Hamilton Engineering EVO Plus Series - Page 48

48
PART 8. MAINTENANCE
B. ANNUAL INSPECTION (continued)
TESTING
The following steps require the power supply be turned back on; extreme caution must be exercised
when performing service with the power supply on and the door o.
• When turning the appliance back on, listen for significant noises from the fan and pump. Also, inspect for leaks at
the pump connections.
• Enter the status menu from the home screen to access the sensor readings, and record each reading, making sure
that all sensors and thermometers are reading the same, with the heat o.
• Fire the appliance on maximum output for 5 minutes, in order to check the ∆T from the inlet sensor to the outlet
sensor.
- If the ∆T reading is out of design range by more than 10% or there is an A1 or A2 error on the display, refer to coil
cleaning instructions below. Record ∆T to track any increases from one year to the next.
• Fire the appliance on maximum output, and measure and adjust the CO
2
percentage as required.
• Fire the appliance on minimum output, and measure and adjust the CO
2
percentage as required.
• If there are an unusual number of G01 faults or if combustion is o significantly, gas supply pressure must be
verified at static (no load) and full building load conditions.
• See Table 3-3, Page 15 for specific settings.
• Inspect intake and exhaust screens at the termination point for signs of contamination (i.e. leaves, twigs, etc).
• A dierential pressure (∆P) reading should be taken across the exhaust and inlet air connection points of each
appliance to confirm that it is below the maximum shown below.
NOTE: The inlet air pressure should be negative.
Model Air Pressure (∆P)
HW299 < .7" wc
HW399 < 1" wc
HW599 < .86" wc
Hamilton EVO Products
Flow and Pressure Drop Heat Exchanger only - (GPM and Feet of Head @ 68°F)
Effective 11/2009 LIT 91149
Model
BTU/hr.
Input
Minimum
Flow Rate
must be
clean water
system*
∆P at
Minimum
Flow Rate
- ft. of
head
Hydronic*
Pipe Size
GPM Head
DHW
Pipe
Size
GPM Head
HWH 299.2 300,000 8.5 5.1 1.5" 51.8 28.8 11 9.3
HWD 299.2 300,000 1.5" 35.3 19.6 16.5 21.1
HWH 399.2 399,999 11.31 3.9 1.5" 43.2 24.0 17.6 9.4
HWD 399.2 399,999 2" 29.4 16.3 26.4 19.2
HWH 599.2 630,000 17.8 5.1 1.5" 45.3 25.2 26.4 9.4
HWD 599.2 630,000 2" 30.9 17.1 39.6 21.5
* Must be closed loop system with clean, treated water.
Design ∆T
DHW @ 97%
efficiency
°F °C
Design ∆T
Hydronic*
@ 95%
efficiency
°F °C
Hydronic Applications DHW Applications