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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 2 – INSTALLATION
2.8 CONDENSATE DRAIN and PIPING
The Benchmark Boiler is designed to condense water vapor from the flue products. Therefore,
the installation must have provisions for suitable condensate drainage or collection. See the
following subsections for information on the condensate drain and piping for the various models.
The condensate drain port located on the exhaust manifold (see Figure 2-4a and 2-4b) must be
connected to the condensate trap (P/N 24441), which is packed separately within the unit's
shipping container. The condensate trap inlet and outlet connections contain tapped 3/4" NPT
ports.
A sample condensate trap installation is shown in Figure 2-6a and 2-6b. However, the actual
installation details for the trap will vary depending on the available clearances, housekeeping
pad height/dimensions and other prevailing conditions at the site. The following general
guidelines must be observed to ensure proper condensate drainage:
•
The condensate trap inlet must be level with, or lower than the exhaust manifold drain
port.
•
The base of the condensate trap must be supported to ensure that it is level (horizontal).
•
The trap must be removable for routine maintenance. AERCO recommends that a union
be utilized between the exhaust manifold condensate drain port and the trap inlet port.
While observing the above guidelines, install the condensate trap as follows:
Condensate Drain Installation Instructions
1. Connect the condensate trap inlet to the exhaust manifold drain connection using the
appropriate piping components (nipples, reducers, elbows, etc.).
2. At the condensate trap outlet, install a 3/4" NPT nipple.
3. Connect a length of 1" (2.54 cm) I.D. polypropylene hose to the trap outlet and secure with a
hose clamp.
4.
Route the hose on the trap outlet to a nearby floor drain.
If a floor drain is not available, a condensate pump can be used to remove the condensate to an
appropriate drain. The maximum condensate flow rate is:
Model
Maximum Condensate Flow Per Boiler
BMK 750
6 gallons
BMK 1000
8 gallons
BMK 1500
9 gallons
BMK 2000
10 gallons (38 L) per hour
BMK 2500
17 gallons (64 L) per hour
BMK 3000
20 gallons (76 L) per hour
WARNING!
Use PVC, stainless steel, aluminum or polypropylene for condensate drain piping. Do NOT
use carbon or copper components.
OMM-0121_D • GF-205 • 5/9/2019
(23 L) per hour
(30 L) per hour
(34 L) per hour
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 24 of 122
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