Davey Spa Power SP800, User Manual

Page: 31 / 44

31
7.9.1 Heat Control
In addition to Set Temp the user may also select one of four heat control settings. The Set Temp determines
the maximum temperature before the spa will stop heating the water, whereas the heat control setting
determines how far the temperature must drop before heating resumes again. In other words, the Heat
Control setting determines how closely the spa will maintain the pool temperature to the set temperature.
The four available settings are as follows:
1. TIGHT 0.25 2.50
2. NORMAL (default setting) 0.50 3.00
3. LOOSE 0.75 3.50
4. EXTRA LOOSE 1.00 4.00
The numbers associated with each setting in the table reflect the actual decrease in pool temperature
below the set point before heating will begin (hysteresis). Two sets of values are listed: 0.25 - 1.00 and
2.50 - 4.00. Generally the first set is used, however if you do not have an in-pool temperature sensor
or 24 hour circulation pump fitted the second set will be used instead.
There is a direct compromise between how often the spa cycles on/off and how closely the
temperature is maintained to the set temperature. Using the “tight” setting will maintain the temperature
very closely to the set temperature but in doing so it will also cause the spa to cycle on/off frequently.
Conversely, using the “extra loose” setting will cause a larger variation in pool temperature but the spa
will cycle much less frequently.
Exactly how often the spa will cycle on/off at each setting is a complex function of ambient conditions
and the thermal characteristics of your spa - set temp, spa body insulation, cover insulation, heater
rating etc. It is recommended that you start with the default “normal” setting and only change to
another setting if you would prefer a different compromise of cycling frequency and temperature
variation.
7.9.2 Changing the Heat Control Setting
1. Select the ADV. OPTIONS submenu from the main menu.
2. Select the HEAT CONTROL menu item.
3. Press the SCROLL button to begin heat control setting selection.
4. Use the UP and DOWN buttons to select heat control setting (refer table).
5. Press the SCROLL button to confirm the current setting and return to the ADV. OPTIONS submenu.
Notes
1. When the pool is in use the hysteresis is automatically limited to a maximum of 0.50 degrees
Celsius to ensure the water doesn’t get too cold.
2. The start of a filtration cycle will always trigger heating if the temperature is below the set point
regardless of the heat control setting.
7.9.3 Heat Pump
The Davey SP800 and SP800 Controllers are fitted with heat pump connectivity to control your heat
pump as a heating or cooling device. If a heat pump is fitted, the options for heating and cooling are:
HP HEAT ONLY Only the heat pump will operate - in heating mode (default option).
HP COOL ONLY Only the heat pump will only operate - in cooling mode.
ELEMENT ONLY Only the heating element will operate.
HEAT BOOST* Both the heat pump and heating element will operate – in heating mode.
* Heat boost mode is only available on single phase connections.
Once the heat pump settings are set on the spa controller, the heat pump itself must be set to the