York H1DS048 Installation Instruction page 9

SYSTEM START-UP
ENERGIZE CRANKCASE HEATER
This unit is equipped with crankcase heaters for both the lead
and follower compressors. The operation of the crankcase
heater is monitored by means of the control board.
CAUTION: An attempt to start the compressor without at least
8 hours of crankcase heat will damage the com-
pressor.
A warning label with an adhesive back is supplied in the unit
installation instruction packet. This label should be attached to
the field supplied disconnect switch where it will be easily seen.
See below.
IMPORTANT
IF POWER HAS BEEN OFF FOR 8 HOURS OR LONGER,
DISCONNECT SWITCH MUST BE TURNED ON 8 HOURS
BEFORE THERMOSTAT IS SET TO "HEAT","COOL" OR
"AUTO"
035-03095.
In order to energize the crankcase heater:
- Set indoor two stage cooling thermostat to "OFF" position.
- Close the line power disconnect to the unit.
CHECKING SYSTEM CHARGE
The factory charge in the outdoor unit is listed in the Table 5 as
well as unit nameplate and includes enough charge for the unit
and the corresponding indoor evaporator coil. This unit in-
cludes sufficient charge for 15 feet of line sets. Table 6 lists the
refrigerant line charges for additional lengths.
CAUTION: REFRIGERANT CHARGING SHOULD ONLY BE
CARRIED OUT BY A QUALIFIED AIR CONDI-
TIONING CONTRACTOR.
TABLE 4 - SUB-COOLING CHART
Required Subcooling Temp. ° F
LIQUID
PRESSURE
5
(PSIG) @
Liquid Line Temperature ° F
SERVICE
PORT
139 73
146 76
153 79
161 82
166 85
179 89
187 92
196 95
202 97
208 99
220 103
229 106
236 108
246 111
256 114
Central Environmental Systems
10 12 15
68 66 63
71 69 66
73 71 68
77 75 72
90 88 85
84 82 79
87 85 82
90 88 85
92 90 87
94 92 89
98 96 93
101 99 96
103 101 98
106 104 101
109 107 104
In order to check whether the unit has the required charge in
the system, follow the procedure described below.
WARNING:DO NOT VENT REFRIGERANT TO THE ATMOS-
PHERE. IT IS NECESSARY TO RECOVER THE
REFRIGERANT DURING ANY REPAIR OR IN-
STALLATION OF THE SYSTEM.
1. Set room thermostat at desired temperature. The thermo-
stat may be energized at first (Y1) stage or second (Y2)
stage. If only the first stage (Y1) is energized, only the lead
compressor will be in operation. Both the compressors will
be in operation if the second stage of thermostat (Y2) is
energized.
Set room thermostat at "COOL" position and fan switch at
"AUTO" or "FAN" position. There is a five minute delay
when the "system control board" is powered for the first
time. Refer to "System Functions" for more information
about time delays.
2. Operate the unit for a minimum of 15-20 minutes before
checking the charge.
3. Verify the desired indoor air handler air flow (CFM).
4. The system charge should be varified with only the lead
compressor running, however it can be also checked with
both the compressors running at the same time at the rated
indoor air handler air flow. However, it is required to estab-
lish the subcooling level at any one condition i.e. either with
the lead compressor running or when both (the lead and
follower) compressors are running.Recommended sub-
cooling temperature is listed in Table 3.
TABLE 3 - RECOMMENDED SUBCOOLING
MODEL
H1DS036
H1DS048
H1DS060
*Lead compressor is designated / labeled as the # 1 com-
pressor. Follower compressor is the # 2 compressor.
LIQUID
PRESSURE
20 5
(PSIG) @
SERVICE
PORT
58 264 116
61 271 117
63 276 120
67 285 122
80 301 126
74 309 127
77 317 130
80 325 132
82 333 134
84 342 136
88 350 138
91 359 140
93 368 142
96 377 144
99 386 146
RECOMMENDED SUBCOOLING °F
LEAD LEAD + FOLLOWER*
COMPRESSOR (BOTH)
ONLY COMPR. RUNNING
10
10
10
Required Subcooling Temp. ° F
10 12 15
Liquid Line Temperature ° F
111 109 106
112 110 107
115 113 110
117 115 112
121 119 116
122 120 117
125 123 120
127 125 122
129 127 124
131 129 126
133 131 128
135 133 130
137 135 132
139 137 134
141 139 136
550.37-N1Y
18
18
18
20
101
102
105
107
111
112
115
117
119
121
123
125
127
129
131
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