System Settings; Setback; Purge Delay; System Run-On - heat-timer Mini-MOD-CNC Installation And Operation Instructions Manual

24 Heat-Timer Corp.

systeM settIngs

Button: MENU/<System Settings>
Settings 1 and Settings 2 menus provide access to adjusting and fine-tuning the system for
enhanced comfort and better fuel savings. The Mini-MOD-CNC behaves differently based on
the selected Control Modes. See "Startup Settings" on page 16.
To be able to change the Mini-MOD-CNC settings the Program/Run Switch must
be set to Program. The switch is located under the Enclosure Wiring Cover for
security. The Enclosure Wiring Cover can be securely closed using a lock.

setBack

Adjustable from 0F°/0C° to 75F°/42C°
Button: MENU/<System Settings>/Setback
• The Setback feature can be used to provide the Mini-MOD-CNC with a lower temperature
Set Point when less load is required.
• The lower Set Point will appear on the main display indicating this condition.
• For example, if the calculated temperature is 180°F and the Setback is 20°F, then when in
Setback or Night Schedule, the Mini-MOD-CNC will hold a Set Point of 160°F = 180°F-
20°F. See "Day/Night Schedules" on page 28.
• A typical use for Setback is to provide less system temperature to a building during the
Night Schedule or on the weekends when the building is not occupied, but heat is still
required.
• The amount of Setback selected is subtracted from the Set Point when a Setback Input
Signal is received or the Night Time schedule setting started.
• If Setback is selected as the Shutdown/Tstat/Setback Mode (See "Shutdown/Tstat/Setback
Mode" on page 19), the Setback will not be activated unless a Short dry-contact signal is
received on terminals (31 and 32).
• If Shutdown or Tstat is selected as the Shutdown/Tstat/Setback Mode (See "Shutdown/Tstat/
Setback Mode" on page 19), the Setback will be activated only when the Night Schedule time
has started.

purge delay

Adjustable from 0.0min to 10.0min
Button: MENU/<System Settings>/Purge Delay
• Many boilers go through a purge cycle before they are brought on line. When the
Mini-MOD-CNC activates a boiler, it does not start to calculate its output until the Purge
Delay is over. This allows the boiler to fully come online and begin producing output.
• The Purge Delay helps prevent short cycling of any newly activated burner. Once the
burner is activated, it MUST run through the entire Purge Delay period.
• The minimum Purge Delay setting MUST be set to the time required by the boiler
manufacturer. Time entry is in 0.1 of a minute (i.e. 1.5min will equal 90 seconds.)
• The Message Display Line will display Purge Delay and the amount of Purge remaining.

systeM run-on

Adjustable from 0min to 360min
Button: MENU/<System Settings>/System run-On
• The SYS relay will energize whenever the outdoor temperature is below the Outdoor Cutoff
and the Shutdown is Open or the Tstat is closed. When the Outdoor temperature rises 2°F
above the Outdoor Cutoff or the control is switched to Summer and after the last burner
relay has de-energized, the SYS relay will remain energized for the System Run-On period.
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
INPUT RATINGS:
115VAC 60Hz , 12VA MAX
USE COPPER CONDUCTORS ONLY
alert
ENCLOSED
ENERGY
MANAGEMENT
EQUIPMENT
99RA
CAUTION
: RISK OF ELECTRIC SHOCK
More than one disconnect switch may be required
to de-energize the equipment before servicing.
Default: 0F°/0C°
stage will not turn off until both
this case, Soft-Off will start after
Default: 1.0min
manufacturer recommendation.
Default: 0min
SYSTEM
----- SETTINGS 1 ----
Setback
A
Purge Delay 1.0min
System Run-On 0min
Lead Rotation Time
B
<More Settings>
▲ C ▼ SELECT
BACK
----- SETTINGS 2 ----
D
Standby Time 10min
Last Stg Hold
<Lead Stages>
<Staging Settings>
<Mdlating Settings>
<Day/Night Schdule>
▲ ▼ SELECT
BACK
PROGRAM
------- SETBACK -------
5 o
F
[
▲ ▼
BACK
alert
When using Soft-Off and Last
Stage Hold, the last boiler
parameters have elapsed. In
the Last Stage Hold.
--- PURGE DELAY ---
1.0 min
[
▲ ▼
BACK
alert
Set Purge Delay as per boiler
-- SYSTEM RUN-ON --
5 min
[
▲ ▼
BACK
M
Full Modula
o
0 F
o
0 F
RUN
]
SAVE
]
SAVE
]
SAVE