BOILER INSTALLATION, OPERATION INSTRUCTIONS Riva PLUS COMBI 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 fire or explosion may result causing property damage, personal injury or loss of life. —— Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
Dear Customer: Thank you for buying a Biasi Riva Plus Combi. The Riva Plus Combi is a high efficiency condensing, wall mounted gas boiler which provides central heat supply water. We realize that it is not possible to answer all questions about the Riva Plus Combi system in this manual. Reading this installation manual does not make the reader an expert in all aspects of installation and operation, and does not replace the need for a qualified, licensed heating contractor.
Table of Contents Section Title Section Number Warnings Important Information General Information Technical Information (M135.
Table of Contents Section Title Section Number Commissioning Initial Filling of the System Lightning the Boiler Checking the Gas Pres. at the Burner Adjustment of the Gas Pressure Checking the Ignition Device Checking the Burner Ignition Setting the outdoor reset K coefficient Adjustment of temperature WITH the outdoor temperature probe connected Adjustment of the Useful C.h.
WARNING Boiler is certified as an indoor appliance. Do not install boiler outdoors or locate where it will be exposed to freezing temperatures. WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. —— Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. —— WHAT TO DO IF YOU SMELL GAS • Do not try to light any appliance.
WARNING Any appliance that burns natural gas, propane gas, fuel oil, wood or coal is capable of producing carbon monoxide (CO). Carbon Monoxide (CO) is a gas which is odorless, colorless and tasteless but is very toxic. CO is lighter than air and thus may travel throughout the building. BRIEF EXPOSURE TO HIGH CONCENTRATIONS OF CO, OR PROLONGED EXPOSURE TO LESSER AMOUNTS OF CO MAY RESULT IN CARBON MONOXIDE POISONING.
IMPORTANT INFORMATION Please read this page carefully. • ALL BOILERS MUST BE INSTALLED IN ACCORDANCE WITH NATIONAL, STATE AND LOCAL PLUMBING, HEATING AND ELECTRICAL CODES AND ORDINANCES, AS WELL AS THE REGULATIONS OF THE SERVING ELECTRICAL, WATER AND GAS UTILITIES. • All systems should be designed by competent contractors, and only persons knowledgeable in the layout and installation of heating systems should attempt the installation of any boiler.
1. General Information The Riva Plus Combi is a high efficiency 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 10. All units are pressure and combustion tested at the factory prior to shipping. Key Features: • Wall mountable - saving valuable floor space.
2. Technical Information Cont. GAS FLOW RATE ENERGY CAPACITY Nominal heat input (0/2000 ft) Nominal heat input (2000/4500 ft) Minimum heat input Maximum useful output (0/2000 ft) Maximum useful output (2000/4500 ft) Minimum useful output MBH 116.0 Gas Natural MBH 110.2 Propane MBH 49.5 MBH 102.0 MBH 97.2 MBH 41.6 GAS SUPPLY PRESSURE Gas Normal Min Max Natural inwc 7.0 3.5 10.5 Propane inwc 11.0 8.0 13.0 Min Max Ignition Natural inwc 1.0 4.8 2.4 Propane inwc 2.0 10.
3. Parts List Primary Components: 19 13 35 12 25 26 10 34 11 9 8 28 7 5 3 6 33 23 27 21 18 20 4 2 1 10 RIVA PLUS COMBI MANUAL 1 Pump 2. Pump vent plug 3. Automatic air purger valve 4. Modulation gas valve 5. Flame-detecting electrode 6. Ignition electrodes 7. Burner 8. Combustion chamber 9. Primary heat exchanger 10. Fan 11. Air pressure switch 12. Air switch pres. Test points 13. Safety thermostat 14. Modulation operator 15. Gas valve outlet pres. Test point 16. Gas valve inlet pres.
4. Internal Piping & Parts List 26 35 25 34 24 9 10 19 11 28 5 36 7 6 3 15 1 4 14 16 33 18 20 17 39 23 38 37 31 21 22 40 41 29 30 32 Note: Pressure Relief Valve (#22) should be piped to a drain or to the floor as close as possible to a drain. Note: Figure is not intended to be a piping diagram, please refer to piping section of manual for piping practices and locations.
5. Electric Diagrams Fan Electric supply terminal block External controls temninal block L Safety thermostat Flue thermostat or Air pressure switch Ignition electrodes NO NC wh N bn rd bu M ~ 3 2 1 bn gny e COM wh bk bu wh rd Flame detection electrode gy gnye bu ye wh bu bk gy rd gnye rd eyng bu bn eyng ye bk wh gy bu or rd wh gy bk wh bk rd bk rd bu bu bu bu rd bu bk bk gy gy bn bu gy gnye rd rd rd wh bu gy wh bu bk J10 bk rd rd bu rd wh bk rd bu D.h.w.
5. Electric Diagrams Cont. 5.
6. Installation Location The installation location chosen must: • Comply with all clearances listed below. • Provide suitable location for the exhaust and intake venting. • Not be installed in an unheated space. • Comply with all local codes and standards. Note: Dimensions shown are minimums. Greater clearances will simplify installation and service. 15.2 in 10.0 i n 3.0 in 2.0 i n CLOSET INSTALLA TION 2.0 i n MINIMU M PER MANAN T CLEARANCE 31.6 in 1 8 . 0 in 8 .0 in CLOSET INSTALLA TION 1 5 .
7. Exhaust Pipe Location CAUTION EXTERNAL VENT SURFACES ARE HOT. IT IS RESPONSABILITY OF THE HOMEOWNER TO KEEP THE VENT 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. The exhaust hood must be installed on the leeward side of house and conform to the following guidelines: 1.
8. Mounting Bracket After a suitable installation location is chosen, verify that the mounting wall is properly braced and strong enough to support the 110 pound weight of the unit when filled with water. NOTE: The boiler shall be installed such that the gas ignition system components are protected from water and liquids in general (dripping,spraying, rain, etc) during the appliance operation and service. Use the paper template provided with the boiler to determine the location of the mounting bracket.
9. Venting The Riva Plus Combi is a mechanical draft, side wall vented boiler. There are two side wall flue options available – separate and coaxial. The coaxial option has one configuration shown on the next page. The separate option has two possible configurations shown on the following pages. There is also a vertical roof venting option. Regardless of what vent kit is installed, they should all conform to the Provisions for combustion and ventilation air in accordance with section 5.
9. Venting Requirements for the State of Massachusetts The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00 and 5.00 for installation of through – the – wall vented gas appliances as follows: (a) For direct-vent appliances, mechanical-vent heating appliances or domestic hot water equipment, where the bottom of the vent terminal and the air intake is installed below four feet above grade the following requirements must be satisfied: 1.
9. Venting Cont. Separate 3.25/3.25 Restrictor Size Coaxial 2.5/4.0 From 3.30 to 49.2 ft (in+out) 55 From 0 to 3 ft (in+out) From 49.3 to 100 ft (in+out) No restrictor From 3.1 to 9 ft (in+out) Restrictor Size No restrictor In general, it has to be taken in to consideration that the horizontal sections of the flue pipe must hand a horizontal slope not less than 1.5 degrees (0.3 inches per foot) towards the boiler.
9. Venting Cont. 9.3 Choice of flue: The following flue kits are available for connecting to the boiler: A Standard coaxial horizontal flue kit (exhaust & intake outside) Figure 9.1 (Coaxial 2.4/4.0 inches – nominal length 3.3 ft) It can be mounted to allow discharge to the rear or either side of the boiler via the flanged boiler adapter elbow. Minimum length required is 2.9 ft. Maximum equivalent length of 8.8 ft can be achieved utilizing extensions.
9. Venting Cont. B Standard separate horizontal flue kit (Exhaust & intake outside) Figure 9.2 (Twin pipe Ø 3.25 in) Various twin (split) pipes kits and optional accessories (elbows) are available to assist in the termination of the flue where the boiler is installed in a location remote to an outside wall. These kits allow for separation of the air supply pipe from the pipe that discharges the exhaust gasses.
9. Venting Cont. C Alternative separate kit (exhaust outside & intake inside) Figure 9.3 (Twin Pipe Ø 3.25 in) This configuration of the twin pipe kit allows to discharge the exhaust gasses outside. The air supply is obtained with an air intake pipe. This allows to take air from the room where the boiler is installed. If either an additional 45° or 90° accessory elbow is used then the maximum permissible length of either pipe must be reduced by 3.0 ft or 5.4 ft respectively.
9. Venting Cont. D Standard Vertical-roof kit (exhaust & intake outside) Figure 9.4 (vertical pipe Ø 3.1 / Ø 4.9 in) This kit allows vertical termination of the flue pipe through the roof. The kit is 1.2 min length. Extension pieces (Co--axial) are also available which allows the flue system to be extended to a total overall maximum permissible length. Optional 45° and 90° elbows can be used to offset the flue route.
9. Venting Cont. E PVC vent requirements All piping that is used to vent the Riva boiler must conform to the standards listed below. Parts Exhaust and Intake Piping Pipe Cement / Primer Material PVC CPVC PVC CPVC United States ANSI/ASTM D1785 ANSI/ASTM DF441 ANSI/ASTM D2564 ANSI/ASTM F493 Canada ULC S636 It is not permitted to use a cellular foam core pipe for venting the Riva boiler. All intake piping can be constructed of PVC pipe. The first 8 feet of exhaust pipe must be CPVC pipe.
9. Venting Cont. 12. F PVC boiler adapter A B C D Figure 9.5 This kit is required to vent the Riva boiler using PVC/CPVC pipe. The kit includes a boiler connection adapted for PVC/CPVC. When venting with PVC/CPVC this boiler adapter is required in addition to one of the terminations on the following pages. Canada: All PVC/CPVC pipe, fittings, and cement must be approved to ULC S636.
9. Venting Cont. G PVC concentric vent kit Figure 9.6 This kit allows horizontal termination of the flue pipe using PVC/CPVC pipe. The kit includes boiler connection and termination adapted for CPVC/PVC. 3” PVC/CPVC pipe may be added up to the total overall maximum permissible length of 100’ intake and exhaust combined. Optional 45° and 90° elbows can be used to offset the flue route.
9. Venting Cont. H PVC roof vent kit Figure 9.7 This kit allows vertical termination of the flue pipe using PVC/CPVC pipe. The kit includes boiler connection and termination adapted for CPVC/PVC. 3” PVC/CPVC pipe may be added up to the total overall maximum permissible length of 100’ intake and exhaust combined. Optional 45° and 90° elbows can be used to offset the flue route.
9. Venting Cont. I PVC separate vent kit Figure 9.8 This kit allows horizontal termination of the flue pipe using 3” PVC/CPVC pipe. The kit includes PVC/CPVC boiler adapters and CPVC termination. PVC pipe may be added up to the total overall maximum permissible length. Optional 45° and 90° elbows can be used to offset the flue route. Each additional elbow reduces the overall acceptable length of the flue system as follows: Venting Specifications Max Length (intake + exhaust) 100 ft. 45° elbow 1.6 ft.
10. Pipe Connections The Riva Plus Combi is supplied with a 3/4” stainless steel gas pipe (A in figure 10.1), 2 - 3/4” copper pipe (C, D in figure 10.1), 2 - 1/2” (E, F in figure 10.1) located in a plastic bag in the boiler package. B G C F A E A) B) C) D) E) F) G) Stainless steel gas pipe Main circuit drain cock C.h. supply copper pipe C.h. return copper pipe D.h.w. cold inlet pipe D.h.w. hot outlet pipe Condensate trap D Figure 10.
11. Gas Pipe Connections Gas supply piping is to be sized and installed properly in order to provide a supply of gas sufficient to meet the maximum demand without undue loss of pressure between the meter and the boiler. Consult with the National Fuel Gas Code ANSI Z223.1 for proper sizing of gas piping for various lengths and diameters.
12. Electrical Connections/Wiring 12.1 Power Connection: Removing Side Panel: • Remove screws B A • • A C C B B Move the lower part of the side panels (Figure 12.3). Pull the control panel. When completely pulled out, the panel can rotate 45° downward. D D B B D Figure 12.2 Removing Service Panel: • Remove screws C. Figure 12.1 Removing Front Panel: • Remove the front panel by removing screws A and sliding the front panel up and away from the boiler • Figure 12.
12. Electrical Connections/Wiring Cont. 12.3 Room Thermostat Connection: • The room thermostat must be connected to the terminal block situated next to the control panel. To fused spur isolation switch L N Power supply terminal block J 3 2 • When connecting any type of external control, the jumper J in Fig. 12.6 must be removed. • The room thermostat must be connected to the “Control Terminal Block” (Fig 12.7).
12. Electrical Connections/Wiring Cont. 12.5 Zone Valve Micro Switch Connection: • The zone valve micro switch must be connected to the terminal block situated next to the control panel. To fused spur isolation switch L Zone Valve Room Thermostat V T N N Power supply terminal block J 3 2 L 1 External controls terminal block 3 1 120 VAC Control Terminal Block 120 VAC Control Terminal Block Figure 12.10 Figure 12.11 • When connecting the zone valve switch, the jumper J in Fig. 12.
12. Electrical Connections/Wiring Cont. 12.7 Installing the outdoor reset temperature probe: The outdoor reset temperature probe must be installed on an external wall of the building, avoiding: • Direct sun radiation. • Wet walls or walls where mould tends to form. • Installation near fans, exhaust or chimney vents. 12.
13. Circulator Sizing 13.1 Circulator capacity as a function of flow rate: Figure 13.1 The hydraulic specification in Fig 13.1 represents the pressure (available head for the central heating system) as a function of the flow rate. The pressure loss due to the internal piping in the boiler has already been subtracted. When determining proper piping of the heating system, verify that the internal boiler circulator will overcome the head loss of the system at the designed flow rate using the graph above.
14. Piping All external piping components are to be supplied by the installer. It is very important to use a primary secondary piping scheme when an external circulator will be used. Also, when the boiler is piped in a primary secondary manner, it is necessary to use the central heating flow restrictor supplied with the boiler. The flow restrictor ensures there will be enough back pressure to make the central heating flow switch in a low head loss piping system like primary secondary.
14. Piping Cont. 14.1 Primary – Secondary Piping: All external piping components are to be supplied by the installer. It is very important to use an hydraulic separator before secondary circulators. All external piping components are to be supplied by the installer. It is very important to use a hydraulic separator before secondary circulators. Figure 14.
14. Piping Cont. 14.2 Primary – Secondary Piping with Zone Valves: All external piping components are to be supplied by the installer. It is very important to use a hydraulic separator before secondary circulators. Figure 14.
14. Piping Cont. 14.3 Manifold Piping with Zone Valves (shown conn. to radiators): All external piping components are to be supplied by the installer. Figure 14.
15. Commissioning 15.1 Initial filling of the system: • Remove the front panel of the case. • Lift the cap on the automatic air purger valve 3 (Fig 15.1) one full turn and leave open permanently. • Purge the air from the pump by unscrewing the pump plug 2 (Fig. 15.1); release the pump by turning the rotor in the direction indicated by the arrow on the information plate. • Close the pump plug. • Continue filling the system. The actual reading should ideally be 1.3 bar (19 psi) and not less than 0.3 bar (4.
15. Commissioning Cont. The boiler will now go through an ignition sequence and the burner will light. If during the ignition attempt period the boiler fails to light, the full sequence control p.c.b. will go to lockout and the lock-out signal lamp E will appear. To reset the boiler turn the knob C (figure 15.2) on the 0 position and then press and release the boiler reset button D (Fig. 15.2). 15.
15. Commissioning Cont. 15.4 Adjustment of the gas pressure: • Remove the front panel of the case. • Take off the lid of the sealed chamber. • Open the gas valve inlet pressure test point (16 in Fig. 15.4) at the valve input, connect a suitable pressure gauge and check the gas pressure of the supply network. • Remove the gauge and close the pressure test point 16. • Open the gas valve outlet pressure test point (15 in Fig. 15.4) and connect the gauge. • Figure 15.4 • Remove the protection cap I (Fig. 15.
15. Commissioning Cont. 15.6 Checking the burner ignition: • Turn the boiler OFF. • Open the gas valve outlet pressure test point 15 (figure 15.4) and connect the gauge. • Turn the boiler ON positioning the function selector B in the position shown in figure 15.6 and ensure that the room thermostat is set to “heat demand”. • Repeat this process two to three times leaving 30 second intervals between each ignition.
15. Commissioning Cont. 15.7 Setting the outdoor reset K coefficient: The boiler is set with a K coefficient equal to zero for boiler operation without a connected probe. C.h. flow temperature °F K=3 K=2.4 K=1.9 K=1.5 K=1 185 When the outdoor reset temperature probe is installed, this parameter must be set based on the heating system efficiency to optimise the supply temperature (Figure 15.9). Ex.
15. Commissioning Cont. 15.9 Adjustment of the useful c.h. output: • Turn the boiler OFF. • Open the gas valve outlet pressure test point 15 (figure 15.4) and connect the gauge. • Turn the boiler ON positioning the function selector B in the position shown in figure 15.6 and ensure that the room thermostat is set to “heat demand”. • Loosen screws D and remove the service panel (figure 15.7). • To carry out the adjustment use the adjustment device (RISC) with the help of a screwdriver.
15. Commissioning Cont. Warning: The installation is not complete unless labels supplied are placed on the boiler as shown in Figure 15.11. All the labels supplied with the boiler are numbered for reference. According to Figure 15.11 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. 15.11 Checking the flue system and combustion: • The flue system should be visually checked for soundness.
16. Gas Conversion WARNINGS: Procedures to adapt the boiler to the type of gas available must be carried out by a competent and responsible person. Components used to adapt it to the type of gas available must be genuine parts only. Procedures: • Check that the gas cock (30 on Section 4) fitted on the gas supply pipe is turned off and the appliance is switched off at the circuit breaker. • Remove the front and side panels of the case (see the section 17.
17. Annual Maintenance 17.1 Warnings: The procedures detailed in this chapter must be carried out only by a professionally qualified person. Thus you are advised to contact an Authorised Service Agent. For efficient and continuous operation of the boiler you are advised to have, at least once a year, maintenance and cleaning done by an Approved Service Person.
17. Annual Maintenance Cont. 17.4 Emptying the Domestic Hot Water circuit • Close the inlet valve • Open the system domestic hot water valves 17.5 Cleaning the primary heat exchanger: Follow the instructions for removing the external panels from 17.2. Remove the nine screws labelled C in figure 17.4. Now you will have complete access to the combustion chamber. The sloping and multi-gas type burner (7 on page 10) does not need special maintenance, but it is sufficient to dust it with a bristle paintbrush.
17. Annual Maintenance Cont. 17.8 Checking the pressurization in the expansion vessel: Empty the central heating system as described in section 17.3 of this chapter and check that the pressure in the expansion vessel is not less than 1 bar (14.5 psi). See also section 13.2 of this manual. If the pressure should be lower, take steps to correct the pressure level. To check the pressure at the venturi device, use the test points (12 on page 10).
18. Vent Part Spares 18.1 Separate venting: For any spare parts, please contact QHT Inc. at 800-501-7697. Description Order Number Twin pipe kit 10999.0393.
18. Vent Part Spares Cont. 18.2 Coaxial venting: For any spare parts, please contact QHT Inc. at 800-501-7697. Description Order Number Coaxial flue kit 10999.0387.
18. Vent Part Spares Cont. 18.3 Roof venting For any spare parts, please contact QHT Inc. at 800-501-7697. Part Description Order Number A Roof flue kit 10999.0392.
18. Vent Part Spares Cont. 18.4 Separate PVC venting: For any spare parts, please contact QHT Inc. at 800-501-7697.
18. Vent Part Spares Cont. 18.5 PVC Sidewall venting: For any spare parts, please contact QHT Inc. at 800-501-7697.
18. Vent Part Spares Cont. 18.6 PVC Roof venting: For any spare parts, please contact QHT Inc. at 800-501-7697.
19. Installer Notes System Checkout: Boiler Model No. ___________________ Serial No.
RIVA PLUS COMBI MANUAL
2212 60A4 USA N 17962.1481.
