Chromalox PF490-5 User Manual
Chromalox
®
DIVISION 4 SECTION
CXH-A
SALES
REFERENCE
DATE
SERVICE REFERENCE
PF490-5
161-302421-004
JULY, 2004
Installation Instructions
and
RENEWAL PARTS IDENTIFICATION
(Supersedes PF490-4)
© 2010 Chromalox, Inc.
Forced Air Heater
for Hazardous Locations
Overall Dimensions
5/8” UNC Tapped
Horiz. Air
(In.)
Mounting Hole
Locations
Discharge Wt.
Model kW Voltage and Phase (Ft.) BTUH CFM (Lbs.) A B C D E
CXH-A-03 3
208/240V-1 or 3Ø
28 10,236 700 127 19-1/8 23-7/8 21 3-1/2 13-5/8
480/575V-3Ø
CXH-A-05 5
208/240V-1 or 3Ø
28 17,060 700 127 19-1/8 23-7/8 21 3-1/2 13-5/8
480/575V-3Ø
CXH-A-07 7.5
208/240V-1 or 3Ø
32 25,590 840 133 19-1/8 23-7/8 21 3-1/2 13-5/8
480/575V-3Ø
CXH-A-10 10
240V-1 or 3Ø
32 34,120 840 138 19-1/8 23-7/8 21 3-1/2 13-5/8
208/480/575V-3Ø
CXH-A-15 15
208/240/480V
47 51,180 1450 150 25 27-7/8 21 4-13/32 17-5/8
575V-3Ø
CXH-A-18 18 240V-3Ø 43 61,420 1400 165 25 27-7/8 21 4-13/32 17-5/8
CXH-A-20 20 480/575V-3Ø 43 68,240 1400 165 25 27-7/8 21 4-13/32 17-5/8
CXH-A-25 25 480/575V-3Ø 54 85,300 2330 200 32-1/8 31-7/8 21-3/4 5-1/2 21-5/8
CXH-A-30 30 480/575V-3Ø 54 102,360 2330 200 32-1/8 31-7/8 21-3/4 5-1/2 21-5/8
CXH-A-35 35 480/575V-3Ø 54 119,420 2330 200 32-1/8 31-7/8 21-3/4 5-1/2 21-5/8
CXH-A-03 EP to CXH-A-35 EP
Class I - Groups C & D, Div. 1 & 2
Class II - Groups E, F & G
T3B - 165˚C (329˚F)
Table A – Specifications
B
A
11-1/16”
C
D
A
2”
2”
E
WARNING
Failure to understand and follow these installation instructions
and the WARNING notes contained therein may result in severe
personal injury, death or substantial property damage.
1. To reduce the risk of ignition of hazardous atmospheres:
In accordance with the National Electrical Code, do not install
where operating temperature code exceeds the ignition temperature of the hazardous atmosphere. Use only in atmospheres having an ignition temperature higher than 165˚ C (329˚ F).
2. Disconnect from supply circuit before opening enclosures.
3. Hazard of Electric Shock. Heater must be effectively grounded in
accordance with N.E.C. to eliminate shock hazard.
4. Heat exchanger contains Propylene Glycol under pressure at oper-
ating temperature. A material safety data sheet (MSDS) is available from Chromalox upon request. Should leakage occur,
remove unit from service and investigate cause.
5. Keep all electrical enclosure covers tightly closed and secured
with all bolts and threads. Cover joints must be clean before
replacing covers.
6. Install and operate in upright position only. Refer to Figure 3 for
level requirements. Failure to comply will cause overheating of
the element and shutting down the unit by tripping the high temperature cutout.
7. All unused threaded openings not used for supply wiring must be
fitted with threaded plugs approved for use in hazardous locations.
8. All unit electrical installation fittings, conduit, wiring and seals
must meet NEC and local codes for hazardous locations.
9. External line fusing or circuit breaker protection is required.
10. Hi limit cutouts must never be bypassed in the control circuit.
11. Alarm pilot lamp, if supplied, will turn on if the high limit control
actuates. Steady on lamp indicates manual reset protector has
tripped. This could result if the heat exchanger is obstructed
(dirty), inlet air restricted or fan not turning. Shut off power to
unit and refer to repair procedures section of instruction sheet.
12. Mounting clearances on nameplate must be observed.
13. Use copper wire for supply connections according to size and rat-
ing on nameplate.
14. Do not install any type of gasket material on any of the electrical
junction box cover surfaces.
15. Do not attempt to override louver stops or operate unit with lou-
vers fully closed.
2
GENERAL
The CXH-A series units rated 3 through 35 kW are designed
for operation in Class I, Div. 1, Groups C & D and Class II, Div.
1, Groups E, F and G hazardous atmospheres having an ignition
temperature of 165˚C (329˚F) or higher. They are designed for
comfort heating and should not be operated in ambient temperatures exceeding 40˚C (104˚F). All units in Table A are UL listed.
The units are easily adapted for wall, ceiling or pole mounting.
Refer to Figure 4 on Page 3 for mounting information. They are
supplied with either 24 or 120V internal control circuit voltage.
The heater is designed for use with an external hazardous location
thermostat or optional built-in thermostat.
The standard heater is designed to operate up to 7500
feet (2,286m) altitude. Consult factory for specific recommendations when using the units at higher altitudes.
Heavy gauge adjustable
louver with minimum
opening stops - to direct air flow
Removable front cover
for ease of cleaning
High efficiency heat
exchanger with integral
aluminum-finned steel tubes
Optional service light to
indicate when unit
needs servicing
Built-in 120V control
circuit transformer
(Optional 24V available)
Heavy duty immersion heater assembly
with manual reset limit control and
NEMA 7 and 9 terminal enclosure
Protective housing
for immersion heater
terminal enclosure
Convenient terminal
block for room
thermostat connection
Motor connections
wiring access
Explosion-proof
(NEMA 7 and 9)
controls enclosure
Integral, heavy duty
magnetic contactor
Explosion
proof motor
Mounting bolt
hanger connections
Polyester powder-coated
heavy gauge steel corrosion
resistant cabinet
Overpressure
protection device
3
The heaters may be mounted at any convenient height above
floor. The minimum spacings shown in Figure 4 should be maintained to adjacent walls and ceiling. If floor heat is desired, do not
mount higher than 8 to 10 feet above floor.
Controlling thermostats to individual heaters should be
mounted at shoulder height on inside walls or columns and clear
of the discharge air stream of the unit. Allow at least 4 in front of
heater for air stream to discharge freely.
Do not mount mercury type thermostat directly on unit,
vibration could cause malfunction.
Heater may be mounted on a shelf or stand from the bottom.
Be sure that mounting clearances are maintained and that bottom
of unit has at least 1 clearance underneath it. This is necessary for
good air circulation and servicing of heat exchanger. All mounting methods must allow for removal of front cover.
The mounting and anchoring provisions must take into
account the unit vibration and cantilevered loading when wall or
pole mounted. One of the Chromalox mounting kits shown in
Figures 5, 6 and 7 must be used whenever possible.
INSTALLATION
FIRE/EXPLOSION HAZARD. Mount only in upright
position and observe nameplate mounting clearances.
Heater Location instructions:
Arrange units so their discharge air streams:
A. are subjected to a minimum of interference from columns,
machinery and partitions.
B. wipe exposed walls without blowing directly at them.
C. are directed away from room occupants in comfort heating.
D. are directed along the windward side when installed in a
building exposed to a prevailing wind.
Locate thermostat on interior partition walls or posts away
from cold drafts, internal heat sources and away from heater discharge air streams.
Small rooms can be heated by one unit heater. Where two
walls are exposed, the heater should be mounted as shown in
Figure 2. Large rooms require multi-unit installations. Number
and capacity of units will be determined by volume of building
and square feet of floor area to be heated. Arrange units to provide perimeter air circulation where each unit supports the air
stream from another.
The CXH-A hazardous location heaters are designed for use
only in a permanently mounted upright position. We recommend
the use of a mounting kit (ceiling, wall or pole) available from
Chromalox. (Figures 5, 6 and 7)
The ceiling or wall mounting surface and the anchoring provision must be sufficient to support the combined weights of the
unit and mounting hardware.
If using mounting hardware or a supporting structure not
supplied by Chromalox, the unit should be suspended from the
supporting structure thru the two mounting points on top of the
unit with 5/8 NC bolts and lockwashers. If single point mounting
is desired, order the correct size Chromalox adapter bracket (P/N
027-302361-001 for 12” fan units, P/N 027-302361-002 for 16”
fan units) and P/N 027-302361-003 for 20” fan units. This bracket
is designed to hold the unit over its center of gravity with a 1 dia.
bolt. The maximum tilt angles as shown in Figure 3 must not be
exceeded in either direction during operation and installation.
Failure to comply will cause high limit shut down.
1/2" Max
13mm
1/2" Max
13mm
102mm Min. (4")
204mm
Min.
(8")
102mm
Min.
(4")
2"
5/8 NC (2)
Thds. For
Mounting
Figure 3
Maximum Out of Plane Allowance
Installation Clearances
Figure 4
EXPOSED
EXPOSED
EXPOSED
EXPOSED
EXPOSED
EXPOSED
Figure 2
4
MOUNTING KITS
Figure 5
Figure 7
Figure 9
Figure 6
Figure 10
Wall Mount Kit
Model # WMB-12 12” Fan (3-10 kW)
Model # WMB-16 16” Fan (15-20 kW)
Model # WMB-20 20” Fan (25-35 kW)
Pole or Wall Mount Kit
Model # PMB-12 12” Fan (3-10 kW)
Model # PMB-16 16” Fan (15-20 kW)
Model # PMB-20 20” Fan (25-35 kW)
Ceiling Mount Kit
Model # HMK-00
P
12” Fan - 16-3/4”
16” Fan - 18-1/2”
20” Fan - 22”
Wall
Bracket
1”ø Hardware % Bolt
Single Point
Swivel Mount
Supplied
1/2 ø Hardware
Not Supplied
Adapter Bracket
& 5/8 NC Hardware
Supplied
5-1/2” - 12” Fan
5-1/8” - 16” Fan
6-3/8” - 20” Fan
CXH-03EP through CXH-10 P=10”
CXH-10EP through CXH-20 P=11-1/2”
CXH-25EP through CXH-35 P=14-1/2”
4-7/8
4-9/16
Swivel Ceiling
Hanger S/A &
Hardware
5/8” ø Hex Nuts &
Washers
Cust. Supplied ø 1/2 Mounting
Hardware. Bracket Spacing
suitable for use with 4” U-Bolts
Supplied for
Installation
Top & Bottom
ø 5/8 Rods Length to suit
1” Min. Threaded Ends
Customer Supplied
CXH-03 through CXH-10 P=10”
CXH-10 through CXH-20 P=11-1/2”
CXH-25 through CXH-35 P=14-1/2”
Pole Base
3/8” ø Hardware
Required for
Mounting Cust. Supplied
6” Ref.
3-1/2” SCH. 40 Pipe
or 4” O.D. X .25 Wall
Tube Cust. Supplied
Length to Suit
P
Adapter Bracket
Supplied
with 5/8 Bolts
Single Point
Swivel 4”ø
Supplied
Pole Support
Bracket
Heater Mounting
Bracket Arm &
Hardware
ø 3/8 Hardware
Cust. Supplied
ø 1/2 x 4” U-Bolts
& Hardware
Cust. Supplied
5/8-11 Threaded
Mounting Holes (2)
1/2” NPT
Thermostat Entry
1” NPT
Top Line Supply
Entry
Unit Top View
Electrical
Components
Pilot Lamp
(Opt.)
Transformer
1” NPT
Jumper Wire
Contactor
Heat
Exchanger
Wiring
Compartment
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