Maxitrol Selectra - User Manual

Page 1 System Components
Page 2 & 3 Introduction and Dimensions
Page 4 Specications
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 for A1044 [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


Summary

Installation of Components

Wiring Run and Component Placement

Optional Remote Sensing Components

Selectrastat Installation

Typical Gas Trains

Modulator (M) and Modulator-Regulator (MR) Valves

Describes mounting position for M and MR valves in gas trains.

Field Service Checklist

Preliminary Circuit Analysis

Section I: Initial Voltage Checks

Tests initial DC voltage readings at amplifier terminals 6 & 7.

Section II: Amplifier Voltage Test

Verifies amplifier satisfactory operation with test potentiometer.

Section III: Burner Operation Test

Observes burner flame and pressure response to test potentiometer.

Section IV: Discharge Air Temperature Test

Checks delivered air temperature against MIN/MAX settings using TS144.

Low Fire Start Time Adjustment

A1044 U Low Fire Start Time Selection

Describes selecting 0, 10, or 20 second low fire start using jumpers.

Temperature Calibration

Minimum Discharge Air Temperature Calibration

Procedure to calibrate minimum discharge air temperature.

Maximum Discharge Air Temperature Calibration

Procedure to calibrate maximum discharge air temperature.

Space Temperature Calibration

Valve Adjustments

MR 212 Valve Adjustments

M411, 511, 611 Valve Adjustments

Maxitrol Selectra Specifications

General

Mounting	Wall
Accuracy	±1°F
Power Source	24VAC
Display	Digital
Temperature Range	50-90°F (10-32°C)