Lochinvar HS 50 Series 100, User'S Information Manual

19

the storage tank. Use a suitable heat transfer compound 
on the probe to ensure an accurate temperature reading.

5.  If desired connect the Building Management System to 

the Master Control Panel using the protocol determined 
at the time of purchase. (we off er TCP and MSTP but this 
MUST be determined prior to building the panel)

6.  Insert the control fuse and power up the Master Control 

Panel. Check the voltage into the terminal block and 
make sure that it is 120V.

7.  Reference page 25 for instructions on how to set up the 

I.P. addresses for the Master Control Panel.

ROTATION DIRECTION

Scroll compressors, like several other types of compressors, 
will only compress in one rotational direction. Direction of 
rotation is not an issue with single-phase compressors since 
they will always start and run in the proper direction. Three-
phase compressors will rotate in either direction depending 
upon phasing of the power to L1, L2 and L3. Since there is a 
50/50 chance of connecting power in such a way as to cause 
rotation in the reverse direction, it is important to include 
notices and instructions in appropriate locations on the 
equipment to ensure proper rotation direction is achieved 
when the system is installed and operated. Observing that 
suction pressure drops and discharge pressure rises when the 
compressor is energized allows verifi cation of proper rotation 
direction. There is no negative impact on durability caused 
by operating three-phase Copeland Scroll™ compressors in 
the reversed direction for a short period of time, (under one 
hour), but oil may be lost. Oil loss can be prevented during 
reverse rotation if the tubing is routed at least 15 cm above the 
compressor. 

After several minutes of operation in reverse, the compressor 
protection system will trip due to high motor temperature. 
The operator will notice a lack of cooling. However, if allowed 
to repeatedly restart and run in reverse without correcting the 
situation, the compressor will be permanently damaged. All 
three-phase Scroll compressors are identically wired internally.

Therefore, once the correct phasing is determined for a 
specifi c system or installation, connecting properly phased 
power leads to the identifi ed compressor terminals will ensure 
proper rotation direction. Compressors ZB56K* to ZB220K*, 
ZS56K* to ZS11M* and ZF24K* to ZF48K* have an electronic 
protection unit (INT69SCY2) that will not let the compressor 
operate if the phasing of the wires is incorrect.

STARTING SOUND

During the very brief start-up, a clicking sound is audible, 
resulting from initial contacting of the spirals and is normal. 
No start assist devices are required for single-phase compressors, 
even if a system uses non-bleed expansion valves. Due to the 
design of the Copeland Scroll, the internal compression components 
always start unloaded even if system pressures are not 

balanced. In addition, since internal compressor pressures are 
always balanced at start-up, low voltage starting characteristics 
are excellent for Copeland Scroll™ compressors. Moreover, if 
low voltage conditions exist at start up, protector trips could 
result.

This start-up refers to several tools and test instruments needed 
to complete the procedure. See Required Tools and Materials 
on page 15.

1.  Ensure the Installation Checklist has been completed.

2.  Ensure the HPWH, storage tank and water system has 

been purged of air and all valves are in the position for 
normal operation.

3.  Turn on power at the circuit breaker or disconnect switch 

serving the HPWH.

If the HPWH does not start immediately:

• 

Wait 5 minutes in case the anti short cycle timer has 
halted operation. This control system feature protects 
the HPWH from rapid short cycling that can cause 
permanent damage to the unit.

• 

Ensure the operating set point on the tank temperature 
control is adjusted high enough to initiate a call for 

heat. The recommended setting is 120°F to 150°F 
(29°C to 66° C).

• 

DO NOT set the operating set point on the tank 
temperature control above 150°F. See Water 
Temperature Range on page 4.

• 

Ensure the Diff erential Set Point is not set too high. 
Higher differential settings will cause greater 
temperature swings in system temperature. Lower 
diff erential settings can cause unit short cycling. The 
recommended setting is 10°F.

• 

If the unit does not start after all of the above procedures 
have been followed. Refer to the troubleshooting 
section of this manual.

4. 

Securely attach surface mount thermometers or temperature 
sensors to the inlet (entering) and outlet (leaving) water 
lines near the HPWH cabinet. If there are thermometers 
installed in the inlet and outlet in close proximity to the 
HPWH water connections they can be used for the following 
check. Ensure the water outlet (supply) and inlet (return) 
valves are fully open. Start the HPWH and allow it to 
operate for 5 minutes. with the HPWH operating record 
the inlet and outlet temperatures.

During normal operation, the outlet line should be 8°F 
to 12°F (4°C to 7°C) hotter than the inlet line. This is the 
temperature rise through the heat exchanger inside the 
HPWH unit. Note: Temperature rise and water fl ow rate 
through the heat exchanger inside the HPWH are 

START UP