Harsco Industrial P-K THERMIFIC N700, Инструкция по установке и эксплуатации

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P-K THERMIFIC
®
Gas-Fired Boiler
36
3.10.2 Operating Temperature Controller for Lo-Hi-Lo P-K THERMIFIC
®
Boiler
The Lo-Hi-Lo boiler is operated by a two stage temperature control that
measures the outlet water temperature. The two stages of this boiler are
operated by programming both relay set points and both differentials into
the operating controller. Relay 1 turns the boiler on or off. Relay 2 is for
high and low fire operation. The boiler will turn on at or below Relay 1
Setpoint minus its differential and turn off at Relay 1 Setpoint. The Hi fire
operation of the boiler is energized at or below Relay 2 Setpoint minus its
differential and de-energized at Relay 2 Setpoint.
Example:
Relay 1: Setpoint of 180ºF with a 20ºF differential
Relay 2: Setpoint of 170ºF with a 15ºF differential
Boiler will turn off at 180ºF and turn back on at 160ºF (180ºF - 20ºF).
When boiler temperature reaches 170ºF, unit will modulate to Low Fire. If
boiler does not reach 180ºF, it will continue to fire at Low Fire until tem-
perature drops to 155ºF (170ºF - 15ºF). It will then modulate to Hi Fire.
NOTICE!
The set points and differentials should be adjusted for system requirements. Contact your
local Harsco Industrial, Patterson-Kelley service representative for assistance adjusting your Lo-Hi-Lo
operating temperature control to meet system requirements. Record settings in the following
programming worksheet for future reference.
Programming the Honeywell T775B2032
Relay 1:
SETPOINT _____________
DIFFRNTL _____________
Relay 2:
SETPOINT _____________
DIFFRNTL _____________
Turn the boiler ON. The controller will display the HOME
screen similar to one shown (right). The home screen consists
of three (3) primary areas, the menu area (top), data area
(middle) and 6 button keypad (bottom).
MENU AREA: The LCD displays the relays that are
configured and whether or not they are active. On the unit
furnished by PK, there should be two relays configured and
active (ON).
DATA AREA: The LCD displays the sensors and output
status. On the T775B, there should be one sensor (labeled
Sensor A) with the current sensed temperature displayed. At the bottom of the DATA AREA, there should
be a statement indicating DI OFF, meaning all digital input options are turned off.