ECR International ULTIMATE PF Series, Installation Manual And Operating Instructions

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15
L8151 CONTROL SETTINGS
Use the following setting for the first adjustment:
High Setting ...................180°F
Low Setting ....................160°F
Differential ........................20°F
These settings may be altered based on the heating
system response. During very cold weather if the
heating system does not provide quite enough
heat, the high limit control setting may be raised to
a maximum of 200°F. If more domestic hot water is
required, the low limit control setting may also be
raised to a maximum of 180°F. Whenever adjusting
either the high or low limit, the high limit control
setting must be set at least 20°F above the low
limit. The differential control setting is typically 20°F
but may be adjusted to vary the time it takes the
burner to respond to a call for domestic hot water.
COLD STANDBY
1. Cold standby is suitable only when thermostatic
union is used with piping bypass shown in
Figure #6.
2. A change in control wiring is also required. To
prevent excessive condensation, please contact
factory before making this change.
3. Owners of non-tankless boilers often object to the
burner starting when space heat is not required.
To avoid this, an optional outside thermostat may
be used to shut down the system totally when
outside temperature is above a specific limit set
by the homeowner. See wiring diagrams.
SYSTEM PIPING (Indoor Boilers) Continued
TYPICAL TANKLESS COIL PIPING
Figure #7