May Manufacturing MVS504DZ User manual

Warm Light
Cool
Time
Mode / Prog Jets 1 Jets 2
Jets 3
Temp Control (80°F - 104°F / 26.0°C - 40.0°C)
The last measured water temperature is constantly displayed.
The water temperature displayed is current only when the
pump has been running for at least 2 minutes.
To display the set temperature, press “Warm” or “Cool” once. To
change the set temp, press a temp button again before the display
stops flashing. After three seconds, the display will stop flashing
and begin to display the current spa temperature.
Jets 1
Press “Jets 1” to turn pump 1 on or off, and to shift between low
and high speeds (if equipped). The low-speed will turn off after
4 hours. High-speed will turn off after 15 minutes. Low-speed
may run automatically at times, during which it cannot be
deactivated from the panel, but high-speed may be operated.
Jets 2/Jets 3 (If equipped)
Press the corresponding button once to turn the device on or off.
The device will turn off after 15 minutes.
Light
Press “Light” to operate the spa light. Turns off after 4 hours.
Setting the Time of Day
When the spa is first powered up, the words SET TIME will flash
on the display. Press “Time,” then “Mode/Prog,” then “Warm” or
“Cool.” The time will begin changing in one-minute increments.
Press “Warm” or “Cool” to stop the time from changing. Press
“Time” to confirm.
Initial Start-up
Your spa will enter Priming Mode ( ) when it is energized.
During Priming Mode, press “Jets” button(s) repeatedly and
be sure all pumps are free of air. Priming Mode lasts less than
5 minutes. Press “Warm” or “Cool” to exit. After Priming Mode,
the spa will run in Standard Mode (see Mode/Prog section).
May Manufacturing MVS504DZ-MGS504DZ Operation Guide
This document covers MVS504DZ and MGS504DZ with panel MAY800D.
Mode/Prog
Mode is changed by pressing “Warm” or “Cool,” then pressing
“Mode/Prog” button.
Standard Mode maintains set temperature and the STANDARD icon
will be displayed.
Economy Mode heats the spa to the set temperature only during
filter cycles. will display when water temp is not current, and
will alternate with water temp when the pump is running. The
ECONOMY icon will be displayed.
Sleep Mode heats the spa to within 20°F/10°C of the set
temperature only during filter cycles. will display when water
temp is not current, and will alternate with current water temp
when the pump is running.
Preset Filter Cycles
The first preset filter cycle starts at 8:00 AM and ends at
10:00 AM. The second preset filter cycle starts at 8:00 PM and
ends at 10:00 PM.
For non-circ systems, low-speed pump 1 and the ozone generator
(if installed) run during filtration.
For circulation systems, the circ pump and the ozone generator
(if installed) run during filtration and otherwise only as needed
to determine and maintain temperature. At the beginning of
each filter cycle, all other equipment will run briefly to purge
the plumbing.
Optional Filter Cycle Programming
You are not required to change the filter cycles, but if you wish
to, press “Time,” “Mode/Prog,” “Mode/Prog” within 3 seconds.
SET START FILTER 1 (AM) will appear. Press “Warm” or “Cool” to
reset the filter start time.
Press “Mode/Prog” to see SET STOP FILTER 1 and adjust the time
with “Warm” or “Cool” as done above. Press “Mode/Prog” to see
SET START FILTER 2 (PM) and proceed as above. Press “Mode/Prog”
to see SET STOP FILTER 2 and proceed as above.
Press “Mode/Prog” to confirm.
The pump responsible for heating and filtration (pump 1 low-speed
on non-circ system, or the circ pump on circ systems) will be
referred to simply as the pump.
In multi-button sequences, if the buttons are pressed too quickly in
the sequence, they may not register.

P/N MVS504DZ-MGS504DZ_80_A 06/27/2007
Warning! Shock Hazard! No User Serviceable Parts.
Do not attempt service of this control system. Contact your dealer or service organization for assistance.
Follow all owner’s manual power connection instructions. Installation must be performed by a licensed
electrician and all grounding connections must be properly installed.
No message on display.
Power has been cut off to the spa.
Temperature unknown.
“Overheat” - The spa has shut down.* One of the
sensors has detected 118°F/47.8°C at the heater.
“Overheat” - The spa has shut down.* One of
the sensors has detected that the spa water is
110°F/43.5°C.
Spa is shut down.* The sensor that is plugged
into the Sensor “A” jack is not working.
Spa is shut down.* The sensor that is plugged
into the Sensor “B” jack is not working.
Sensors are out of balance. If alternating with
spa temperature, it may just be a temporary
condition. If flashing by itself, spa is
shut down.*
A significant difference between temperature
sensors has been detected. This could indicate a
flow problem.
Persistent low flow problems. (Displays on the
fifth occurrence of message within
24 hours.) Heater is shut down, but other spa
functions continue to run normally.
Possible inadequate water, poor flow, or air
bubbles in detected in the heater. Spa is shut
down for 15 minutes.
Inadequate water detected in heater. (Displays on
third occurrence of message.) Spa is
shut down.*
“Ice” - Potential freeze condition detected.
* - Even when spa is shut down, some equipment will
turn on if freeze protection is needed.
Message
Meaning Action Required
Diagnostic Messages
The control panel will be disabled until power returns. Spa settings will
be preserved until next power up.
After the pump has been running for 2 minutes, the current water
temperature will be displayed.
DO NOT ENTER THE WATER. Remove the spa cover and allow
water to cool. Once the heater has cooled, reset by pushing any button.
If spa does not reset, shut off the power to the spa and call your dealer or
service organization.
DO NOT ENTER THE WATER. Remove the spa cover and allow
water to cool. At 107°F/41.7°C, the spa should automatically reset. If
spa does not reset, shut off the power to the spa and call your dealer or
service organization.
If the problem persists, contact your dealer or service organization.
(May appear temporarily in an overheat condition).
If the problem persists, contact your dealer or service organization.
(May appear temporarily in an overheat condition).
If the problem persists, contact your dealer or service organization.
If the water level is normal, make sure all pumps have been primed. If
problem persists, contact your dealer or service organization.
Follow action required for message. Heating capability of the spa will
not reset automatically; you may press any button to reset.
If water level is normal, make sure all pumps have been primed. Press any
button to reset. This message will reset within 15 minutes. If problem
persists, contact your dealer or service organization.
Follow action required for message. Spa will not automatically reset.
Press any button to reset manually.
No action required. All equipment will automatically activate regardless
of spa status. The equipment stays on 4 minutes after the sensors
detect that the spa temperature has risen to 45°F/7.2°C or higher. An
optional freeze sensor may be added to protect against extraordinary
freeze conditions. Auxiliary freeze sensor protection is advisable is colder
climates. See your dealer for details.
Locking the Panel
Press “Time,” “Jets 1,” and “Warm” within 3 seconds. All
buttons are disabled except the “Time” button.
To unlock the panel, press the “Time,” “Jets 1,” and “Cool”
within 2 seconds.
Locking the Temperature
Press “Warm,” “Time,” “Jets 1,” and “Warm” within 3 seconds. The
“Warm” and “Cool” buttons are now disabled.
To unlock the temperature, press “Time,” “Jets 1,” and “Cool” within
2 seconds.