19
Heat Controller, Inc.
VMH SerieS
Installation Manual
26
ELECTRICAL WORK
Fig.53
1. All wiring must comply with local and
national electrical codes
2. Unit should be grounded in compliance with
local and national electrical codes.
3. Wiring cable size and type must comply
with all applicable local and national codes.
4. Unit must have an individual branch circuit.
5. Do not touch the capacitor, even if you have
disconnected the power. A charge may remain
inside the capacitor or at least 5 minutes.
To reduce the risk of electrical shock, wait 5
minutes before doing any electrical work.
6. Turn off power supply to unit before doing any work
7. Check unit’s labels and data plates for information
regarding voltage, max fuse/HACR circuit breakers,
min. circuit ampacity.
8. Ensure all wiring is completed per the unit’s wiring
diagram. Power is supplied to the outdoor unit. The
indoor unit’s are connected to the outdoor unit
using signal wires.
Connect the cable to the outdoor unit:
1. Remove the electrical control board cover from
the outdoor unit by loosening the appropriate
screws.
2. Connect power wires (L, N, and Ground) to the
unit’s terminal block.
3. Connect the communication cable to each indoor
unit, then to the appropriate terminal block on the
outdoor unit. Ensure that the wiring matches
between indoor and outdoor units.
4. Use the cable clamp on the outdoor unit to
prevent stress on the connections.
5. To prevent water from entering the electrical
components of the unit, form a “p” trap or loop
with the cable.
6. Insulate only unused conductors with PVC
electrical tape and ensure that they do not
touch any electrical or metal parts.
Wiring connection
NOTE: Before performing any electrical
work, turn off the main power to the system.
Connection Cable
10mm
40mm
CAUTION
Fig.54
CAUTIONS
Make sure to connect the indoor unit (A,B, C, D,
E) to the Hi and Lo valve and terminals of signal
wires(A, B, C, D, E) of outdoor unit as identified
with their respective matched connection.
Wrong wiring connections may cause some
electrical parts to malfunction.
Minimum norminal cross-sectional area
of conductors:
Rated current of appliance
(A)
Nominal cross-sectional
2
area (mm )
>3 and <6
>6 and <10
>10 and <16
>16 and <25
0.75
1
1.5
2.5
Screw
Cover
Connective cable
of indoor unit and
outdoor unit
Connective cable
of indoor unit and
outdoor unit
Connective cable
of indoor unit and
outdoor unit
Connective cable
of indoor unit and
outdoor unit
Connective cable
of indoor unit and
outdoor unit
One-two
One-three
One-four
One-five
POWER
E
E