Wilo Z 15+ User manual

Installation and Operating Instructions
Wilo Z 15+
Timed and Constant Temperature Circulating Pump
WILO_IOM_Z15
+_0821

Warning

Please read over the operating manual prior to installation and keep it for reference.
The main electrical connection to the pump must be grounded before use.
It is strictly prohibited to touch the electrical connections of the pump while the pump
is in operation.
It is strictly prohibited to run the Z 15+ pump without water.

Contents
I. MODEL DESCRIPTION ............................................................................................................................................... 1
II. TECHNICAL PARAMETERS ....................................................................................................................................... 2
III. INSTALLATION PRECAUTIONS................................................................................................................................ 2
IV. HOW TO USE (applies to models with timer only; models without timer, skip to SECTION V. FAULT ANALYSIS
AND ELIMINATION)...................................................................................................................................................... 4
V. FAULT ANALYSIS AND ELIMINATION....................................................................................................................... 6

Z 15+ - Timer Type Circulation Pump
Version 21.07
1
Please read over the operating manual prior to
installation and keep it for reference.
Thank you for choosing the WILO® Z 15+ domestic hot water recirculator pump. Please read over
the operating manual prior to installation and keep it for reference.
Warning
The pump must be electrically grounded before use.
It is strictly prohibited to touch the electric components of the pump while powered and in
operation.
It is strictly prohibited to run the pump without water.
Warning about children
It is strictly prohibited for children to use the product unless they are under the supervision of
an adult.
Warning about pressure
The system pressure must be less than the maximum pump pressure to operate properly.
Warning about modifying the pump without manufacturer’s knowledge
The manufacturer bears no liability for any consequences caused by the user’s unauthorized
changes to the electrical schematic of the pump or physical changes beyond its original
construction or design.
I. MODEL DESCRIPTION
Z 15 + WITH TIMER .75 - 9 - 5.5
Maximum flow in US Gallons per Minute
Maximum Head in Feet
Size of pump inlet and outlet in inches
Pump Model: Z 15+ WITH TIMER OR
Z 15+ WITHOUT TIMER
Please read over the operating manual prior to
installation and keep it for reference.

Z 15+ - Timer Type Circulation Pump
Version 21.07
2
Please read over the operating manual prior to
installation and keep it for reference.
II. TECHNICAL PARAMETERS
Product model: Z 15+
Maximum flow: 5.5 US Gallons per Minute
Rated voltage: 115V Protection class: NEMA 12
Rated frequency: 60Hz
Maximum operating pressure: 145 PSI
2
Max. input power: 30W
Maximum water temperature: 160°F1
Max. input current: 0.26A Inlet thread: ¾” Female NPT
Max. Head: 9 Ft.
Low Lead Standard: NSF-61 Listed
Outlet thread: ¾” Male NPT
Pump Weight: 5.5 lbs
Notes: 1. The minimum temperature of the water must be greater than 32°F, and the maximum temperature is
160°F.
2. The inlet (supply) pressure must be higher than .75 PSI to work properly.
III. INSTALLATION PRECAUTIONS
For best performance and reliability, please follow the instructions in this manual.
Schematic diagram of a domestic hot water system
Step 1: Carefully check system components to ensure that the components are not missing or
damaged.
The circulating system should include:
One circulating pump with, or without, timing function (provided by WILO)
Installation and operation instructions (provided by WILO)
Jet valve (provided by WILO as an optional accessory)
Four 3/8” braided hoses (provided by others)
Water
pump
Hot
water
pipe
Cold
water
pipe
Temperature
-sensing valve
Angle valve

Z 15+ - Timer Type Circulation Pump
Version 21.07
3
Please read over the operating manual prior to
installation and keep it for reference.
Step 2: Turn off the power to the water heater and isolate the cold-water supply to water heater;
open the hot water tap in the house and wait until the residual water is drained out.
Step 3: Install the water pump at the hot water outlet of water heater; connect the outlet of water
pump to the hot water pipeline. Confirm the pumping direction through the arrow on the side of
pump case, and the installed water pump shall be kept away from exhaust/gas lines. Make sure to
insert the supplied gasket into the union end connection of the pump to ensure a leakproof seal.
Step 4: Reopen the cold-water supply to the water heater and close the furthest faucet when the
pipeline is filled with water to exhaust the air completely; power on the water heater and the water
pump.
Step 5 (applies to models with timer only): Set the timing function of water pump to make it operate
in the peak period of hot water use. (e.g., 15-30min before taking a shower)
Step 6: Close the cold and hot water angle valves below the tap, and observe the signs of cold water
inlet/outlet and hot water inlet/outlet of the temperature-sensing bypass valve; use braided hoses
to connect the cold water angle valve and the “COLD IN” of valve, connect the hot water angle valve
and the “HOT IN” of the valve, connect the “COLD OUT” of the valve and the cold water end of the
tap, and connect the “HOT OUT” of the valve and the hot water end of the tap; open the hot water
angle valve and the cold water tap to check whether the valve operates normally (if the water runs
out from the cold water tap normally and becomes warm, and the water flow becomes small slowly
until it stops, it indicates that the valve operates normally); close the tap and open the cold water
angle valve.
Note: 1. To obtain the best circulating results, the valve shall be installed below the tap the farthest
away from the water heater; if there are branch hot water pipes in your house, more than one valve
may be needed. 2. There may be some warm water in the cold water pipeline connected with the
valve, and warm water will dissipate soon when the cold water tap is opened.
Outline dimensions of the product*
*Pump pictured with timer

Z 15+ - Timer Type Circulation Pump
Version 21.07
4
Please read over the operating manual prior to
installation and keep it for reference.
Performance parameters of the product
Function overview
Function name
Function description
Forced operation
The water pump runs continuously.
Timed operation
(applies to models
with timer only)
The water pump automatically runs in the set period of time. (The minimum
setting period of time is 1 hour in the timing function)
Screen function
(applies to models
with timer only)
From 9:00 p.m. to 7:00 a.m., the display interface of water pump will enter
the screen rest mode if not operated within 20s (except the running
indicator lamp), and can be lit by pressing any button.
Note: The factory default mode is that the pump is started at fixed time in 24h.
IV. HOW TO USE (applies to models with timer only; models without timer, skip to SECTION V.
FAULT ANALYSIS AND ELIMINATION)
1. Panel description
Forenoon indicator lamp
Afternoon indicator
Running indicator lamp
Clock
Timing period
“+”
“-”
Timing
Time calibration
Run

Z 15+ - Timer Type Circulation Pump
Version 21.07
5
Please read over the operating manual prior to
installation and keep it for reference.
2. Debugging and menu setting:
①Time calibration: Adjust the time of water pump to the current time; press the “Time calibration”
key, the hour area starts flashing, press the “+/-” key to adjust the hours; press the “Run” key to
enter, the minute area will then flash, press the “+/-” key to adjust the minutes; exit the time
calibration function by pressing the “Run” key or not operating for 20s.
②Timing function: Set the running period of water pump; press the “Timing” key, the dial indicator
lamp becomes flashing, and press the “+/-” key to adjust the cursor to the target time period; (the
timer is based on the 12-hour system, and it automatically switches between AM/PM when the
cursor passes through the 12 o’clock) Press the “Run” key to turn on or off the current time period;
exit the timing function by pressing the “Timing” key or not operating for 20s.
③Forced operation: Press the “Run” key, the set time goes off, and the water pump runs
automatically and continuously.

Z 15+ - Timer Type Circulation Pump
Version 21.07
6
Please read over the operating manual prior to
installation and keep it for reference.
V. FAULT ANALYSIS AND ELIMINATION
Fault
Main causes
Elimination methods
The cold-water pipe is
filled with hot water
The temperature sensing function of the jet
valve has failed
Replace the jet valve
The water from the hot
water side of the faucet is
not hot
There are branch pipes
Add the number of jet valves
needed
Forgot to open the cold/hot water angle valve
at the connection of the jet valve
Open the angle valve
The non-return function of the jet valve has
failed
Replace the jet valve
The pump does not run
The current set time is not turned on
Turn on the current set time
The time returns to zero
when the pump is
powered on after it is
powered off
The built-in button battery of pump is
exhausted Calibrate the time manually
Note: All the figures given in this manual are schematic diagrams; as the performance of the product is improving continuously,
the purchased products (including appearance and color, etc.) are subject to physical goods.
END OF SECTION
WILO USA LLC
262-204-6600
www.wilo-usa.com
Wilo Canada Inc.
403-276-9456
www.wilo-canada.com
Wilo Mexico
[phone]
www.wilo-mexico.com