User Guide

Field Service Checklist
24
© Copyright 2007, Maxitrol Company. All Rights Reserved.
Observed Problem: Possible Cause: Remedy:
I.
Incorrect discharge
air temperature.
1. Incorrect wiring. 1. Check wiring
diagrams in MP2
Installation Guide
(pg. 6) and correct if
necessary.
2. System out of
calibration.
2. If sensed
temperature
(thermometer next
to TS194(Q)) does
not correspond
to MP2 setting.
See Calibration
Procedure on
(pg. 15).
3. Improper TS194(Q)
location.
3. If sensed
temperature does
not represent
average discharge
air temperature,
move TS194(Q)
to location
where average
representative
temperature can be
sensed.
J.
Burned out
transformer.
1. Short circuit in
modulator coil.
1. Measure resistance
across modulator
terminals with wires
disconnected.
Replace modulator
head if less than 40
ohms.
2. Short circuit
between amplier
and modulator
valve.
2. Inspect wiring.
Correct wiring if
short is found using
the wiring diagrams
in MP2 Installation
Guide (pg. 6).