Burnham RTC (Return Temperature Control) Instrukcja Instalacji Pobierz pdf (Strona 7)

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Caution

Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury. It is the

installer’s responsibility to ensure that this control is safely installed according to all applicable codes and standards. This electronic

control is not intended for uses as a primary limit control. Other controls that are intended and certified as safety limits must be placed

into the control circuit. Do not open the control. Refer to qualified personnel for servicing. Opening voids warranty and could result in

damage to the equipment and possibly even personal injury.

STEP ONE

GETTING READY

Check the contents of this package. If any of the contents listed are missing or damaged, please contact your wholesaler or

Burnham representative for assistance.

Burnham RTC includes: Burnham Return Temperature Control, Return Temperature Control manual, 1 boiler return

sensor, 4 #8-32 x ½” Phillips screws.

STEP TWO

INSTALLING THE CONTROL AND RELATED COMPONENTS

A. Return Temperature Control (RTC) – Mount the control to the boiler front jacket panel at the top right. See Figures 1 and 2

for general component placement. The RTC mounting bracket must be attached to the jacket first, using four (4) #8 x ¾” drill point

sheet metal screws. Before attaching the RTC to the mounting bracket, remove the controller from the control base/wiring chamber

by pressing the tab on the base and pulling the controller up and off. (This is to prevent accidental damage to the controller during

the mounting process.) One may find it easier to install some of the conduit connectors, along with their corresponding conduit

runs, onto the RTC control base/wiring chamber before mounting it to the bracket. Before choosing which wiring knockouts to

use, read Step Four. Mount the control base/wiring chamber to the bracket using the four (4) #8-32 x ½” Phillips pan head screws

supplied with the RTC. Then reattach the RTC controller to the control base.

B. Return Sensor – The return water temperature sensor must be mounted in a special 3”NPT x 12” long nipple with ¼” NPT side

tapping supplied by Burnham. Apply pipe dope to special nipple both threaded ends and mount the nipple into the boiler’s right

rear return port (as viewed from the rear of the boiler), so that nipple side tapping end is positioned away from the boiler. Apply pipe

dope to the sensor threads and install the sensor into the nipple ¼” NPT side tapping making sure the connection is watertight. Use

bell reducer (refer to Figure 3 or Figure 4) to adapt to recommended return piping size. See Figure 3 or 4 (depending on the boiler

being installed) for the proper location of the return nipple. See Figure 2 for return sensor wiring details. Run the sensor wiring to a

suitable junction box, using a grommet to protect the leads as they enter the box. Mount the junction box to the boiler’s rear jacket

panel, as shown in Figure 2. Connect the sensor wiring from the junction box to the RTC control at the front of the boiler, using the

appropriate conduit and connectors.

C. Diverting Valve and Actuator – A diverting 3-way or 4-way valve must be installed in the boiler loop piping in order for the RTC

to provide boiler protection. Only a Burnham-approved valve and actuator may be used with the RTC. The diverting valve sizing

depends upon the designed boiler delta T. See Appendix B for proper valve selection. The valve actuator is mounted to the top of

the diverting valve. Position the valve so that the actuator is not on the underside of the valve. Mount and connect the actuator as

illustrated in Appendix C. The electrical connections depend on the valve orientation.

D. Boiler Circulator – A properly selected boiler circulator will maintain a constant and minimum flow through the boiler during

each heat demand. The appropriate circulator must be selected, based upon the designed boiler delta T. See Appendix B for

appropriate boiler circulator selections for 20°F and 40°F delta T applications.

WARNING: IF THE SELECTED BOILER CIRCULATOR IS GREATER THAN 1/3 HP, AN ISOLATION RELAY MUST BE ADDED

WHEN USING THE RTC. IF A 3-PHASE BOILER CIRCULATOR OR A CIRCULATOR WITH AN AMP DRAW GREATER THAN 10

AMP IS SELECTED, AN APPROPRIATE MOTOR STARTER MUST BE USED.

STEP THREE

NEAR BOILER PIPING

When using the RTC control, the boiler loop piping must contain the boiler, the boiler circulator, a 3-way or 4-way diverting valve,

and the return sensor. The boiler loop injects hot water into the primary loop, provided that the boiler return water temperature

(measured by the return sensor) is at least 135°F. If the return temperature is below 135°F, the diverting valve closes, recirculating

boiler supply water through the boiler loop until the return water has been heated to at least 135°F. The RTC controls the diverting

value actuator based upon the absolute return water temperature, as well as the rate of temperature change.

Several typical RTC applications are shown in Appendix A. Select the appropriate application before proceeding.

See Figures 5 and 6 for general component and piping arrangements when using 3-way and 4-way diverting valves. See Figure

3 for V9A piping recommendations for 3-way valve applications. See Figure 4 for V11 piping recommendations for 3-way valve

applications. As shown in these diagrams, the boiler loop’s supply and return are connected to the primary loop through two closely

spaced tees, at a maximum branch centerline distance of four times the primary loop diameter (4 x D Max).

Installation

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