Installation Guide

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English
DHE Pro
DHE Pro 12 DHE Pro 15 DHE Pro 20 DHE Pro 24
3
DHE Pro 29
3
DHE Pro 36
4
612546 612547 612548 612549 612550 612551
Electrical details
Phase single single
5
single
5
single
5
single
5
single
5
Frequency Hz 50/60 50/60 50/60 50/60 50/60 50/60
Voltage V 208 240 208 240 208 240 208 240 208 240 208 240
Wattage kW 9 12 10.8 14.4 14.4 19.2 18 24 21.6 28.8 27 36
Amperage draw A 44 50 2 x 26 2 x 30 2 x 35 2 x 40 2 x 44 2 x 50 3 x 35 3 x 40 3 x 44 3 x 50
Required number & size of circuit
breakers
(double pole)
1
A 1 x 60 2 x 40 2 x 50 2 x 60 3 x 50 3 x 60
Required wire size and number of runs
2
AWG Copper 1 x 6/2 2 x 8/2 2 x 8/2 2 x 6/2 3 x 8/2 3 x 6/2
Connections
Water connection 3/4˝ NPT 3/4˝ NPT 3/4˝ NPT 3/4˝ NPT 3/4˝ NPT 3/4˝ NPT
Hydraulic data
Volume of water in unit l 0.5 1.0 1.0 1.0 1.5 1.5
Volume of water in unit gal 0.13 0.26 0.26 0.26 0.39 0.39
Minimum water flow to activate unit l/min 1.4 1.9 1.9 1.9 2.9 2.9
Minimum water flow to activate unit GPM 0.37 0.50 0.50 0.50 0.77 0.77
Maximum permissible inlet temperature °C 55 55 55 55 55 55
Maximum permissible inlet temperature °F 131 131 131 131 131 131
Application limits
Maximum permissible pressure MPa 1.0 1.0 1.0 1.0 1.0 1.0
Maximum permissible pressure PSI 150 150 150 150 150 150
Test pressure MPa 2.0 2.0 2.0 2.0 2.0 2.0
Test pressure PSI 300 300 300 300 300 300
Features
Temperature display digital digital digital digital digital digital
Cover and back panel Sheet steel Sheet steel Sheet steel Sheet steel Sheet steel Sheet steel
Color gray gray gray gray gray gray
Dimensions
Height mm 369 369 369 369 369 369
Height in 14.52 14.52 14.52 14.52 14.52 14.52
Width mm 420 420 420 420 420 420
Width in 16.54 16.54 16.54 16.54 16.54 16.54
Depth mm 117 117 117 117 117 117
Depth in 4.61 4.61 4.61 4.61 4.61 4.61
Weights
Weight kg 6.1 7. 3 7. 3 7. 3 8.6 8.6
Weight lb 13.5 16.1 16.1 16.1 19 19
11. Troubleshooting
Symptom Possible cause Solution
No hot water – circuit breakers off
– safety thermal cut-out tripped
– not enough flow rate to activate unit
– turn circuit breakers on
– reset safety thermal cut-out
– clean filter screen at unit
– clean faucet aerator or shower head
Not enough hot water – filter screen clogged – clean filter screen at unit
Water not hot enough – water flow rate too high
– voltage too low
– reduce water flow rate until power light on front
cover stops blinking
– supply correct voltage to unit
If you are not able to resolve a problem please contact us toll free
at 800-582-2213 before removing the unit from the wall. Aqua
Power is happy to provide technical assistance. In most instanc-
es, we can resolve the problem over the phone.
1
This is our recommendation as the manufacturer. Check local codes for compliance if necessary. Tankless water heaters are considered a non-continuous load.
2
Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load.
3
Requires a minimum of 200 A main service.
4
Requires a minimum of 300 A main service
5
29/Pro 29 & 36/Pro 36 may be wired for balanced 3-phase 208V. 15/Pro 15, 20/Pro 20, 24/Pro 24 may be wired for unbalanced 3-phase 208V.
*
DHE Pro models have Advanced Flow Control that automatically reduces the output flow rate to maintain the set temperature when demand temporarily
exceeds capacity