![background image](http://html1.mh-extra.com/html/watts/aerco-58025-05/aerco-58025-05_technical-instructions_3805810005.webp)
VD2: 10/14/14
Page 5 of 24
BMK1.5 LN Boiler 24-Month Maintenance Kit #58025-05 Instructions
Technical Instruction Document
TID-0066_0B
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
•
Phone: 800-526-0288
Figure 1: Benchmark 1.5 Low NOx (LN) Boiler
5.
WATERSIDE INSPECTION OF THE HEAT EXCHANGER
Benchmark 1.5LN Models contain a single heat exchanger, as shown in Figure 2. Perform the
waterside inspection as follows:
Burner Preliminary Disassembly and Inspection Instructions
1. Ensure that the preliminary safety, set-up, and disassembly procedures in section 4 have
been performed to provide access to the heat exchanger of the unit.
2. Allow the unit to cool prior to proceeding.
3. At the rear of the unit (Figure 3), slowly open the drain valve and drain the boiler water
from the heat exchanger.
4. Open the P&T relief valve (Figure 2) to allow air to enter the heat exchanger during
draining.
5. After the heat exchanger has been drained, remove the 2-1/2 inch access port plug on the
right side of the heat exchanger, as shown in Figure 2.
6. If waterside inspection is required by your local inspector, follow the inspector's
instructions. Upon satisfactory completion of the inspection, proceed to step 7.
7. Apply pipe compound to the threads of the access port plugs and replace them using a
pipe wrench.
8. Close the drain valve at the rear of the boiler.
9. Close the P&T relief valve.
10. Open the water supply and return valves to the unit and refill the heat exchanger. This
completes the waterside inspection for the unit.
2 SIDE PANELS
(EACH SIDE)
TOP PANEL