1
3
2
4
1.
4.
HOT WATER CONNECTIONS
sound insulation
mat, 30 mm (1")
fl oor hatch
heating unit
cover
electrical connections
heating insert
heating unit box
hole for water pipe return
hole for water pipe inlet
If 1 - 3 thermostats are used, or if more than one thermostat
is installed in the same room, install a jumper between the
connection blocks 3, 6, 9 and 12 as required.
Refer to the fl oor plan for thermostat locations.
ELECTRICAL CONNECTIONS
Install the heating unit boxes in the correct location, with the height
adjusted so that the lid is fl 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 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 suffi ciently with the construction
heater, prepare the box for the heating unit according to the steps
below, which are to be 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.
ASSEMBLY
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 for
servicing. GFI protection is required.
3. Use properly sized copper wire for
connection to the panel.
4. Connect thermostats and verify that each
zone responds to the correct thermostat.
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 fl oor hatch.
8. Install the fl oor hatch. If desired, use
standard transition trim between the hatch
and the fl oor.
1. Flush debris and bleed air from both lines before connecting
insert.
2. Install 'swivel faucet adaptors' (female threaded adaptors with
integral gasket for ½” lavatory-style straight threaded NPSM male
fi ttings) on PEX water pipe, and adjust pipe position so that the
end of the fi ttings stick 38 mm (1.5") inside the box (Picture 1). If
PEX pipe is not used, or a 'swivel faucet adaptor' is not available
for the PEX pipe used, please contact Legalett for assistance.
3. Disconnect the two vertical pipes from their top elbow connections,
which are loosely mounted on the heating unit inlet and outlet pipes.
Connect lower
elbow connections to the water pipes (Picture 2).
4. Install the heating insert so that the vertical pipes stick into the top
elbow connections above and tighten the joints (Pictures 3 and 4).
5. Turn on water and check for leaks.
6. Once the electrical connections have been completed, turn up all
thermostats to open all the valves and then bleed any air from the
heating insert using the bleed screws on the exchangers.
water pipe
connections
electrical
connections
4000W-24
heating unit box
4000A 50/50 (2")
Heating unit box
4000A 100/100 (4")
is similar
www.LEGALETT.com
2.
3.
24
L1
L2
1
2
3
4
5
6
7
8
9
10
11
12
B
la
ck
Br
o
w
n
B
lu
e
Valve 1
Fan
1
M
400mA
Valve 2
Valve 3
Valve 4
230V
60Hz
15A
C
R
C
W
Thermostat 1
R C
W
R
C
W
Thermostat 2
R C
W
R
C
W
Thermostat 3
R C W
R
C
W
Thermostat 4
R C
W
24V
230V
30º C (86º F)
38 mm (1.5") to fi tting gasket
