Intertek Pinnacle PB150, Инструкция по установке и эксплуатации

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6
BURNER AND CONTROLS
Honeywell L6081A Aquastat Controller
This control is installed on the middle fitting of the domestic coil. These immersion
type controls are used with forced hydronic heating systems, which include domestic
water service. This model provides high limits, low limits for maintaining minimum
boiler water temperature and circulator controls. See the wiring diagram for proper
connections of this unit. The primary control is factory wired to the aquastat
controller. These controls working as a system will prevent the circulator operation if
the water temperature is below a predetermined low level. Likewise, if the water level
reaches a predetermined high limit the burner will automatically shut off.
Low Water Cut-off Switch RB-122
This control is installed in the supply tapping in the top front of the boiler. The RB-122
low water control is specifically designed to provide burner cut-off if there is an unsafe
water loss, which can result from a broken or leaking radiator or pipe, or a cracked
section in the boiler.
SEQUENCE OF OPERATION
Forced Circulation Hot Water System with Tank-less Heater
When the room temperature falls below thermostat setting, thermostat calls for heat
switching the control to full burn mode. When water temperature rises to the preset
temperature setting on the low limit – circulator control the circulator pump is turned
on providing hot water to room zone. At the same time the relay trips and reduces the
burner to pilot mode preventing over temperature. If the circulator pump turns off
because of low water temperature before the room thermostat is satisfied the relay
energizes and switches the burner back to full burn mode to increase the water
temperature. This cycling will continue until the room thermostat is satisfied. When
the room thermostat is satisfied the burner will switch back into pilot mode waiting for
the next heat demand. Because the burner stays in pilot mode between calls for heat,
in extended low demand periods the water temperature may rise enough to turn the
circulator pump on therefore a dump zone should be configured into the system.