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INSTALLATION AND OPERATION INSTRUCTIONS
HWE-SS DIGI-E
Hydronic Single-Stage Boiler Control
Hot Water Control with Outdoor Reset, Set Point,
and DHW for Hydronic Heating Applications
2 Line Alphanumeric Display
Displays sensor values and
menu settings
Output Lights indicate
output status
SYSTEM =
TARGET =
Boiler
SET
Display Section Locking Screws
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.
3 Buttons to operate
the control
®
147F
150F
SYS
DHW
Pump
Pump
C O R P O R A T I O N
Elite Series
®
The HWE-Single Stage (HWE-SS) DIGI-SPAN Elite establishes
ambient comfort by varying the temperature of the heating
system's circulating hot water in response to changes in the outdoor
temperature. In addition, it provides an outdoor temperature based
cutoff, heating system pump control, and domestic hot water (DHW)
pump control. Two new features have been added to this control
including a customized reset ratio curve. A Set Point option was
added for applications where outdoor reset will not apply.
Two sensors are used, one to monitor the outdoor temperature, and
one to monitor the circulating hot water temperature in the heating
system. When the outdoor temperature falls below the Outdoor
Cutoff setting, the heating system is activated and the hot water
temperature is increased proportionally to satisfy the load. Should
it get warmer outdoors, the hot water temperature is automatically
lowered by the control. If the outdoor temperature continues to rise
to the outdoor cutoff setting then the heating system is turned off.
Black (120VAC power)
Blue (Boiler Output)
R
Yellow (System Pump Output )
White (DHW Pump Output )
WARNING
R
lItE
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Related Manuals for heat-timer Digi-Span Elite Series HWE-SS
Summary of Contents for heat-timer Digi-Span Elite Series HWE-SS
- Page 1 Display Section Locking Screws 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...
- Page 2 The HWE-SS 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.
- Page 3 When connected in that mode, it will be used as an input for the Outdoor Sensor Outdoor Cutoff only. • Only use the Heat-Timer outdoor sensor provided (HT# 904220-00). • Place the sensor in the shade on the north side of the building. Seal around sensor and wall •...
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Page 4: Startup Options
ORANGE N.O. S.P.S.T. Output Wiring 120VAC Power Wiring ALERT Sensor Wiring BLACK 24VAC Power Wiring DHW Call Setback/Boost Determining the proper location for the Outdoor Sensor is very important. The HWE-SS will base the heat on Wiring Wiring the outdoor temperature information it receives from this location. If the sensor is in the sun, or covered with N.O. -
Page 5: Default Screen
HWE-SS Elite Installation and Operation Manual Menus Startup Menu HEAT-TIMER CORP. DIGI-SPAN ELITE Loading Default DISPLAY UNIT: V1.00 c 2006 HWE-SS Values... Default Screen CONTROL MODE: SETUP COMPLETE! SENSOR FAULT: SYSTEM= 68 F Outdoor Reset PRESS SET Output On TARGET=... -
Page 6: Default Display
Outdoor Reset Mode • When Output-On is selected, the HWE-SS will energize the boiler and system relay when System reads Short or Open and Outdoor is below Outdoor Cutoff. Thus, the boiler will run on its limits. However, if the Outdoor sensor fails and the Outdoor reads Short or Open, the HWE-SS will change the Target Set Point to the Max Water Temperature. - Page 7 Offset=10°F Min Target=120°F Reset Ratio=1.5 : 1.0 Max Target=170°F HWE-SS Elite Installation and Operation Manual Max Target • If required: Adjust the RESET RATiO in cold weather. If the ambient building temperatures are too cold in cold weather, move the ratio to a higher selection. That is, if 1.00 (OD):1.00 (SYS) was initially selected, change the selection to 1.00 (OD):1.25 (SYS). If the building temperatures are too warm in cold weather, move the ratio to a lower selection.
- Page 8 Minimum Target Min Target: (Available when Startup Control Mode = Outdoor Reset) 120 F Options: From 70ºF/21ºC to 180ºF/77ºC Default: 70ºF/27ºC /Set Point/<Out. Reset>/Min. Tgt • The Minimum Target Temperature must be set to the boiler manufacturer’s specification. The HWE-SS will calculate the Target based on the Outdoor temperature (OD), the Reset Ratio, and the Offset value.
- Page 9 +0 F /<Maintenance>/Sys. Trm or Out. Trim • The Heat-Timer sensors are very accurate. However, sometime it might be beneficial to adjust Outdoor Trim: the values to match and existing system. The System and Outdoor Trim values adjust the System +0 F Sensor and Outdoor Sensor readings using positive or negative values.
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Page 10: Troubleshoot
Troubleshoot Temperature Sensor Chart TEMPERATURE Value No Display or LED Lights (in Degrees °F) (in Ohms) Check the power to the HWE-SS. The HWE-SS requires 120VAC power to the Black wires or 117720 24VAC to the right most terminals. Turn the power off and back on to restore the display. If 82823 unsuccessful, make sure the Display Cover of the control is securely mounted to the Base. - Page 11 System pumps with power and the control can break the hot leg. • Heat-Timer recommends using a separate power source to the control from any pumps, boilers, heavy electric equipment. C O R P O R A T I O N •...
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Page 12: Specifications
......... . Terminals EXT+, EXT- 20 New Dutch Lane, Fairfield, NJ 07004 973-575-4004 • Fax 973-575-4052 • http://www.heat-timer.com...
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