Lochinvar HS 50 Series 100, User'S Information Manual

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2.  Heat transfer compound (paste) such as Honeywell part 

number 107408 or equivalent.

3. 

Electrical switch lock out device - used to secure disconnect 
switches/breaker panels while servicing.

4.  Electronic thermometer including:

• 

Four (4) thermocouple sensors capable of measuring 
surface temperatures on water or refrigerant piping 
up to 2 inch diameter.

• 

Two (2) thermocouple sensors capable of measuring 
ambient air temperature.

• 

Temperature range 32°F - 210°F (0°C - 100°C).

5.  Volt-Ohm Multi Meter - capable of measuring:

• 

AC Voltage up to 600 VAC.

• 

DC Voltage up to 24 VDC.

• 

Ohms up to 2,000,000 ohms.

• Continuity.

6.  AC amp meter - capable of measuring:

• 

AC amperage up to 200 amps.

7.  Calculator.    

SERVICE TOOLS

See Qualifications on page 3 regarding regulations and 
certifi cations required under Section 608 of the Clean Air Act 
before servicing the refrigeration circuit.

1.  Refrigeration manifold gauges.

2.  Refrigeration charging scale.

3.  Refrigeration vacuum pump.

4.  Refrigerant recovery machine.

5.  Refrigerant reclamation storage tank.

UNIT PLACEMENT

Whether replacing existing water heating equipment or installing 
the HPWH in new construction, the following critical points 
must be observed: The HPWH unit:

1. 

The HPWH, storage tank and water heater(s) should be located 
in an area where leakage will not result in damage to 
adjacent area or to lower fl oors in the building structure.

2.  The HPWH unit must be level for proper operation. Shim 

the channel type skid base, pad or fl oor as necessary if 
leveling is required.

3.  Should be installed close to the point of major hot water 

usage and power supply.

4.  Should be located so that hot water piping and branch 

circuit wiring will be as short as possible.

MOUNTING FRAME

The mounting frame must support the length, width, and 
weight of the HPWH unit. The weight of the HPWH unit must 

be evenly dispersed across the footing channels on the bottom 
of the unit. See Table 1 on page 7 for unit dimensions and 
weights.

Note:  

A qualified engineer should design and size the 

structural components of the mounting frame and the appropriate 
hangers. Structural channels in a fi eld-provided frame should 
be mounted perpendicular to the unit’s footing channels

. 

The following critical points must be observed when the 
HPWH unit is suspended from the ceiling:

1.  Hanging rods must not obstruct access doors.

2. 

VIBRATION ISOLATORS ARE REQUIRED to prevent transmission 
of mechanical vibration into the building structure. Selection 
of suitable isolators should be made by a qualifi ed engineer.

3. 

Installation must meet local seismic restraint requirements.

PAD MOUNTING

The HPWH may be pad mounted. Vibration isolator mounts 
MUST BE placed between the unit and the equipment pad to 
prevent mechanical vibration transmitting into the building 
structure. Selection of appropriate vibration isolators should 
be made by a qualified engineer. Unit must be level and 
elevated at least 6” above fl oor to avoid dust and debris from 
entering the unit.

ELECTRICAL CONNECTIONS

CORRECT VOLTAGE AND PHASE

The HPWH units covered by this instruction manual can be 
ordered with multiple power supply voltage and phase 
configurations. Ensure the power supply voltage and phase 
at the job site matches the power supply ratings listed on the 
HPWH rating label BEFORE INSTALLATION BEGINS.

Voltage applied to the HPWH should not vary more than +5% 
to -10% of the voltage requirement listed on the HPWH rating 
label for satisfactory operation.

Energizing the HPWH with the wrong voltage and/or phase 
may cause permanent damage to HPWH components. Damage 
resulting from applying the wrong power supply voltage or 
phase to the HPWH is not covered under the limited warranty.

BRANCH CIRCUIT DISCONNECT SWITCH

The power supply wiring and equipment grounding must be 
installed in accordance with local codes or, in the absence of 
local codes, the National Electrical Code, ANSI/NFPA 70 or the 
Canadian Electrical Code, CSA C22.1.

Install an adequately fused disconnect switch as close to the 
units possible. See unit rating label for maximum fuse size 
(MFS). 

Run the power supply lines from the disconnect to the 
control box at the side panel of the unit. Connect the lines to 
the terminals on input side of power distribution block L1 & 
L2 for single phase and L1, L2 & L3 for three phases. Connect 
ground wire to ground lug.