Steffes 5140 Owner & Installers Manual - Manual (Page 7)

Comfort Plus Hydronic Operation  1.03 Operation  1.02 Comfort Plus Hydronic
rooM teMPerature control
Room temperature is adjusted at the wall thermostat(s). A heat call from the room thermostat energizes the primary
water loop pump. The variable speed core blower automatically adjusts its speed to achieve the desired outlet wa-
ter temperature. The heated water is then pumped to the area (zone) from which the heat call originated.
In heat pump applications, a heat call from the room thermostat first utilizes the heat pump’s heating capacity to
satisfy comfort requirements. As the outdoor temperature declines and the heat pump’s heating capacity begins to
diminish, the Comfort Plus Hydronic modulates heat to help maintain a comfortable air temperature in the duct.
Brick core cHarGe control
The amount of heat stored in the brick core of the Comfort Plus Hydronic system is regulated automatically in rela-
tion to outdoor temperature and the heating requirements. The outdoor sensor, supplied with the system, monitors
outdoor temperature. As the outdoor temperature decreases, heating requirements increase, and the Comfort Plus
Hydronic system stores more heat accordingly.
cHarGe control overriDe
The Comfort Plus is equipped with a charge control override feature that allows the user to force the system to
target a full core charge level. This override can be initiated or cancelled at any time. If an override is initiated,
the system targets a full core charge level during the next off-peak period. It continues to charge during off-peak
hours until the system achieves full (maximum) core charge or until the override is cancelled. Once full charge is
achieved or the override is cancelled, the system charges according to its standard configuration.
Initiating the Override Feature
Step 1 Press and hold the M, the up arrow, and the down arrow buttons at the same time.
Step 2 The faceplate will flash “FULL” and “ON”. Continue to hold the three buttons until “ON” displays con-
tinuously on the faceplate.
Step 3 Release the buttons. The override is now enabled. The faceplate will return to displaying its standard
operating mode.
Manual Cancellation of the Override Feature
Step 1 Press and hold the M, the up arrow, and the down arrow buttons at the same time.
Step 2 The faceplate will flash “FULL” and “OFF”. Continue to hold the three buttons until “OFF” displays
continuously on the faceplate.
Step 3 Release the buttons. The override is now cancelled. The faceplate will return to displaying its standard
operating mode.
Maintenance anD cleaninG
General cleaning of the system's cabinet should be conducted at the user's discretion. It is important to monitor
water levels/pressure (PSI) as low water levels cause poor performance and possible damage to the system. Ask the
installer of the equipment for information on how to measure these levels.
When using the Steffes Air Handler with the Comfort Plus Hydronic System, periodically check and replace the air
filter.
If a heat pump or air conditioner is interfaced with the Comfort Plus Hydronic, the indoor coil of these devices
should be cleaned periodically, to maintain system efficiency. Follow the manufacturer's cleaning recommendation
for these devices. Regular replacement of the air filter and cleaning of coils will provide better airlow and optimum
system efficiency.