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Table 17-
HWR Operating Modes
MODE
No Demand
Fan Only
Cooling Stage 1
Cooling Stage 2
Cooling and Dehumidistatt
Dehumidistat
Only
Heating Stage 1
Heating Stage 2
Heating and Dehumidistat**
INPUT
OUTPUT
O
G
Y1
Y2*
H
O
G
Y1
On/Off
Off
Off
Off
Off
On/Off
Off
Off
On/Off
On
Off
Off
Off
On/Off
On
Off
On
On
On
Off
Off
On
On
On
On
On
On
On
Off
On
On
On
On
On
On
On/Off
On
On
On
On
On/Off
Off
Off
Off
On
On
On
On
Off
On
On
Off
Off
Off
On
On
Off
On
On
On
Off
Off
On
On
Off
On
On
On/Off
On
Off
On
On
*Not applicable for single stage units; Full load operation for dual capacity units.
1-Cooling input takes priority over dehumidify
input.
**Deluxe D is programmed
to ignore the H demand when the unit
NOTE: On/Off is either on or off.
is in heating mode.
Y2*
off
off
off
On
On/Off
On
Off
On
On/Off
Reheat
Off
Off
Off
Off
Off
On
Off
Off
Off
Water Out
(To Water Loop)
Water In
(From Water Loop)
NOTE: All components
shown are
internal to the heat pump unit.
Mixing
Valve
Internal
Pump
U
1
Refrigerant Out
(Cooling)
Refrigerant
In [
(Cooling)
71
I
I
COAX
Entering Air ._
Evaporator
Coil
.,11
Fig. 36 -- HWR Schematic
Leaving
Air
Reheat
Coil
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,
humidi-
ty
and corrosive water or air will adversely affect the unit per-
formance, reliability
and service life.
POWER
SUPPLY -- A voltage variation
of 4- 10% of name-
plate utilization
voltage is acceptable.
UNIT START1NG CONDITIONS--Units
start and operate
in an ambient temperature
of 45 F with entering-air
tempera-
ture at 50 F, entering-water
temperature
at 60 F and with both
air and water at the flow rates used.
NOTE:
These operating
limits are not normal or continuous
operating
conditions.
Assume
that such a start-up
is for the
purpose of bringing the building space up to occupancy
tem-
perature. See Table 18 for operating
limits.
When
the disconnect
switch
is closed,
high voltage
is
present in some areas of the electrical panel. Exercise
cau-
tion when working with the energized
equipment.
1. Restore power to system.
2. Turn thermostat
fan position to ON. Blower should start.
3. Balance airflow at registers.
4. Adjust all valves to the full open position and turn on the
line power to all heat pump units.
5. Operate
unit in the cooling cycle first, then the heating
cycle. Refer to Table
18 for unit operating
limits. Al-
low 15 minutes
between
cooling
and heating
tests for
pressure
to equalize.
NOTE:
Two factors determine
the operating
limits of a unit:
entering-air
temperature
and water 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 18.
Table 18 n
Operating Limits
--
50PTH,
PTV, PTD Units
AIR LIMITS
Min. Ambient Air
Rated Ambient Air
Max. Ambient Air
Min. Entering Air
Rated Entering Air db/wb
Max. Entering Air db/wb
WATER LIMITS
Min. Entering Water
Normal Entering Water
Max. Entering Water
LEGEND
db
--
Dry Bulb
wb
--
Wet Bulb
COOLING(F)
HEATING(F)
45
40
80
70
100
85
50
40
80/67
70
110/83
80
30
20
50-110
30-70
120
90
NOTE: Value in heating
column
is dry bulb only. Any wet bulb reading is
acceptable.
34
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