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The iSeries-R is a microprocessor-based valve designed to regulate the supply water temperature to a heating system by modulating 

the position of an iSeries Mixing Valve. The iSeries-R operates the valve to provide outdoor reset to the heating system. A boiler sensor 

installed on the return line to the boiler is used to protect the boiler against flue gas condensation.

Outdoor Reset

In order to properly control a hot water heating system, the heat supplied to the build-

ing must equal the heat lost by the building. 

• The heat supplied to the building is directly proportional to the temperature of the 

water and the surface area of the heating element. The higher the temperature of the 

water flowing through the heating terminal, the higher the heat output. 

• The heat lost from a building is dependent on the outdoor temperature. As the out-

door temperature drops, the building heat loss increases.

These  two  facts  lead  to  the  concept  of  outdoor  reset  which  increases  the  supply 

water temperature as the outdoor temperature drops. Using this approach, the heat 

lost from the building is matched by the heat provided by the terminal units, therefore 
providing more comfort and energy savings.

Reset Ratio

The  Reset  Ratio  sets  the  relationship  between  outdoor  temperature  and  supply 

water temperature. It determines the amount the supply water temperature is raised 

for every 1 degree outdoor temperature drop. For example, if a Reset Ratio of 1.2 

is selected, the supply water temperature is increased by 1.2 degrees of every 1 
degree of outdoor temperature drop.

2-Way / 3-Way Mixing 

An iSeries Mixing Valve may be used to mix the hot boiler water temperature with the cooler return water temperature from the system 

loop. The position of the iSeries Mixing Valve is modulated in order to inject different rates of hot water into the cool system return water. 

This allows for virtually any water temperature to be supplied to the heating system. When deciding between a 2-way or 3-way valve,  

maximum flow rates must be considered. See the charts on page 2 before selecting style of valve / piping.

Most boilers cannot operate at low temperatures, therefore the iSeries-R can be modulated back in order to prevent the boiler from 

operating at cold temperatures, by installing the boiler return sensor.

102-145

Instruction Sheet

i Series - Outdoor Reset (iSeries-R)

2-Way and 3-Way i Series Mixing Valves

SUPERSEDES: New

EFFECTIVE: August 1, 2003

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Содержание i Series

Страница 1: ...mperature drop For example if a Reset Ratio of 1 2 is selected the supply water temperature is increased by 1 2 degrees of every 1 degree of outdoor temperature drop 2 Way 3 Way Mixing An iSeries Mixing Valve may be used to mix the hot boiler water temperature with the cooler return water temperature from the system loop The position of the iSeries Mixing Valve is modulated in order to inject diff...

Страница 2: ...1 5 From the 2 Way Cv chart below select the valve size with the closest Cv value to the injection flow rate calculated in step 4 Do not size the 2 Way iSeries Mixing Valve based soley on pipe size 3 Way iSeries Mixing Valve Selection Select the 3 Way iSeries Mixing Valve based on the 3 way Pressure Drop chart below Sequence of Operation Power Up and Heat Request Whenever the iSeries R is powered ...

Страница 3: ...he minimum setting The minimum setting is selected via DIP switch 3 When the switch is turned on the minimum temperature is set to 120 F and when the DIP is turned off the minimum tempera ture is 135 F When using low temperature boilers such as condensing or electric the boiler minimum temperature may be disabled by powering up the control without a boiler return sensor Whenever the iSeries R is b...

Страница 4: ...able In order to prevent damage to the electronics disconnect all plugs before the power is turned on and check voltages and sensors Once the circuits are tested plug in the ter minals Powering the Control For intermittent operation connect one side of the end switch e g Taco ZVC SR series zone control or thermostat to an external 24 V ac trans former Connect the other side of the zone control s e...

Страница 5: ...eatly simplify troubleshooting of the iSeries R When the control flashes an error message identify the fault and follow standard test ing procedures to confirm the problem If you suspect a wiring fault return to the wiring section on this brochure and carefully check all external wiring and wiring connections Multi Status LED Adjustment of Settings If the outdoor temperature is cold and the buildi...

Страница 6: ... rings EPDM Dimensions Ufnqfsbuvsf Sftjtubodf Ufnqfsbuvsf Sftjtubodf Ufnqfsbuvsf Sftjtubodf Ufnqfsbuvsf Sftjtubodf G D X G D G D G D 41 31 21 1 21 31 41 51 61 71 81 91 1 211 221 231 241 251 261 271 281 291 2 1 311 45 3 34 29 23 8 2 5 21 27 32 38 43 49 54 5 65 71 77 82 88 93 99 4 345 2 7 276 291 229 129 96 473 73 576 57 329 45 669 37 1 2 11 26 422 22 994 3 8 445 6 939 5 776 4 871 4 161 3 5 1 3 156 ...

Страница 7: ...tion 9300 2044RP Strap on Sensor 9300 2052RP Outdoor Sensor iT024Q6A1 Outdoor Reset Actuator iU024Q6A1 Setpoint Actuator Notes 7 2 j jWbmwf Tj f 161 203 186 405 211 2 Dpoofdujpo D Txfbu U Uisfbe Cbmm Uzqf 3 3 Xbz 4 4 Xbz Bduvbups Uzqf S Sftfu T Tfuqpjou ...

Страница 8: ...epair Any Taco product or part not installed or operated in conformity with Taco instructions or which has been subject to misuse misapplica tion the addition of petroleum based fluids or certain chemical additives to the systems or other abuse will not be covered by this warranty If in doubt as to whether a particular substance is suitable for use with a Taco product or part or for any applicatio...

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