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4. Check the temperature of both supply and discharge
water. Compare to Tables 20-30. If temperature is within
range, proceed. If temperature is outside the range, check
the cooling refrigerant pressures in Tables 20-30.
5. Check air temperature drop across the coil when com-
pressor is operating. Air temperature drop should be
between 15 and 25 F.
Table 19 — Water Temperature Change
through Heat Exchanger
Unit Start-Up Heating Mode
NOTE: Operate the unit in heating cycle after checking the
cooling cycle. Allow 5 minutes between tests for the pressure
or reversing valve to equalize.
1. Turn thermostat to lowest setting and set thermostat
switch to HEAT position.
2. Slowly turn the thermostat to a higher temperature until
the compressor activates.
3. Check for warm air delivery at the unit grille within a few
minutes after the unit has begun to operate.
4. Check the temperature of both supply and discharge
water. Compare to Tables 20-30. If temperature is within
range, proceed. If temperature is outside the range, check
the heating refrigerant pressures in Tables 20-30.
5. Once the unit has begun to run, check for warm air deliv-
ery at the unit grille.
6. Check air temperature rise across the coil when compres-
sor is operating. Air temperature rise should be between
20 and 30 F after 15 minutes at load.
7. Check for vibration, noise and water leaks.
Table 20 — 50PSH, PSV, PSD006 Typical Unit Operating Pressures and Temperatures
LEGEND
Table 21 — 50PSH, PSV, PSD009 Typical Unit Operating Pressures and Temperatures
LEGEND
WATER FLOW RATE (GPM)
COOLING
RISE (F)
HEATING
DROP (F)
Min Max Min Max
For Closed Loop: Ground Source or
Cooling/Boiler Systems at 3 gpm/ton
91248
For Open Loop: Ground Water Systems at
1.5 gpm/ton
20 26 10 17
ENTERING
WATER
TEMP
(F)
WATER
FLOW
(GPM/ton)
FULL LOAD COOLING — WITHOUT HWG ACTIVE FULL LOAD HEATING — WITHOUT HWG ACTIVE
Suction
Pressure
(psig)
Discharge
Pressure
(psig)
Super-
heat
(F)
Sub-
cooling
(F)
Water
Temp
Rise
(F)
Air Temp
Drop
(F) DB
Suction
Pressure
(psig)
Discharge
Pressure
(psig)
Super-
heat
(F)
Sub-
cooling
(F)
Water
Temp
Drop
(F)
Air Temp
Rise
(F) DB
30
1.5 114-124 142-162 24-29 3-8 15.2-17.2 17-23 75-85 272-292 13-18 4- 9 5.9- 7.9 16-22
2.25 111-121 132-152 26-31 3-8 11.4-13.4 17-23 78-88 274-294 13-18 4- 9 4.3- 6.3 16-22
3 109-119 122-142 28-33 3-8 7.5-9.5 17-23 81-91 276-296 13-18 4- 9 2.7- 4.7 17-23
50
1.5 130-140 190-210 14-19 2-7 16.5-18.5 18-24 104-114 299-319 12-17 6-11 8.8-10.8 21-27
2.25 129-139 180-200 16-21 2-7 12.3-14.3 18-24 112-122 304-324 12-17 4- 9 6.7- 8.7 22-28
3 128-138 170-190 19-24 2-7 8.00-10.0 18-24 120-130 308-328 12-17 3- 8 4.5- 6.5 23-29
70
1.5 143-153 265-285 9-14 2-7 15.5-17.5 18-24 129-139 321-341 11-16 7-12 11.2-13.2 25-31
2.25 141-151 252-272 10-15 2-7 11.5-13.5 18-24 144-154 330-350 13-18 4- 9 8.8- 10.8 27-33
3 140-150 240-260 11-16 2-7 7.5-9.5 18-24 159-169 340-360 15-20 3- 8 6.3- 8.3 28-34
90
1.5 149-159 340-370 8-13 2-7 14.2-16.2 17-23 163-173 349-369 13-18 7-12 14.3-16.3 30-36
2.25 149-159 335-355 8-13 2-7 10.6-12.6 17-23 180-190 360-380 11-16 4- 9 11.2-13.2 32-38
3 148-158 320-340 8-13 2-7 7.00-9.00 17-23 198-208 372-392 10-15 3- 8 8.1-10.1 34-40
110
1.5 154-164 451-471 8-13 2-7 12.7-14.7 15-21 — — — — — —
2.25 154-164 428-448 8-13 2-7 9.5-11.5 15-21 — — — — — —
3 153-163 405-425 8-13 2-7 6.5-8.5 15-21 — — — — — —
DB — Dry Bulb
HWG — Hot Water Generator
——No Heating Operation in This Temperature Range
ENTERING
WATER
TEMP
(F)
WATER
FLOW
(GPM/ton)
FULL LOAD COOLING — WITHOUT HWG ACTIVE FULL LOAD HEATING — WITHOUT HWG ACTIVE
Suction
Pressure
(psig)
Discharge
Pressure
(psig)
Super-
heat
(F)
Sub-
cooling
(F)
Water
Temp
Rise
(F)
Air Temp
Drop
(F) DB
Suction
Pressure
(psig)
Discharge
Pressure
(psig)
Super-
heat
(F)
Sub-
cooling
(F)
Water
Temp
Drop
(F)
Air Temp
Rise
(F) DB
30
1.5 126-136 161-181 17-22 8-13 19.8-21.8 21-27 74-84 278-298 6-11 4-9 6.1-8.1 18-24
2.25 126-136 146-166 17-22 7-12 14.9-16.9 21-27 77-87 280-300 6-11 4-9 4.5-6.5 18-24
3 126-136 131-151 17-22 6-11 9.9-11.9 21-27 79-89 283-303 6-11 3-8 2.8-4.8 19-25
50
1.5 132-142 215-235 10-15 8-13 18.8-20.8 20-26 104-114 309-329 8-12 7-12 9.6-11.6 24-30
2.25 132-142 200-220 10-15 7-12 14.1-16.1 20-26 106-116 312-332 8-12 7-12 7.0-9.0 24-30
3 132-142 185-205 10-15 6-11 9.4-11.4 20-26 108-118 315-335 8-12 7-12 4.5-6.5 25-31
70
1.5 138-148 278-298 8-13 9-14 17.7-19.7 19-25 127-137 332-352 10-15 10-15 12.0-14.0 29-35
2.25 138-148 263-283 8-13 8-13 13.1-15.1 19-25 132-142 340-360 11-16 10-15 9.0-10 29-35
3 137-147 248-268 8-13 7-12 8.5-10.5 19-25 138-148 347-367 13-18 10-15 6.1-8.1 30-36
90
1.5 142-152 365-385 8-13 9-14 16.0-18.0 18-24 164-174 372-392 17-22 13-18 14.5-16.5 35-41
2.25 142-152 351-371 8-13 8-13 12.0-14.0 18-24 165-175 375-395 18-23 13-18 11.2-13.2 35-41
3 142-152 337-357 8-13 7-12 8.0-10.0 18-24 167-177 379-399 19-24 13-18 7.9-9.9 36-42
110
1.5 150-160 439-459 7-12 9-14 14.2-16.2 17-23 — — — — — —
2.25 150-160 439-459 7-12 8-13 10.6-12.6 17-23 — — — — — —
3 150-160 439-459 7-12 7-12 6.9-8.9 17-23 — — — — — —
DB — Dry Bulb
HWG — Hot Water Generator
——No Heating Operation in This Temperature Range