Bryant 542E - Manual (Page 7)

Figure 14—Field Low-Voltage Connections Using Room
Thermostat P/N 34427DP115or P/N 34427DP118
HEAT PUMP
LOW-VOLTAGE
TERMINAL
BOARD
Figure 15—Field Low-Voltage Connections Using Room Thermostat P/N 34427DP87
Mount the room thermostat on an inside wall in the space to
be conditioned. The thermostat should be approximately 4 or
5 feet above the floor and located where it will not be sub­
jected to either a cooling or heating source, or direct ex­
posure to sunlight.
Use No. 18 AWG “color-coded” insulated wires to make the
low-voltage connections between the thermostat and the
unit. If the thermostat is located more than 100 feet from
the unit as measured along the low-voltage wires, use No. 16
AWG wire.
A grommeted low-voltage inlet hole has been provided in the
control panel adjacent to the control access panel. See
Figure 3 or 4. Run the low-voltage thermostat leads thru the
inlet hole and to the low-voltage terminal board. See Figure
12. Complete the low-voltage thermostat connections as
shown in Figure 14 or 15, depending on which recommended
room thermostat is being used.
C. Heat Anticipator Settings
The recommended room thermostats have a fixed heat antic­
ipator for heat pump heating. When using an accessory
electric heater to provide supplemental heat and emergency
heat capability for the system, see the Installation Instruc­
tions packaged with the heater for setting the adjustable
second-stage heat anticipator.
V. PREPARING UNIT FOR STARTUP
WARNING/DANGER:
A failure to Inllow the-e in.struclion.'
could roiult in seiiou.-< person;.I injury:
1. Follow recognized safety practice.- and wear protective
goggles when checking or .servicing the refrigerant
2. Do not oper.ali' the compres.=or or pro\ ide any electric
power to thi- unil unles.s compre-.'or tormin.il co\ or i.- in
place and secured.
0. Do not rerno\e the compres.-or terminal cu\er iinli! all
electrical source- lia\e been di.sronnected.
1. If a rcl'ngeranl leak is su.-pi'Cted ,iround the com)!re.--or
terminals, relie\e all pres-utv from the -v-tem before
touching or di-ttirliing anything inside the tciminal
■7). .Sy-tem contani.- ml :ind refri.ger.int under pre.-.-tire. De
not use a torch to remove any component To remote a
component, wear protective goggles and [U'oceed as fol-
a. Shut oil electrical power to unit.
li. Reliete all pressure from sy-tem.
c. (7ut component connectin.g tubing with tubing ciit-
ti'i- and remove component from unit.
d. When nece.ssary. un.-weat remaining tubing -tubs
carefully. Oil may ignite when exposed to torch
ÎiisilïiïiSilSijîliSîiiïiiliillS^^
Proceed as follows to prepare the unit for initial startup:
1. Read and follow instructions on all WARNING, CAU­
TION, and INFORMATION labels attached to the unit;
for example, blower rotation labels etc.
2. Visually inspect for oil at all refrigerant tubing connec­
tions and on unit base. Detecting oil generally indicates
a refrigerant leak. Leak-test all refrigerant tubing con­
nections, using electronic leak detector, halide torch, or
liquid-soap solution. If refrigerant leak is detected, see
Section VI, “Refrigerant Leaks,” in these instructions.
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