Nailor D35SE User manual

Nailor Industries Inc. reserves the right to change any information concerning product or specification without notice or obligation.
INSTALLATION AND OPERATION MANUAL
ELECTRIC HEATERS FOR
VAV TERMINAL UNITS
Page 1 of 4
6/20 IOM-EHVAV (Supercedes 4/02)
GENERAL INFORMATION
•Nailor electric heaters require little or no maintenance.
Be sure the heater elements are free of foreign matter,
and then check that the connections are tight and proper
control interlocks have been made before turning the
heater on.
•Heaters are open wire type and, except on very small
heaters with element wires less than 1 kW, use special
‘arrowhead’ insulators that expose the entire surface area
of the element wires to the air stream. This eliminates the
possibility of hot spots on the larger wires that can burn
the elements in half or cause spalding that enhances hot
spots.
•All electric heaters ordered from Nailor are manufactured
in-house.
•All Nailor electric coils are ETL listed for safety under UL
1995 as part of the VAV unit.
•All electric heating units have built-in controls for all
options required by the engineer.
• Single point power connection.
INSTALLATION
•All single duct terminal units with electric coils are
designed to be mounted in a horizontal plane with respect
to the "UP" arrow marked on the product label. Fan
powered units can be flipped over in the field and will not
have "UP" arrow.
•Before applying power, make sure electric coils are not
damaged.
•All field wiring must comply with NEC and local building
codes.
• Use copper conductors only.
•Phase rotation of the incoming power is recommended
when connecting three-phase electric coils.
•Allow a minimum clearance as specified by NEC in front of
all electric coil enclosures.
•Always check product label to determine proper wire size
and current protection.
•These recommendations do not preclude NEC or local
building codes that may be in effect.
OPERATION
•To avoid possible nuisance tripping of the thermal cutouts
due to insufficient airflow, a minimum airflow of 70 cfm
(33L/s) per kilowatt must be maintained.
•For Single Duct Terminal Units, A minimum of .1” w.g. (25
Pa) of downstream static pressure is required to ensure
proper operation of the heater.
Figure 1. Fan Powered Terminal Unit with Electric Heater
Figure 2. Single Duct Terminal Unit with Electric Heater
CAUTION: ELECTRIC SHOCK HAZARD
1. Turn off power before servicing unit.
2. Do not operate unit without control cover.

Nailor Industries Inc. reserves the right to change any information concerning product or specification without notice or obligation.
6/20 IOM-EHVAV (Supercedes 4/02)
Page 2 of 4
FAN POWERED (UNITE TERMINALE @
TERMINAL UNIT VENTILATEUR INTEGRÉ)
DATE (DATE) : 27-Nov-2001 SERIAL NO. (NO. DE SÉRIE) : 150111-2
MODEL (MODÈLE) : D35SE TAG NO. (NO. DÈTIQUETTE) : FPB-1-35
UNIT SIZE-INLET SIZE : 4-10 VOLTAGE (VOLTAGE) : 480
(DIAMETRE D’ENTRÉE) PHASE (PHASE) : 3
CONTROL VOLTAGE : 24 STAGES (ÉTAPES) : 2
(VOLTAGE DE CONTRÔLE) HZ. (HZ) : 50/60
CONTROL SEQUENCE : NB MOTOR HP (MOTEUR HP) : 1/3
(SEQUENCE DE CONTRÔLE) MOTOR VOLTAGE : 277
VOLT AMP (VOLT-AMPÈRE) : 50 (VOLTAGE DU MOTEUR)
HOT WATER COIL ROWS : N/A MOTOR AMP : 2.0
(NOMBRE DE RANGÉES SERPENTIN EAUCAUDE) (AMPERAGE DU MOTEUR)
KW/HP AMPS AMPACITY MAX. OVERCURRENT PROTECTION MOTOR FUSE SIZE
(AMPÈRES) (AMPACITÉE) (RESISTANCE DES FUSIBLE MAX.) (MOTEUR FUSIBLE)
TOTAL EACH CIR. EACH STG. TOTAL EACH CIR. EACH STG. TOTAL EACH CIR. EACH STG. TOTAL EACH CIR.
(TOTALE) (CHAQUE (CHAQUE (TOTALE) (CHAQUE (CHAQUE (TOTALE) (CHAQUE (CHAQUE (TOTALE) (CHAQUE
CIRCUIT) ÉTAPE) CIRCUIT) ÉTAPE) CIRCUIT) ÉTAPE) CIRCUIT)
HEATER (CHAUFFAGE) 10.0 10.0 5.0 12.0 12.0 6.0 15.0 15.0 7.5 20 20 N/A
MOTOR (MOTEUR) 1/3 2.0 2.5 3 30
TOTAL (TOTALE) 14.0 17.5 23
EACH ELEMENT RATED @ 3.3 KW @ 277 VAC. AWG. MIN WIRE SIZE (MIN DIAMETRE DE FIL) : 14
(CHAQUE ELEMENT CLASSIFIER A) MIN. HEATING CFM (MIN. PCM) : 700
USE WIRE SUITABLE FOR AT LEAST 75 oC UTILISER UN FIL METALIQUE QUI CONVIENT AU MOIN 75 oC
L1 IS COLOR CODED BLACK , L2 IS BLUE, L3 IS RED L1 EST COLORÉ NOIRE, L2 EST BLUE , L3 EST ROUGE,
CONTROL WIRES CODED AS MARKED LES FILS DE CONTRÔLE SON INDENTIFIÉE COMME MARQUE,
USE COPPER CONDUCTORS ONLY. UTILISÉ DES CONDUCTEURS DE CUIVRE SEULEMENT.
USE CLASS K, RK1, A2D OR A6D FUSE OR HACR BREAKERS. UTILISÉ DES FUSIBLES CLASS K, RK1, A2D, OU A6D OU HACR DISJONCTEURS.
PRIMARY CFM (MAX/MIN) : 1000/1000 PRIMARY L/S (MAX/MIN) : 472/472
FAN CFM : FAN L/S :
NAMEPLATE LABEL
Electric coil data are incorporated in the nameplate label,
which is affixed to the control enclosure cover. The label
shows all necessary information required by UL with respect
to electrical power and circuit protection requirements.
HEATER CONTROL ENCLOSURE
Figure 4 shows the interior of a typical heater control
enclosure. All components within this space work together
to provide safe operation of the heater. Although it is not
required to meet NEC requirements, Nailor recommends a
door interlocking disconnect switch. This safety switch
must be disconnected before the enclosure can be opened.
In the absence of a disconnect switch, a terminal block
is provided for single point power connection. A ground
lug ensures the proper grounding of the unit housing and
enclosure. Line fuses and fan motor fuses provide
overcurrent protection, and come as an option. An airflow
switch de-energizes the heater when it detects no airflow
across the elements.
In fan powered VAV terminal units, auto-reset limit
switches in line with each element provide high temperature
protection. A single auto-reset limit switch provides
protection for single duct terminal unit heaters. These
switches automatically cut the heater off when overheating
occurs, and turn the heater back on when the elements have
cooled down. Manual-reset limit switches in line with each
element provide secondary over temperature protection in
single duct terminal units.
A control transformer is provided whenever a 24V circuit
is required. PE switches (when pneumatic controls are
used), like magnetic contactors, are used to energize
stages of electric heat. Small heaters may often use a load
carrying PE switch as the only control component. When
control systems require frequent cycling or silent operation,
mercury contactors are available as an option. An SCR
control will provide fine space temperature control and
highest reliability. For fan-powered terminal units, a fan
relay is provided when required or requested.
Figure 3. Sample Nameplate Label. Fan Powered Terminal Unit

Nailor Industries Inc. reserves the right to change any information concerning product or specification without notice or obligation.
Page 3 of 4
6/20 IOM-EHVAV (Supercedes 4/02)
Wiring Diagrams
A specific wiring diagram for each heater including all controls is glued to the inside of the control panel door. Another wiring diagram is
provided loose in the control box.
Heater Element Rack Replacement For Series Fan Powered Terminal Units
On series fan Powered Terminal Units, the element rack is removable for replacement. The header plate is located behind a
hinged door enclosure on the side of the terminal electric heater section.
1. Turn off power supply before servicing.
2. Locate the element rack header plate.
3. Before removing wires from the element rack header plate, mark where the wires are connected so they can be
reconnected correctly on the new element rack.
4. Remove the wires and screws holding the heater plate in the coil housing.
5. Insert the new element rack into coil housing and replace the screws to secure the element rack.
6. Replace the wires.
7. Replace the enclosure cover before turning on the power.
Figure 4: Typical Line Voltage Control Enclosure Box
Heater Rack
Header Plate
Heating Elements
Element
Terminations
Arrowhead Insulators
Auto-reset high limit cut-outs
Figure 5. Typical element rack for a series Fan Powered Terminal Unit

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"Complete Air Control and Distribution Solutions."www.nailor.com
6/20 IOM-EHVAV (Supercedes 4/02)
Page 4 of 4
Electric Heater Replacement Parts
Description RAPP Code
Disconnect Switches
Toggle Disconnect Switch 1P, 600V, 25A EC-DISTG251P
Toggle Disconnect Switch 3P, 600V, 40A EC-DISTG403P
Toggle Disconnect Switch 3P, 600V, 60A EC-DISTG603P
Interlocking Disconnect Switch 3P, 600V, 25A EC-DISINT25A
Interlocking Disconnect Switch 3P, 600V, 40A EC-DISINT40A
Interlocking Disconnect Switch 3P, 600V, 60A EC-DISINT60A
Interlocking Disconnect Handle EC-DISINTHDL
Interlocking Disconnect Shaft EC-DISINTSFT
Contactors
Contactor MAG 1P, 600V, 50Amp EC-CONM50A1P
Contactor MAG 1P, 600V, 40Amp EC-CONM40A1P
Contactor MAG 1P, 600V, 30Amp EC-CONM30A1P
Contactor MAG 2P, 600V, 50Amp EC-CONM50A2P
Contactor MAG 2P, 600V, 40Amp EC-CONM40A2P
Contactor MAG 2P, 600V, 30Amp EC-CONM30A2P
Contactor MAG 3P, 600V, 50Amp EC-CONM50A3P
Contactor MAG 3P, 600V, 40Amp EC-CONM40A3P
Contactor MAG 3P, 600V, 30Amp EC-CONM30A3P
SCR/SSR
SCR Elect. Heat controller, 600V, 1ph, 45A EC-SCR
SSR Elect. Heat controller, 600V, 1ph, 45A EC-SSR
Transformers
Transformer 120V, 24V, 50VA EC-TRANS120A
Transformer 208-240V, 24V, 50VA EC-TRANS208A
Transformer 277V, 24V, 50VA EC-TRANS277A
Transformer 480V, 24V, 50VA EC-TRANS480A
Isolation Transformer 24V, 24V, 40VA EC-TRANS2424
Transformer 120V/208/240/480 to 24V, 75VA EC-TRANSB
Transformer 277V, 24V, 75VA EC-TRANS277B
MISC
Airflow Switch EC-AFSW
Airflow Switch Probe 4" EC-AFSWPB
Airflow Switch Probe 6" EC-AFSWPBL
Auto Temp. LMT Swtch EC-AUTOLMTSW
Manual Temp. LMT Swtch EC-MANLMTSW
Fan Relay 24V EC-FANRELAY
Description RAPP Code
Power Distribution Blocks
2 pole, 175A, 600V, 1 in / 4 out H1-0271A
2 pole, 300V, 1 in / 4 out (quick connect) H1-0293
3 pole, 600V, 1 in / 4 out H1-0270
Power Terminal Blocks
1 pole, 600V H1-0044
2 pole, 600V H1-0076
3 pole, 600V H1-0004
Fuse
Fuse, 250V, 15A EC-FUS250V15
Fuse, 250V, 20A EC-FUS250V20
Fuse, 250V, 25A EC-FUS250V25
Fuse, 250V, 30A EC-FUS250V30
Fuse, 250V, 35A EC-FUS250V35
Fuse, 250V, 40A EC-FUS250V40
Fuse, 250V, 45A EC-FUS250V45
Fuse, 250V, 50A EC-FUS250V50
Fuse, 250V, 60A EC-FUS250V60
Fuse, 600V, 15A EC-FUS600V15
Fuse, 600V, 20A EC-FUS600V20
Fuse, 600V, 25A EC-FUS600V25
Fuse, 600V, 30A EC-FUS600V30
Fuse, 600V, 35A EC-FUS600V35
Fuse, 600V, 40A EC-FUS600V40
Fuse, 600V, 45A EC-FUS600V45
Fuse, 600V, 50A EC-FUS600V50
Fuse, 600V, 60A EC-FUS600V60