11
Installation
CNA-Series Tankless Heater
Keltech •
215-1814 Rev. C; ECN 150010
7/13/2015
Perform Operational Test No. 1
Perform Operational Test No. 2
7
8
A
Start the water flow through the heater by
starting the process or fixture this heater is
connected to in order to activate heater .
A
Turn on hot water faucet/fixture/process
(min flow rate of 1 .5gpm) . The heater should
activate immediately .
C
Press the up or down arrow keys to
adjust the set temperature . The controller
displays the temperature of water
measured at the outlet .
B
Turn off hot water faucet/fixture/process .
The flow sensor will deactivate and shut
off power to the heater .
D
Test water temperature and stability at
outlet by viewing the display . Controller
displays (in red) the temperature of water
exiting the heater .
B
When flow rate reaches approximately
1 .5gpm, the flow sensor recognizes this
condition and begins the heating process .
When the flow sensor activates:
• Green bank energized lights illuminate on the
front bezel verifying power supply connection to
the heating elements via the solid-state relays .
• Element load lights may be solid or flash
in unison as heating elements modulate
depending on the hot water demand .
• Digital temperature controller shows water
temperature . Additional programming is
not necessary .
Located on the panel are one (36-63kW)
or two (72kW-144kW) green ready lights.
When illuminated, the safety circuit is
engaged and ready for use.
Heater will not energize heating elements if the
inlet water temperature is equal to or greater than
the temperature set on the digital controller .
If the water flow exceeds maximum heating capacity of the heater, the temperature of water at the outlet
may be lower than the temperature selected on the controller. See table below to determine maximum
temperature rise capabilities.
Each model has precise specifications for temperature rise capabilities.
Temperature Rise (GPM & F°)
Models 480/600V
kW
2 gpm
Δ
T °F
4 gpm
Δ
T °F
6 gpm
Δ
T °F
8 gpm
Δ
T °F
10 gpm
Δ
T °F
12 gpm
Δ
T °F
15 gpm
Δ
T °F
20 gpm
Δ
T °F
25 gpm
Δ
T °F
30 gpm
Δ
T °F
35 gpm
Δ
T °F
CNA-36
36
122
62
40
30
24
20
16
12
CNA-54
54
93
60
45
37
31
24
18
14
CNA-63
63
107
71
53
43
35
29
21
17
14
CNA-72
72
124
80
80
49
40
33
24
20
16
14
CNA-108
108
120
90
74
61
49
36
29
24
21
CNA-126
126
143
107
86
71
57
43
34
28
25
CNA-144
144
120
96
82
66
49
39
33
28
Temperature Rise (lpm & C°)
Models 480/600V
kW
7 .6 lpm
Δ
T °C
15 .1 lpm
Δ
T °C
22 .7 lpm
Δ
T °C
30 .2 lpm
Δ
T °C
37 .8 lpm
Δ
T °C
45 .4 lpm
Δ
T °C
56 .7 lpm
Δ
T °C
75 .6 lpm
Δ
T °C
94 .5 lpm
Δ
T °C
113 .4 lpm
Δ
T °C
132 .5 lpm
Δ
T °C
CNA-36
36
68
34
22
17
13
11
9
7
CNA-54
54
52
33
25
21
17
13
10
8
CNA-63
63
59
39
29
24
19
16
12
9
8
CNA-72
72
69
44
44
27
22
18
13
11
9
8
CNA-108
108
67
50
41
34
27
20
16
13
12
CNA-126
126
79
59
48
39
32
24
19
16
14
CNA-144
144
67
53
46
37
27
22
18
16
CNA-Series