42
correctly.
Humidifier is on.
Display shows the
humidifier is operating.
The heaters don't
operate while the
humidifier is on. Refer
to the section,
Environment Control
Settings, and check that
all control parameters
are set correctly.
DIP switches on MCP
are not set correctly.
After setting a
temperature set point
sufficiently higher than
room air, and waiting
one minute, the display
never shows any stage
of heating.
Refer to the section in
this guide, DIP Switch
Settings, and check that
the heaters are enabled.
Heaters are not on
because of loose or
broken wiring.
Display shows stage one
or stage two heating but
the heaters are not on.
Test for 24VAC at pin 27
of the MCP terminal
connector. Test at pin
30 only if stage two is
off. Test at both 30 and
33 if stage two is on. If
no voltage at pin 27 or if
voltage at each, check
back to system terminal
block and heater
contactors. If voltage at
pin 27 but, no voltage at
pin 30
Complaint
Problem
Symptom
Action
Or pin 33 if stage two is
on, replace the MCP.
7. System does not
humidify or does not do
so sufficiently.
Control parameters are
not set correctly or set
as expected.
System seems to
function okay
otherwise.
Refer to the section,
Environment Control
Settings, and check that
all control parameters
are set correctly.
Loose or broken wiring
in low voltage circuits or
bad MCP.
Display shows
humidification
operating but, the
humidifier is not on.
Test for 24VAC at pins 4
and 5 of the MCP. If no
voltage, check wiring
back to system. If volt-
age at pin 4 but not 5 or
vise-versa, replace the
Содержание CAG-30 Series
Страница 18: ...18 Figure 4 Typical Unit Field Piping Connection...
Страница 37: ...37 17 REFERENCE DOCUMENTS...
Страница 38: ...38...
