Roberts Gorden CoRayVac CRV-B-6 - Manual (Page 46)

CRV-S ERIES I NSTALLATION , O PERATION AND S ERVICE M ANUAL
40
FIGURE 21: Duct Sizing
10.3 Outside Air Blower Internal Wiring
FIGURE 22: Outside Air Blower Internal Wiring Diagram
Outside Air System Design Requirements:
Blower Performance (90707501):
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.
L
MOTOR
M N
BLK
WHT
T1 T3 T2
C NO
BLU BLU
BLOWER
PRESSURE
SWITCH
The outside air blower is shipped with the
blower manufacturer’s standard internal wiring.
For use with ROBERTS GORDON
® heaters,
the outside air blower must be rewired with
existing wires by the electrical contractor. See
diagram.
The internal 24 V transformer provided will not
be used and can be discarded.