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PHTM II
Combi Installation, Operating & Service Instructions
16
Operation
(continued)
Table 16-13: Menu
5P
5P
,, Setpoint Menu (visible only after password entered)
Default
Range/
Choices
Parameter and Description
0
0, 1
501
501
Temperature Units
Sets display temperature in degrees Fahrenheit or Celsius.
(0) Fahrenheit
(1) Celsius
60
0 to 120
(minutes)
502
502
DHW Priority Time
When DHW Priority Time is greater than zero and DHW heat demand is present, DHW demand
has priority over heating demands for this specified time. After DHW demand ends or DHW Priority
Time is exceeded and CH demand is present, CH demand has priority over DHW demand.
130°F
54°C
50°F to 180°F
(10°C to 83°C)
503
503
Central Heat 1 Min Boiler Water Temp
Sets a low limit for Reset setpoint. Set this parameter to lowest supply water temperature that
will provide enough heat for type of radiation used to function properly. Always consider type of
radiation when adjusting this parameter.
130°F
54°C
50°F to 180°F
(10°C to 83°C)
504
504
Central Heat 2 Min Boiler Water Temp
Sets a low limit for Reset setpoint. Set this parameter to lowest supply water temperature that will
provide enough heat for type radiation used to function properly. Always consider type of radiation
when adjusting this parameter.
2
0, 1, 2
505
505
Auxiliary Thermostat Input Select:
May be used as "Recirculation Enable", "Indirect Water Heater (IWH) DHW demand" (heating
boilers only) or "CH Zone 2 Heat demand" input.
(0) Recirculation Enable
Recirculation enable input. When Recirc (Comfort) Mode is
enabled, "Aux Pump" output is energized to run a recirculation
pump when this input is "On". This input may be (a) jumpered
allowing recirculation pump to run at all times, (b) wired to a time
of day clock, or (c) wired to a momentary push button. Note:
recirculation pump continues to run for 15 minutes after this input
is removed.
(1) DHW Demand
Indirect Water Heater (IHW) DHW heat demand. (not for combi
boilers)
(2) CH Zone 2 Thermostat
Central Heat 2 heat demand.
Central Heat
Setpoint
Heating Element Type
Central Heat
Setpoint
Heating Element Type
180°F to 190°F
(82.2°C to 87.8°C)
Fan Coil
100°F to 140°F
(37.8°C to 60°C)
In Slab Radiant
High Mass Radiant
160°F to 190°F
(71.1°C to 87.8°C)
Convection
Baseboard
Fin Tube
Convective
130°F to 160°F
(54.4°C to 71.1°C)
Staple-up Radiant
Low Mass Radiant
130°F to 160°F
(54.4°C to 71.1°C)
Radiant
Baseboard
140°F to 160°F
(60°C to 71.1°C)
Radiators
Table 16-14: Radiation Setpoints
