Patterson-Kelley MACH Series, Инструкция по установке и эксплуатации

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MACH® Series Gas-Fired Boiler Installation
Page 21
Step Value
1 Outlet water temp
2 Inlet water temp
3 Domestic Hot Water temp *
4 Outdoor air temp *
5 Flue gas temp
6 Boiler outlet setpoint
7 Rate of change outlet temp °F/second
8 Rate of change inlet temp °F/second
9
Rate of change Domestic Hot Water
°F/second
A
Second Comfort Heat system
temperature
* If the sensors for these functions are not installed,
the display will indicate
-22
.
3.12.1.2 Operating Configurations
The boiler has several different operating
configurations. These are:
•
Internal Setpoint
•
Domestic Priority
•
Outdoor Air Reset
•
Analog Input Setpoint
•
Analog Input Direct Drive
CAUTION!
Do not modify any parameters other than those
specifically mentioned.
Internal Setpoint:
The internal setpoint is set with parameter 4. The
boiler temperature control modulates the boiler to
maintain this internal setpoint. The upper and lower
temperature differentials are used to instruct the boiler
at what temperature to turn on and at what temperature
to turn off.
Item Parameter Value Allowable
Range
Setpoint 4 160 68-185
Low Temp. Differential 22 10 0-36
High Temp. Differential 23 9 0-36
Low Temp. Setpoint 5 68 59-140
The boiler will modulate to try to maintain 160° F. If
the temperature increases above 169° F which is the
setpoint 160° F + High Temp Differential 9°F the
boiler will shut off. Once it shuts off it will not
restart until the temperature drops below 150° F
which is the setpoint – Low Temp Differential. The
Low Temp Set Point will not permit the operator to
adjust the setpoint below 68° F. (See graph below.)
Internal Setpoint
145
150
155
160
165
170
175
0 10 20 30 40
Time
Boiler Temperature
Boiler Set Point
Boiler Turns On
Boiler Turns Off
Domestic Priority:
If an indirect domestic hot water (DHW) tank is
connected, the DHW function of the boiler will
activate when the DHW temperature controller
(supplied by others) closes (Terminal 5 to 8 TB 1,
refer to Section 6.1.1), indicating a call for heat from
the DHW system. The parameters should be set as
follows:
Item Parameter Value
DHW Setpoint 1 140
DHW Setpoint Addition 33 30
DHW Status 2 1
DHW High Temp. Differential 25 6
DHW Low Temp. Differential 24 6
DHW Options 35 13
In the above example, the boiler temperature will be
set to the DHW Se the DHW Setpoint
Addition (140ºF + 30ºF = 170ºF) when the DHW