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

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

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

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

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

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

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

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

+52 442 167 00 32

www.wilo-mexico.com

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