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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: B efore p erfor ming any e lect rical
work, tu rn off th e main po wer to th e syste m.
Connection Cable
10mm 40mm
CAUTI ON
Fig.54
CAUTI ONS
Make su re to con nect th e indoo r unit (A ,B, C, D,
E) to the H i and Lo va lve and t ermin als of si gnal
wires (A, B, C, D , E) of out door un it as ide ntifi ed
with their respective matched connection.
Wrong wiring connections may cause some
electrical parts to malfunction.
Minim um norm inal cr oss-s ectio nal are a
of cond uctor s:
Rated cu rrent o f appli ance
(A)
Nomina l cross -sect ional
2
area (mm)
>3 and <6
>6 and <10
>10 and <1 6
>16 and <2 5
0.75
1
1.5
2.5
Screw
Cover
Connective cable
of indoor uni t and
outdoor unit
Connective cable
of indoor unit a nd
outdoor unit
Connective cable
of indoor uni t and
outdoor unit
Connective cable
of indoor uni t and
outdoor unit
Connective cable
of indoor uni t and
outdoor unit
One-two One-three One-four
One-five
POWER
E
E