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Grundfos Timer/Thermostat Instructions

Timer and Thermostat Controls

Model # Description Price & Quantity
50.54-74 Timer control - fits any 1 speed UP model (115v)
For pumps with date code 0527 or before. Old style terminal box
$92.57
59.93-88 Timer control - New Style - fits any 1 speed UP model (115v)
For pumps with date code 0528 or after. New style terminal box.
$92.38
59.54-43 1/2" Copper clip-on Thermostatic control (not adjustable) - 85°F - 105°F $37.75
59.54-44 3/4" Copper clip-on Thermostatic control (not adjustable) - 85°F - 105°F $37.81
Clip-on thermostatic controls automatically turn the circulator "OFF" when the temperature in the hot water line exceeds 105°F and "ON" when the temperature falls below 85°F. (temperatures are approximate)
clip on thermostats can not be used with Line Cord models
Thermostats are somewhat (but not perfectly) temperature accurate

View complete installation instructions below

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View a picture of the Grundfos timer installed.

View a picture of the Grundfos timer and thermostat installed.

This timer is very easy to install.
It is the finest quality timer we have ever seen.
The following is not for most people that purchase this timer, as most people simply install it, and forget about it.
The rest of this page is for those people that want ALL the details and ALL the technical stuff.

1. APPLICATION

Grundfos timer and thermostatic control accessories are designed only for use with specified Grundfos Series UP circulators installed in indoor hot water service systems. Applicable Series UP models include all single speed, 1-phase, 115 volt, and 60-hertz pumps with date codes of 9132 or higher. (NOTE: These accessories are not intended for use with the Model UPS15-42F, 3-speed circulator.)

The timer control is designed to turn the circulator on and off at preset times, allowing the user to select operation of the circulator during high-use periods of the day.

The thermostatic control automatically turns the circulator off when the temperature in the hot water line exceeds approximately 105°F (as in the case of periods of no demand) and back on when the temperature falls below approximately 85°F (as in the case of periods with high demand). Temperature accuracy of these thermostats is not "perfect" within 1/2 degree. If you must have a "perfect" accuracy thermostat, then these are not for you. These thermostats are great for the right application, which is to turn off when the "approximate" temperatures have been reached, and turn on when the "approximate" temperature has declined down to approximately 85°F.

When the timer and thermostatic controls are installed together, in series, the circulator operates ONLY at the preset clock times specified by the user AND ONLY when the temperature conditions of the thermostat are met. That is, if either the timer control or the thermostatic control switch is open (off), the circulator will not operate.

2. TECHNICAL DATA

TIMER CONTROL
Supply Voltage: 115-120 VAC, 60 hertz
Contact Rating: 16 amps
Ambient Temperature: -4°F to 175°F
Shortest Switching Interval: 15 minute increment
Switch Modes: "Timer", "ON" Override, "OFF" Override
Protection: Clear plastic cover for dust and moisture protection of the clock face

THERMOSTATIC CONTROL
Supply Voltage: 115-120 VAC, 60 hertz
Contact Rating (resistive): 5.8 amps
Type: Surface sensing, snap acting bimetallic disc
Enclosure: Environmentally sealed

Switch Modes: Switch open (OFF) at water temperature of approximately 105°F and above and switch closed (ON) at approximately 85°F and below.

Contact Position: Normally closed
Mounting: (1/2") Clip-on type for 5/8" O.D. system piping size (i.e. 1/2" I.D. copper tubing or 3/8" steel pipe)
(3/4") Clip-on type for 7/8" O.D. system piping size (i.e. 3/4" I.D. copper tubing or 1/2" steel pipe)

May be mounted on either the inlet or outlet piping of the circulator.

3. INSTALLING THE TIMER CONTROL

POSITION OF PUMP MOTOR SHAFT AND TERMINAL BOX
All Series UP circulators MUST be installed with the motor shaft in the horizontal position. The pump terminal box MUST be located on top or to either side of the motor housing.
CAUTION: Do not locate the terminal box below the motor housing.

To change the terminal box position:

  1. Remove the (4) Allen screws while supporting the motor.
  2. Carefully separate the motor from the pump chamber and rotate it to the desired terminal box position.
  3. Replace the Allen screws and tighten diagonally and evenly (7 ft-lb torque).
  4. Check that the motor shaft turns freely. Remove the large screw in the middle of the nameplate, insert a small flat blade screwdriver into the slot at the end of the shaft, and turn gently. (Note: not applicable to UP15-42F models.)
  5. If the shaft does not turn freely, repeat the disassembly/reassembly process.

Note: If the pump is installed in the system, disconnect the power supply and either drain the system of liquid or close the isolation valves on either side of the circulator before removing the motor housing.

INSTALLATION PROCEDURE
The timer control accessory is electrically connected and mounted to the circulator terminal box. Install as follows:

  1. Remove the retaining screw in the existing terminal box cover and remove the cover. The timer control unit replaces this cover.
  2. See "5. ELECTRICAL HOOK-UP", for specific wiring instructions for hookup as an individual component or in series with the thermostatic control.
  3. After wiring is completed and checked, install the timer control unit onto the terminal box bracket and reinsert the terminal box screw. Be careful not to bind or leave exposed any terminal box wires.

4. INSTALLING THE THERMOSTATIC CONTROL

INSTALLATION PROCEDURE

  1. The thermostatic control is a surface temperature-sensing device that must be in contact with the system piping to operate properly. Separate models include clip-on mounts for 3/4" (7/8" O.D.) and 1/2" (5/8" O.D.) copper tubing. These models are also suitable for use with 1/2" and 3/8" schedule 40 steel pipe, respectively.
  2. See "5. ELECTRICAL HOOK-UP", for specific wiring instructions for hookup as an individual component or in series with the timer control.

5. ELECTRICAL HOOK-UP

All electrical work should be performed by a qualified electrician in accordance with the latest edition of the National Electric Code and local codes and regulations.
Verify the electrical supply to be certain the voltage, phase and frequency match that of the circulator and accessory components.


Grundfos Timer and Thermostat
Grundfos Timer and Thermostat
Grundfos Timer and Thermostat

6. SETTING AND OPERATING THE TIMER CONTROL AND STARTING THE PUMP

NOTE: before the circulator is started, the system must be filled with liquid and vented.

  1. Set the timer switch to the actual time by turning the programming ring in the direction of the arrow until the timing arrow points to the actual time on the ring.
  2. Switch on the power supply to the circulator and set the manual switch to the "ON" position. The circulator will now start.
  3. Set the required "ON"/"OFF" times on the programming ring by pushing the programming tabs either away from or toward the center of the ring. Tabs pushed away from the center indicate circulator switched "ON" while tabs pushed toward the center indicate circulator switched "OFF".
  4. Set the manual switch to the "TIMER" position. The circulator will now start/stop according to the settings of the programming tabs.
  5. For continuous operation, set the manual switch to the "ON" position. To switch the circulator off, set the manual switch to the "OFF" position. The "ON"/"OFF" modes may be used without affecting the function of either the programming ring or timer switch.
  6. In case of power outage the timer will not keep time. After power has been restored, the correct time of day must be reset by rotating the programming ring in the direction of the arrow until the timing arrow points to the actual time on the ring.
Frequently Asked Questions

Q. "Why don't you recommend ordering thermostats with the line cord pumps?"
A. Pumps with line cords are pre-wired and they would require re-wiring in order to use the thermostats, so we recommend you purchase the pump, thermostat and timer separately when you want to use a thermostat.

Q. "Does a hot water recirculating system use up a lot of energy?"
A. Both options use energy. But not as much as most people think. On the recirculating system we highly recommend insulating all of your hot water pipes. Also having a timer and/or a thermostat will use even less energy. An electric tankless water heater doesn't use any energy when you're not drawing hot water.

Q. "Is the thermostat adjustable?"
A. The thermostatic control automatically turns the circulator off when the temperature exceeds approximately 105°F and back on when the temperature drops below approximately 85°F. The thermostat is not adjustable.

Q. "Your timer seems expensive. Is it necessary?"
A. Most three-prong wall timers should work, but Grundfos makes a fantastic timer for their most popular model (#UP15-18SU). It can be set in 15-minute increments, mounts right onto the pump, and is the best timer we have ever seen.

Q. "Regarding your cast iron pumps you say that they are only for a closed system. What is a 'closed system'?"
A. A closed system is a recirculation loop for water (or other liquid) where once it is set up and running, no new liquid is introduced into the system. If new liquid is brought into the system it will also bring air (oxygen) with it and over time this will cause the cast iron pump to rust out and fail.

Q. "How is the quality of a Grundfos brand pump?"
A. We are not aware of any finer made pump. Having said that we do want you to realize that every pump has a specific function. For example, a circulating cast iron pump isn't generally used for domestic drinking water. Every pump also has a specific flow rate, etc., so please don't assume that you can simply order the lowest priced Grundfos pump and that it will work for your situation. Grundfos is top quality but recognize that a $20,000 bicycle might not go as fast as a $10,000 car.

Q. "Which pump would you recommend for most residential recirculation systems?"
A. Our most popular unit is the #UP 15-29SU (formerly the #UP15-18SU). It's a very quiet unit and uses less electricity than most light bulbs (65 watts!). For even more savings you can also incorporate a timer and/or thermostat.



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