Maxitrol Selectra User manual
Page 1 System Components
Page 2 & 3 Introduction and Dimensions
Page 4 Specications
Installation of Components
Typical Gas Trains
Page 5 Field Service Checklist
Page 6 Preliminary Circuit Analysis
Page 7 Wiring Diagrams
Sensitivity Adjustment
Low Fire Start Time Adjustment
Page 8 Temperature Calibration
Valve Adjustments
Table of ConTenTs
1
Series 44 Installation Instructions
© 2008 Maxitrol Company, All Rights Reserved
SYSTEM COMPONENTS
A1044U
A1044U (replaces all A1044L1, suitable re-
placement forA1044 [C,D,E,H]) (includes 0,
A1044UF (replacement for A1044FL1)
A1044UG (replacement for A1044G[L1])
NOTE:-
ture Sensor must have same temperature
Sensors compatible with A1044U:
Sensors compatible with A1044UF:
Sensors compatible with A1044UG:
speed blower or dual fuel operation)
NOTE: M (Modulator) valve requires an
-
tor) valve requires no upstream pressure
Selectrastat (Senses and Selects)
or optional pair to replace
Selectrastat
Space Temperature Selector
Space Temperature Sensor
NOTE:
-
perature Sensor must have
same temperature range to be
INTRODUCTION AND DIMENSIONS
-
A discharge air temperature sensor (and mixing tube) is a means
wall mounted Selectrastat senses space temperature and has an
2
© 2008 Maxitrol Company, All Rights Reserved
© 2008 Maxitrol Company, All Rights Reserved
Selectrastat, Temperature Selector, Space Temperature Sensor
without front dial)
4
© 2008 Maxitrol Company, All Rights Reserved
SPECIFICATIONS
(Maximum Fire)
Vent:
MR212-two vents located in upper housing, both equipped with
Optional:
Remote Temperature Selector:
Note:
Remote Temperature Sensor:
Remove cover to mount in area where representative space
Control wires connected to the Selec-
so may cause the unit to function erratically or may destroy the
Install in any convenient location that is protected from
Selectrastat: -
MR Valve: Modulator-
regulator valve
M Valve: Regulator upstream of
modulator valve
-
Suitable for application in natural, manufactured, mixed
SYMPTOM REMEDY
Continuous
-
Continuous Minimum
Continuous
Continuous
-
pressure setting and pressure drop of the valve (See Maxitrol Capacity
-
tion of equipment manufacture
about possibility of using special spring to reduce pressure drop on selected
Incorrect Space
Temperature
.
© 2008 Maxitrol Company, All Rights Reserved
faulty components, improper wiring or calibration, and other
Note:
Section I
Section II
If proper voltages are not observed, continue testing to identify
Section III
-
Note
© 2008 Maxitrol Company, All Rights Reserved
Section IV
-
sponding correctly, wire the system (see Figure 1 below),
If proper delivered air temperatures are observed, the prob-
Section V
-
OR
Model A1044U
Model A1044
© 2008 Maxitrol Company, All Rights Reserved
and separate temperature selector
SENSITIVITY ADJUSTMENT
If hunting is encountered (rapid oscillation), rotating the sensitivity
-
-
able between 0, 10, or 20 seconds, and begins timing after the
Sensitivity
VALVE: Green
20 Second
10 Second
0 Second
1
2
1
2
1
2
Maxitrol Company
©2008 Maxitrol Company
All Rights Reserved
8
Note:
minimum temperature setting is at least ten degrees higher than
Space Temperature
Because of the large space being heated, wait at least one half
-
NOTE:
-
B
A
1 2
A B
D
C
(See bulletin M/MR_MT_EN for additional M/MR valve information)
NOTE:
A1044
A
B
C
VALVE: Green
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1
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