www.legalett.com
Contactors marked K1 - K4
O.H.= Overheating protection device
ASSEMBLY
ELECTRICAL CONNECTIONS
Install the heating unit boxes in the correct location,
with the height adjusted so that the lid is flush 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
230V thermostats.
2. (Optional) For future conversion to water insert,
run a conduit for an external 24V transformer (not
supplied) and optional signal wiring to the boiler.
As well, 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 sufficiently 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.
1. Check the electrical data on the unit so that other
installation materials are compatible. The installation
must be performed by an authorized electrician.
2. Install a properly sized two-pole local disconnect
to enable total isolation. GFI protection is
recommended.
3. Use properly sized copper wire for connection to the
panel.
4. Connect thermostats.
5. Seal the conduits which run into the unit using a duct
sealing compound for both water and electrical, after
the water and electrical connections have been made
for sound attenuation.
6. Install the heating unit cover. Test run for 1 hour and
then open for a check. If necessary clean, check
for dryness, and test run again. If moisture is still
present, re-install construction heater and run until
the system is dry.
7. Install the sound insulating foam-rubber mat between
the heating unit cover and the floor hatch.
8. Install the floor hatch. If desired, use standard
transition trim between the hatch and the floor.
Overheating Protection
If the overheating protection has tripped, then complete
the following steps:
1. Turn off the power.
2. Carefully investigate the reason for the overheating.
Any repairs should only be performed by an authorized
electrician.
If 1 - 3 thermostats are used, install a jumper between
the connection blocks 3 and 6, 9 and 12 as required.
Refer to the floor plan for thermostat locations.
Thermostats 1 - 4
1 P
- 230V 60Hz
30A
circuit breaker
Sound Insulation
mat, 30 mm (1")
Floor Hatch
Heating unit
cover
Electrical connections
Heating Insert
Heating unit box
Water pipe return hole
(future consideration)
Water pipe inlet hole
(future consideration)
W a t e r p i p e
connections for
future conversion
to water
Electrical
connections
4000E
Heating unit box
4000A 50/50 (2")
Heating unit box
4000A 100/100 (4")
is similar
4. Clean the furnace box carefully. No water or
dampness should be in the box or pipe system when
installing the permanent insert.
5. Install the heating unit insert with the terminal block
turned towards the electric connection conduit
openings.
75
°C
(165°F)
75
°C
(165°F)
75
°C
(165°F)
75
°C
(165°F)
110
°C
(230°F)
110
°C
(230°F)
K1
K2
K3
K4
Blue
Black
Brow
n
C
M
1000 W
Fan
1000 W
1000 W
1000 W
O.H.
L1 L2
1
2
3
4
5
6
7
8
9
10 11 12
O.H.
O.H.
O.H.
O.H.
O.H.
LOAD
LOAD
LOAD
LOAD
L1
L1
L1
L1
L2
L2
L2
L2
L2
LOAD
L1
LOAD
LOAD
LOAD
L1
L1
L1
L1
L2
L2
L2
L2
LOAD
LOAD
LOAD
LOAD
