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| CE CES CERO SERIES
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INSTALLATION
MOUNTING THE WATER HEATER
INSTALLATION
5. Mounting the water heater
!
CAUTION
: Injury
Hot water outlet pipes leaving unit can be hot to the
touch. Insulation must be used for hot water pipes below
36˝ (0.9 m) due to burn risk to children.
!
NOTICE:
This unit should not be installed in a location
where it may be exposed to temperatures less than
36 °F (2 °C). If the unit may be subject to freezing tempera-
tures all water must be drained from the unit.
Failure to comply with this instruction voids all warranties.
The unit should be located in an area where water
leakage from the unit or connections will not result in
damage to the area adjacent to the unit. If such a location
cannot be avoided it is recommended that a drain
pan be installed under the unit.
Application
Before mounting, double check that the correct voltage the unit
requires matches the voltage of the local power supply. The voltage
and configuration (Wye or Delta) are declared on the nameplate.
Make sure that the supply wire size corresponds to the heater ca-
pacity and wire run according to NEC. Installation carried out by a
licensed electrician will ensure this. The hot water supply includes an
air vent. The incoming water supply is equipped with a pre-installed
pressure relief valve. For water supply line positions, see section
10.4, “Dimension drawings”, pg. 11.
5.1 Mounting
f
Install the water heater as close as possible to the main hot
water draw off points.
f
Keep a minimum of 5˝ (127 mm) clearance on all sides for
service.
f
NEMA 3 enclosures require a minimum clearance of 20˝ (510
mm) on the front side to allow the hinged cover to be fully
opened.
f
If there is a drain tube connected to the pressure relief valve,
make sure that the drain water is not blocked by anything.
5.1.1 Enclosure dimensions, excluding plumbing fittings
NEMA 3
NEMA 4 / 4X
Capacity
No. of
Elements
Width
(X)
Height
(Y)
Depth
(Z)
Width
(X)
Height
(Y)
Depth
(Z)
12–18
kW
3
16
1
/
16
˝
15
1
/
8
˝
9
1
/
8
˝
24˝
24˝
9 ½˝
24–36
kW
6
18
5
/
8
˝
21
7
/
8
˝
9 ¼˝
24˝
24˝
9 ½˝
48–72
kW
12
18
5
/
8
˝
30 ½˝
9 ¼˝
24˝
48˝
13
5
/
8
˝
81–108
kW
18
24˝
48˝
13
5
/
8
˝
24˝
48˝
13
5
/
8
˝
120–144
kW
24
24˝
48˝
13
5
/
8
˝
24˝
48˝
13
5
/
8
˝
5.1.2 Mounting screw positions
Enclosure
3-element
12–18 kW
6-element
24–36 kW
12-element
48–72 kW
NEMA 3 - (A) X/Y
8
1
/
8
˝ / 17
1
/
8
˝
9
5
/
16
˝ / 23
7
/
8
˝
9
5
/
16
˝ / 32
3
/
8
˝
NEMA 4 - (B) X/Y
22
7
/
16
˝ / 25 ¼˝
22
7
/
16
˝ / 25 ¼˝
22
7
/
16
˝ / 49 ¼˝
NEMA 4X - (B) X/Y 22
7
/
16
˝ / 25 ¼˝
22
7
/
16
˝ / 25 ¼˝
22
7
/
16
˝ / 49 ¼˝
Enclosure
18-element
81–108 kW
24-element
120–144 kW
NEMA 3 - (B) X/Y
22
7
/
16
˝ / 49 ¼˝
22
7
/
16
˝ / 49 ¼˝
NEMA 4 - (B) X/Y
22
7
/
16
˝ / 49 ¼˝
22
7
/
16
˝ / 49 ¼˝
NEMA 4X - (B) X/Y 22
7
/
16
˝ / 49 ¼˝
22
7
/
16
˝ / 49 ¼˝
6. Water
connections
!
NOTICE:
Excessive heat from soldering on copper pipes near the
heater may cause damage.
!
NOTICE:
Hard water or water with a high mineral count may dam-
age the unit. Damage to the unit caused by scale or a high
mineral count is not covered under the warranty.
6.1
Venting the air
f
Before the heater is connected to the water supply, make sure
that the water supply is flushed first to ensure it is free from
any scale and dirt. The water pressure needs to be less than
145 psi (10 bar).
f
If the water pressure exceeds 145 psi (10 bar), install a pressure
reducing valve in the cold water pipework. Cold water supply
(inlet) is located on the bottom right.
f
Before the heater is connected to the electric supply, make sure
that the water supply line is flushed for 3 minutes minimum to
vent any air pockets out of the tubing system.
f
Open the service screw on the vent valve to release the air.
f
Open and close the ball valve on the cold water supply side
several times to release any air pockets from the heater.
f
Once the air is released, close the screw on the vent valve.
A
B
