Legalett 4000W User Manual

HEATING UNIT - 4000W

January, 2006

Revised:May, 2008

Form № 0524

Page 1 of 2

The 4000W heating unit is installed in the foundation

slab or intermediate oor, and contains a fan and four
water/air-exchangers, with valves that are controlled by 1

TECHNICAL DATA

Operating voltage ........................1 P - 230V/24V 60Hz

Fan motor power consumption ............................225W

Breaker rating (GFI required) .................................15A

Water-air exchanger output

with 8 - 100 mm duct ........approx. 5 kW @ 55°C/130°F

air ow .............. approx. 900 m3/h / 530 CFM

with 20 - 50 mm duct ........approx. 4 kW @ 55°C/130°F

air ow .............. approx. 750 m3/h / 440 CFM

Air temperature range.................... 30-55°C /85-130°F

Connection, pipe......lavatory style, 1/2" straight thread

FUNCTION

The 4000W is controlled by one (single zone) to four
(quad zone) external electric room thermostats. These
external thermostats operate the control valves in the unit,
opening the control valve when the room needs heat.
A water temperature sensor built into the 4000W starts
the fan motor when the inlet water temperature reaches
30°C (85°F) When the control valve is closed and the
inlet water temperature decreases to approximately 27°C
(80°F), the fan motor stops. The fan operation is inde­pendent of the position of the zone valve, and responds
only to water temperature.

When controlled by a programmable thermostat, the
4000W can use two-tiered energy rates for night storage of
less expensive energy in the LEGALETT heated oor.

- 4 external electric room thermostats. It is used together
with heating unit box 4000A 100/100 (100 mm (4") spiral
pipes) or with heating unit box 4000A 50/50 (50 mm (2")
plastic pipes).

Design data for all 4 exchangers and valves:

Design ow ................................ 400 l/h / 1.75 USGPM

Design pressure drop ................. 21.5 kPa/7.2’/3.1 PSI

Maximum full ow pressure drop (noise limited):

......................................................35 kPa/11.2’/5.1 PSI

Maximum zero ow pressure drop (i.e. maximum pump

pressure, noise limited) ..................... 40 kPa/15’/7 PSI

This data is generic. Each Legalett installation is unique.
Refer to customized specications on your installation
design drawing for actual design parameters.

1 P - 230V 60Hz

15A circuit breaker

thermostats 1-4

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1

3

24

ASSEMBLY

Install the heating unit boxes in the correct location,
with the height adjusted so that the lid is ush with
the concrete surface, before pouring the concrete.
Refer to the instructions on the box cover.

1. Run conduit from one of the cable inlets on the
box to the local disconnect for 230V power.
Run conduits from the remaining cable inlets
to a convenient location above the slab for
each of the 24V thermostats, external 24V
transformer (not supplied) and optional signal
wiring to the boiler.

2. Connect the sleeves for the inlet and outlet
water pipes to the water pipe connections of
the furnace box. Install the water pipes, and
make sure they extend at least 100 mm (4")
into the box.

3. After the concrete has dried sufciently with
the construction heater, prepare the box for the
heating unit according to the steps below, which
are performed by an authorized electrician and
plumber.

4. Clean the furnace box carefully. No water or
dampness should be in the box or pipe system
when installing the permanent insert.

heating unit box

4000A 50/50

electrical
connections

oor hatch

sound insulation

mat, 30 mm

heating unit

cover

heating insert

heating unit box

electrical connections

hole for water pipe inlet
hole for water pipe return

4000W

Heating unit box

4000A 100/100 is

similar

water pipe

connections

HOT WATER CONNECTIONS

1. Install threaded adaptors with integral gasket
for ½” NPSM (lavatory-style straight threaded)
on water pipe, and adjust pipe to length so that
the end of the ttings stick 52 mm (2") inside
the box as shown in picture 1.

2. Loosen the two vertical pipes with their elbow
connections, which are loosely mounted on the

heating unit for mounting of inlet and return water

pipes. Then mount the lower elbow connections
to the water pipes, as shown in picture 2.

3. Mount the heating insert, so that the vertical pipes
stick into the elbow connection above and tighten
the joints. See pictures 3 and 4.

4. Turn on water and check for leaks.

5. Once the electrical connections have been
completed, bleed any air from the system after
a test run.

#1.

52 mm

#2.

#3.

#4

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