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COMBOMAX
Electric boiler with integrated instantaneous water heater
Models from 8 kW to 24 kW :
2 4 0 V o l t s ( s i n g l e p h a s e )
Use and Care Manual
With installation instructions for the contractor
Your COMBOMAX
provide years of trouble-free service. This manual contains instructions for the safe and
proper installation, operation and maintenance of the boiler, in order to ensure your full
satisfaction
It is imperative that all persons who are expected to install, operate or adjust this boiler read
the instructions carefully.
Any questions regarding the operation, maintenance, service or warranty of this water
heater should be directed to the dealer or distributor you purchased it from. When all
installation steps have been completed, replace this installation manual in its original
envelope, and keep in a safe place near the heater for future reference.
THERMO 2000 INC.
Printed in Canada
MC
®
electric boiler has been carefully assembled and factory tested to
revised : January 2006
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Table of Contents
Summary of Contents for Thermo Products COMBOMAX Models from 8 kW to 24 kW : 240 Volts ( single phase )
- Page 1 COMBOMAX Electric boiler with integrated instantaneous water heater Models from 8 kW to 24 kW : 2 4 0 V o l t s ( s i n g l e p h a s e ) Use and Care Manual With installation instructions for the contractor ®...
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Page 2: Section 1 : Technical Specifications
Section 1 : Technical specifications Table 1: Boiler specifications 240 Vac (single phase) : Model Kw BTU/h COMBOMAX XX-8 COMBOMAX XX-10 COMBOMAX XX-15 COMBOMAX XX-18 COMBOMAX XX-20 COMBOMAX XX-24 Table 2 : Boiler and connection dimensions Model Combomax 23 Combomax 34 Combomax 44 Combomax 64 Table 3 : Domestic hot water production capacity in US gallons... - Page 3 DESSIN D'ATELIER / GENERAL DIMENSIONS COMBOMAX XX-XX Figure 2 DIMENSION/ DIMENSIONAL Modèle/ Model COMBOMAX 23-XX 49 3/16 COMBOMAX 34-XX 65 1/2 COMBOMAX 44-XX 57 3/4 COMBOMAX 64-XX 65 1/2 Page 3 Legeng/Légende: 1) Boiler Water Supply Connection / 2) Boiler Water Return/ 3) Domestic Water inlet / 4) Domestic Water outlet/ 5) Safety relief valve/...
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Page 4: General Safety Precautions
Be sure to read and understand the entire Use & Care Manual before attempting to install or operate this water heater. Pay particular attention to the following General Safety Precautions. Failure to follow these warnings could cause property damage, bodily injury or death. Should you have any problems understanding the instructions in this manual, STOP, and get help from a qualified installer or technician. -
Page 5: Section 3 : Installation
Section 3 : INSTALLATION WARNING The manufacturer’s warranty does not cover any damage or defect caused by installation or attachment or use of any special attachment other than those authorized by the manufacturer into, onto, or in conjunction with the water heater. The use of such unauthorized devices may shorten the life of the water heater and may endanger life and property. - Page 6 Install shutoff (ball) valves for servicing convenience. Install thermometers on the inlet and outlet lines. Never plug the pressure relief valve to avoid creating a hazardous situation. 3.5.2 Flow-check valve If the heating system uses a single circulator, a flow-check valve must be installed to minimize gravity flow and heat loss during non- draw periods.
- Page 7 Pump flow rate = Boiler output ÷ BWTD ÷ 500 • Pump flow rate is expressed in U.S. gallons per minute or GPM. • The Boiler output ( in net BTU per hour) is the maximum amount of heat to be transferred through the heating circuit to meet the hot water demand.
- Page 8 cold water supply line between the COMBOMAX unit and flow check valve. Contact your installing contractor, water supplier, local plumbing inspector or plumbing supply house for assistance. 3.6.3 Recirculation line (if applicable) If a recirculation line is installed, the return connection should be made to a tee close to the inlet connection on the water heater.
- Page 9 3.11 BI-ENERGY SETUP To take advantage of a special domestic electric utility rate, your COMBOMAX boiler can be combined with an existing oil or gas-fired furnace. Please contact your utility to make sure your building is eligible and to find out about the new wiring configuration.
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Page 10: Section 4 : Operation
SAFETY PRECAUTIONS Before operating this water heater, be sure to read and follow these instructions, as well as the warnings printed in this manual. Failure to do so can result in unsafe operation of the water heater resulting in property damage, bodily injury, or death. - Page 11 Adjust the boiler aquastats as required. Please note that lowering the setting will not have an immediate effect as the heat stored in the boiler water must first be consumed. Check the boiler water temperature periodically. Further adjustments may be required as the system goes through several space and water heating cycles.
- Page 12 4.6 ADJUSTING THE MIXING VALVE A thermostatically controlled mixing valve works automatically thanks to the thermostatic element controlling the mix of very hot and cold water as required to provide safe domestic hot water under variable conditions. To adjust the mixing valve setting, carefully open a hot water tap.
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Page 13: Section 5 : Maintenance
Regular boiler maintenance will ensure trouble- free service for many years. It is recommended that you set up and follow a maintenance program. All components fail eventually. The use of incorrect replacement parts or disregarding safety procedures and warnings during repairs may reduce the boiler safety level and shorten its useful life. - Page 14 Be sure to read and understand the entire Use & Care Manual before attempting to install or operate this COMBOMAX Precautions. Failure to follow these warnings could cause property damage, bodily injury or death. Should you have any problems understanding the instructions in this manual, STOP, and get help from a qualified installer or technician.
- Page 15 THERMO 2000 inc. COMBOMAX Schéma d'installation général/ General installation Simple Zone/ Single Zone Tuyauterie chauffage/ Boiler piping Tuyauterie eau domestique/ Domestic piping Manomètre & thermomètre/ Manometer & thermometer Valve anti-gravité/ Flow check valve Valve de sécurité (T&P) Safety valve (T&P) Vase d'expansion/ Expansion tank Valve à...
- Page 16 THERMO 2000 inc. COMBOMAX Schéma d'installation général/ General installation Système multizones (valves)/ Multi-zone system using valves Tuyauterie chauffage/ Boiler piping Tuyauterie eau domestique/ Domestic piping Manomètre & thermomètre/ Manometer & thermometer Valve anti-gravité/ Flow check valve Valve de sécurité (T&P) Safety valve (T&P) Vase d'expansion/ Expansion tank...
- Page 17 THERMO 2000 inc. COMBOMAX Système primaire/secondaire Primary/Secondary system Système multizones / Multi-zone system Tuyauterie chauffage/ Boiler piping Tuyauterie eau domestique/ Domestic piping Manomètre & thermomètre/ Manometer & thermometer Valve anti-gravité/ Flow check valve Valve de sécurité (T&P) Safety valve (T&P) Vase d'expansion/ Expansion tank Valve à...
- Page 18 Figure 5 Légende/ Legend Aquastat Élément chauffant/ Heating element Contacteur de puissance Power relay Haute limite Hi-Limit Circulateur/ Thermostat Circulator Page 18 Diagramme électrique/ Wiri ng diagram COMBOMAX 240V Modèle/Model 6 - 10 KW Relais Relay Lampe témoin Pilot light Fusible Fuse Cablage en usine/...
- Page 19 Figure 6 Légende/ Legend Aquastat Élément chauffant/ Heating element Contacteur de puissance Power relay Haute limite Hi-Limit Thermostat Page 19 Diagramme électrique/ Wiri ng diagram COMBOMAX 240V : modèle/ model 15 - 24 KW Relais Relay Voir/see note 2 Lampe témoin Pilot light Fusible Fuse...
- Page 20 Contrôle Bi-énergy/ Dual control ener gy CBE-EM Sonde extérieur/ Outdoor sensor Interrupteur DPDT Switch ON-OFF-ON Cablage en usine/ Factory wiring Cablage pa r l'installateur/ Wiring by others 120 Vac Transfo 24 Vac Sonde extérieur/ Outdoor sensor Page 20 Figure 7 Diagramme électrique/ Wiri ng diagram 120 Vac Transfo...
- Page 21 THERMO 2000 inc. COMBOMAX Schéma d'installation général/ General installation Bi-énergie avec Valve 3 Voies/ Dual Energy with 3-way valve Tuyauterie chauffage/ Boiler piping Tuyauterie eau domestique/ Domestic piping Manomètre & thermomètre/ Manometer & thermometer Valve anti-gravité/ Flow check valve Valve de sécurité (T&P) Safety valve (T&P) Vase d'expansion/ Expansion tank...
- Page 22 Diagramme électrique/ Wiri ng diagram Raccordement de zone valves/ Wiring for zoned va lves system Thermostat Zone 1 Zone valves 24 Vac Transfo 40Va Transfo (3 zones) 20Va Transfo (2 zones) 120 Vac Raccordement de multiples circulateurs/ Wiring for m ultiple circulators Electrical service Thermostat Zone 1...
- Page 23 Aquastat Aquastat Priorité DHW/ Élément no. 4/ DHW priority Element no. 4 (Sugg: 160F) (Sugg: 165F) Bornier valve 3 voies/ 3 way valve terminal block Bornier/ Terminal block (Pompe/ Pump) Transformateur contrôle/ Transformer Control Fusible contrôle/ Control Fuse THERMO 2000 inc. Panneau de contrôlel/ Control pannel COMBOMAX 240V...
- Page 24 COMBOMAX LIMITED WARRANTY Warranty Coverage for Residential Installation. Thermo 2000 Inc. hereby warrants to the original residential purchaser that the COMBOMAX tank and exchanger (coil assembly) installed in a residential setting shall be free of leaks during normal use and service for a period of fifteen (15) years from the date of purchase as long as the original residential purchaser owns the home in which the unit was originally installed, the ten (10) years in full and years eleven (11) through fifteen (15) prorated 20% each year at suggested retail price.