Freeze Protection
To enable freeze protection, dip switch position 7 (on
the PIM) must be turned on (UP position). This is the
default position.
If the water temperature drops below 45˚F on the
Outlet or Inlet sensors, the Boiler pump is enabled.
The pump is turned off when both the Inlet and Outlet
temperatures rise above 50˚F.
If either the Outlet or Inlet temperature drops below
38°F, the VERSA starts the burner at the minimum fir-
ing rate. The burner cycle will terminate when both the
Inlet and Outlet temperatures rise above 42°F.
Controls
Outdoor Installation
Outdoor models must be vented with listed vent mate-
rial per the following instructions and installed with the
optional factory-supplied outdoor vent kit. A special
vent terminal (Option D-11) is provided in accordance
with CSA requirements. These must be installed as
illustrated in Fig. 28.
Care must be taken when locating the unit outdoors,
because the flue gases discharged from the vent cap
can condense as they leave the cap. Improper location
can result in damage to adjacent structures or building
finish. For maximum efficiency and safety, the follow-
ing precautions must be observed:
1. Outdoor models must be installed outdoors and
must use the outdoor vent cap available from the
manufacturer (sales order option D-11).
2. Periodically check venting system. The unit’s
venting areas must never be obstructed in any
way and minimum clearances must be observed
to prevent restriction of combustion and ventilation
air. Keep area clear and free of combustible and
flammable materials.
3. Do not locate adjacent to any window, door, walk-
way, or gravity air intake. The vent must be
located a minimum of 4 ft horizontally from such
areas.
4. Install above grade level and above normal snow
levels.
5. Vent terminal must be at least 3 ft above any
forced air inlet located within 10 ft.
6. Adjacent brick or masonry surfaces must be pro-
tected to prevent condensate from damaging
exterior finishes. Use a 300-series stainless steel
backing plate against brick or masonry surfaces.
WARNING:
Installation, adjustment and service of
controls, including timing of various operating func-
tions, must be performed by a qualified installer,
service agency or the gas supplier. Failure to do so
may result in control damage, malfunction, property
damage, personal injury, or death.
WARNING:
Turn off power to the boiler before
installing, adjusting or servicing any controls. Failure
to do so may result in board damage, malfunction,
property damage, personal injury, or death.
Model
No.
Size
(in.)
Approved
Plastic
Terminals
Approved SS
Terminals
300A
4
PVC Tee Sch 40*,
Centrotherm™
Polypropylene
FasNSeal FSTT4,
Z-Vent 2SVSTTF04
400A
500A
700A
6
PVC Tee Sch 40*,
Centrotherm™
Polypropylene
FasNSeal FSTT6,
Heat Fab 9690TEE
850A
*Must be ULC-S636 materials in Canada.
Table R: Outdoor Vent Terminals
NOTE:
The vent cap must be listed and approved
by the boiler manufacturer in accordance with its
listing (sales order option D-11).
NOTE:
Condensate can freeze on the vent terminal.
Frozen condensate on the vent terminal can result in
a blocked flue condition.
NOTE: MUST BE EXTERNALLY
SUPPORTED
Fig. 28: Outdoor Venting
34
Summary of Contents for 300A
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