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Overview
The DHW (Domestic Hot Water) Energy Saver connects to a Heat-Timer RINet Platinum series control (all MPC,
MPCQ, HWR, HWRQ, SRC RINet Platinum controls with software version 7.05 or higher) to operate a boiler or direct/
indirect water heater and a DHW circulating pump based on two set points. One set point is for the boiler and the other
is for the pump. Two sensors connected to the Platinum RINet (Internet communication capable control) are used.
Aux Temp 0 sensor measures the domestic hot boiler supply temperature. Aux Temp 1 sensor measures the domestic
recirculating line return temperature.
All the DHW Energy Saver settings can be viewed and adjusted through the Platinum control menus or the Platinum
control pages on ICMS website (http://www.htcontrols.com). Each of the supply and return temperatures have a set point
and a peak demand and light load condition differentials. This offers better operation and savings than one differential.
As the goal is to reduce boiler/water heater and pump operation during light periods. That can be achieved by having
slightly longer boiler/water heater run periods and longer off periods using a larger differential. When the supply
temperature drops below the Supply Set Point and differential, the Control will energize the boiler output. The boiler
output will remain energized until the supply temperature reaches the Supply Set Point. When the return temperature
drops below the Return Set Point less the differential, the Control will energize the circulating pump output. The pump
output will remain energized until the return temperature reaches the Return Set Point.
• Make sure Recirculating Pump control does not adversely affect other equipment. I.e. tempering valve.
• Make sure the boiler/water heater can operate properly at the lowest desired differential adjustment.
The Platinum control has a separate DHW Energy Saver weekly Day/Night schedule that can be set using the Internet
ICMS web site or through the Platinum control menu. It offers 4 peak and 4 light load periods for each day of the week.
When in the peak period, the Platinum control will use the Peak Differential setting. When in the light usage period, the
Platinum control will use the Light Differential setting. The Light Differential must be greater than the Peak Differential
to provide longer boiler or pump runtime and longer off periods.
Typical Wiring for Platinum
Serial Panel RS485 Plug
16VAC
~
~
1
2
16 VAC
Communication to
(transformer
Provided)
Platinum Control
DHW Energy Saver Installation and Configuration Manual
DHW Energy Saver
COM
A GND B
3
4
5
Heat-Timer
WARNING
Boiler
Pump
6
7
8
9
DHW boiler and
DHW circulating
pump output relays
3
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