Chromalox PF421-6 User manual

(Supersedes PF421-5)
PF421-6
EH-HVT
161-048557-001
APRIL, 2003
4
and
Installation, Operation
RENEWAL PARTS IDENTIFICATION
Type EH and HVT Electric Utility Heater
Specifications– TableA
GENERAL
FIRE HAZARD. Since heaters are capable of devel-
oping high temperatures, extreme care should be
taken to:
A. Locate on vertical wall with length of heater positioned horizon-
tally. HVT models must be installed with thermostat at right end;
B. Avoid mounting into a wall recess since such mounting interferes
with free air circulation, increases heater temperatures, and pre-
vents proper thermostat operation on HVT models;
C. Mount heaters with a minimum clearance of 24” above floor level
or from adjacent wall;
D. Keep all combustible materials a minimum of 4” from front and
top of heater.
1. Remove screw from each end and remove perforated cover.
2. After feeding electrical wiring through opening in back of heater
(See WIRING section), mount back of heater to wall with four
screws (HVT models-5/16” diameter holes on 5” x 25-7/8”) (EH
models 9/32” diameter holes on 5x12-1/2” centers) through back
of heater. Leave one pair of end screws snug, but not tight, to avoid
expansion noise due to binding.
Type HVT*
NOTICE: Carefully removeheater from carton andcheck for
shipping damage. Any damageclaimsshouldbeentered
immediately with thecarrier.
Dim. “A”
Model VoltSWattS(In.)BTUH
EH-1221 120 250 145/8853
EH-1221 240 250 145/8853
EH-1251 120 500 145/81706
EH-1251 240 500 145/81706
HVT-1251* 120 500 285/81706
HVT-2411* 120 1000 285/83412
*HVT models are equipped with a 55°F to 110°F adjustable thermostat.
Type EH Thermostat
(HVT Only)
A (HVT)
A (EH)
63/4”
33/4”
© 2010 Chromalox®, Inc.

OPERATION
MAINTENANCE
FIRE HAZARD. Keep combustible materials and
such fabrics at least 4” away from front of cover or
above cover. Failure to comply could result in per-
sonal injury or property damage.
FIRE/EXPLOSION HAZARD. This heater is not
intended for use in hazardous atmospheres where
flammable vapors, gases, liquids or other com-
bustible atmospheres are present as defined in the
National Electrical Code. Failure to comply can
result in personal injury or property damage.
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property dam-
age. Heater must be installed by a qualified person
in accordance with the National Electrical Code,
NFPA 70.
1. Following long periods of idleness, heater should be vacuumed
before start-up to remove accumulated combustible particles
which will incinerate causing smoking and consequent wall dis-
coloration.
2. If heater is located in areas of heavy traffic, furnish suitable heater
guard (wall mounted pipe rail in front of case, for example) to pre-
vent damage to heater.
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property dam-
age. Heater must be installed by a qualified person
in accordance with the National Electrical Code,
NFPA 70.
ELECTRIC SHOCK HAZARD. Any installation involv-
ing electric heaters must be performed by a quali-
fied person and must be effectively grounded in
accordance with the National Electrical Code to
eliminate shock hazard.
Note: Electrical wiring is to be in accordance with National
Electrical Code.
1. Electrical wiring enters heater case through 7/8” opening in back
of heater.
2. Grounding conductor, with green insulation, should be secured
under green colored ground screw located in wiring compartment.
(See Figures 1 and 2).
3. HVT Model only — The white insulated lead of the incoming
power line should be attached to the L1 terminal of the terminal
block. (See Figure 2)
4. Replace cover and end screws (removed in step 4, MOUNTING
section).
WIRING
Figure 1Figure 2
Heaters
Ground
Heaters
Ground
Thermostat
L1 L2
2

3
THERMOSTAT REPLACEMENT PROCEDURE
Thermostat Kit (168-073659-001)
Item
No. Qty. Part No. Description
11 300-072275-007 Thermostat
21 027-073304-002 Bracket — Mounting
32 248-048179-020 Screws
41 220-072276-003 Plate-Dial Thermostat
51 169-073294-001 Knob
61 056-073305-001 Clamp — Capillary Bulb
1
2
3
45
6
See Instruction #4
See Instruction #1
Thermostat Replacement Instructions:
1. Remove cover.
2. Slide thermostat mounting bracket over existing plate.
3. Using item 3(screws) assemble item 1(thermostat) to item 2(bracket).
4. Remove bolt and assemble item 6capillary clamp and capillary bulb and
re-install bolt. Note: Do not pinch bulb in clamp, thermostat decalibration
will result.
5. Assemble item 4(plate) and item 5(knob).
6. Re-install cover.
RENEWAL PARTS IDENTIFICATION
Heating Elements
Front Terminal Thermostat Kit
Model WattsCover 120V 240V Block (See Below)
EH-1221 250 080-016362-002 285-051049-001 285-051049-002
EH-1251 500 080-016362-002 285-051049-001 (2) 285-051049-002 (2)
HVT-1251 500 080-016362-003 285-051049-006 303-047610-005 168-073659-001
HVT-2411 1000 080-016362-003 285-051049-006 (2) 303-047610-005 168-073659-001
Note:Part numbers suffixed by a number in ( ) indicates the quantity of same part number used.

2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: [phone] www.chromalox.com
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.