heat-timer DiGi-SPAN Elite Series Owner's manual

The RSM-Elite is designed to control under slab heating
systems to prevent accumulations of ice or snow. To do
this, it monitors three temperatures, the outside temperature,
the temperature of the uid going to the slab, and the
temperature of the uid returning from the slab.
The slab must be kept above freezing (32°F) whenever there
could be frozen precipitation. Consequently, any ice or snow
which falls on the slab will melt immediately. If precipitation is
allowed to accumulate before the slab is heated, an effect called
bridging can occur. The snow or ice directly in contact with
the slab will melt. But, the snow above will act as an insulator,
reecting the heat back into the slab. The slab itself will have
no ice touching its surface, but the remaining accumulation
will melt very slowly. To prevent this, the RSM-Elite activates
the slab heating system whenever the outside temperature
falls below the adjustable outdoor cutoff temperature.
Once the slab heating system is activated, the amount of energy
entering the slab is determined by the difference between the
temperature of the uid going to the slab (the Slab Supply)
and the temperature of the uid returning from the slab (the
Slab Return). The difference between these two is called the
Slab ΔT or Delta T. The Slab ΔT will be different for each
slab composition based on the slab design. The higher the
Slab ΔT, the more energy is being input to the slab. If the
Slab ΔT is set larger than its design ΔT, the slab itself may
be damaged. The RSM-Elite provides a maximum Slab ΔT
adjustment which can be set from 5°F to 50°F. This setting
protects the slab during the initial warm-up periods.
After the warm-up period, each slab has a heat loss that varies
with the outdoor temperature changes. Thus, a slab might
require 130°F uid temperature at 0°F outdoor temperature
to maintain its heat. However, when the outdoor warms to
15°F, it might require only 100°F uid temperature circulating.
The RSM-Elite is provided with a Curve adjustment
to insure the slab temperature will be sufcient to melt
frozen precipitation once the warm-up period has ended.
INSTALLATION AND OPERATION INSTRUCTIONS
RSM DIGI-ElItE
Residential Snow Melt Control
®
Under Slab Snow-Melting Hydronic Heating System
WARNING
This Heat-Timer control is strictly an operating control;
it should never be used as a primary limit or safety
control. All equipment must have its own certified
limit and safety controls required by local codes. The
installer must verify proper operation and correct any
safety problems prior to the installation of this Heat-
Timer control.
Blue
(Valve Close)
Yellow
(System Pump)
Red
(Valve Common)
White
(Valve Open)
Boiler SYS
Pump
DHW
Pump
SET
®
C O R P O R A T I O N
R
SYSTEM = 147oF
RETURN = 125oF
Close Open System
2 Line Alphanumeric Display
Displays sensor values and
menu settings
Output Lights indicate
output status
Display Section Locking Screws
Black (120VAC power)

2
The Curve value compensates for both different slab types and different outdoor weather conditions. After making a change in
the Curve value, it is necessary to wait at least several hours before accessing what affect it will have on slab temperatures.
The RSM-Elite will control a 3-way motorized mixing valve to regulate the amount of heat being supplied to the slab. The motorized valve
will mix the heated uid from the heat source with the uid returning from the slab.
Mounting the Controller
• The RSM-Elite is designed to mount on a 1900
(4”x4”) deep electrical box.
• If additional room is needed for wiring use the
extension skirt provided in the box.
• Place the RSM-Elite in a convenient location near
the unit to be controlled.
• Mount the RSM-Elite indoors and away from
excessive heat or cold.
• Partially unscrew the Display Cover Mounting
screws. This allows for its removal.
• Lifting the Display Section away from the base will
unplug it from the Base section.
• Proceed with the power and output wiring
instructions.
• Use the screws provided to mount the RSM-Elite
to the 1900 box or the extension skirt.
• Mount Display Section back to the Base Section.
Tighten the Display Cover Mounting Screws.
Wiring
Wiring Power Input
The RSM-Elite is designed to accept ONLY A SINGLE POWER SOURCE. It can be wired to either 120VAC using the two Black
wires or 24VAC using the right most two terminals on the terminal block on bottom of the control. Heat-Timer recommends the
installation of a Surge Suppressor and a Power Switch before the Power Line connection for safety and ease of service.
120VAC
• Attach line voltage, 120VAC, to the two Black wires extending from the back of the RSM. Remember to use the power line from a
different source than the equipment being controlled.
24VAC
• Use a dedicated transformer with at least a 5VA output.
• Bring 24VAC to the two right most terminals on the front of the RSM-Elite marked 24VAC and COM.
Wire Colors and Output Lights
• The RSM-Elite has a three S.P.S.T. (single-pole single-throw N.O.) relays. Each output is rated at 1 Amp inductive load or 6A
resistive load at 120VAC.
• The RSM-Elite has three lights that follow the output relays operation. When a relay energizes, its LED will turn on.
• The outputs are dry contacts only. They do not source any power.
• The two Yellow wires represent System Output relay and the right LED. The System output can control the Slab supply pump. See
System Pump Wiring on page 3.
• The Blue wire represents the Valve Close Output relay and the left LED.
• The White wire represents the Valve Open Output relay and the middle LED.
• The Red wire represents Valve Common. This wire must be connected to the valve power source. See Motorized Valve Wiring on
page 3.
WARNING
The RSM-Elite can accept only one source of power: 120VAC or 24VAC.
If more than one power source is applied, the unit may be damaged.
T1 T2 T3+ COM COM T3- EXT+ EXT- P+ P- COM 24VAC
Display Cover Mounting Screws
Display SectionBase Section
Base Mounting Holes
Input Terminals 24VAC optional power input

3RSM Digi-Elite Operation Manual
System Pump Wiring
• Wire the two Yellow wires to the Slab Pump circuit. The relay should be wired to
break the power source hot leg. The relay is rated at a maximum of 1 Amp pilot duty
(Maximum of 1/8 HP) or 6 amp resistive load at 120VAC.
• The RSM-Elite System output does not source any power. A separate pump power
source is required. The relay makes when energized to switch the power to the pump.
Motorized Valve Wiring
• The valve motor must be of the oating type.
• The Red to Blue (Close relay) and Red to White (Open relay) connections are dry
contacts only. They do not source any power.
• The two valve relays are N.O. and each is rated at 1 Amp inductive load or 6A
resistive load at 120VAC.
• Connect the Red wire to the power source. The second wire from the power source to the valve
common terminal.
• Connect the Blue wire to the valve motor Close terminal.
• Connect the White wire to the valve motor Open terminal.
Wiring Input Terminals
Slab Supply and Return Immersion Sensor Installation
Supply (T1, COM), Return (T3+, T3-)
• Place the Slab Supply sensor in the header approximately 10' past the mixing valve before any
takeoffs where it will register the mixing valve output temperature.
• Place the Slab Return sensor where it will register the slab return temperature before mixing with
other returns.
• Only use the Standard Brass Tube sensors included with the control (HT# 904250-00).
• Each of the sensors must be inserted into a 3/8”ID 1/2”NPT immersion well (HT #904011-00).
• The sensor wires can be extended up to 500' using a shielded 2-conductor cable (Belden #8760 or
equivalent (#18/2)). Do not connect the shield at the sensor end. But, connect it to the
control COM and T3- terminals. Do not run sensor wires in conduit with line voltage
wiring.
Outdoor Sensor Installation
(T2, COM)
• Only use the Heat-Timer sensor included with the unit (HT# 904220-00).
• Locate the sensor in the shade on the north side of the building. It should never be in
direct sunlight.
• Be sure the location is away from doors, windows, exhaust fans, vents, or other
possible heat sources.
• The sensor should be mounted approximately 10' feet above ground level.
• Adhere the Outdoor Label provided to the back of the sensor base.
• Use the Enclosure Base bottom knockout for the conduit. Use the locknut to hold the
conduit and enclosure base together. Screw the cover to the base.
• If screws are used to afx the enclosure to the wall, make sure to seal around the sensor
and wall except from the bottom.
• The sensor wires can be extended up to 500' using shielded 2-conductor cable (#18/2).
Do not connect the shield at the sensor but at the control using the COM terminal.
• Do not run sensor wires in conduit with line voltage wiring.
ALERT
Determining the proper location for the Outdoor Sensor is very important.
The RSM-Elite will base its operation on the outdoor temperature information
it receives from this location. If the sensor is in the sun, or covered with ice,
its reading will be different from the actual Outdoor temperature.
DHW
Pump
SET
C O R P O R A T I O N
R
147
oF
125
oF
120 VAC
System Pump
Motorized
Valve (Floating)
Power (Black)
(Yellow)
Common (Red)
Close (Blue)
Open (White)
Close
Open
Comm
24VAC
Transformer
120VAC
120 VAC
SYSTEM
N
L
N
T1 T2
COM COM
T3+
T3-
EXT+
EXT-
P+
P-
COM
24VAC
Enable/Disable Dry Contact
Outdoor Sensor
Slab Supply Sensor
Slab Return Sensor
RSM-Elite Input Terminals
24VAc Power (Optional)
Not Used
Outdoor
Sensor
snap-in
location
Shield
not connected
Conduit
Outdoor Label
on back of Sensor
Outdoor Sensor
Mounting
screws
location
Seal around
sensor and wall
Outdoor
drip-hole
Immersion Well
3/8" ID 1/2" NPT
Heating System
Sensor
Common Supply Pipe
Sensor Probe
Immersion Slab Sensor
Shield

4
Wiring the Enable/Disable
(EXT+, EXT-)
• The EXT± terminals can be used to enable or disable the system by connecting it to a
switch. It accepts dry contact input only. See Enable/Disable Input on page 8.
• If no thermostat or switch is connected to the EXT± terminals, leave the jumper supplied as a contact to the terminals.
• The RSM-Elite will not operate the outputs unless the EXT± terminals are shorted.
Button and Navigating Menus
The RSM-Elite has three buttons.
• The SET button function varies. When the Default Screen is displayed,
pressing the SET Button views the MENU. When in the menus and settings,
the SET Button accepts the selected entry or setting value.
• When in the menus, pressing the Up and Down buttons will scroll through the menu options. They can be used to change the
setting of a specic function. i.e., change the Set Point, Differential, or System Trim. In addition, when in the default screen, the
Up and Down buttons will display the outdoor temperature and Outdoor Cutoff when no return sensor is available, or the outdoor
temperature and the return temperature when an active return sensor is connected.
• At the end of every operation menu there is a <Back> option that allows the user to go back one menu level. If the SET Button
was held down for three seconds on the <Back> option, the display will go back to the default screen.
SET
SET
SET
SET
SET
HEAT-TIMER CORP.
V1.00 c 2008
DIGI-SPAN ELITE
RSM
Loading Default
Values...
DISPLAY UNIT:
F
C
SETUP COMPLETE!
PRESS SET
Startup Menu
SYSTEM= 168 F
RETURN= 125 F
------MAIN------
<Set Point>
<Settings>
<Maintenance>
<Sys. Startup>
<Info>
<Back>
--- -SETTINGS ---
Gain 0
Run-On 2m
<Back>
System Trim:
+0 F
SYSTEM STARTUP
No
Yes
RSM-Elite V1.00
F
Operating Menu
Default Screen
Menus
SET
SET
SET
SET
SET POINT
Curve 0
Slab DT 20 F
Cutoff 38F
Max Temp. 140F
<Back>
Cutoff:
38 F
- MAINTENANCE -
Sys. Trim +0 F
Out. Trim +0 F
Ret. Trim +0 F
Valve
<Back>
Outdoor Trim:
+0 F
System Run-On:
2m
Return Trim:
+0 F
Valve Mode:
Auto
Close
Open
Curve:
0
Slab DT:
20 F
Max Temp.:
140 F
Gain:
0
T3-
EXT+
EXT-
P+
Enable/Disable
Dry Contact
Not Used

5RSM Digi-Elite Operation Manual
Startup Options
When the control is initiated for the rst time or after a manual reset, it will start its operation with the Startup Menu. Later, the
Startup menu can be accessed as an option from the operation menu. An option must be accepted in each screen in the Startup Menu
to move to the next level.
Display Unit
Options: ºF, ºCDefault: ºF
SET
SET
/<System Startup>/Display Unit
• The RSM-Elite will offer two different temperature displays. If ºF is selected, all temperatures will
display in Fahrenheit. If ºC is selected, all temperatures will display in Celsius.
DISPLAY UNIT:
F
C
Setting the Control to Factory Default
To Reset the RSM-Elite control to its original factory defaults, power down the control. Hold down
the SET and DOWN buttons while powering the control back up until the Loading Default
Values screen appears. The display will direct you to the Startup menu after the defaults are loaded
to program the control.
SET
Loading Default
Values...
NOTE: When resetting the control to original factory defaults, check all settings, as they will be over written.
Default Display
The default display will show the current System temperature and the Return temperature. In addition,
by clicking the Up or Down button, the display will show the current Outdoor temperature and the
current Return Target temperature.
SYSTEM= 168 F
RETURN= 125 F
SET
SET
SET
SET
SET
Outdoor= 28 F
RTN TGT= 123 F
Operating Menu Options
(Click SET Button
SET
SET
)
Curve
Options: From -10 to +10 Default: 0
SET
SET
/<Set Point>/Curve
• The Curve adjusts the nal Return Target based on the outdoor temperature. See Return Target
Table on page 6.
• A higher Curve number will result a higher Return Target for the same outdoor temperature.
• The best curve is the one with the lowest number that can still melt the snow. Thus, provide the
best snow melting efciency for that slab.
• When precipitation is expected, start the slab heating system and let it run at least 24 hours. This
time is needed to allow the slab temperature to reach the melting point.
Curve:
0 +2
Outdoor= 28 F
RTN TGT= 123 F
• When the precipitation begins and after a full 24 hour warm-up period, monitor the slab. Check if the precipitation is beginning to
accumulate or if it melts immediately.
• If there is accumulation, the slab temperature is too low. Increase the Curve value by one number (for example, from 0 to 1).
• If the precipitation is melting immediately, the slab may be using more energy than it needs. Decrease the Curve value by one
number (for example, from 0 to -1).
• After making a change in the Curve value, wait at least four hours to see what affect this change will have on the slab.
• Repeat the above procedure as necessary until the lowest Curve value which still melts precipitation is determined.

6
Return Target Temperature Table
Outdoor Temperature °F
35 30 25 20 15 10 5 0 -5 -10
Curve
-10 33 40 48 55 63 70 78 85 93 100
-9 36 44 52 60 67 75 83 91 98 106
-8 40 48 56 64 72 80 88 96 104 112
-7 44 52 60 69 77 85 93 102 110 118
-6 48 56 65 73 82 90 99 107 116 124
-5 51 60 69 78 86 95 104 113 121 130
-4 55 64 73 82 91 100 109 118 127 136
-3 59 68 77 87 96 105 114 124 133 142
-2 63 72 82 91 101 110 120 129 139 148
-1 66 76 86 96 105 115 125 135 144 154
070 80 90 100 110 120 130 140 150 160
174 84 94 105 115 125 135 146 156 166
278 88 99 109 120 130 141 151 162 172
381 92 103 114 124 135 146 157 167 178
485 96 107 118 129 140 151 162 173 184
589 100 111 123 134 145 156 168 179 190
693 104 116 127 139 150 162 173 185 196
796 108 120 132 143 155 167 179 190 202
8100 112 124 136 148 160 172 184 196 208
9104 116 128 141 153 165 177 190 202 214
10 108 120 133 145 158 170 183 195 208 220
Slab ΔT
Options: From 5°F/3°C to 50°F/28°CDefault: 20°F/11°C
SET
SET
/<Set Point>/Slab DT
• The.Slab ΔT is the design temperature difference between the slab supply temperature and the slab
return temperature of the heating uid. It is set to prevent too much heat from entering the slab in
a short time. Since, if large amounts of energy transferred to the slab exceeds a safe limit, the slab
may get damaged.
• This value is normally provided by the slab design engineer and must be adjusted to that setting to
prevent from damaging the slab.
• During the warm-up period, the RSM-Elite will modulate the motorized valve to regulate the
amount of energy entering the slab based on that setting. If that value is reached, the control will
modulate the motorized valve close to prevent sudden increases in slab temperature.
• If the design Slab ΔT is unknown, set it to the smallest possible value.
Slab DT:
20 F 25 F
WARNING
The adjustment of the Slab
ΔT to higher than the slab
design might crack the slab
during the heating process.
Outdoor Cutoff
Options: Off, 20ºF/-6ºC to 50ºF/10ºC, On Default: 38ºF/3ºF
SET
SET
/<Set Point>/Outdoor Cutoff
• The Outdoor temperatures can be viewed from the default screen by clicking the Up or Down
buttons.
• When the outdoor temperature falls to the adjustable Outdoor Cutoff temperature, the RSM-Elite
will control the System Pump and Motorized valve relays to heat the slab.
• When the outdoor temperature rises to the Outdoor Cutoff plus a 2°F differential, the RSM-Elite
will energize the Motorized Valve Close relay for 6 minutes to guarantee valve closure. This will
prevent the slab from getting heated during warmer outdoor temperature. The System relay will
remain energized for the Run-On delay.
Cutoff:
30 F 35 F

7RSM Digi-Elite Operation Manual
• In addition to the Outdoor Cutoff temperature setting range, it can be set to ON or OFF. If ON is selected, the System Relay will
energize regardless of the Outdoor temperature and the RSM-Elite will the control the motorized valve to hold the Return target
temperature. If OFF is selected, the System and Open relays will always be off.
Maximum Temperature
Options: From 70ºF/21ºC to 180ºF/82ºC Default: 140ºF/60ºC
SET
SET
/<Set Point>/Max Temp
• This is the highest water temperature the RSM-Elite will circulate through the slab.
• It should be set according to the slab design specication to avoid slab damage.
• Regardless of the other settings, the RSM-Elite will not allow the supply temperature to exceed this
setting. Thus, the Return will be signicantly less than this setting.
• The RSM-Elite will regulate the slab supply water temperature not to exceed the Maximum
Temperature. However, if that value is reached, the control will modulate the motorized valve close
relay to prevent excessive increases in slab temperature.
WARNING
The Maximum Temperature setting MUST NOT be set higher than the slab design temperature to avoid slab damage.
Max Tempt:
140 F 120 F
Gain
Options: From -10 to +10 Default: 0
SET
SET
/Settings>/Gain
• The Gain adjusts the aggressiveness of the RSM-Elite PID logic to control how much modulation
is changed when the slab supply and return temperatures change.
• A Gain of 0 is a good starting point for all systems.
• If during normal load conditions, the system value tends to oscillate, decrease the Gain by two
numbers (for example, from 0 to -2). Wait for at least 15 minutes before evaluating how the
change has affected the system.
Gain:
0 2
Run-On
Options: From 0 min to 60 min Default: 2 min
SET
SET
/Settings>/Run On
• The System relay will energize whenever the Outdoor temperature is below the Outdoor Cutoff.
When the Outdoor temperature increases 2°F above the Outdoor Cutoff, the System relay will stay
on for a period set by the Run-On. This allows the Pump to dissipate the residual heat within the
system back into the building.
• The Run-On time should be set based on the size of the boiler and pump.
Pump Run-On:
2m 6m
Slab Supply, Slab Return, and Outdoor Sensor Trim
Options: From -20Fº/-11Cº to +20Fº/+11Cº Default: 0Fº/0Cº
SET
SET
/<Maintenance>/Sys. Trm, Out. Trim, or Ret. Trim
• The Heat-Timer sensors are very accurate. However, sometime it might be benecial to adjust the
values to match an existing sensor. The Slab Supply, Slab Return, or Outdoor Trim value adjust the
respective Sensor reading using positive or negative values.
System Trim:
+0 F
Outdoor Trim:
+0 F
Return Trim:
+0 F

8
Valve Mode
Options: Auto, Close, Open Default: Auto
SET
SET
/<Maintenance>/Valve
•
The Auto option allows the RSM-Elite to modulate and pulse the valve open or close to achieve a
specic target temperature.
•
The Close option will energize the Close relay constantly. This option can be used during
equipment repairs and testing. This display will read MANUAL CLOSE.
•
The Open option will energize the Open relay constantly. In addition, the System relay will remain
energized. This option can be used during equipment repairs and testing. This display will read
MANUAL OPEN.
Valve Mode:
Auto
Close
Open
SYSTEM= 55 F
MANUAL CLOSE
SYSTEM= 55 F
MANUAL OPEN
Enable/Disable Input
•
The RSM-Elite will heat the slab only if the EXT± terminals are shorted. These terminals must
be connected to external equipment or switch to start the operation when needed. See Wiring the
Enable/Disable on page 4.
•
When the EXT± terminals are OPEN, the Target will display TSTAT OPEN. When they are
shorted, the heating of the slab will start..
NOTE: On a sensor fault while the EXT± terminals are shorted, the control will close the valve and
display SENSOR FAILURE. However, the system pump will remain energized until
either the Outdoor Cutoff is exceeded or the EXT± Terminals are opened.
SYSTEM= 70 F
TSTAT OPEN
SYSTEM= OPEN
SENSOR FAILURE

9RSM Digi-Elite Operation Manual
RSM-Elite Mechanical and Electrical Diagrams
Mechanical
Electrical
NOTE: The diagrams are conceptual only.
Heat-Timer is aware that each installation
is unique, however, the diagrams in
this document are to represent control
operation concept. It is the installer
responsibility to comply with local codes
and to install safety controls.
Slab
Slab
Pump
Slab Supply
Sensor
Outdoor
Sensor
T1 T2
COM COM
T3+
T3-
EXT+
EXT-
P+
P-
COM
24VAC
}Slab Supply Sensor }Outdoor Sensor }Slab Return Sensor }Enable Dry Contact }No Used
SET
®
C O R P O R A T I O N
R
SYSTEM = 147oF
RETURN = 122oF
Close Open System
Yellow Wires
Motorized
Valve
Red, White, Blue Wires
Slab
Return
Sensor
Hot Water
Supply
SET
T1 T2
COM COM
T3+
T3-
EXT+
EXT-
P+
P-
COM
24VAC
}Slab Supply Sensor }Outdoor Sensor }Slab Return Sensor }Enable Dry Contact }No Used
SET
®
C O R P O R A T I O N
R
SYSTEM = 147oF
RETURN = 122oF
Close Open System
Shield
Slab Supply Sensor
Shield
Outdoor Sensor
Shield
Slab Return Sensor
Enable/Disable Dry Contact
Open
Close
Com
Transformer
Motorized
Valve
L
N
120VAC
120VAC
120VAC
Yellow Wires
Slab Pump
Black
Wires
White Wire
Red Wire
Blue Wire
Motorized
Valve

10
Troubleshoot
No Display or LED Lights
Check the power to the RSM. The RSM-Elite requires 120VAC power to the Black wires or
24VAC to the right most terminals. Turn the power off and back on to restore the display. If
unsuccessful, make sure the Display Cover of the control is securely mounted to the Base.
System or Outdoor Reads OPEN or SHORT
If Open, short the sensor input terminals. The display should read Short. If it does, check the
sensor wiring. If it doesn’t, the RSM-Elite may be damaged.
If Short, remove the wires from the input terminals. The display should read Open. If it does,
check the sensor wiring. If it doesn’t, the RSM-Elite may be damaged.
System or Outdoor Reads an Incorrect Temperature
Remove the wires from the input terminals. The display should change to read Open. If it
doesn’t, the RSM-Elite may be damaged. Otherwise, take an ohm reading across the detached
sensor wires. The ohm reading should correspond to the Temperature Sensor Chart. If the
difference is within 5°F adjust the Trim of the sensor. Otherwise, the sensor may be damaged.
No Heat - All LEDs are OFF
 • OutdoorCutoff-Check the outdoor temperature and Outdoor Cutoff readings. If the outdoor
temperature is above the Outdoor Cutoff, the RSM-Elite will not give heat. The display will
shoe OUTDOOR CUTOFF. See Outdoor Cutoff on page 6.
 • TstatOpen-If the display shows TSTAT OPEN then, check the EXT± terminals. If the
EXT± terminals are not jumped together, the RSM-Elite will not give heat. See Enable/
Disable Input on page 8
 • ValveManuallyClosed-Finally, if the display shows MANUAL CLOSE then, the Valve
Mode has been set to Close. Change Valve mode to Auto. See Valve on page 8.
No Heat - System Pump LED ON - Pump Not Running
Remove any connections to the Yellow wires for the Heating System Pump. Test for continuity
across the pair of Yellow wires. If the meter registers continuity, the RSM-Elite is calling for the
Slab Pump to run and the problem is not with the RSM. Check the pump power source. Note
that the RSM does not source power to the outputs. See Pump Wiring on page 3.
RSM-Elite Does Not Move the Floating Motorized Valve
 • Firstcheckthevalvewiring-The RSM-Elite does not source power to the actuator.
Instead, a separate power source must be wired to the actuator as shown on page 3 for the
oating output.
 • Checkrelayoperation- Remove any wires connected the actuator. Set the Valve mode to
Close and check for continuity across the Red and Blue and across Red and White wires. The
meter should register continuity across the Red and Blue and should register no continuity
across the Red and White.Otherwise, the RSM-Elite may be damaged. Then, set the Valve
mode to Open and check for continuity across the Red and Blue and across Red and White
wires.. The meter should register no continuity across the Red and Blue and should register
continuity across the Red and White.Otherwise, the RSM-Elite may be damaged.
 • ValveManuallyClosed- Finally, if the display shows MANUAL CLOSE then, the Valve
mode has been set to Close. Change Valve mode to Auto. See Valve on page 8.
Snow Does not Melt or Slush is on the Ground
 • StartSlabMelting24HourEarly- If the slab heating system has not been active for at least
24 hours, the slab temperature may not be warm enough to melt the snow. It is recommended
to activate the heat to the slab at Least 24 hours before the snow.
 • AdjusttheCurve- If the snow accumulation occurs in colder temperature, then increase the
Curve setting. See Curve on page 5.
 • OutdoorCutoff-Check the outdoor temperature and Outdoor Cutoff readings. If the
Outdoor Cutoff is set too low, the RSM-Elite will not give heat. Increase the Outdoor Cutoff
above the current outdoor temperature. See Outdoor cutoff on page 6.
Temperature Sensor Chart
TEMPERATURE
(in Degrees °F)
Value
(in Ohms)
-30 117720
-20 82823
-10 59076
0 42683
10 31215
20 23089
25 19939
30 17264
35 14985
40 13040
45 11374
50 9944
55 8714
60 7653
70 5941
80 4649
90 3667
100 2914
110 2332
120 1879
130 1524
140 1243
150 1021
160 842
170 699
180 583
190 489
200 412
210 349
220 297
230 253
240 217
250 187

11 RSM Digi-Elite Operation Manual

12
RSM Specications
Voltage Input: . . . . . . 120 VAC 60 Hz(2 Black wires) /24VAC 60 Hz (24VAC terminals) (Only One Power Source)
Power Consumption: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 VA Max
Operating Temperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20°F to 120°F
Operating Humidity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20% to 80%
Dimensions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4”W x 4”H x 2½”
Weight: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 pound
Display: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back Lite 2 Line Alphanumeric LCD Display
Display Units: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fahrenheit (ºF) and Celsius (ºC)
Outputs: . . 3 S.P.S.T (Yellow = System Pump.), (White = Open MOV.), (Blue = Close MOV), (Red = Common MOV)
Output Relay Ratings: . . . . . . . . . . . . 1 Amp inductive (Maximum of 1/8 HP), 6Amp resistive at 120 VAC 60 Hz
Curve: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from -10 to +10
Slab ΔT: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5˚F (3˚C) To 50˚F (28˚C)
Maximum Temperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 70˚F (21˚C) to 180˚F (82˚C)
Outdoor Cutoff: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 20˚F (-7˚C) to 50˚F (10˚C), On, Off
Pump Run-On: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from 0 to 60 minutes
Valve Mode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto, Close , Open
Gain: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from -10 to +10
LED: . . . . . . . . . . . . . . . . 3 representing the Output relays (Left=Close, Middle=Open, Right=System Pump)
Inputs: . . . . . . . . . . 3 Temperature Sensors (Slab Supply, Slab Return, and Outdoor), and Enable/Disable input
Buttons: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 (Set, Up, Down)
Enable/Disable: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Terminals EXT+, EXT-
C O R P O R A T I O N
R
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HT #059091-00 A