Marley Engineered Products M Series - Manual (Page 2)

INSTALLATION
The Marley Engineered Products radiant heater is shipped
fully assembled. The heater can be hung from the ceiling with 4
chains or rigid angle brackets attached to the heater brackets
located on the back of the heater, for 2 and 4.5 kW heaters,
chains can be attached to the four holes in the corners of the back
reflector. Optional hanging chain kits are available for these
heaters that will allow for installations 2 to 6 feet from the ceiling.
(Model MHK) (See Figure 1.) Minimum spacings:
Ceiling to top of heater is 2 feet.
Wall to sides of heater is 3 feet.
Floor to bottom of heater is 10 feet.
NOTE: Installer should consult state and local codes and meet
any applicable requirements regarding this installation.
WIRING
1. Use heater only at the voltage specified on the nameplate.
2. Branch circuit wire for connection to heater must be at least
90°C wire. Use copper conductors only.
3. Heater can be wired with rigid or flexible conduit.
4. Refer to Table 1 for proper supply wiring size.
5. The heater connection points are located in the gasketed
terminal enclosure. To remove cover, remove 4 screws on the
cover. Remove the cover to expose wiring connection points.
6. A green ground terminal is provided in the bottom of the
enclosure. The ground wire should be connected before other
connections are made.
7. Attach power to pigtail leads L1 and L2 (or L1, L2 & L3 on 3
phase models) using appropriate listed connectors.
NOTE: All 3 element heaters are factory pre-wired for 3-phase
delta operation. Some units can be converted to single phase
operation by changing the wiring. Refer to Table 1 for those
heaters that can be converted to single phase. The appropriate
wiring diagram (Figure 2) is also located on the bottom of the
enclosure.
INSTRUCTIONS FOR FIELD CONVERSION
FOR 3 PHASE TO 1 PHASE
1. Remove nuts from all terminals.
2. Remove all pigtail leads and hat shaped buss bar.
3. Remove end of lead wire on terminal 5 and slip onto
terminal 4.
4. Remove lead wire attached to instruction sheet and connect
between terminals 4 and 6.
5. Install hat shaped buss bar between terminals 3 and 5.
6. Place pigtail lead marked “L1” on to terminal 2 and pigtail lead
marked “L2” on to terminal 6.
7. Install nuts and tighten.
8. Connect entrance wiring to pigtail leads “L1” and “L2”. Connect
ground to screw provided.
9. Inspect to make sure wiring is per “Single Phase Wiring”
above.
2
TOP VIEW
SIDE VIEW
Heater
Wall
Wall
Wall
Floor
Ceiling
Chain
3' (914.4mm) Min.
3' (914.4mm) Min.
2' (609.6mm) Min.
10' (3048mm) Min.
ELECTRIC SHOCK HAZARD. Disconnect all power before
installing or servicing heater. Failure to do so could result in
personal injury or property damage. Heater must be effectively
grounded in accordance with the National Electrical Code,
NFPA 70.
All electrical wiring must be done by a qualified person in
accordance with National Electrical Code (NEC) and meet all
state and local regulations.
a
Figure 1
Figure 2
WARNING
!