the Remote
Control Station or
mounted inside the
Remote Control Station
for tamperproof applications. The remote heat adjust-
ment control permits manual adjustment of the dis-
charge temperature from 55˚F to 90˚F. The override tem-
perature selector dial, visible from the top of the remote
heat adjustment control, increases the discharge tem-
perature above the setting on the dial face by the incre-
ment selected (10˚F to 40°F) when a jumper or switch
contact is provided across terminals 20 and 22.
Maxitrol 14 Space Temperature Override
The Maxitrol Series 14 with Space Thermostat control
system uses the Maxitrol Series 14 controls described
above along with an electronic space thermostat switch
contact to automatically increase the discharge tem-
perature.
