43 750-265
Fig. 18. CH pump implementation.
Domestic Hot Water (DHW) Pump
The DWH pump function is implemented as shown in Fig. 19.
The DHW pump function turns on with overrun time for DHW
demand, assuming that the burner control is not locked out,
although this turn-on is delayed by a start delay time if the
burner is not already firing. This turn-on is also optionally
forced off by DHW anticondensation. The DHW pump turns
on without force-off and using a separate overrun timer for
DHW frost protection. It is forced off when DHW high limit is
active, except that manual control may still turn it on.
Table 24. CH Pump Parameters.
Parameter Comment
CH Pump Output None, Pump A, Pump B, Pump C
This parameter allows the CH pump function to be disconnected or to be attached to any of
the pump outputs.
CH Pump Control On, Auto
The CH pump can be turned on manually, or it can be set to operate automatically. If it is
turned on, it remains on until changed back to Auto.
In Auto mode it operates according to the demand sources listed for CH Pump Output and
the overrun time.
CH Pump Overrun Time MM: SS
This time indicates how long the CH pump should continue to run after CH pump demand or
LL slave demand ends.
M28030
DEMAND PRIORITY = CH
CH ANTI-COND ENABLED
CH ANTI-COND ACTIVE
CH ANTI-COND “PUMP OFF” SELECTED
BOILER PUMP
HAS ITS OWN
OVERRUN TIMER
DEMAND PRIORITY = LL
CH PUMP
OUTPUT
FORCE OFF
CH
LL SLAVE
IF THE PUMP IS NOT
FORCED OFF AND IT
SHOULD BE ON,
THEN TURN IT ON.
BURNER STATE = OK
• NOT INTERNAL FAULT
• NOT DISABLED (E.G. BURNER SWITCH)
• NOT DISABLED BY PARAM ERROR
• NOT LOCKED OUT
• NOT ANTI-SHORT-CYCLE
CH PUMP CONTROL: ON
(SELECTIONS ARE:
ON/AUTO)
AUXILIARY PUMP
HAS ITS OWN
ON/AUTO CONTROL
OUTLET HIGH
LIMIT ACTIVE
HIGH LIMITS AND
MANUAL CONTROL
DO NOT CAUSE
OVERRUN TIME
CH FROST PROTECTION PUMP DEMAND
EXERCISE PUMP DEMAND
PARAMETER
OTHER NAMES ARE INTERNAL SIGNALS.
CONNECTION TO PUMP A, B, OR C
1–9 ON/OFF PRIORITY.
CIRCLED NUMBERS ARE REASONS WHY PUMP IS ON.
NUMBERS WITHIN SQUARES ARE REASONS WHY PUMP IS OFF.
THE LOWEST NUMBERED REASON THAT EXPLAINS THE
ACTUAL PUMP CONDITION IS USED.
BOILER PUMP
DEMAND AND
STATUS FROM CH
AUXILIARY PUMP
DEMAND AND STATUS
FROM CH
EXERCISE PUMP ONLY IF
IT IS NOT FORCED OFF.
TURN ON THE PUMP
FOR CH DEMAND OR
LL SLAVE DEMAND.
LOAD
OVERRUN TIME
CLEAR (INHIBIT)
INHIBIT OVERRUN
IF FORCED OFF.
LOAD
OVERRUN TIME
FROST PROTECTION
AND OVERRUN
TO BOILER PUMP
LL SLAVE BURNER DEMAND
3
4
9
6
7
5
1
2
8
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