Trinity
│
Installation and Operation Instructions
Tft Series
52
Lead Lag Instructions
– Central Heating
Central Heat Demand Switch (Room Thermostat)
– connect to
R (24VAC)
and
CH2 (LL)
of the Master
Boiler; see
Field Wiring
Table 12-2b and Figure 12-2. Switch must be an isolated end switch (dry contact).
Central Heat Setpoint
– at the Master boiler only, set the
CH setpoint
via the
Lead Lag Master Configuration
menu, accessed as follows:
Configure
– Lead Lag Master Configuration – CH setpoint
Outdoor Reset Settings –
at the Master boiler only, set the
Outdoor reset
parameters via the
Lead Lag Master
Configuration
menu, accessed as follows:
Configure
– Lead Lag Master Configuration – Advanced Settings – Outdoor reset
CH Pump
– one boiler in the cascade can be chosen to operate the Central Heating pump via its
PUMP C
output; see
Field Wiring
Figure 12-1 and Table 12-1. From the respective boiler display, check the box next
to
Use for Lead Lag Master demands
for the CH Pump to ensure proper pump behavior. Menu access to the
CH Pump parameters is as follows:
Configure
– Pump Configuration – Central Heat pump – Use for Lead Lag Master demands
Lead Lag Instructions
– Domestic Hot Water
Tank Thermostat
– connect to
SENSOR COM
and
DHW
of the Master Boiler; see
Field Wiring
Table 12-2a
and Figure 12-2. Switch must be an isolated end switch (dry contact).
DHW Setpoint
– at the Master boiler only, set the
DHW setpoint
via the
Lead Lag Master Configuration
menu,
accessed as follows:
Configure
– Lead Lag Master Configuration – DHW setpoint
DHW switch (Lead Lag)
– at the Master boiler only, set
DHW switch
equal to
DHW (S6) sensor shorted
via the
Lead Lag Master Configuration
menu, accessed as follows:
Configure
– Lead Lag Master Configuration – Advanced Settings – Domestic Hot Water – DHW switch
DHW enable (Local)
– at the Master boiler only, set
DHW enable
equal to
Disabled
via the
Domestic Hot
Water Configuration
menu, accessed as follows:
Configure
– Domestic Hot Water Configuration – DHW enable
DHW Pump
– one boiler in the cascade can be chosen to operate the DHW pump via its
PUMP A
output; see
Field Wiring
Table 12-2b and Figure 12-2. From the respective boiler display, check the box next to
Use for
Lead Lag Master demands
for the DHW Pump to ensure proper pump behavior. Menu access to the DHW
Pump parameters is as follows:
Configure
– Pump Configuration – DHW pump – Use for Lead Lag Master demands
Tank Sensor
– when operating in a cascade system, the boiler controls do not support the
use of a tank sensor; a tank thermostat (switch) must be used.