Gaymar MEDI-THERM II MTA5900 Series, Руководство по обслуживанию

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SERVICE MANUAL
Medi-Therm II
w
w
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aymar
.com P/N 10187-000 7/98
TROUBLESHOOTING CHARTS
*
*
**
Yes
No
Connect
hoses
properly.
Are
hoses
connected properly
(one to SUPPLY, one
to RETURN)
?
Disconnect
cold solenoid SV1.
Measure coil
resistance for
short.
No
Yes
No
Yes
No
No
Yes
Yes
Yes
Adjust setpoint
to insure HEAT
LED is on
Check/suspect
solenoids.
Second, suspect
control/display
board.
Repair/replace.
Test switch contact
opening before
reinstalling.
First, suspect
flow switch S5.
Repair/replace.
See
"PUMP
MOTOR
NOT
RUNNING"
(figure 6J).
Is
pump motor
running
?
Is flow OK?
See section 4.1
for minimum
values.
Test flow rate with
machine heating
and cooling.
Connect
test setup
as shown
in figure 13.
Is a steel object
attracted to center top of
the valve?
Yes No
Yes
No
Yes
No
No
No
Yes
Is pin
11 ref to pin
10 of U51
0 VDC?
Suspect
control/display
board.
Repair/replace.
Suspect
board-to-board
connection.
Repair.
Is
optocoupler U8
input pulled
low?
Suspect
base-to-power
supply board
connection.
Repair.
Line
voltage at
output of
Q8?
Line
voltage at
terminals 1
and 3 of
TB1?
Check
cold solenoid SV1
(it should be
energized).
Repair/replace
hot solenoid SV2.
Is
SV2 coil
energized
?
Adjust setpoint
to insure COOL
LED is on
Check
hot solenoid SV2
(it should be
energized).
Correct
occlusion.
Are
blankets, hoses
or connectors
pinched or
occluded
?
Replace
blankets,
hoses.
Are
blankets,
hoses excessively
dirty
?
CHECK WATER
FLOW
alert is on.
Figure 6I—Check Water Flow Alert is On, Page 1 of 2
48