Wall hung, fanflue, roomsealed, high efficiency gas boiler (80 pages)
Summary of Contents for Biasi Riva Plus
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Riva Riva PLUS PLUS WALL HUNG GAS BOILER FOR CENTRAL HEATING SUPPLY Please Read Instructions Carefully Save for Future Reference WARNING: If the information in this manual is not followed exactly, a fi re or explosion may result causing property dam- age, personal injury or loss of life.
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CSA 4.9 and is CSA compliant. This Riva Plus boiler has a 2 year warranty, a copy of which is provided with the boiler. Please be sure to return the warranty registration card as the warranty will be void without your boiler’s serial numbers (located on the ratings label affi...
Zone Valve Microswitch Connection 12.5 Finishing 12.6 Circulator Sizing Circ. Cap. as a Function of Flow Rate 13.1 Expansion Vessel 13.2 Piping 30-33 Primary-Secondary Piping 14.1 Primary-Secondary with Zone Valves 14.2 Manifold Piping with Zone Valves or Circ. 14.3 RIVA PLUS MANUAL...
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Checking the Combustion Fan 17.7 Checking the Flue 17.8 Visual Inspection of Appliance 17.9 Gas Pressures and Soundness 17.10 Condensate trap 17.11 Venting Spare Parts 44-46 Separate Vent 18.1 Coaxial Vent 18.2 Roof Vent 18.3 Installer Notes RIVA PLUS MANUAL...
Caution: Do not use this boiler if any part has been under water. Immediately call a qualifi ed service technician to inspect the boiler and to replace any part of the control system and any gas control which has been under water. RIVA PLUS MANUAL...
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If any of the symptoms of CO occur, or if any of the signs of carbon monoxide are present, VACATE THE PREMISES IMMEDIATELY AND CONTACT A QUALIFIED HEATING SER- VICE COMPANY OR THE GAS COMPANY OR THE FIRE DEPARTMENT. ONLY QUALIFIED, LICENSED SERVICE CONTRACTORS SHOULD PERFORM WORK ON YOUR BIASI RIVA PLUS BOILER. RIVA PLUS MANUAL...
- B149 Installation Codes E. ANSI/ASME - CSD-1 The above codes are available from: National Fire Protection Association (NFPA) CSA International Battery March Park 8501 E. Pleasant Valley Road Quincy, Massachusetts, 02269 Cleveland, OH 44134-5575 http://www.nfpa.org http://www.csa-international.org RIVA PLUS MANUAL...
1. General Information The Riva Plus is a high effi ciency condensing, wall mounted gas boiler which provides central heat. The boiler features a gas valve which modulates the energy input from 49,476 BTU/h to 116,008 BTU/h. The boiler is shipped fully assembled with the components listed on page 11.
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Twin split pipes 3.25/3.25 Flue pipe enclosed Nominal heat fl ow rate 116.0 Flue pipe free air (0/2000ft) Nominal heat fl ow rate Hot water pipes 1” 110.2 (2000/4500ft) Min Exhaust temperature °F Max Exhaust temperature °F RIVA PLUS MANUAL...
14 Modulation operator 31 Water supply inlet cock 15 Gas valve outlet pres. Test point 32 Condensate trap 16 Gas valve inlet pres. Test point 33 Condensing heat exchanger 17 Central heating expansion vessel 34 Flue termostat 10 RIVA PLUS MANUAL...
3. Internal Piping & Parts List Note: Pressure Relief Valve (#19) should be piped to a drain or to the fl oor as lose as pos- sible to a drain. RIVA PLUS MANUAL...
Flame presence? Closes gas valve Stops fan End of ignition period? Interrupts ignitor Boiler lockout Interrupt igniter Gas valve open Reset push – button pressed Close gas valve Flame presence? Safety thermostat Opens the circuit? Flame presence? RIVA PLUS MANUAL...
CO detector in the boiler room. Figure 5.2 When choosing an installation location insure the exhaust and intake pipes comply with NFPA 54. The drawing on the next page illustrates the restrictions on exhaust locations. 14 RIVA PLUS MANUAL...
TERMINAL CLEAR OF SNOW AND ICE NOTE: USE ONLY LISTED COMPONENTS SUPPLIED WITH THE BOILER. SURFACE DISCOLORATION OF THE BUILDING MAY OCCUR DUE TO IMPROPER INSTALLATION. QHT WILL NOT ACCEPT RESPONSIBILITY OR LIABILITY FOR SUCH DISCOLORATION. 3 ft. minimum 12 in. minimum C - 12 in.
If you are using a separate pipe system drill holes marked B and C (ø 3.25”) shown below as well as on the paper template. 6. Remove paper template and hang boiler on bracket. Figure 7.1 16 RIVA PLUS MANUAL...
B149, Installation Codes. When resizing any portion of the common venting system, the common venting system should be resized to approach the minimum size as de- termined using the appropriate tables in Part 11 of the National Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA B149, Installation Codes. RIVA PLUS MANUAL...
3. A Product-approved vent terminal must be used, and if applicable, a Product-approved air intake must be used. Installation shall be in strict compliance with the manufacturer’s instructions. A copy of the installation instructions shall remain with the appliance or equipment at the completion of the installation. 18 RIVA PLUS MANUAL...
If one or more exstensions have to be used they must be adequately supported so that there is no sag in the fl ue pipe and a minimum fall of .3 inches per foot toward the boiler is ensured. RIVA PLUS MANUAL...
• Connect exhaust (inner) pipe to concentric elbow. • Connect intake (outer) pipe to concentric elbow. • Secure elbow to boiler using gasket and four screws provided. • Secure end cap on the intake pipe outside the house. 20 RIVA PLUS MANUAL...
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• Attach each collar to the boiler with the gasket and screws provided. • Insert each elbow into its corresponding collar. • Connect each pipe to its corresponding elbow (as shown in the diagram). • Secure end cap on the intake and exhaust pipe outside the house. RIVA PLUS MANUAL...
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• Attach each collar to the boiler with the gasket and screws provided. • Insert each elbow into its corresponding collar. • Connect each pipe to its corresponding elbow (as shown in the diagram). • Secure end cap on the intake and exhaust pipe outside the house. 22 RIVA PLUS MANUAL...
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• Connect exhaust (inner) pipe to concentric elbow. • Connect intake (outer) pipe to concentric elbow. • Secure elbow to boiler using gasket and four screws provided. • Secure end cap on the intake pipe outside the house. RIVA PLUS MANUAL...
The condenste trap is provided with two electrodes: if the drain pipe is plugged or in any case in which the condensate isn’t correctly evacuated, the condensate level in the trap rises putting in contact the electrodes thus causing the boiler lock-out. 24 RIVA PLUS MANUAL...
(as shown in fi gure 12.5) keeping the same connections for the live wire and the neutral wire WARNING Note: Do not connect live wires to thermostat terminals 1-3. Figure 11.5 • Connect the earth wire(yellow/green). Boiler must be wired directly to earth ground on breaker panel. 26 RIVA PLUS MANUAL...
Figure 11.8 • Connect the dry contact switch to termi- • When connecting any type of relay con- nals 1 and 3 shown in Fig. 12.9. trol, the jumper J in Fig. 12.8 must be re- moved. RIVA PLUS MANUAL...
• Route the electrical supply cord and the external control cord as illustrated in Fig. 12.12. Figure 12.12 • Lock the cords in place with the fl exible cord clamps. • Replace the control panel reversing the steps on page 27. 28 RIVA PLUS MANUAL...
23 ft at most. For greater differences, increase the pre-load pressure in the C.h. expansion vessel (17 on page 10) and the system when cold, by 0.1 bar for additional 3.3 ft. For systems with volumes greater than 154l, an additional expansion vessel must be provided. RIVA PLUS MANUAL...
The second method is a hydraulic separator. Hydraulic separators are available commercially; however you can also construct your own. An example of a hydraulic separator is given in Fig- ure 14.2. It is important that the separator be at least 2” in size to ensure proper performance. 30 RIVA PLUS MANUAL...
14. Piping Cont. 13.1 Primary – Secondary Piping: All external piping components are to be supplied by the installer. It is very important to use a hydraulic separator before secondary circulators. RIVA PLUS MANUAL...
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14. Piping Cont. 13.2 Primary – Secondary Piping with Zone Valves: All external piping components are to be supplied by the installer. It is very important to use an hydraulic separator before secondary circulators. 32 RIVA PLUS MANUAL...
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14. Piping Cont. 13.3 Manifold Piping with Zone Valves (shown conn. to radiators): All external piping components are to be supplied by the installer. RIVA PLUS MANUAL...
D will appear. To reset the boiler turn the knob B (fi gure 15.3) on the 0 position and then press and release the boiler reset button C (Fig. 15.3). 34 RIVA PLUS MANUAL...
• Switch on the boiler. points must be sealed. • Check the maximum gas pressure and com- pare the value on the gauge with the value indicated in the Section 2 on page 9 (gas pressures at the burner). RIVA PLUS MANUAL...
(D on Figure 15.3). To reset the boiler turn the knob B (fi gure 15.3) on the 0 position and then press and release the boiler reset button (C on Figure 15.3). 36 RIVA PLUS MANUAL...
Adjust the gas pressure at the burner to the value according to the useful c.h. output wanted (Tab. 15.1). • Reassemble the service panel. • Close the gas valve outlet pressure test point 15 (fi gure 15.5). • Reassemble the front pannel of the case. RIVA PLUS MANUAL...
All the labels supplied with the boiler are numbered for reference. According to Figure 15.10 place all the labels on the boiler. Use label numbered as 1 (already installed in the front panel) to begin the placement in the correct way. 38 RIVA PLUS MANUAL...
(fi gure 16.2) adhesive label (included with the conver- sion kit) indicating the type of gas, and the gas pressures to which the appliance has been set. • Reassemble the front and side panels of the case. 40 RIVA PLUS MANUAL...
• Open the central heating drain cock (F in Fig. 17.3). • Empty the c.h. system. • Close the central heating drain cock (F in Fig. 17.3). • Open the pressure reducing automatic fi ll valve (28 on Section 4) Figure 16.3 RIVA PLUS MANUAL...
• Remove the fi rst elbow from the horizon- • Inspect the venture device inside the out- tal run of the exhaust to the outside. let of the combustion fan. Make sure that it is free of any dirt build up or blockage. 42 RIVA PLUS MANUAL...
• Using pliers, remove the spring D moving it upwards. • Disconnect the wirings from the trap. • Reassemble carrying out the removal op- erations in reverse order. The trap should be serviced once a year dur- ing the annual service. Figure 16.6 RIVA PLUS MANUAL...
17. Vent Part Spares 17.1 Separate venting: For any spare parts, please contact QHT Inc. at 800-501-7697. Description Order Number Twin pipe kit 10999.0393.0 44 RIVA PLUS MANUAL...
18. Vent Part Spares Cont. 17.2 Coaxial venting: For any spare parts, please contact QHT Inc. at 800-501-7697. Description Order Number Coaxial fl ue kit 10999.0387.0 RIVA PLUS MANUAL...
18. Vent Part Spares Cont. 17.3 Roof venting For any spare parts, please contact QHT Inc. at 800-501-7697. Part Description Order Number Roof fl ue kit 10999.0392.0 46 RIVA PLUS MANUAL...