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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.

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