Mounting The Controller; Wiring Power Input - heat-timer DiGi-SPAN Elite Series Assembly, Installation And Operation Instructions

An optional Boiler Return water sensor is provided to avoid thermal shock to the boiler
and, therefore, to help prolong boiler life. If the sensor registers that the boiler return
water is colder than 120°F, the HWE-MOV immediately lowers the temperature of the
circulating heating water to reduce the load on the boiler, allowing the return water
temperature to rise.
Type of Radiation in Building
Radiators (Steel & Cast Iron)
Baseboard (Finned copper tube& Cast Iron)
Radiant (High Mass/Concrete)
Radiant (Low Mass/Joists)
Fan Coils & Air Handlers

Mounting the Controller

• The HWE-MOV DIGI-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 HWE-MOV in a convenient location near the unit to be controlled.
• Mount the HWE-MOV 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 HWE-MOV 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 HWE-MOV 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 HWE-MOV.
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 HWE-MOV marked 24VAC and COM.
Wire Colors and Output Lights
• The HWE-MOV has a three S.P.S.T. (single-pole single-throw N.O.) relays. Each output is rated at 1A pilot duty (1/8 HP) or 6 A
resistive at 120VAC 60Hz.
• The HWE-MOV 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 left LED.
• 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.
Sensor Wiring
Reset Ratio
1.00 (OD) : 1.00 (SYS)
1.00 (OD) : 1.00 (SYS)
4.00 (OD) : 1.00 (SYS)
2.00 (OD) : 1.00 (SYS)
1.00 (OD) : 1.00 (SYS)
Boiler
Output Wiring
N.O.
YELLOW
24VAC Power Wiring
2
Offset
0˚F
0˚F
-10˚F
-10˚F
20˚F
Base Section
T1 COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
Input Terminals 24VAC optional power input
S.P.S.T. Output Wiring
N.O.
System Pump
Output Wiring
N.O.
ORANGE
Return Sensor
Wiring
1:4 1:3 1:2
12 11 10
220
210
200
190
180
170
160
150
140
130
120
110
100
70 60 50 40 30 20 10
Outdoor Temperature (in °F)
Reset Ratio Curves
Reset Ratios are presented as
Outdoor : Water
Display Section
Base Mounting Holes
Boiler
Output Wiring
N.O.
YELLOW
Display Cover Mounting Screws
120VAC Power Wiring
Sensor Wiring
24VAC Power Wiring
T1 COM T2 COM T3+ T3- EXT+ EXT- P+ P- COM 24VAC
Floating Motorized Valve
24VAC Power Source
1:1.5
9
8
1:1.25
7
1:1
6
1.25:1
5
1.5:1
4
2:1
3
3:1
2
4:1
1
8:1
0 -10 -20
S.P.S.T.
BLACK
120VAC Power Source
BLACK
Output Wiring
WHITE
OPEN.
Floating
N.O.
RED
Motorized
COM
Valve
N.O.
BLUE
CLOSE
Setback/Boost
Wiring
T