Bosch Thermotechnology Corp.
Important Safety Instructions When using this electrical equipment, basic safety precautions should always be followed, including the following: 1. READ AND FOLLOW ALL INSTRUCTIONS. 2. This appliance must be grounded. 3. Disconnect this product from the electrical supply before cleaning, servicing or removing the cover. 4. To reduce the risk of injury, close supervision is necessary when the product is used near children or elderly persons. 5.
Specifications Voltage supply Amperage Maximum output Temperature control range Pressure range Minimum flow rate Maximum flow rate Dimensions (excl. water couplers) Weight (without water) RP17PT Unit RP27PT Unit 2 x 240V AC (Canada 240VAC) 2 x 40 A (Canada 80 A) 17.25 kW 95°F to 131°F 15 psi to 150 psi 0.6 US gal / min See Graph 1, Page 8 15½” H x 151/4 ” W x 4½” D 20 lbs 3 x 240V AC (Canada 240VAC) 3 x 40 A (Canada 120 A) 26.85kW 95°F to 131°F 15 psi to 150 psi 0.
Mounting the Powerstream Pro WARNING: The heater must only be installed in the orientation shown in Diagram 1 i.e., mounted in a vertical position with the water fittings located at the bottom of the heater. Under no circumstances should the heater be mounted differently. • Undo the retaining screws on the front cover and take the cover off the heater.
• Do not use plastic piping within 3 feet on either side of heater. • Use Teflon tape for sealing pipe threads. Do NOT use pipe dope. • Rem ember to keep the hot water pipe runs as short as possible. • After the heater has been plumbed, and before you wire it, flush it with water to remove any debris or loose particles. Heater must be full of water and air purged before power is turned on. Failure to do so may make the heater inoperable.
Diagram 2 RP17PT Terminal Block Connection The RP17PT requires two independent 240V AC circuits protected by two separate and independent double pole breakers (as shown) rated at 40 A each. Diagram 3 RP27PT Terminal Block Connection The RP27PT requires three independent 240V AC circuits protected by three separate and independent double pole breakers (as shown) rated at 40 A each.
Canada wiring – auxiliary terminal block and connections Fitting the auxiliary terminal block (see diagram below). RP17PT RP27PT NOT FOR U.S.A. • Connect the red wires from the left hand terminal of the new block to the L1 terminals in the unit. (There are two red wires required in the RP17PT and three in the RP27PT). • Connect the blue wires from the right hand terminal of the new block to the L2 terminals in the unit. (There are two blue wires required in the RP17PT and three in the RP27PT).
Starting up the Powerstream Pro Checking for leaks and purging air • Verify all circuit breakers supplying power to the water heater are turned off. • Open all hot water taps supplied by the water heater and inspect all water connections for leaks. • With all hot water taps still open, inspect each tap to ensure all air in the lines has been purged out. • With the air purged and taps still flowing, turn on all circuit breakers supplying the water heater.
For example: • For the RP17PT unit, using the outlet ball valve, ensure the flow rate does not exceed 2.3 gallons / minute. • For the RP27PT unit, using the outlet ball valve, ensure the flow rate does not exceed 3.5 gallons / minute. Note: These figures are based on an inlet water temperature of 55°F and a supply voltage of 240 volts.
Diagram 4: Internal wiring schematic for single phase RP27PT unit. (RP17PT does not have Elt 5 & 6 fitted and uses two supplies). (In Canada an auxiliary terminal block is fitted during installation). Using the Powerstream Pro WARNING Do not use the unit if you think it may be frozen, as this could result in serious damage to the unit. Wait until you are sure that it has completely thawed out before you switch it on. • • • • • 10 Check that the power is switched on at the circuit breaker panel.
Spare Parts Part Number 93 793770 93 793771 93 793813 93 793773 93 793842 93 793774 93 793775 93 793776 93 793843 93 793844 93 793779 93 793845 93 793846 93 793784 93 793847 93 793848 93 793849 93 793850 Description (Refer to Diagram 1, Page 4) 4 way term. block (for RP17PT) 6 way term.
Troubleshooting WARNING Always switch off the electricity supply to the unit before you remove the cover. IMPORTANT: If you are unable to perform the tasks listed below, or need additional assistance please contact your original installer/licensed electrician. Cold water only – Neon light off Flow rate is too low Verify the flow rate out of fixture is at or above the minimum activation rate required for the unit to activate. (Activation rates: AE115 = 0.6 GPM, AE125 = 0.8 GPM).
Water too cold – Neon light on Temperature dial is turned too low Turn the temperature dial located on the bottom of the water heater clockwise for hotter temperatures. Refer to Graph 1 for outlet temperature vs. flow rate vari ance. Water flow is too high Adjust water flow to stay within the water heater’s specifications. See Graph 1 on Page 8 of this manual.
Using an ohmmeter to check for Premature element failure LEFT MODULE Top View Meter probes Outer to Outer Middle to Middle Inner to Inner RIGHT MODULE Top View Ohm Reading 10.5 ± 0.5 Ohms 11.5 ± 0.5 Ohms 15.0 ± 1 Ohms Meter probes Outer to Outer Middle to Middle Inner to Inner Ohm Reading 10.5 ± 0.5 Ohms 11.5 ± 0.5 Ohms 21.0 ± 1 Ohms Note: On RP17PT model, there is no middle element.
Water Temperature Too Hot Temperature dial set too high Turn the temperature knob located on the bottom of the water heater counterclockwise for cooler temperatures. There are restrictions in the plumbing Obstructions in the water path can restrict the flow of water through the heater causing overheating. Verify the heater’s inlet filter screen, faucet aerators, showerheads and whole house filters are clear of debris.
(…Continued) comparable model. However, if the water heater is installed in other than a single family dwelling this heating modules warranty is limited to two (2) years from the date of original installation and operation. Note : Damage caused by exposure to freezing conditions is not covered by the warranty. Note : Damage caused by scale formation is not covered by the warranty. 2. 3.
