Boiler Loop Design Guidelines; Flow Rate & Pressure Drops: Models Ext 450 2S, 600 2S, 800 2S & 1100 2S - Watts AERCO Modulex EXT Series Technical Application Manual

Modulex EXT Series Piping

BOILER LOOP DESIGN GUIDELINES

SECTION 3: BOILER LOOP DESIGN GUIDELINES
For proper and safe operation of the water tube Modulex boiler, the primary (boiler) loop piping and the
associated fittings and accessories must be designed/selected as discussed in the following sections.
Table 1 shows the required minimum flow rates at various system designed temperature rises. Also
shown are pressure drops through strainers typically needed in the boiler loop (see paragraph 4.2 for
strainer requirement details).
The following primary/secondary piping design guidelines should be used for AERCO Modulex Boiler
installations. The data was calculated based upon systems with Return Water Temperatures above 80F.
A 20 mesh strainer (or finer) is required at each boiler inlet. Water flow rates and pressure drops shown
below are for the boiler loop. Boiler water flow rates vary with system design parameters. The boiler
loop fittings and strainer pressure drops shown below are examples only – actual pressure drops
will vary depending on actual piping layout and strainer size/type used.
3.1. Flow Rate & Pressure Drops: Models EXT 450 2S, 600 2S, 800 2S & 1100 2S
TABLE 1.1: Light Commercial: 50 F
50°F ΔT Water Flow
Water Flow (GPM) @ Max. ∆T of 50F
Water Pressure Drop (Ft. of Hd.) across Boiler @ 50F
∆T Flow
Strainer ∆P (Ft. of Hd.) – ('Y' Strainer, 20 mesh)
∆P (Ft. of Hd.) – (20' SCH.40, 4 x 90°, 2 x reducing
couplings, 2 x Ball Valve)
Total Primary Loop ∆P (Ft. of Hd.) @ ∆T of 50F
Strainer, Pipes, Valves and Fittings Sizes used to
estimate ∆P for above piping configurations
Recommended AERCO Pump + Circuit Setter Kit for
piping configurations not exceeding the above example
Kit includes: Pump Flange Size
Kit includes: Circuit Setter Size (NPT)
Page 10 of 37
10.07.2010
Application Guide
∆
T Water Flow
EXT 450 2S
18
2.1
0.50
0.81
3.44
1-1/2"
99127-1
1-1/2"
1-1/2"
AERCO International, Inc. • 100 Oritani Dr.
Phone: 800-526-0288
EXT 600 2S EXT 800 2S
24 30
1.7 1.6
0.89 0.41
1.47 0.65
4.09 2.67
1-1/2" 2"
99127-1 99127-2
1-1/2" 1-1/2"
2"
1-1/2"
Blauvelt, NY 10913
EXT 1100 2S
41
1.8
0.80
1.23
3.82
2"
99127-3
2"
2"
TAG-0099