Raypak Switch B 21 User Guide

Job:  
TempTracker™  
Engineer:  
Contractor:  
Prepared By:  
Date:  
2- and 4-Stage Controllers  
For Hi Delta® and Raytherm®  
Boilers & Water Heaters  
TempTracker is designed to sequence  
multiple boilers up to four total stages,  
whether it’s one to four on/off boilers, two  
two-stage boilers, or one boiler with up to  
four stages. It is available factory-mounted or  
loose on Hi Delta boilers, and loose on  
Raytherm boilers. This control can be used  
for space heating and hot water supply with  
six application-specific modes to meet  
various applications, including outdoor reset  
for heating systems. It monitors and displays  
inlet and outlet temperatures on all  
applications as well as monitors outdoor  
temperature when an outdoor reset mode is  
utilized.  
Features  
Programmable Functions  
1-4 boilers/stages  
Selectable P or PID logic  
LCD display  
NEMA 1 enclosure  
Boiler-in and boiler-out water sensors  
System water sensor  
6 programming modes  
Adjustable outdoor reset  
Min. system water temperature (70 °F)  
Max. system water temperature  
o Heating – 220 °F  
o DHW – 190 °F  
Outdoor air sensor  
Temperature differential (2 to 42 °F)  
Boiler target (70 to 220 °F)  
Outdoor cutoff (35 to 85 °F)  
Boiler mass (low, med, high)  
Stage-on delay (P mode)  
(10 sec. to 8 min.)  
System pump-off delay (0 to 20 min.)  
Temperature measurement (°F or °C)  
(Models B-27 and B-23)  
Alarm ready (pilot duty)  
24 VAC, 60 Hz, 3 VA Supply Power  
Relay Ratings  
Stage 1: 5A @ 120 VAC  
Stages 2 to 4: 3A @ 120 VAC  
Model Information  
B-26 2-stage setpoint  
B-27 2-stage outdoor reset  
B-21 4-stage setpoint  
B-23 4-stage outdoor reset  
Raypak, Inc. ƒ 2151 Eastman Avenue, Oxnard, CA 93030 ƒ (805) 278-5300 ƒ Fax (800) 872-9725 ƒ www.raypak.com  
Catalog No.: 5100.30A  
Effective: 2-1-08  
Replaces: 8-1-07  
 

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