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grohtherm micro 34487000
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Grohe grohtherm micro 34487000 [5/30] Adjustment

Application

Thermostat mixers are designed for hot water supply via pressurised

storage heater and utilised in this way provide the best temperature

accuracy. With sufficient power (from 18 kW or 250 kcal/min) electric or

gas instantaneous heaters are also suitable.

Safe limitation of the max. outlet temperature via preset thermostats on

every standard wash basin mixer (thermal scalding protection).

Thermostat mixers cannot be used in conjunction with low-pressure

storage heaters (displacement water heaters).

All thermostats are adjusted in the plant at a flow pressure on both sides

of 3 bar.

If temperature deviations should occur on account of special installation

conditions, the thermostat must be adapted to local conditions (see

Adjustment).

Specifications

Minimum flow pressure with downstream resistances 1 bar

Max. operating pressure 10 bar

Recommended flow pressure 1 - 5 bar

Test pressure 16 bar

Flow rate at 3 bar flow pressure approx. 20 l/min

Max. water temperature at hot water inlet 80

°C

Pre-adjustment 40 °C

Hot water temperature at supply connection at least 2 °C higher

than mixed water temperature

Minimum flow rate = 5 l/min

A pressure reducing valve must be fitted in the supply line if static

pressures exceed 5 bar to satisfy noise level ratings.

Installation

Installation, see fold-out page II.

1. Place seal (C) and strainer (D) on hot water service valve (B) and

screw under-basin thermostat (A) to the hot water service valve (B),

see Fig. [1].

Refer to the dimensional drawing.

Mixer fittings

1. Place seal (C) and strainer (D) on cold water service valve (E). Screw

on union set (F) [ref. No. 47 533, see also fold-out page I], see Fig. [2].

2. Connect hose end to the front connector (G) on the under-basin

thermostat, see Figs. [2] and [3].

3. Screw cold water supply (H) for mixer to the union set (F), see Figs. [3]

and [4].

4. Connect hot water supply (J) for mixer to the rear connector (K) on the

under-basin thermostat, see Figs. [3] and [4].

Pillar taps

1. Place seal (C) and strainer (D) on cold water service valve (E).

Connect hose (P) [ref. No. 45 704, see also fold-out page I] directly to

cold water service valve (E), see Fig. [6].

2. Connect water supply (J) for mixer to the rear connector (K) on the

under-basin thermostat, see Figs. [3] and [7].

It is recommended that a flexible pressure hose is connected as

installation aid for fittings with copper pipes [ref. No. 45 120, see fold-out

page I].

Adjustment

Temperature adjustment, see Figs. [5], [8] and [9].

• Before the mixer is put into service, if the mixed water temperature

measured at the point of discharge varies from the specified

temperature set on the thermostat.

• After any maintenance operation on the thermoelement.

Open the single-hole mixer by turning on the hot water and check the

temperature of the water with a thermometer, see Fig. [5].

Check the temperature of the water at the pillar tap with a thermometer,

see Fig. [8].

If the desired temperature has not been reached, proceed as follows,

see Fig. [9]:

1. Pull or lever off cap (L) using a screwdriver, see fold-out page I.

2. Remove stop ring (M) and graduated collar (N).

3. The temperature can be adjusted, using a 3mm hexagon socket

spanner in the hexagon aperture on the thermoelement (O).

4. After reaching a temperature of 40 °C, attach graduated collar (N), so

that the 40 °C mark aligns with the red pin (S) of the thermoelement (O).

5. Attach stop ring (M), so that the red pin (S) is located in the aperture (R).

Temperature adjustment

For mixer fittings , the max. hot water temperature is adjusted at the

thermoelement (O) by pre-setting the thermostat, see Fig. [9].

The mixed water temperature is pre-adjusted at the thermoelement (O)

for thermostats in conjunction with pillar taps, see Fig. [9].

The cover cap (L) and the stop ring (M) must be removed to adjust the

temperature. The temperature can now be adjusted using the 3mm

hexagon socket spanner. Turn clockwise (to decrease temperature), turn

anti-clockwise (to increase temperature), see also indicator on the

graduated collar (N). Reinstall stop ring (M) and cover cap (L).

Prevention of frost damage

When the domestic water system is drained, thermostat mixers must be

drained separately, since non-return valves are installed in the hot and

cold water connections. For this purpose, the thermostat must be

removed from the unions.

Maintenance

For maintenance, see fold-out pages I and II.

Shut off the hot and cold water supply.

I. Non-return valves

1. Unscrew and remove under-basin thermostat (A) from hot water

service valve (B), see Fig. [1].

- Remove strainer (D) and seal (C).

- Unscrew and remove nipple (V) using an 8mm hexagon socket

spanner (left thread).

- Remove nut (W).

- Remove non-return valve (X).

2. Unscrew union set hose (F) from front outlet connector (G) on the

under-basin thermostat, see Fig. [2].

- Remove non-return valve (T), see fold-out page I.

II. Thermoelement

1. Remove cover cap (L).

2. Remove stop ring (M) and graduated collar (N).

3. With a 22mm open-ended spanner, unscrew and remove

thermoelement (Z).

Readjustment is necessary after each maintenance operation on the

thermoelement (see Adjustment).

Inspect and clean all parts, replace if necessary and grease with special

grease.

Assemble in reverse order.

In order to ensure long-term protection from scalding, it is

necessary to perform a safety check on the fitting at least

once a year:

1. i.e. to check that the pre-adjusted outlet temperature is not

exceeded.

If the temperature has been exceeded, it must be readjusted.

2. Check if the safety shutoff is working:

- Open mixer fitting for hot water, or open pillar tap.

- Close cold water service valve (E), see Figs. [2] or [6].

- The amount of water now escaping must be no more than a thin trickle

of water. If this is not the case, the thermoelement (47 574) must be

replaced.

Replacement parts, see fold-out page I ( * = special accessories).

Care

For directions on the care of this thermostat mixer, please refer to the

accompanying Care Instructions.

Grohe grohtherm micro 34487000 [5/30] Adjustment

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