34
AIR COIL
To obtain maximum performance, the air coil should be cleaned
before starting the unit. A 10% solution of dishwasher detergent
and water is recommended for both sides of the coil. Rinse thor
-
oughly with water.
FIELD SELECTABLE INPUTS
Jumpers and DIP (dual in-line package) switches on the control
board are used to customize unit operation and can be configured
in the field.
START-UP
Use the procedure outlined below to initiate proper unit start-up.
NOTE: This equipment is designed for indoor installation only.
Operating Limits
ENVIRONMENT
This equipment is designed for indoor installation ONLY. Extreme
variations in temperature, humidity and corrosive water or air will
adversely affect the unit performance, reliability and service life.
POWER SUPPLY
A voltage variation of ± 10% of nameplate utilization voltage is
acceptable.
UNIT STARTING CONDITIONS
All units start and operate in an ambient of 45°F with entering air
at 40°F, entering water at 20°F and with both air and water at the
flow rates used.
NOTE: These operating conditions are not normal or continuous
operating conditions. It is assumed that such a start-up is for the
purpose of bringing the building space up to occupancy
temperature.
Start Up System
1. Set the thermostat to the highest setting.
2. Set the thermostat system switch to "COOL," and the fan
switch to the "AUTO" position. The reversing valve sole
-
noid should energize. The compressor and fan should not
run.
3. Reduce the thermostat setting approximately 5 degrees
below the room temperature.
4. Verify the heat pump is operating in the cooling mode.
5. Turn the thermostat system switch to the "OFF" position.
The unit should stop running and the reversing valve
should de-energize.
6. Leave the unit off for approximately (5) minutes to allow
for system equalization.
7. Turn the thermostat to the lowest setting.
8. Set the thermostat switch to "HEAT."
9. Increase the thermostat setting approximately 5 degrees
above the room temperature.
10. Verify the heat pump is operating in the heating mode.
11. Set the thermostat to maintain the desired space temperature.
12. Check for vibrations, leaks, etc.
13. Instruct the owner on the unit and thermostat operation.
NOTE: Three factors determine the operating limits of a
unit: (1) entering-air temperature, (2) water temperature and
(3) ambient temperature. Whenever any of these factors are at a
minimum or maximum level, the other two factors must be at a
normal level to ensure proper unit operation. See Table 5.
Table 5 —
50HQP,VQP Unit Operating Limits
LEGEND
*With antifreeze, optional extended range insulation and low temperature cutout
jumper clipped for antifreeze.
Scroll Compressor Rotation
It is important to be certain compressor is rotating in the proper
direction. To determine whether compressor is rotating in the
proper direction:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge
pressure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pressure
does not rise to normal levels:
1. Turn off power to the unit. Install disconnect tag.
2. Reverse any two of the unit power leads.
3. Reapply power to the unit and verify pressures are correct.
The suction and discharge pressure levels should now move to
their normal start-up levels. See Table 6.
When the compressor is rotating in the wrong direction, the unit
makes an elevated level of noise and does not provide cooling.
After a few minutes of reverse operation, the scroll compressor in
-
ternal overload protection will open, thus activating the unit lock
-
out. This requires a manual reset. To reset, turn the thermostat on
and then off.
NOTE: There is a 5-minute time delay before the compressor will
start.
IMPORTANT: Jumpers and DIP switches should only be
clipped when power to control board has been turned off.
CAUTION
To avoid equipment damage, DO NOT leave system filled in a
building without heat during the winter unless antifreeze is
added to system water. Condenser coils never fully drain by
themselves and will freeze unless winterized with antifreeze.
WARNING
When the disconnect switch is closed, high voltage is pres
-
ent in some areas of the electrical panel. Exercise caution
when working with the energized equipment. Electrical
shock can cause personal injury or death.
CONDITION
STANDARD
RANGE UNIT (F)
EXTENDED
RANGE UNIT (F)
Cooling Minimum Entering Air
Temperature (db/wb)
68/57
68/57
Cooling Minimum Entering Water
Temperature
50
50
Cooling Maximum Entering Air
Temperature (db/wb)
95/85
95/85
Cooling Maximum Entering Water
Temperature
110
110
Heating Minimum Entering Air
Temperature
50
50
Heating Minimum Entering Water
Temperature
50
20*
Heating Maximum Entering Air
Temperature
80
80
Normal Water Coil Entering Fluid
Range
50-80
25-80
db —
Dry Bulb
wb —
Wet Bulb
Summary of Contents for Aquazone 50HQP 072
Page 23: ...23 Fig 20 Single Phase with WSHP Open ...
Page 26: ...26 Fig 23 3 Phase with WSHP Open ...
Page 28: ...28 Fig 25 3 Phase Deluxe D Control Package with 1 Speed VFD and Hot Gas Reheat ...
Page 29: ...29 Fig 26 3 Phase with WSHP Open Hot Gas Reheat Water Economizer and SAVTM ...
Page 31: ...31 Fig 28 WSHP Open W2A Wiring Diagram ...
