System Settings; Maximum Water Temp; Gain; Lead Boiler Rotation - heat-timer Mini-Extension Installation And Operations

18 Heat-Timer Corp.

MAXIMUM WATER TEMP

Adjustable 90ºF - 240ºF
Button: MENU/Set Point/Offset/..../Maximum Water Temperature
• This is the highest temperature heating water the Mini-MOD will circulate through the
heating system. It is available in Reset mode only.
• When using a radiation system, it should be set according to the tubing or floor
manufacturer's specification.
• The Maximum Temperature must be at least 20°F higher than the Minimum Temperature.

SYSTEM SETTINGS

Button: MENU/<System Settings>
The Settings 1 and Settings 2 menus provide access to adjusting and fine-tuning the system for
enhanced comfort and more fuel savings. The Mini-MOD behaves differently based on the
selected Control Modes (see Startup Settings).
•

Gain

• Lead Rotation
• Purge Delay
• Lag Delay
• Standby Time
To be able to change the Mini-MOD 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.
GAIN
Adjustable -10 to +10
Button: MENU/<System Settings>/Gain
• The Gain adjusts the aggressiveness of the Mini-MOD PID logic to control how much
modulation is changed when the system temperature is different from the Set Point.
• A Gain of 0 is a good starting point for all systems.
• If during normal load conditions, the system temperature tends to fluctuate significantly,
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.
• If, during normal load conditions the system temperature tends to remain consistently
below the Set Point (or consistently above the Set Point), increase 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.

LEAD BOILER ROTATION

Adjustable Manual, Time (1 hr to 60 Days), Last-On
Button: MENU/<System Settings>/Lead Rotation
• The Lead Boiler is the first boiler brought on when output is required.
• The Lead Boiler can be rotated automatically, manually or based on Last-On. The
automatic rotation is recommended.
• The current Lead Boiler is shown in brackets on the main display.
• Only Boilers which are set to Auto Mode can be Lead. Therefore, not all the Boilers may
be available when manually selecting a new Lead Boiler.
• System Run-On
• Setback
• Last Stage Hold
• Day/Night Schedules
CAUTION
Default: Time (24Hours)
--- MAXIMUM WATER TEMP ----
Default: 240ºF
in Reset only
[]
BACK
---- ---- -- S ETT ING S 1 -- --- --- --
Ga in
Le ad R otat ion
Pur ge D ela y
Lag Del ay
<Mor e Se tti ngs >
BAC K
-- --- --- -- SE TTI NGS 2 --- --- --- -
St and by Ti me
Sy stem Run -On
Set bac k
Las t Sta ge H old
S et T ime
<D ay/N ight Sch edul es>
BA CK
-- --- --- --- --- -- GA IN - --- ---- --- ---
Default: 0
[
BAC K
- --- ---- LEA D RO TAT ION ---- ---
Man ual
T ime
Las t-O n
BAC K
- -- A UTO ROTA TE P ERI OD -- -
[
BAC K
- --- MAN UAL L EAD STAG E -- --
A
B
C
D
E
BAC K
240
F
SAVE
+ 0
Tim e
0. 0mi n
0 min
SE LECT
1 0mi n
0min
0 F
0 F
12: 03P m
SE LEC T
PROGRAM RUN
+ 0
F
]
SA VE
SA VE
24
hrs
]
SA VE
SA VE