Install Instructions

107750-01 - 9/17

IX. System Piping (continued)

Boiler

Model

Min. Pipe

Size (in.)

∆T = 35°F ∆T = 30°F ∆T = 25°F ∆T = 20°F

Min.

Flow

(GPM)

Boiler

Head Loss

(ft)

Flow

(GPM)

Boiler

Head Loss

(ft)

Flow

(GPM)

Boiler

Head Loss

(ft)

Max.

Flow

(GPM)

Boiler

Head Loss

(ft)

ASPN-320 1 1/2 17.0 0.5 19.8 0.6 23.8 1.0 29.8 1.6

ASPN-399 1 1/2 21.2 0.8 24.7 1.1 29.7 1.6 37.1 2.5

C. Near Boiler Piping Design

Proper operation of this boiler requires that the water ow rate through it remain within the limits shown in Table 9.3 any

time the boiler is ring. At ow rates below the minimum shown, the boiler’s temperature rise limit function may prevent the

boiler from ring. Flow rates through the boiler in excess of the maximum shown in Table 9.3 can result in excessive noise or

erosion damage to piping.

There are two basic methods that can be used to pipe this boiler into the system. Method #1 (primary-secondary piping)

is always preferred. Additional information on hydronic system design can be found in the I=B=R Guide RHH published by

the Air-Conditioning, Heating and Refrigeration Institute (AHRI).

Figure 9.2: LWCO Location

Table 9.3: Flow Limitations