Service manual

MSE Series Electric Boilers – Installation and Service Manual

1.2 WATER TEMPERATURE RISE vs FLOW RATE

NOTE: The boiler should be properly sized for its heating application and maintain an adequate water

flow rate during operation. Significantly oversizing the boiler or decreasing boiler water flow

rate will cause excessive stage cycling and result in premature failure of the contactors.

Water flow rate vs temperature rise formulas in US gallons per minute (GPM) and liters per minute (LPM):

6.94 x kW 14.6 x kW

GPM =

Temp. Rise (°F)

LPM =

Temp. Rise (°C)

Table 2: Water Temperature Rise vs Flow Rate in GPM (LPM)

Model KW

10°

°°

°F (5.6°

°°

°C) 20°

°°

°F (11°

°°

°C) 30°

°°

°F (17°

°°

°C) 40°

°°

°F (22°

°°

°C)

6MSE 6 4.2 (16) 2.1 (8) 1.4 (5) 1.0 (4)

9MSE 9 6.2 (23) 3.1 (12) 2.1 (8) 1.6 (6)

12MSE 12 8.3 (31) 4.2 (16) 2.8 (10) 2.1 (8)

15MSE 15 10.4 (39) 5.2 (20) 3.5 (13) 2.6 (10)

18MSE 18 12.5 (47) 6.2 (24) 4.2 (15) 3.1 (12)

20MSE 20 13.9 (52) 6.9 (27) 4.6 (17) 3.5 (13)

24MSE 24 16.6 (63) 8.3 (32) 5.5 (21) 4.2 (16)

27MSE 27 18.7 (70) 9.4 (36) 6.2 (23) 4.7 (18)

30MSE 30 20.8 (78) 10.4 (40) 6.9 (26) 5.2 (20)

34MSE 34 23.6 (89) 11.8 (45) 7.9 (29) 5.9 (23)

38MSE 38 26.4 (99) 13.2 (50) 8.8 (33) 6.6 (25)

42MSE 42 29.1 (109) 14.6 (56) 9.7 (36) 7.3 (28)

45MSE 45 31.2 (117) 15.6 (60) 10.4 (39) 7.8 (30)

48MSE 48 33.3 (125) 16.6 (64) 11.1 (41) 8.3 (32)

54MSE 54 37.5 (141) 18.7 (72) 12.5 (46) 9.4 (36)

1.3 GENERAL DIMENSIONS

Figure 1 – General Dimensions