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36
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
9
12
4
8
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