Outside Air Blower Internal Wiring; Figure 30: Duct Sizing; Figure 31: Outside Air Blower Internal Wiring Diagram - Roberts Gorden Corayvac CRV-B Series Installation, Operation & Service Manual

FIGURE 30: Duct Sizing

Outside Air System Design Requirements:
Blower Performance (90707501K):
112 Flow Units
One outside air blower is required per each EP-100 or
EP-200 series pump and two outside air blowers may
be required for each EP-300 series pump. Outside air
blowers cannot be shared between two separate CRV-
Series systems.
Duct Design Rules:
- System should be designed so that the blower is
positioned closest to the highest flow
requirements (end vents).
- When a duct is carrying more than 40 flow units, it
must be at least 6" (15 cm) diameter.
Pressurized Systems
- 6" (15 cm) diameter duct must not exceed 120'
(36 m) total per system.
- 4" (10 cm) diameter duct must not exceed 120'
(36 m) per radiant branch.
Non Pressurized
- 6" (15 cm) diameter duct must not exceed 90'
(27 m) maximum 100 flow units
- 4" (10 cm) diameter duct must not exceed 90'
(27 m)
- Elbows are equivalent to 10' (3 m) of duct length.

10.3 Outside Air Blower Internal Wiring

FIGURE 31: Outside Air Blower Internal Wiring Diagram

The outside air blower is shipped with the
blower manufacturer's standard internal wiring.
For use with ROBERTS GORDON
the outside air blower must be rewired with
existing wires by the electrical contractor. See
diagram.
NOTE: The internal 24 V relay provided will
not be used and can be discarded.
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BLOWER
PRESSURE
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SECTION 10: O A S
UTSIDE IR UPPLY
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