CleaverBrooks WB, Руководство по эксплуатации и техническому обслуживанию владельца

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750-136
Model WB Electric Boiler Manual 4-1
CHAPTER 4
Operating Instructions
4.1 — Initial Startup
1.
Fill the vessel and the system with water, open the vent at the highest point in the system to allow air evacu-
ation, and close the valve. Start the system circulation pump. Check to see that the system pressure is within
the design range for the boiler and associated equipment.
2.
Set the high limit temperature control. (Suggested setting - 20º F above operating temperature.) The boiler
must not exceed a maximum temperature of 250º F per ASME Code, Section IV.
3.
Set the required temperature on the temperature control. The temperature control on boilers up to 4 stages
(on/off controls) has a 5º F fixed differential. The temperature control on larger boilers has an adjustable pro-
portioning range from 3º F to 30º F, which should be set at 10º F for the initial start. This proportioning range
may require small adjustments later to set the system. The temperature set point is always the center of the
proportioning range.
Proportional Temperature Control
Setpoint: This is the center point of the proportional range.
Range adjustment: The proportional temperature control may be adjusted to vary the temperature range within which proportional
action is desired.
Example: If the temperature of the controlled medium is to be maintained at 130º F, and a proportional action from 125º F to 135º F
(a range of 10º) is desired, adjust the setpoint to 130º F and the proportional range to 10.
On-Off Temperature Control
The differential value is adjusted using the internal potentiometers (see Figure 4-3).
Make certain all pre-start procedures listed in Chapter 3 have been completed prior to reading this chapter. Failure to
heed this warning may result in serious personal injury or death.
Before opening the cabinet doors to gain access to any electrical wiring or controls, lockout and disconnect the
boiler’s main power to avoid the hazard of electrical shock, which could result in serious personal injury or death.
NOTE: Boiler controls may vary depending on boiler model. Consult the appropriate literature
for information specific to your application.
! Warning