Caleffi solar NAS20053 Installation, Commissioning And Servicing Instructions Download Page 14 | Manualshive

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Page 14

Figure 6:

Two tank with solar preheat to indirect boiler fired water heater

SECTION IV: INSTALLATION (cont.)

Figure 6 shows a two tank system based on an indirect water heater and a solar water
heater with electric back up. The stored water in the indirect water heater acts as a
preheat to the space heating loop.

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Summary of Contents for NAS20053

Page 1: ...ctrical heating element for backup heat or boiler backup top coil Solar heat output from the internal coil will vary depending on outside conditions and the temperature of the stored water Models NAS2...

Page 2: ...ons thoroughly before installing or placing the heater into service This unit must be installed by licensed or authorized installers or technical personnel that service water heating equipment The hea...

Page 3: ...nstructions 4 Use this water heater only for its intended use as described in this manual 5 Do not use an extension cord set with this water heater If no receptacle is available adjacent to the water...

Page 4: ...Table of Contents 1 Specifications 5 2 General Information 6 3 Pre Installation 9 4 Installation 10 5 Operation 16 6 Maintenance 17 7 Troubleshooting 18 8 Parts List 19 Page 4...

Page 5: ...tection valve be installed and used according to the manufacturer s directions to prevent scalding Model A B C D E F G H I J K NAS20053 22 48 1 4 39 3 4 39 3 4 31 1 2 16 3 4 6 1 2 n a n a n a n a NAS2...

Page 6: ...58 0 8 NAS20122 108 2 76 1 84 14 14 9 42 0 60 0 40 258 158 1 2 NOTES Based on 5 GPM flow rate Based on solar input of 140 F 2 GPM Depending on model backup heat recovery is calculated with either a 45...

Page 7: ...heater and cannot be adjusted The thermostat is factory set at 120 F See Table 6 for thermostat letter and temperature relationships If hotter water is required a thermostatic mixing device or scald...

Page 8: ...valve certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials as meeting the requirements for Relief Valves and Autom...

Page 9: ...witch do not use any telephone in your building Immediately call your gas supplier from a telephone in another building Follow your gas supplier s instructions If you cannot reach your gas supplier ca...

Page 10: ...ion and shut off valve at both potable water connections All piping should be diameter new copper or larger A thermostatic mixing valve or scald protection valve should be installed at the potable wat...

Page 11: ...ATION cont A piping diagram for a typical solar domestic water heating system based on an indirect water heater with electric heating backup is shown in Figure 3 Figure 3 Single tank system with elect...

Page 12: ...gure 4 Two tank system with existing heater A typical two tank system is shown in Figure 4 The two tank system is mainly used where a conventional water heater is already installed SECTION IV INSTALLA...

Page 13: ...of a domestic solar heating system based on an indirect water heater with two coils The domestic water can be heated by the solar system as well as the boiler Figure 5 Single tank system with boiler b...

Page 14: ...oiler fired water heater SECTION IV INSTALLATION cont Figure 6 shows a two tank system based on an indirect water heater and a solar water heater with electric back up The stored water in the indirect...

Page 15: ...with copper conductors over current protection and means for disconnection must be provided by qualified service personnel The total wattage load and voltage requirements for the water heater are spe...

Page 16: ...led VERY HOT See Table 6 for a listing of indicator setting and temperature relationships CAUTION Hot water in excess of 120 F can cause scalding The temperature at which injury occurs varies with the...

Page 17: ...and at least yearly once a time interval for inspection has been developed It is recommended to check the rod s six months after the heater is installed If the anode rod had reduced in size by two th...

Page 18: ...ection VI for tank flushing procedure Circulator does not operate Check solar controller Replace as necessary Faulty tank thermostat Replace thermostat Insufficient hot water Rust staining bad taste a...

Page 19: ...Bracket 9 Cold Inlet with Diptube 19 Thermostat 10 Anode Rod 20 Heating Element Gasket Table 8 NAS20083 NAS20123 Parts 1 Immersion Well 10 T P Relief Valve 2 Leak Detector 11 Drain Valve 3 J Box Cover...

Page 20: ...Heating Element Gasket Table 8 NAS20083 NAS20123 Parts 1 Immersion Well 10 T P Relief Valve 2 Leak Detector 11 Drain Valve 3 J Box Cover 12 Access Cover 4 J Box Cover w conduit hole 13 Foam Dam Cover...

Page 21: ...e 8 NAS20083 NAS20123 Parts 1 Immersion Well 10 T P Relief Valve 2 Leak Detector 11 Drain Valve 3 J Box Cover 12 Access Cover 4 J Box Cover w conduit hole 13 Foam Dam Cover 5 Anode Rod 14 Thermostat C...

Page 22: ...NOTES Page 22...

Page 23: ...Page 23 NOTES...

Page 24: ...Caleffi North America Inc 3883 W Milwaukee Rd Milwaukee WI 53208 Copyright 201 Tel 414 238 2360 Tel 414 238 2366 Printed in the USA 8...

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