Raypak Temp-Tracker Specifications download pdf (Page 4)

4 Raypak, Inc.

HTC# 059105-00D

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The Modulation PID logic provides the capability of controlling multiple modulating current or voltage boilers. When heat is

required, the control PID will activate the lead boiler and start its purge. See "Purge Delay" on page 33. This will be followed by the

initiation of its modulation at the Ignition %. See "Ignition %" on page 41. After the Purge period and when additional heat is needed,

the control shall start to increase the lead boiler modulation until the Modulation Start % has been reached. See "Modulation Start %"

on page 41. That shall be followed by the lag boiler purge initiation. The lead boiler shall resume its modulation while the lag boiler is

in purge until the lead boiler reaches full re (100% modulation). Any additional heat requirements will trigger the control to increase

the lag boiler modulation.

When the Temp Tracker mod+ Hybrid PID requires reduced output, it will reduce the modulation of the lag boiler until it reaches its

Ignition %. That shall be followed by the reduction of modulation of the lead boiler until it reaches 40% percent of the Modulation

Start %. This shall trigger the control to turn off the lag boiler. The control will keep reducing the lead boiler modulation until it

reaches its Ignition %. If the Last Stage Hold was activated, the control will hold the lead boiler at the Ignition % until the System

Temperature exceeds the Target Set Point by the Last Stage hold setting. See "Last Stage Hold" on page 34.

For Modulating boilers, See "Boiler Type" on page 20. Also, See "Modulating Boiler Settings" on page 24.

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The Staging PID control logic is primarily used with multi-stage boilers. The logic will utilize two primary settings to add or subtract

stages. The Reaction Time is used to turn on/energize stages. See "Reaction Time" on page 36. The Minimum Runtime is used to turn off/

de-energize stages. See "Minimum Runtime" on page 36. A call for heat, by either closing the TSTAT input or opening the SHUTDOWN

input while the outdoor temperature is below the Outdoor Cutoff, will trigger the Temp Tracker mod+ Hybrid to turn on/energize the lowest

ring stage of the Lead Boiler to start its Purge. See "Purge Delay" on page 33. After the elapse of the purge period, the Temp Tracker

mod+ Hybrid will start calculating the Reaction Period. If after a full Reaction Time the control logic foresees the need for additional

stages, the TempTracker mod+ Hybrid will energize the following stage. If that stage was another boiler, that boiler has to go through a

full Purge Delay before starting to calculate the Reaction Time for that stage. Otherwise, if the next stage was the higher ring stage on

the same boiler, the Reaction Time will start from the moment the higher ring stage relay is energized.

When the Temp Tracker mod+ Hybrid PID logic foresees that the system will overshoot, regardless of the current system and

target values, it will make sure that the last stage turned on/energized has elapsed a full Minimum Runtime before it is turned off/

de-energized. Except for the lead stage, no additional stages will be turned off/de-energized until another full Minimum Runtime is

elapsed. On the other hand, if the last stage is a lead stage, it will remain energized until the system reading exceeds the target set

point by the Last Stage Hold value in addition to satisfying the Minimum Runtime condition. That is, if the Set Point was 150°F and

the Last Stage Hold was set to 10°F, the lead stage will remain energized until the system reaches 160°F and a full Minimum Runtime

elapses. This is useful in protecting the lead stages from short cycling.

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Raypak Temp-Tracker Specifications Page 4