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5322625-UIM-A-0417
10
Johnson Controls Unitary Products
COMPRESSORS
The compressor used in this product is specifically designed to operate
with R-410A Refrigerant and cannot be interchanged.
The compressor uses polyolester (POE oil), Mobile 3MA POE. This oil
is extremely hydroscopic, meaning it absorbs water readily. POE oil can
absorb 15 times as much water as other oils designed for HCFC and
CFC refrigerants. If refrigerant circuit is opened, take all necessary pre-
cautions to avoid exposure of the oil to the atmosphere.
POE (polyolester) compressor lubricants are known to cause long term
damage to some synthetic roofing materials.
Procedures which risk oil leakage include, but are not limited to, com-
pressor replacement, repairing refrigerant leaks, replacing refrigerant
components such as filter drier, pressure switch, metering device or
coil.
Units are shipped with compressor mountings which are factory-
adjusted and ready for operation.
GAS HEAT
These two stage gas-fired heaters have direct spark ignition.
GAS PIPING
Proper sizing of gas piping depends on the cubic feet per hour of gas
flow required, specific gravity of the gas and the length of run. National
Fuel Gas Code Z223.1 or CSA B149.1 should be followed in all cases
unless superseded by local codes or gas company requirements. Refer
to Tables 7 and 8.
The BTU content of the gas may differ with locality. The value should be
checked with the local gas utility.
GAS CONNECTION
The gas supply line should be routed through the 1-5/8” hole located on
the right side of the unit. See Figure 3 for the location. The unit is sup-
plied with a rubber grommet that fits in this hole and is used to seal
around the gas pipe. THIS GROMMET MUST BE INSTALLED IN
ORDER TO PREVENT LEAKAGE OF AIR AND WATER INTO THE
HEATING/CONTROLS COMPARTMENT.
Gas piping requirements:
1.
A drip leg and a ground joint union must be installed in the gas pip-
ing.
2.
When required by local codes, a manual shut-off valve may have to
be installed outside of the unit.
3.
Use wrought iron or steel pipe for all gas lines. Pipe thread sealant
should be applied sparingly to male threads only.
MODELS:
PHG4A24
PHG4A30
PHG4B36
PHG4B42
PHG4B48
PHG4B60
NOMINAL TONNAGE:
2.0
2.5
3.0
3.5
4.0
5.0
COMPONENT
Direct Drive Indoor Fan Data
Fan Size (Inch)
11 x 8
11 x 8
11 x 10
11 x 10
11 x 10
11 x 10
Type
Centrifugal
Centrifugal
Centrifugal
Centrifugal
Centrifugal
Centrifugal
Motor HP each
1/3
1/2
1/3
1/2
1/2
3/4
3/4
3/4
1
RPM
1200 Max
1200 Max
1200 Max
1200 Max
1200 Max
1200 Max
Frame size
48
48
48
48
48
48
Filters
Filter Size
A
A
B
B
B
B
Quantity - Size
Field-supplied external filters must be sized so as not to exceed 300 fpm air velocity through disposable filters. For
internal filter use, a filter rack kit is available. Consult the instructions supplied with that kit for replacement filter sizes.
Filter sizes: A=20x10 (2 each), B=20x10 (3 each).
Table 6:
Physical Data (Continued)
CAUTION
This system uses R-410A Refrigerant which operates at higher pres-
sures than R-22. No other refrigerant may be used in this system.
CAUTION
Do not leave the system open to the atmosphere. Unit damage could
occur due to moisture being absorbed by the POE oil in the system.
This type of oil is highly susceptible to moisture absorption
CAUTION
Exposure, even if immediately cleaned up, may cause embrittlement
(leading to cracking) to occur in one year or more. When performing
any service that may risk exposure of compressor oil to the roof, take
precautions to protect roofing.
CAUTION
Do not loosen compressor mounting bolts.
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NOTICE
There may be a local gas utility requirement specifying a minimum
diameter for gas piping. All units require a 1/2 inch pipe connection at
the gas valve.
Table 7:
Natural Gas Pipe Sizing Chart
1
1. Maximum capacity of pipe in cubic feet of gas per hour (based upon a pres-
sure drop of 0.3 inch water column and 0.6 specific gravity gas).
Length
In Feet
Nominal Inches Iron Pipe Size
1/2”
3/4”
1”
1-1/4”
10
132
278
520
1,050
20
92
190
350
730
30
73
152
285
590
40
63
130
245
500
50
56
115
215
440
60
50
105
195
400
70
46
96
180
370
80
43
90
170
350
90
40
84
160
320
100
38
79
150
305