FTG │Installation & Operation Manual
Boiler System Plumbing
FTG boilers use a low mass heat exchanger that requires a minimum rate of forced water circulation any time the
burner is operating (See Table 10-2 for minimum flow rate requirements). To ensure the minimum flow rate is
attained, carefully follow the plumbing instructions in this section.
Table 10-2 Minimum Flow Rate Requirements
Failure to ensure the minimum water flow rate through the boiler when the burner is
operating will result in “short-cycling”, reduced performance and operating efficiency,
and may also cause overheating and premature failure which will void the warranty.
Failure to follow instructions may result in fire, property damage, serious injury or death.
Circulating Pumps – FTG boilers are equipped with three sets of pump contacts:
1. DHW PUMP - operates during a Domestic Hot Water demand (DHW).
2. CH PUMP - operates during a Central Heat demand (CH).
3. BOILER PUMP - operates during any demand.
Ensure circulating pumps are oriented as per the manufacturers’ instructions. Wiring of these circulators will
depend on the system configuration selected; see Figures 10-3 and 10-4. For wiring details see Section 12.0.
Circulators responsible for forcing water flow through the boiler must be sized to
account for the head loss of the boiler and boiler piping at the required flow rate; see
Table 10-3 and Figure 10-2.
Table 10-3 Boiler Piping Size Requirements
To Next Page
Loading...
