Components
3
1
2
3
4
5
6
7
The ELWA Hotrun electric instantaneous water-heaters are especially designed for point of use
(most efficient and lowest water and energy consumption) or multipoint applications, such as a
wash basin or shower (or both), in fact all places where instant hot water is required. The heating
of the water is started instantly by opening a tap or valve connected to the hot water outlet.
The hot-water drain temperature depends on the following factors:
- How far the actual valve is opened, or the incoming flow into the unit restricted by
a regulating valve or fixed flow restrictor on the inlet side
- The temperature of incoming cold water
- The mixing of hot- and cold water
The hot water temperature rises by reducing the flow rate. By closing the hot-water tap or when
the flow drops below a minimum flow rate the heating will be stopped automatically.
The performance of the Hotrun depends on its kWatt rating.
At an inlet temperature of 12 °C (winter) the following capacity can be expected:
kW loading:
Hot water flow rate:
kW loading:
Hot water flow rate:
3.5
1.9 l/min
7.2
4.0 l/min
4.6
2.6 l/min
9.0
5.1 l/min
6.0 3.6
l/min
When the inlet temp. is 25 °C the performance can be 50% more.
The service temperature will be reached normally within 10 seconds after the Hotrun has been
switched on. The minimum pressure of 100kPa is required for a standard Hotrun.
In this manual we explain to you how you can install your Hotrun easy and safely.
Keep this manual for future use.
The next user of the Hotrun heater might need it.
1. Maximum temperature cut-out
2. Second max.temperature cut-out
(Hotrun 4,5 kWatt and up)
3. Differential pressure switch
4. Micro-switches of dP switch
5. Terminal block
6. Blue marking = cold water inlet
7. Red marking = hot water outlet
General information
Initiation
Maintenance
Troubleshooting
10
Due to its advanced design the Hotrun does not need any maintenance.
A moist rag will do for cleaning the cover.
Scouring and dissolving agents are not suitable.
You can avoid malfunctions by removing scale from the swivel.
When malfunctions occur a qualified electrician should be consulted or the Hotrun should be
returned to Elwa.
Check:
1. The adequate supply and pressure of the water (min. 100kPa).
2. Make sure the cold water inlet and the hot water outlet are not being reversed.
3. The main switch or circuit breaker is switched on.
4. The fuse/circuit breaker is not blown.
Problem
- The Hotrun does not switch on when opening the tap fully.
Cause
- These kind of problems are almost always due to water supply problems. Check if the
pressure on the cold water supply is too low, less than 100kPa, while the Hotrun is in use.
- Too much back pressure in outlets or shower heads after the Hotrun.
- Wrong flow restrictor installed.
- Maximum temperature cut out switches activated, due to air in the Hotrun not released
before switching on the electrical supply.
Remedy
- Fix the water pressure problems, remove any flow restrictors in outlets.
Attention: Avoid overheating
Fill the unit completely with water before plugging it in or turning on the mains power supply.
For that purpose:
- Open the tap and wait until the water flows out from the spout without any air bubbles.
- Close the tap.
- Put the power-plug into the socket or switch-on the mains supply.
- Hotrun is ready to use
