How to Set an Analog Pool Timer
Step-by-step instructions for setting an analog pool timer, including tripper pin placement, on/off configuration, and common mistakes to avoid.
Analog pool timers have been the standard for controlling pool pump run times for decades. They’re simple, reliable, and inexpensive — but if you’ve never set one before, the dial and tripper pins can be confusing. Here’s how to set one correctly.
What Is an Analog Pool Timer?
An analog pool timer is an electromechanical clock that controls when your pool pump turns on and off. The timer has a 24-hour dial that rotates slowly (one full revolution per day), and small metal or plastic tabs — called tripper pins or “dogs” — that physically flip a switch as the dial rotates past them.
The most common brands in residential pool equipment are Intermatic and Precision. The setup is essentially the same for both.
Anatomy of the Timer
Before you start setting it, understand the parts:
- Timer dial — The round clock face, marked in 15-minute or 30-minute increments over a 24-hour cycle
- Tripper pins (dogs) — Small metal tabs around the perimeter of the dial. They can be pulled out, pushed in, or repositioned
- On/off switch lever — A small lever or switch on the timer housing that the tripper pins engage as they rotate past
- Manual override — Usually a lever or slider that lets you run the pump outside the programmed schedule
- Clock set knob/arrow — An arrow or indicator on the dial showing the current time
Step-by-Step Setup
Step 1: Set the Current Time
Locate the arrow or pointer on the timer dial. Rotate the dial clockwise only (never counterclockwise — it can damage the gear mechanism) until the arrow points to the current time of day.
Make sure you’re reading the dial correctly — most analog pool timers use a 24-hour format or have AM/PM markings. 2:00 PM is not the same position as 2:00 AM.
Step 2: Determine Your Pump Schedule
Before touching the tripper pins, decide when you want the pump to run. Key considerations:
- Total run time — In Phoenix during summer, most pools need 8–12 hours of pump run time per day. In winter, 4–6 hours is often sufficient.
- Time of day — Running the pump during off-peak electricity hours (typically before 3 PM and after 8 PM with most Arizona utility rate plans) saves money. Many pool owners run the pump overnight or in early morning.
- Single vs. split schedule — Some owners prefer one continuous run (e.g., 10 PM to 8 AM). Others split it into two runs (e.g., 6 AM to 10 AM and 6 PM to 10 PM).
Step 3: Set the Tripper Pins
The tripper pins control when the pump turns on and off:
- ON pins — Pull these pins outward (away from the center of the dial). When a pulled-out pin reaches the switch lever, it turns the pump on.
- OFF pins — Push these pins inward (toward the center). When the dial rotates past the last pulled-out pin, the switch lever drops and the pump turns off.
For a simple schedule — pump on at 10:00 PM, off at 8:00 AM — pull out every pin between 10:00 PM and 8:00 AM, and push in every pin outside that range.
Each pin typically represents 15 minutes. So between 10:00 PM and 8:00 AM, you’d pull out 40 pins (10 hours x 4 pins per hour).
Step 4: Test the Schedule
After setting the pins, use the manual override to turn the pump on and verify it runs. Then switch back to auto/timer mode. Over the next 24 hours, confirm the pump turns on and off at the programmed times.
Step 5: Adjust Seasonally
Your pump schedule should change with the seasons:
| Season | Recommended Run Time | Notes |
|---|---|---|
| Summer (May–Sep) | 8–12 hours | Higher temps, more chlorine demand, more debris |
| Fall (Oct–Nov) | 6–8 hours | Transitional, trees dropping leaves |
| Winter (Dec–Feb) | 4–6 hours | Lower temps, less demand |
| Spring (Mar–Apr) | 6–8 hours | Pollen and seed pods increase debris load |
Revisit the tripper pins at least at the start of each season.
Common Mistakes
Running the Timer in “Manual On” Permanently
The manual override is for temporary use — testing or running the pump outside the schedule. If left in manual, the pump runs 24/7, wasting electricity and adding wear to the motor.
Setting the Clock Incorrectly
If the time arrow doesn’t match the actual time, your entire schedule shifts. After a power outage, the clock stops. You’ll need to reset it manually — analog timers have no battery backup.
Rotating the Dial Counterclockwise
The internal gear mechanism is designed for clockwise rotation only. Forcing it backward can strip the gears and require timer replacement.
Not Adjusting for Daylight Saving Time
Arizona doesn’t observe daylight saving time — but if your timer was set by someone from out of state or after a power outage, double-check that the current time is correct.
Ignoring Broken Tripper Pins
Over time, pins can break, bend, or lose their spring tension. If your pump schedule seems erratic, inspect the pins for damage. Replacement pin kits are inexpensive and widely available.
When to Upgrade to a Digital Timer
Analog timers work fine for basic single-pump schedules. Consider upgrading to a digital timer or automation system if:
- You have a variable-speed pump that benefits from multiple speed settings at different times
- You want precise scheduling with battery backup
- You’re adding a second piece of timed equipment (pool cleaner booster pump, water feature, lights)
Have questions about your pool equipment setup? Contact Splash Mob Pools — we service and install pool timers, pumps, and automation systems across the Phoenix metro.
