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1
Service
Pumps
System Pump Mode
The SMART TOUCH control is able to control the system
pump in 5 different ways. The options are as follows:
1.
ON with a call for heat, with a constant speed.
2.
ON with a call for heat, with a variable speed input.
3.
Always ON, with a constant speed, except during
outdoor shutdown.
4.
Always ON, with a variable speed input, except
during outdoor shutdown.
5.
Always OFF (not connected).
For options 2 and 4, the speed of the system pump is
controlled by a separate control system. The pump speed is
sent to the 0-10V pump speed input on the boiler.
Boiler Pump Delay
The SH pump delay parameter sets the length of time the
boiler pump will run after a SH demand has been satisfied.
Boiler Pump Anti-Seize Time
If the boiler pump does not run for 24 hours, it will be turned
on briefly to prevent it from seizing. The length of time it
runs is determined by the Boiler Pump Anti-Seize Time
parameter.
Boiler Pump Mode
The SMART TOUCH control is able to control the boiler
pump in 3 different ways. The options are as follows:
1.
ON with a call for heat, with a constant speed.
2.
ON with a call for heat, with a variable speed
output.
3.
Always OFF (not connected).
System Pump Delay
The system pump delay parameter sets the length of time the
system pump (if connected) will run after a SH demand has
been satisfied.
System Pump Anti-Seize Time
If the boiler pump does not run for 24 hours, it will be turned
on briefly to prevent it from seizing.
ΔT Set Point
The SMART TOUCH control includes a 0 - 10Vdc output
for controlling the speed of a variable speed boiler pump.
This feature can be used with primary - secondary piping
systems only. The speed is regulated in order to, among
other things, maintain a minimum delta T across the heat
exchanger. This helps reduce the electrical consumption
of the boiler pump when the boiler is firing at less than its
maximum rate. (This feature is active only when a system
supply sensor is installed).
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DHW System Pump Mode
This parameter allows the installer to determine how the
system pump responds to a DHW call for heat. The parameter
can be adjusted through the DHW System Pump Mode
parameter. Select Always Off if you want the system pump to
always turn off during a DHW call for heat. Select Always On
if you want the system pump to always turn on during a DHW
call for heat. Select Normal if you want the system pump to
ignore the DHW call for heat and operate based on the System
Pump Mode setting only.
DHW Pump Delay
The DHW pump delay parameter sets the length of time the
DHW pump (if connected) will run after a DHW demand has
been satisfied. This parameter is adjustable by the installer by
accessing the DHW Pump Delay parameter.
DHW Pump Anti-Seize Time
If the boiler pump does not run for 24 hours, it will be turned
on briefly to prevent it from seizing. The length of time it runs
is determined by the DHW Pump Anti-Seize Time.
DHW Type
This parameter gives the installer a choice of piping directly
to the boiler for use as a hot water generator for domestic
hot water (DHW), or as a zone in the heating system. This
parameter can be adjusted through the DHW Type parameter.
For direct DHW select Normal, for treating the DHW as a
zone, select Zone.
DHW/SH Switching Time
When a boiler has a DHW demand and it receives a space
heating demand, the SMART TOUCH control will start a
timer. Once the timer expires, it will stop the DHW demand
and service the space heating demand. This feature does not
apply when the DHW is programmed as a zone, or in Cascade.
The installer can adjust the length of time the boiler will service
the DHW demand by accessing the DHW/SH Switching Time
parameter.
SH/DHW Switching Time
When a boiler has a space heating demand and it receives
a DHW demand, it will immediately switch to the DHW
demand and start a timer. Once the timer has expired, the
boiler will switch back to the space heating demand and start
another timer. Once this timer expires, it will switch back
to the DHW demand. This feature does not apply when the
DHW is programmed as a zone, or in Cascade. The installer
can adjust the length of time the boiler will service the space
heating demand by accessing the SH/DHW Switching Time
parameter.
DHW Rate Limiting
This parameter determines the maximum rate to be used when
heating a DHW tank. This setting may be used when the tank
is unable to accept all of the BTU's available from the boiler.
This parameter may be adjusted by the installer by accessing
the DHW Rate Limiting parameter.
Service Manual
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