MACH® Series
Gas-Fired Boiler
Installation
Page 20
Standby Mode:
The display defaults to this mode at startup or reset of
the control. If no key is pressed for 20 minutes the
display will return to this mode. The function of the
keys may be two-fold as shown below.
Key(S)
Duration
Function
Mode
momentary
Change to next mode
Reset
momentary
Reset the control
Plus
momentary
Show the comfort heat
setpoint, or max setpoint
(outdoor reset only)
Plus
long*
Turn the comfort heat system
on or off
Minus
momentary
Show the domestic hot water
setpoint
Minus
long*
Turn the domestic hot water
system on or off
*
Note: Long duration is greater than 2 seconds.
When in the Standby Mode the control indicates boiler
status with the first digit of the display. The remaining
digits indicate the boiler's actual temperature or
lockout code. The following table indicates the
meaning of the display digits when in the standby
level.
First Digit
Boiler Status
0
Burner off - No call for heat
1
Pre purge or post purge
2
Ignition
3
Burner on in Comfort Heat mode
4
Burner on in Domestic Hot Water mode
5
Checking the airflow switch
6
Burner off - An internal setpoint has been
reached. System is still calling for heat.
7
Burner off - Comfort Heat pump running on
delay. No system call for heat.
8
Burner off - Domestic Hot Water pump
running on delay. No system call for heat.
9 and b
flashing
Burner off – auto reset lockout. A code is
displayed indicating the reason for the
lockout. (See Troubleshooting Section
5.5.
)
A
Adjusting the 3 way valve if used
H
Burner on in manual high fire
L
Burner on in manual low fire
Parameter Mode:
The parameter mode is used to change the settings of
the boiler. The parameter mode is accessed by
pressing the MODE key several times until the
display shows
PArA
.
The parameters are selected with the STEP key, and
changed with the plus “+” and minus “-“ keys. Once
the desired value is reached, pressing the STORE key
accepts the new setting.
Parameters 1 through 4 are accessible directly at the
parameter level.
Parameters higher than 4 are only accessible by
authorized service personnel trained on the P-K
MACH Series Boiler.
Parameter
Description
Lower Limit
Upper
Limit
1
DHW setpoint
if used
68°
158°
2
DHW system
ON/OFF
0=OFF
1=ON
2=OFF +pump
continuous
3=ON + pump
continuous
3
Comfort heat
system
ON/OFF
0=OFF
1=ON
2=OFF +pump
continuous
3=ON + pump
continuous
4
Setpoint or
max boiler
temp outdoor
air mode
68°
182°
Information Mode:
The information mode is used to display the values of
the various sensors such as inlet water temp, outlet
water temp etc. The information mode is accessed by
pressing the MODE key several times until InFo is
displayed. The desired sensor is selected with the
STEP key. The following table indicates the
displayed value:
