Roberts Gorden CoRayVac CRV-B-10, Installation, Operation & Service Manual

Page: 49 / 94

SECTION 10: O
UTSIDE
A
IR
S
UPPLY
43 of 83
SECTION 10: OUTSIDE AIR SUPPLY
The CRV-Series system is appro v ed for u se w ith an
o u tside air system. Halogenated hydrocarbons or
other corrosi v e chemicals in the air can be dra w n into
the eq u ipment and serio u sly damage the system
components. A v oid the u se of s u ch chemical
compo u nds near the air inlet to the heaters.
IMPORTANT: If the b u ilding has a slight negati v e
press u re or corrosi v e contaminants are present in the
air, an o u tside comb u stion air s u pply to the heater is
req u ired.
All joints and seams in the air s u pply system m u st be
airtight. Attach the filter ho u sing to the b u rner
assembly u sing the w ing n u t pro v ided.
10.1 Pressurized
See Page 46, Figure 26 for a typical layo u t of a
press u rized air s u pply system.
For press u rized o u tside air s u pplies, the o u tside air
blo w er motor has a press u re s w itch that m u st be
u sed. Wire this s w itch in series w ith the p u mp
press u re s w itch. When u sing an o u tside air blo w er
w ith a ROBERTS GORDON
®
System Control or
ROBERTS GORDON
®
ULTRAVAC
™
control or relay
transformer, a separate load relay package is
req
u ired. Wire the control for the relay in parallel w ith
the p u mp. The o u tside air blo w er m u st ha v e a
separate 20 A, 120 V po w er s u pply. See Page 44,
Figure 23 for o u tside air blo w er internal w iring
req u irements. The o u tside air blo w er has an
adj u stable internal damper that sho u ld be w ide open.
On smaller systems (abo u t 3 b u rners) this damper
might need to be closed u p to half w ay if the press u re
s w itch does not make.
10.2 Non-Pressurized
For a non-press u rized o u tside air s u pply, a 4" (O.D.)
single w all pipe d u ct may be attached to the b u rner
and end v ent. For length and d u ct sizing
req u irements, see d u ct design r u les in Figure 22 . To
pre v ent condensation, ins u late the o u tside air d u ct.
CAUTION
Product Damage Hazard
Do not use heater in area containing
corrosive chemicals.
Refer to appropriate Material Safety Data
Sheets (MSDS).
Failure to follow these instructions can result
in product damage.