AERCO Electronic Controls System (ECS) - Manual (Page 39)

Electronic Control System (ECS) and Type CXT-E Valve
6. ROUTINE MAINTENANCE
VD2: 02/28/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 Page 39 of 82
AC-105 OMM-0003_0D
5) Install a valve and hose connection in the outlet piping of the heater (Figure 6-3) and route
the hose back to the top of the circulation bucket.
CIRCULATED HYDROSKRUB SOLUTION
FROM TOP OF HEAT EXCHANGER INTO
BUCKET
NOTE: IF A HOSE CONNECTION IS NOT
AVAILABLE IN THE HOT WATER OUTLET
PIPING, UNUSED PORT AT THE TOP OF
THE HEAT EXCHANGER, IF AVAILABLE,
MAY BE USED.
HYDROSKRUB SOLUTION CIRCULATED
FROM THE BOTTOM OF BUCKET TO THE
DRAIN CONNECTION OF THE HEAT
EXCHANGER.
CLOSE THE
COLD WATER INLET
ISOLATION VALVE
CLOSE THE
HOT WATER OUTLET
ISOLATION VALVE
DRAIN VALVE
HOSE CONNECTION
CIRCULATING
BUCKET
Figure 6-3. Sample HydroSkrub Pumping System Set-Up for Double-Wall Heater
6.4.2 Cleaning Procedure:
1) Slowly add the prescribe amount of the Hydroskrub solution to the circulating bucket.
2) Open the drain and outlet hose connection valves and turn on the pump. Periodically check
for leaks and maintain the liquid level in the bucket. A lowering volume level is an indication
that there is an open drain in the system.
3) Check the cleaning circuit to ensure that the HydroSkrub solution is flowing from the
circulation bucket, through the pump and the heater and back to the top of the top of the
bucket.
4) Return discharge foaming indicates an active HydroSkrub solution and the presence of
mineral deposits in the equipment.
5) Additional HydroSkrub and/or water may be required to maintain circulation and to prevent
the pump from cavitating.
6) Circulate through the Heat Exchanger and piping for 1 to 3 hours. Estimate the circulation
period based on the time in service and water hardness. If the heating equipment is more
than 40 gallons, the circulation time may need to be extended to complete cleaning. When
foaming action stops, HydroSkrub strength is depleted (two pounds of deposits removed per
gallon used) or the equipment is free from calcium and other water-formed mineral deposits.