Hayward ONCOM Installation Manual Download Page 7

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2. Plumbing

Pool/Spa system configuration

These systems use a single filter pump and filter. Pool or spa operation is controlled by two 3-way valves (suction

and return). Refer to the diagram below.

Some important notes regarding the OnCommand control of Standard Pool/Spa systems (refer to the Operation
section for more information):

In Pool/Spa Config., select:

Pool/Spa Setup

Pool and Spa

1. The OnCommand can be programmed to accommodate spa spillover, if desired.
2. A conventional heater (gas or heat pump) and solar can be used to heat both the pool and the spa.
3. If the chlorinator cell is plumbed prior to the pool/spa return valve, then both the pool and the spa can be

chlorinated (only when optional external chlorination is used).

4. The water sensor should be installed prior to any heater or solar and will display either the pool or the spa

temperature, depending on the current operation of the pool. The temperature will only be displayed when
the filter pump is running.

5. If any water feature or pressure side cleaner boost pumps are used, be sure to enable the “interlock”

feature (see “Configuration Menu” for details) to ensure that the pumps operate only when the filter pump
is on and the system is in the “pool only” operating mode.

6. The plumbing diagram above is intended to be used as a general guideline and is not a complete plumbing

schematic for the pool.

7. The air sensor must be installed if the freeze protection feature is enabled for the filter, valves or aux outputs

or if the chlorinator is enabled.

Aux1 Relay

This feature allows the user to select either “Standard” (default) or “Dimmer” type relay for the Aux1
output. The optional AQL-DIM dimmer kit must be installed if “Dimmer” is desired. When “Dimmer”
is selected, and the Aux1 output is manually turned on, the “+” and “-” buttons adjust the level from
20% to 100% (default). The level is saved for the next time the aux1 output is turned from off to on.

Aux1 Interlock

If “Enabled”, this feature will override the function (Manual On/Off, Countdown Timer, Timeclock),
selected above and turn the aux1 off when: filter pump is off, first 3 minutes of filter pump operation
(allows the pump to prime and get water flowing), when the pool/spa suction return valves are in any
position other than “pool only”, or for the first 3 minutes after solar turns on (allows air in the solar
panels to be purged). Interlock is not available for solar, low speed filter pump, super chlorinate,
dimmer or group.

Aux1 Group

The Aux1 Group function allows the user to perform multiple tasks with a single push of the “Aux1”
button. When setting up a Group function, refer to page 13 for specific programming information.
There are two Group menus; the first menu determines how the group command will be initiated
(Manual On/Off, Countdown Timer, or Timeclock) and the second menu selects the desired functions
and their respective control parameters.

Aux1 Freeze Protection

This function protects the pool, plumbing, and equipment against freeze damage. If Freeze Protection
is enabled and the AIR temperature sensor falls below the selected freeze temperature threshold, the
OnCommand will turn on the aux relay to circulate the water. IMPORTANT: this only enables
operation of the AUX output during freeze--see the “Filter Pump Config.” menu to enable freeze
protection for the main circulation system.

Aux1 Pump Speed

This is the speed of the pump when the Aux1 output is on. The choices are the Settings Menu speed
and a speed that is unique to the Aux1 output only. The default selection is “Settings Menu”. This
is the speed of the pump that has been selected in the Settings Menu for normal filter operation. If an
alternate speed is desired when the Aux1 output is on, push “+” or “-” and select from “Lowest” to
“Highest” in 5% increments.

FILTER

SOLAR BOOST

PUMP

SOLAR

VALVE

HEATER

BYPASS

VALVE

(manual)

CELL

FLOW

SWITCH